Power supply control system and energy storage system

Abstract

The utility model relates to the technical field of power electronics, and discloses a power supply control system and an energy storage system, which are used for setting the standby power time of a battery in the switching process of a direct-current power supply and an alternating-current power supply so as to prevent the battery from being lack of power. The power supply control system comprises a first energy storage cabinet. The first energy storage cabinet comprises a first power supply conversion module and a first power supply control module. The anode output end of the first power conversion module is connected with the anode of the load through the contact of at least one relay; a cathode output end of the first power conversion module is connected with a load cathode; the first power supply control module is used for controlling the conduction duration between the positive pole output end of the first power supply conversion module and the positive pole of the load through the delayed opening or closing of the corresponding contacts of the relays; the first power conversion module is used for converting direct current or alternating current mains supply output by the battery into direct current of target working voltage.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, and in particular to a power supply control system and an energy storage system. Background Art

[0002] With the development of new energy, energy storage systems have been widely used. Energy storage systems have diversified application scenarios, including peak-valley arbitrage, demand management, transformer expansion and other working modes. As an important part of the energy storage system, the energy storage cabinet also needs to ensure the power supply of the control system in the energy storage system. The DC loads in the control system mainly include fire detectors, water immersion sensors, energy management systems (EMS), battery management systems (BMS), etc. Most of these DC loads require uninterruptible power supply.

[0003] The traditional solution uses a dual power switching mode to provide uninterrupted power supply for DC loads. However, in the dual power switching mode, since the depth of discharge (DOD) of the energy storage cabinet battery is generally set relatively high, when the AC power is lost for a long time, the energy storage cabinet battery is required to be used as a DC power supply to power the DC load for a long time, which may cause the battery in the energy storage cabinet to run out of power and reduce the battery life. Utility Model Content

[0004] The utility model provides a power supply control system and an energy storage system, which are used to set the battery backup time during the switching process between a direct current power supply and an alternating current power supply to prevent the battery from running out of power.

[0005] The first aspect of the utility model provides a power control system, which includes a first energy storage cabinet, and the first energy storage cabinet includes: a first power conversion module and a first power control module, the first power control module includes at least one relay; the positive output end of the first power conversion module is connected to the positive pole of the load through the contact of the at least one relay; the negative output end of the first power conversion module is connected to the negative pole of the load; the first power control module is used to control the conduction time between the positive output end of the first power conversion module and the positive pole of the load through the delayed opening or closing of the corresponding contacts of each relay; the first power conversion module has an AC input end and a DC input end, the AC input end is used to connect to the AC mains, and the DC input end is used to connect to the battery, and the first power conversion module is used to convert the DC power output by the battery or the AC mains into DC power of a target working voltage.

[0006] In a feasible embodiment, the first power control module includes a first power-off delay relay and a second power-off delay relay, the contact of the first power-off delay relay is a first delayed disconnection contact, and the contact of the second power-off delay relay is a second delayed disconnection contact; the two ends of the coil in the first power-off delay relay are respectively connected to the two AC input ends of the first power conversion module; the first end of the first delayed disconnection contact is connected to the positive output end of the first power conversion module and the first end of the second delayed disconnection contact, and the second end of the first delayed disconnection contact is connected to the first end of the coil of the second power-off delay relay; the second end of the second delayed disconnection contact is connected to the positive pole of the load, and the second end of the coil of the second power-off delay relay is connected to the negative output end of the first power conversion module and the negative pole of the load.

[0007] In a feasible implementation manner, the first power control module includes a first intermediate relay and a first time relay, the contact of the first intermediate relay is a first normally open contact; the two ends of the coil in the first intermediate relay are respectively connected to the two AC input ends of the first power conversion module; the first time relay includes a first loop input end, a second loop input end, a third loop input end and a first loop output end; the first end of the first normally open contact is connected to the second loop input end and the positive output end of the first power conversion module; the second end of the first normally open contact is connected to the first loop input end; the third loop input end is connected to the negative output end of the first power conversion module and the negative pole of the load, and the first loop output end is connected to the positive pole of the load.

[0008] In a feasible implementation manner, the first power control module includes a battery management system BMS, a first intermediate relay and a second intermediate relay, the contact of the first intermediate relay is a first normally open contact, and the contact of the second intermediate relay is a first normally closed contact; the two endpoints of the coil of the first intermediate relay are respectively connected to the two AC input terminals of the first power conversion module; the two ends of the first normally open contact are connected to the digital input terminals of the BMS; the coil of the second intermediate relay is connected to the high-side digital output terminal of the BMS, and the output voltage of the high-side output terminal is the power supply voltage of the BMS; the first end of the first normally closed contact is connected to the positive output terminal of the first power conversion module, the second end of the first normally closed contact is connected to the positive pole of the load, and the negative pole output terminal of the first power conversion module is connected to the negative pole of the load.

[0009] In a feasible implementation manner, the first power control module includes a battery management system BMS, a DC circuit breaker and a first intermediate relay, the contact of the first intermediate relay is a first normally open contact; the two ends of the coil of the first intermediate relay are respectively connected to the two AC input ends of the first power conversion module; the two ends of the first normally open contact are connected to the digital input ends of the BMS; the positive output end of the first power conversion module is connected to the positive pole of the load after passing through the DC circuit breaker, and the negative output end of the first power conversion module is connected to the negative pole of the load after passing through the DC circuit breaker.

[0010] In a feasible embodiment, the first power conversion module includes a working voltage protection unit, and the working voltage protection unit is used to stop outputting DC power when the input voltage of the two DC input terminals in the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than the undervoltage protection value of the battery.

[0011] In a feasible implementation manner, a self-locking button is provided on the loop where the positive output terminal of the first power conversion module is located, and the self-locking button is used to provide a black start function and an emergency shutdown function.

[0012] In a feasible embodiment, the power control system also includes a backup power supply, and the first energy storage cabinet also includes: a first diode module and a second power control module: the positive output end of the first power conversion module is connected to the first input end of the first diode module through the contact of the at least one relay; the second input end of the first diode module is connected to the positive output end of the second power control module, and the output end of the first diode module is connected to the positive pole of the load; the negative output end of the first power conversion module is connected to the negative output end of the second power control module and the negative pole of the load; the first power control module is used to control the conduction time between the positive output end of the first power conversion module and the positive pole of the load by delaying the opening or closing of the corresponding contacts of each relay; the second power control module is used to control the conduction time between the positive output end of the backup power supply and the positive pole of the load by delaying the opening or closing of the corresponding contacts of each relay; the first diode module is used to provide the direct current output by the first power conversion module, or the direct current output by the backup power supply to the positive pole of the load.

[0013] In a feasible implementation manner, the first power supply control module includes a first power-off delay relay, the contact of the first power-off delay relay is a first delayed disconnection contact, the second power supply control module includes an energy storage capacitor, a first power-on delay relay and a first intermediate relay, the contact of the first power-on delay relay is a first delayed disconnection contact, and the contact of the first intermediate relay is a first normally closed contact; the two ends of the coil in the first power-off delay relay are respectively connected to the two AC input ends of the first power conversion module; the first end of the first delayed disconnection contact is connected to the positive output end of the first power conversion module, and the second end of the first delayed disconnection contact is connected to the positive output end of the first power conversion module. The first end is connected to the first end of the coil of the first intermediate relay, the first end of the energy storage capacitor, and the first input end of the first diode module; the negative output end of the first power conversion module is connected to the negative output end of the backup power supply, the second end of the first intermediate relay, the second end of the energy storage capacitor, the second end of the coil of the first power-on delay relay, and the negative pole of the load; the first end of the coil in the first power-on delay relay is connected to the second end of the first normally closed contact and the first end of the first delayed disconnecting break contact; the second end of the first delayed disconnecting break contact is connected to the second input end of the first diode module; the first end of the first normally closed contact is connected to the positive output end of the backup power supply.

[0014] In a feasible implementation manner, the first power supply control module includes a first power-off delay relay and a second power-off delay relay, the contact of the first power-off delay relay is a first delayed disconnection contact, and the contact of the second power-off delay relay is a second delayed disconnection contact; the second power supply control module includes a first solid-state relay, and the contact of the first solid-state relay is a first normally closed contact; the two ends of the coil in the first power-off delay relay are respectively connected to the two AC input ends of the first power conversion module; the first end of the first delayed disconnection contact is connected to the positive output end of the first power conversion module and the first end of the second delayed disconnection contact is connected to the positive output end of the first power conversion module. The second end of the first delayed opening make contact is connected to the first end of the coil of the second power-off delay relay; the second end of the second delayed opening make contact is connected to the first end of the coil of the first solid-state relay, the first input end of the first diode module, and the normally closed contact of the backup power supply; the negative output end of the first power conversion module, the second end of the coil of the second power-off delay relay, the second end of the coil of the first solid-state relay, the negative output end of the backup power supply, and the negative pole of the load are connected; the second input end of the first diode module is connected to the positive output end of the backup power supply through the first normally closed contact, and the output end of the first diode module is connected to the positive pole of the load.

[0015] In a feasible implementation manner, the first power control module includes a first intermediate relay and a first time relay, and the contact of the first intermediate relay is a first normally open contact; the second power control module includes a first solid-state relay, and the contact of the first solid-state relay is a first normally closed contact; the two ends of the coil in the first intermediate relay are respectively connected to the two AC input ends of the first power conversion module; the first time relay includes a first loop input end, a second loop input end, a third loop input end and a first loop output end; the first end of the first normally open contact is connected to the second loop input end and the positive output end of the first power conversion module; the second end of the first normally open contact is connected to the first loop input end; the third loop input end is connected to the negative output end of the first power conversion module, the negative output end of the backup power supply, and the negative pole of the load; the first loop output end is connected to the first end of the coil of the first solid-state relay and the first input end of the first diode module; the second input end of the first diode module is connected to the positive output end of the backup power supply through the first normally closed contact, and the output end of the first diode module is connected to the positive pole of the load.

[0016] In a feasible implementation manner, the first power control module includes a battery management system BMS, a first intermediate relay and a second intermediate relay, the contact of the first intermediate relay is a first normally open contact, and the contact of the second intermediate relay is a first normally closed contact; the second power control module includes a first solid-state relay, and the contact of the first solid-state relay is a second normally closed contact; the two ends of the coil in the first intermediate relay are respectively connected to the two AC input ends of the first power conversion module; the two ends of the first normally open contact are connected to the digital input end of the BMS; the coil of the second intermediate relay is connected to the high-side digital output end of the BMS , the output voltage of the high-side output end is the power supply voltage of the BMS; the first end of the first normally closed contact is connected to the positive output end of the first power conversion module, and the second end of the first normally closed contact is connected to the first end of the coil of the first solid-state relay, the first input end of the first diode module, and the positive output end of the backup power supply; the negative output end of the first power conversion module is connected to the second end of the coil in the first solid-state relay, the negative output end of the backup power supply, and the negative pole of the load; the second input end of the first diode module is connected to the positive output end of the backup power supply through the second normally closed contact, and the output end of the first diode module is connected to the positive pole of the load.

[0017] In a feasible implementation manner, the first power control module includes a battery management system BM, a first intermediate relay and a DC circuit breaker, the contact of the first intermediate relay is a first normally open contact; the second power control module includes a first solid-state relay, the contact of the first solid-state relay is a first normally closed contact; the two ends of the coil in the first intermediate relay are respectively connected to the two AC input ends of the first power conversion module; the two ends of the first normally open contact are connected to the digital input end of the BMS; the positive output end of the first power conversion module is connected to the first end of the coil of the first solid-state relay, the first input end of the first diode module, and the positive output end of the backup power supply after passing through the DC circuit breaker; the negative output end of the first power conversion module is connected to the second end of the coil of the first solid-state relay, the negative output end of the backup power supply, and the negative pole of the load after passing through the DC circuit breaker; the second input end of the first diode module is connected to the positive output end of the backup power supply through the first normally closed contact, and the output end of the first diode module is connected to the positive pole of the load.

[0018] In a feasible implementation manner, the backup power supply of the first energy storage cabinet is the second energy storage cabinet, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the second energy storage cabinet comprises: a second power conversion module, a third power control module, a fourth power control module and a second diode module, the third power control module comprises at least one relay, and the fourth power control module comprises at least one relay; the positive output end of the second power conversion module is connected to the first input end of the second diode module through the contact of the at least one relay; the second input end of the second diode module is connected to the positive output end of the fourth power control module, and the output end of the second diode module is connected to the positive pole of the load; the negative output end of the second power conversion module is connected to the negative output end of the fourth power control module, the load negative electrode connection; the third power control module is used to control the conduction time between the positive output terminal of the second power conversion module and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay; the fourth power control module is used to control the conduction time between the positive output terminal of the first energy storage cabinet and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay; the second diode module is used to provide the direct current output by the second power conversion module, or the direct current output by the first energy storage cabinet to the positive electrode of the load; the second power conversion module has an AC input terminal and a DC input terminal, the AC input terminal is used to connect to the AC mains, and the DC input terminal is used to connect to the battery, and the second power conversion module is used to convert the DC power output by the battery or the AC mains into DC power of the target working voltage.

[0019] The second aspect of the utility model provides an energy storage system, comprising a plurality of power control systems and an energy management system according to any one of the embodiments of the first aspect above, wherein the energy management system is used to perform energy management on batteries of each energy storage cabinet in the power control system.

[0020] In the technical solution provided by the utility model, the power control system includes a first energy storage cabinet, the first energy storage cabinet includes: a first power conversion module and a first power control module, the first power control module includes at least one relay; the positive output terminal of the first power conversion module is connected to the positive pole of the load through the contact of at least one relay; the negative output terminal of the first power conversion module is connected to the negative pole of the load; the first power control module is used to control the conduction time between the positive output terminal of the first power conversion module and the positive pole of the load through the delayed disconnection or closing of the corresponding contacts of each relay; the first power conversion module has an AC input terminal and a DC input terminal, the AC input terminal is connected to the AC mains, and the DC input terminal is connected to the battery, and the first power conversion module is used to convert the DC power output by the battery or the AC mains into DC power of the target working voltage. In the utility model, during the switching process between the DC power supply and the AC power supply, the battery backup time is set by delaying the disconnection or closing of the relay contacts, and the battery is controlled to supply power to the load to prevent the battery from being depleted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a power supply control system in an embodiment of the utility model;

[0022] Figure 2 Another schematic diagram of a power supply control system in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the structure of a power supply control system in an embodiment of the utility model;

[0024] Figure 4 Another structural schematic diagram of a power supply control system in an embodiment of the utility model;

[0025] Figure 5 Another structural schematic diagram of a power supply control system in an embodiment of the utility model;

[0026] Figure 6 Another structural schematic diagram of a power supply control system in an embodiment of the utility model;

[0027] Figure 7 Another structural schematic diagram of the power supply control system in the embodiment of the utility model;

[0028] Figure 8 A schematic diagram of a connection relationship between the first energy storage cabinet and the second energy storage cabinet in an embodiment of the utility model;

[0029] Fig. 9 This is another structural schematic diagram of the power supply control system in the embodiment of the utility model.

[0030] Fig.10 This is another schematic diagram of the connection relationship between the first energy storage cabinet and the second energy storage cabinet in the embodiment of the utility model;

[0031] Fig.11 Another structural schematic diagram of a power supply control system in an embodiment of the utility model;

[0032] Fig.12 This is another schematic diagram of the connection relationship between the first energy storage cabinet and the second energy storage cabinet in the embodiment of the utility model;

[0033] Fig.13 Another structural schematic diagram of a power supply control system in an embodiment of the utility model;

[0034] Fig.14 This is another schematic diagram of the connection relationship between the first energy storage cabinet and the second energy storage cabinet in the embodiment of the utility model;

[0035] Fig.15 Another structural schematic diagram of a power supply control system in an embodiment of the utility model;

[0036] Fig.16 This is a schematic diagram of another connection relationship between the first energy storage cabinet and the second energy storage cabinet in an embodiment of the utility model. DETAILED DESCRIPTION

[0037] The utility model provides a power supply control system and an energy storage system, which are used to set the battery backup time during the switching process between a direct current power supply and an alternating current power supply to prevent the battery from running out of power.

[0038] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here, for example, can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] like Figure 1As shown, an embodiment of the utility model provides a power supply control system, the power supply control system includes a first energy storage cabinet, and the first energy storage cabinet specifically includes:

[0040] A first power conversion module 110 and a first power control module 120, wherein the first power control module 120 includes at least one relay;

[0041] The positive output terminal of the first power conversion module 110 is connected to the positive electrode of the load through the contact of the at least one relay;

[0042] The negative output terminal of the first power conversion module 110 is connected to the negative electrode of the load;

[0043] The first power control module 120 is used to control the conduction time between the positive output terminal of the first power conversion module and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay;

[0044] The first power conversion module 110 has an AC input terminal and a DC input terminal. The AC input terminal is used to connect to the AC mains, and the DC input terminal is used to connect to the battery. The first power conversion module 110 is used to convert the DC power output by the battery or the AC mains into DC power of a target working voltage.

[0045] Among them, the battery connected to the DC input terminal can be arranged inside the energy storage cabinet or outside the energy storage cabinet. For multiple energy storage cabinets, some batteries can be arranged inside the energy storage cabinet and some batteries can be arranged outside the energy storage cabinet at the same time. The present application does not limit this. For ease of understanding, in this embodiment and subsequent embodiments, the battery is arranged in the energy storage cabinet as an example, that is, the battery of the first energy storage cabinet is arranged inside the first energy storage cabinet, and the battery of the second energy storage cabinet is arranged inside the second energy storage cabinet.

[0046] The utility model sets the battery backup time by delaying the opening or closing of the relay contacts during the switching process between the DC power supply and the AC power supply, and controls the duration for which the battery in the first energy storage cabinet supplies power to the load. This can not only realize uninterrupted switching of the load power supply and meet the backup time requirement, but also automatically set the battery backup time to prevent the battery from running out of power and prolong the battery life.

[0047] It is understandable that at least one relay can select a relay model with a delay function or control the signal sending time through the battery management system BMS to achieve the delay function, thereby controlling the length of time the first power conversion module supplies power to the load, avoiding the power supply battery from running out of power and affecting the battery life.

[0048] In a possible implementation, Figure 2As shown, the first power supply control module includes a first power-off delay relay KT1 and a second power-off delay relay KT2, the contact of the first power-off delay relay KT1 is a first delayed opening and closing contact KT1-1, and the contact of the second power-off delay relay KT2 is a second delayed opening and closing contact KT2-1;

[0049] The two ends of the coil in the first power-off delay relay KT1 are respectively connected to the two AC input ends of the first power conversion module;

[0050] The first end of the first delayed disconnecting make contact KT1-1 is connected to the positive output end of the first power conversion module and the first end of the second delayed disconnecting make contact KT2-1, and the second end of the first delayed disconnecting make contact KT1-1 is connected to the first end of the coil of the second power-off delay relay KT2;

[0051] The second end of the second delayed opening make contact KT2-1 is connected to the positive pole of the load, and the second end of the coil of the second power-off delay relay KT2 is connected to the negative output end of the first power conversion module and the negative pole of the load.

[0052] Among them, the first power conversion module SP1 is a switching module with both AC / DC and DC / DC functions, with two AC input terminals and two DC input terminals. The AC mains is connected to the AC input terminal (AC / DC terminal) of the first power conversion module SP1, and the battery of the DC power supply is connected to the DC input terminal (DC / DC terminal) of the first power conversion module SP1. SP automatically realizes priority AC power supply.

[0053] For example, Figure 2As shown, the AC mains and the battery of the first energy storage cabinet are simultaneously connected to the first power conversion module SP1. Under the action of the target working voltage, the coil of the first power-off delay relay KT1 is energized, and the first delayed disconnection contact KT1-1 corresponding to the first power-off delay relay KT1 is closed, so that the second power-off delay relay KT2 is energized, and the second delayed disconnection contact KT2-1 is closed, and the AC mains supplies the DC load. When the AC mains loses power, the coil of the first power-off delay relay KT1 loses power, and the first delayed disconnection contact KT1-1 corresponding to KT1 is delayed to disconnect. The delay time corresponding to KT1 can be set according to demand, and disconnected after reaching the preset timing time, then the second power-off delay relay KT2 loses power, and the second delayed disconnection contact KT2-1 is delayed to disconnect, thereby controlling the power supply time of the DC power supply, and the delay time corresponding to the contact of KT2 can be set according to actual demand, and disconnected after reaching the preset timing time, so as to realize the control of the battery backup time and prevent the battery from running out of power. If the AC mains power is restored during the battery power supply delay process, the coil of the first power-off delay relay KT1 is energized, the first delayed disconnection contact KT1-1 is closed, and then the coil of the second power-off delay relay KT2 is energized, and the second delayed disconnection contact KT2-1 is closed. At this time, the load is switched to AC mains power supply. When the AC power supply fails next time, the first power-off delay relay KT1 and the second power-off delay relay KT2 will restart the timing delay disconnection, and the cycle will repeat automatically. Among them, the above-mentioned time relay can be replaced by a solid-state relay or an intermediate relay to achieve the same function, which will not be described in detail here.

[0054] Optionally, the first power conversion module further includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the battery.

[0055] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0056] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0057] like Figure 2 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0058] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements, such as Figure 2 As shown in the figure, the number of the first delayed opening and closing contacts KT1-1 of KT1 is one, and it can also be drawn as two or more in parallel. The number of the second delayed opening and closing contacts KT2-1 of KT2 is one, and it can also be drawn as two or more in parallel. The contacts drawn in the accompanying drawings do not represent a limitation on the number of contacts, and can be selected according to actual needs, and there is no limitation on the specific number.

[0059] It is understandable that the first power conversion module also needs to be grounded, such as Figure 2 The first power conversion module shown is also connected to a PE line. In this embodiment and subsequent embodiments, the first power conversion module needs to be grounded, which will not be described further.

[0060] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery of the first energy storage cabinet is set, which solves the problem of the battery of the first energy storage cabinet running low and improves the reliability of the power control system.

[0061] In a possible implementation, Figure 3 As shown, the first power supply control module includes a first intermediate relay KM1 and a first time relay KT1, and the contact of the first intermediate relay KM1 is a first normally open contact;

[0062] The two ends of the coil in the first intermediate relay KM1 are respectively connected to the two AC input ends of the first power conversion module;

[0063] The first time relay KT1 includes a first loop input end, a second loop input end, a third loop input end and a first loop output end;

[0064] The first end of the first normally open contact is connected to the second loop input end and the positive output end of the first power conversion module;

[0065] The second end of the first normally open contact is connected to the first circuit input end;

[0066] The third loop input end is connected to the negative output end of the first power conversion module and the negative pole of the load, and the first loop output end is connected to the positive pole of the load.

[0067] Among them, the first power conversion module SP1 is a switching module with both AC / DC and DC / DC functions, with two AC input terminals and two DC input terminals. The AC mains is connected to the AC input terminal (AC / DC terminal) of the first power conversion module SP1, and the battery of the DC power supply is connected to the DC input terminal (DC / DC terminal) of the first power conversion module SP1. SP1 automatically realizes priority AC power supply.

[0068] For example, Figure 3 As shown, the AC mains and the battery of the first energy storage cabinet are simultaneously connected to the first power conversion module SP1. Under the action of the target working voltage, the coil of the first intermediate relay KM1 is energized, the first normally open contact corresponding to the first intermediate relay KM1 is closed, and the circuit from the first circuit input terminal A to the first circuit output terminal B of the first time relay KT1 is connected, and the DC load is supplied by the AC mains. When the AC mains loses power, the first intermediate relay KM1 loses power, the first normally open contact corresponding to KM1 is disconnected, and the first time relay KT1 detects the disconnection signal of the first circuit input terminal A. The first time relay KT1 controls the circuit from the first circuit input terminal A to the first circuit output terminal B to be disconnected, and controls the circuit from the second circuit input terminal A1 to the first circuit output terminal B to be connected. After the timing time is reached, the circuit from the second circuit input terminal A1 to the first circuit output terminal B is automatically disconnected, so as to realize the control of the battery backup time in the first power conversion module SP1 and prevent the battery from running out of power. If the AC mains is restored during the battery-delayed power supply process of the first power conversion module SP1, the first intermediate relay KM1 is energized, the first normally open contact is closed, the first time relay KT1 detects the closing signal of the first circuit input terminal A, the first time relay KT1 controls the A to B circuit to be turned on, controls the A1 to B circuit to be turned off, and the load is switched to AC mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. Among them, the above intermediate relay can be replaced by a solid-state relay or a time relay to achieve the same function, which will not be described in detail here.

[0069] Optionally, the first power conversion module further includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the battery.

[0070] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0071] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0072] like Figure 3 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0073] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements, such as Figure 3 As shown, the number of the first normally open contacts of KM1 in the figure is one, and it can also be drawn as two or more in parallel. The contacts drawn in the accompanying drawings do not represent a limit on the number of contacts, and can be selected according to actual needs, and the specific number is not limited.

[0074] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery of the first energy storage cabinet is set, which solves the problem of the battery of the first energy storage cabinet running low, improves the reliability of the power control system, and extends the battery life.

[0075] In a possible implementation, Figure 4 As shown, the first power control module includes a battery management system BMS, a first intermediate relay KM1 and a second intermediate relay KM2, the contact of the first intermediate relay KM1 is a first normally open contact, and the contact of the second intermediate relay KM2 is a first normally closed contact;

[0076] The two ends of the coil of the first intermediate relay KM1 are respectively connected to the two AC input ends of the first power conversion module SP1;

[0077] Both ends of the first normally open contact are connected to the digital input terminals of the BMS;

[0078] The coil of the second intermediate relay KM2 is connected to the high-side digital output terminal of the BMS, and the output voltage of the high-side output terminal is the power supply voltage of the BMS;

[0079] The first end of the first normally closed contact is connected to the positive output end of the first power conversion module SP1, the second end of the first normally closed contact is connected to the positive pole of the load, and the negative output end of the first power conversion module SP1 is connected to the negative pole of the load.

[0080] Among them, the first power conversion module SP1 is a switching module with both AC / DC and DC / DC functions, with two AC input terminals and two DC input terminals. The AC mains is connected to the AC input terminal (AC / DC terminal) of the first power conversion module SP1, and the battery of the DC power supply is connected to the DC input terminal (DC / DC terminal) of the first power conversion module SP1. SP1 automatically realizes priority AC power supply.

[0081] For example, Figure 4 As shown, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS, and the coil of the second intermediate relay KM2 is connected to the high-side digital output terminal DO of the BMS. The voltage when DO is output is the power supply voltage of the BMS. After the self-locking button SB2 is closed, the coil of the second intermediate relay KM2 is de-energized, the first normally closed contact of KM2 is closed, and the AC mains power supply and the battery are simultaneously input into the first power conversion module SP1. SP1 automatically implements AC power supply priority and outputs the target working voltage. The coil of the first intermediate relay KM1 is energized, and the first normally open contact corresponding to the first intermediate relay KM1 is closed. The DI of the BMS collects the signal that the first normally open contact changes from the open position to the closed position. At this time, the output terminal DO of the BMS has no output, and the first normally closed contact of KM2 is closed, and the AC mains supplies power to the DC load. When the AC mains loses power, the battery on the DC / DC side is switched to supply power to the DC load, and there is no delay switching. At the same time, the BMS detects that the contact of the first intermediate relay KM1 changes from the closed position to the open position, and the BMS starts timing internally. After the preset timing duration is reached, the high-side output terminal DO of the BMS outputs a voltage, the second intermediate relay KM2 is energized, the first normally closed contact of KM2 is disconnected, and the first power conversion module SP1 stops supplying power to the DC load, thereby controlling the battery backup time and preventing the battery from running out of power. If the battery is powered and the AC mains is restored during the timing of the BMS, the BMS detects that the contact of the first intermediate relay KM1 changes from the open position to the closed position, stops timing and resets the current timing, the high-side output terminal DO of the BMS does not output, and the first normally closed contact of KM2 is closed. At this time, the load automatically switches to mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. In this embodiment, the BMS is used to control the high-side digital output terminal DO to stop outputting voltage when the digital input terminal DI detects that the first normally open contact changes from the open position to the closed position; the BMS is also used to start timing when the digital input terminal DI detects that the first normally open contact changes from the closed position to the open position, and control the high-side digital output terminal DO to output voltage after a preset time. Among them, the above-mentioned intermediate relay can be replaced by a solid-state relay or a time relay to achieve the same function, and the details are not repeated here.

[0082] It should be noted that the contact of the second intermediate relay KM2 can also be a second normally open contact. Then, when the contact of the first intermediate relay KM1 changes from open to closed, the input terminal DI of the BMS receives a signal, and the output terminal DO of the BMS outputs a DC24V voltage, so that the second normally open contact of KM2 is closed, and the DC load is powered by the AC mains. When the AC mains loses power, the battery on the DC / DC side powers the DC load without delay. At the same time, the BMS detects that the contact signal of the first intermediate relay KM1 changes from closed to open, and the BMS starts timing internally. After the preset time is reached, the high-side output DO of the BMS stops outputting the DC24V voltage, the coil of the second intermediate relay KM2 loses power, the second normally open contact of KM2 is disconnected, and the battery stops supplying power to the DC load, thereby controlling the battery backup time and preventing the battery from running out of power.

[0083] Optionally, the first power conversion module further includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the battery.

[0084] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0085] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0086] like Figure 4 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0087] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements, such as Figure 4 As shown, the number of the first normally closed contacts of KM2 in the figure is one, and it can also be drawn as two or more in parallel. The contacts drawn in the accompanying drawings do not represent a limit on the number of contacts, and can be selected according to actual needs, and the specific number is not limited.

[0088] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery of the first energy storage cabinet is set, which solves the problem of the battery of the first energy storage cabinet running low, improves the reliability of the power control system, and extends the battery life.

[0089] In a possible implementation, Figure 5 As shown, the first power control module includes a battery management system BMS, a DC circuit breaker QF and a first intermediate relay KM1, and the contact of the first intermediate relay is a first normally open contact;

[0090] The two ends of the coil of the first intermediate relay KM1 are respectively connected to the two AC input ends of the first power conversion module;

[0091] Both ends of the first normally open contact are connected to the digital input terminals of the BMS;

[0092] The positive output terminal of the first power conversion module SP1 is connected to the positive electrode of the load after passing through the DC circuit breaker QF, and the negative output terminal of the first power conversion module SP1 is connected to the negative electrode of the load after passing through the DC circuit breaker QF.

[0093] Among them, the first power conversion module SP1 is a switching module with both AC / DC and DC / DC functions, with two AC input terminals and two DC input terminals. The AC mains is connected to the AC input terminal (AC / DC terminal) of the first power conversion module SP1, and the battery of the DC power supply is connected to the DC input terminal (DC / DC terminal) of the first power conversion module SP1. SP1 automatically realizes priority AC power supply.

[0094] For example, Figure 5As shown, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS. Press the self-locking button SB2, manually close the DC circuit breaker QF, input the AC mains power supply and the battery at the same time, and the AC mains is used as the AC power supply to input the first power conversion module SP1. SP1 automatically implements AC power supply priority and outputs the target working voltage. The coil of the first intermediate relay KM1 is energized, and the first normally open contact corresponding to the first intermediate relay KM1 is closed. The DI of the BMS collects the signal that the first normally open contact changes from the open position to the closed position. At this time, the electric control of the DC circuit breaker QF is energized to prepare for the circuit breaker action, and the AC mains supplies power to the DC load. When the AC mains loses power, the battery on the DC / DC side is used to supply power to the DC load, and there is no delay switching. At the same time, the BMS detects that the contact of the first intermediate relay KM1 changes from the closed position to the open position, and the BMS starts timing internally. After the preset timing duration is reached, the BMS's opening control DO output port controls the QF electric operator to open the switch, and the first power conversion module SP1 stops supplying power to the DC load, thereby controlling the battery backup time and preventing the battery from running out of power. If the battery of the first power conversion module SP1 is powered, and the AC mains is restored during the timing of the BMS, the BMS detects that the contact of the first intermediate relay KM1 changes from the open position to the closed position, stops timing and resets the current timing, and the BMS's closing control DO output port controls the QF electric operator to close the switch, and the load automatically switches to mains power. When the AC power fails next time, the above process is repeated, and this cycle repeats automatically. In this embodiment, the BMS is used to stop timing and return to zero when the digital input terminal detects that the first normally open contact changes from the open position to the closed position, and control the electric operation of the DC circuit breaker to close; the BMS is also used to start timing when the digital input terminal detects that the first normally open contact changes from the closed position to the open position, and control the electric operation of the DC circuit breaker to open after a preset time. Among them, the above-mentioned intermediate relay can be replaced by a solid-state relay or a time relay to achieve the same function, and the details are not repeated here.

[0095] Optionally, the first power conversion module further includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the battery.

[0096] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0097] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0098] like Figure 5 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0099] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements. The contacts drawn in the attached figure do not represent a limit on the number of contacts. They can be selected according to actual needs, and there is no limit on the specific number.

[0100] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery of the first energy storage cabinet is set, which solves the problem of the battery of the first energy storage cabinet running low, improves the reliability of the power control system, and extends the battery life.

[0101] In a possible implementation, Figure 6 As shown, the power control system also includes a backup power supply, and the first energy storage cabinet also includes: a first diode module 130 and a second power control module 140;

[0102] The positive output terminal of the first power conversion module 110 is connected to the first input terminal of the first diode module 130 through the contact of at least one relay; the second input terminal of the first diode module 130 is connected to the positive output terminal of the second power control module 140, and the output terminal of the first diode module 130 is connected to the positive electrode of the load;

[0103] The negative output terminal of the first power conversion module 110 is connected to the negative output terminal of the second power control module and the negative electrode of the load;

[0104] The first power control module 120 is used to control the conduction time between the positive output terminal of the first power conversion module and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay;

[0105] The second power supply control module 140 is used to control the conduction time between the positive output terminal of the backup power supply and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay;

[0106] The first diode module 130 is used to provide the direct current output by the first power conversion module 110 or the direct current output by the backup power supply to the positive electrode of the load.

[0107] It should be noted that the AC mains and the battery are connected to the first power conversion module 110. Figure 6The backup power source may be a separate battery or another energy storage cabinet containing the same power control system.

[0108] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery in the first energy storage cabinet is set to prevent the battery in the first energy storage cabinet from running out of power. At the same time, it can be ensured that when the AC mains power and the DC backup power of the first energy storage cabinet lose power at the same time, power is supplied by the backup power supply, and the backup time of the backup power supply is set to prevent the battery in the backup power supply from running out of power, thereby improving the reliability of the power control system and extending the battery life.

[0109] In a possible implementation, Figure 7 As shown, the first power control module includes a first power-off delay relay KT1, the contact of the first power-off delay relay KT1 is a first delayed disconnection contact KT1-1, the second power control module includes an energy storage capacitor C, a first power-on delay relay KT2 and a first intermediate relay KM1, the contact of the first power-on delay relay is a first delayed disconnection contact KT2-2, and the contact of the first intermediate relay is a first normally closed contact;

[0110] The two ends of the coil in the first power-off delay relay KT1 are respectively connected to the two AC input ends of the first power conversion module SP1;

[0111] The first end of the first delayed disconnecting make contact KT1-1 is connected to the positive output end of the first power conversion module, and the second end of the first delayed disconnecting make contact KT1-1 is connected to the first end of the coil of the first intermediate relay KM1, the first end of the energy storage capacitor C, and the first input end of the first diode module DK;

[0112] The negative output terminal of the first power conversion module is connected to the negative output terminal of the backup power supply, the second end of the first intermediate relay KM1, the second end of the energy storage capacitor C, the second end of the coil of the first power-on delay relay KT2, and the negative electrode of the load;

[0113] The first end of the coil in the first power-on delay relay KT2 is connected to the second end of the first normally closed contact and the first end of the first delayed opening break contact KT2-2;

[0114] The second end of the first delayed breaking contact KT2-2 is connected to the second input end of the first diode module;

[0115] The first end of the first normally closed contact is connected to the positive output end of the backup power supply.

[0116] For example, Figure 7As shown, the self-locking button SB2 is pressed, and the AC mains and the battery of the first energy storage cabinet are input at the same time. The first power conversion module SP1 automatically realizes AC power supply priority. Under the action of the target working voltage, the coil of the first power-off delay relay KT1 is energized, and the first delayed disconnection contact KT1-1 is closed, and the AC mains of the first energy storage cabinet supplies the DC load. When the AC mains is powered off, the coil of the first power-off delay relay KT1 is powered off, and the first delayed disconnection contact KT1-1 is delayed to disconnect, and automatically disconnects after the timing time is reached, so as to realize the control of the backup time by the battery of the first energy storage cabinet and prevent the battery of the first energy storage cabinet from running out of power. If the AC mains is restored during the power supply delay process of the first power conversion module SP1, then after the first power conversion module SP1 provides voltage to the coil of the first power-off delay relay KT1, the coil of the first power-off delay relay KT1 is energized, and the first delayed disconnection contact KT1-1 of KT1 remains closed, and the load is switched to AC mains power supply. When the AC power fails next time, the first power-off delay relay KT1 will restart the timing delay disconnection, and this cycle will repeat automatically. When the first energy storage cabinet performs the above-mentioned dual power switching, the coil of the first intermediate relay KM1 is energized and works, and the first normally closed contact of KM1 is disconnected, and power cannot be drawn from the backup power supply. When the AC mains and battery of the first energy storage cabinet lose power at the same time, the first intermediate relay KM1 loses power, the first normally closed contact of KM1 closes, and the coil of the first power-on delay relay KT2 is energized. At this time, the battery of the backup power supply is used for power supply. When the preset timing length of KT2 is reached, the first delayed disconnection moving breaking contact KT2-2 is automatically disconnected, controlling the backup power supply time provided by the backup power supply to the first energy storage cabinet, preventing the backup power supply battery from running out of power, improving the safety and reliability of the power control system, and extending the battery life.

[0117] The function of the first diode module DK1 is to isolate the power output of the first energy storage cabinet from the backup power output of the backup power supply to prevent the two power supplies from being connected in parallel, thereby avoiding repeated actions of the first intermediate relay KM1.

[0118] It should be noted that because the intermediate relay is a mechanical structure, the relay action time takes tens of milliseconds. When the power-off delay output time is less than the relay action time, it will cause the load to have a short power-off restart. In order to avoid power-off restart, a storage capacitor can be provided, such as Figure 7 As shown, the energy storage capacitor C is connected between the first input end of the diode switching module DK and the negative electrode of the load. During the power circuit switching delay period between the first energy storage cabinet and the backup power supply through the first intermediate relay KM1, the energy storage capacitor C supports the DC load power supply to prevent the load from powering off and restarting.

[0119] The minimum capacity of the energy storage capacitor C meets the requirement: C = 2 × P × t / (U1 2 -U2 2), where C is the capacity of the energy storage capacitor (in mF), P is the power of the DC load (in W), t is the time required for the capacitor to support (in ms); U1 is the rated voltage of the DC load for normal operation (in V), and U2 is the minimum voltage of the DC load for normal operation (in V).

[0120] It is understandable that the above-mentioned intermediate relay can be replaced by a solid-state relay to achieve the same function while eliminating the energy storage capacitor, and the details will not be repeated here.

[0121] Optionally, the first power conversion module also includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the energy storage cabinet battery.

[0122] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0123] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0124] like Figure 7 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0125] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements, such as Figure 7 As shown in the figure, the number of the first delayed opening and closing contacts KT1-1 of KT1 is two, and it can also be drawn as one or more in parallel. The number of the second delayed opening and closing contacts KT2-1 of KT2 is two, and it can also be drawn as one or more in parallel. The contacts drawn in the accompanying drawings do not represent a limitation on the number of contacts, and they can be selected according to actual needs, and there is no limitation on the specific number.

[0126] When the AC mains of the first energy storage cabinet fails, the AC mains of the backup power supply also fails, and the battery of the backup power supply provides DC power; when the AC mains line of the first energy storage cabinet fails, the AC mains of the backup power supply is normal, and the AC mains of the backup power supply is converted into DC power for power supply.

[0127] It is also understandable that Figure 8 As shown, when the backup power supply of the first energy storage cabinet is the second energy storage cabinet, that is, the power control system includes the first energy storage cabinet and the second energy storage cabinet at the same time, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the second energy storage cabinet in the power control system includes:

[0128] A second power conversion module SP2, a third power control module, a fourth power control module and a second diode module DK2, the third power control module includes at least one relay, and the fourth power control module includes at least one relay;

[0129] The positive output terminal of the second power conversion module SP2 is connected to the first input terminal of the second diode module DK2 through the contact of at least one relay; the second input terminal of the second diode module DK2 is connected to the positive output terminal of the fourth power control module, and the output terminal of the second diode module DK2 is connected to the positive electrode of the load;

[0130] The negative output terminal of the second power conversion module SP2 is connected to the negative output terminal of the fourth power control module and the negative electrode of the load;

[0131] The third power control module is used to control the conduction time between the positive output terminal of the second power conversion module SP2 and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay;

[0132] The fourth power supply control module is used to control the conduction time between the positive output terminal of the first energy storage cabinet and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay;

[0133] The second diode module DK2 is used to provide the direct current output by the second power conversion module SP2 or the direct current output by the first energy storage cabinet to the positive electrode of the load;

[0134] The second power conversion module SP2 has an AC input terminal and a DC input terminal. The AC input terminal is used to connect to the AC mains, and the DC input terminal is used to connect to the battery. The second power conversion module is used to convert the DC power output by the battery or the AC mains into DC power of the target working voltage.

[0135] For example, Figure 8As shown, the self-locking button SB2 is pressed, and the AC mains and the battery of the second energy storage cabinet are input at the same time. The second power conversion module SP2 automatically realizes priority AC power supply. Under the action of the target working voltage, the coil of the first power-off delay relay KT1 is energized, and the first delayed disconnection contact KT1-1 is closed, and the AC mains of the second energy storage cabinet supplies the DC load. When the AC mains loses power, the coil of the first power-off delay relay KT1 loses power, and the first delayed disconnection contact KT1-1 is delayed to disconnect, and automatically disconnects after the timing time is reached, so as to realize the control of the backup time by the battery of the second energy storage cabinet and prevent the battery of the second energy storage cabinet from running out of power. If the AC mains is restored during the power supply delay process of the second power conversion module SP2, then after the second power conversion module SP2 provides voltage to the coil of the first power-off delay relay KT1, the coil of the first power-off delay relay KT1 is energized, and the first delayed disconnection contact KT1-1 of KT1 remains closed, and the load is switched to AC mains power supply. When the AC power fails next time, the first power-off delay relay KT1 will restart the timing delay disconnection, and this cycle will repeat automatically. When the second energy storage cabinet performs the above-mentioned dual power switching, the coil of the first intermediate relay KM1 is energized and works, the first normally closed contact of KM1 is disconnected, and power cannot be drawn from the first energy storage cabinet. When the AC mains and battery of the second energy storage cabinet lose power at the same time, the first intermediate relay KM1 loses power, the first normally closed contact of KM1 closes, and the coil of the first power-on delay relay KT2 is energized. At this time, the battery of the first energy storage cabinet supplies power. When the preset timing length of KT2 is reached, the first delayed disconnection moving breaking contact KT2-2 is automatically disconnected, controlling the backup power time provided by the first energy storage cabinet for the second energy storage cabinet, preventing the battery of the first energy storage cabinet from running out of power, and improving the safety and reliability of the power control system.

[0136] Similarly, when the structures of the first energy storage cabinet and the second energy storage cabinet are the same, the working process of the second energy storage cabinet is similar to that of the first energy storage cabinet, except that the backup power supply of the second energy storage cabinet is provided by the first energy storage cabinet, and the backup power supply of the first energy storage cabinet is provided by the second energy storage cabinet, and other parts are the same. When there are a first energy storage cabinet and a second energy storage cabinet with the same structure, and the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, then their connection relationship is as follows: Figure 8 As shown. Under normal circumstances, the two energy storage cabinets (the first energy storage cabinet and the second energy storage cabinet) work independently and serve as backup for each other. The working principles of the two energy storage cabinets serving as backup for each other are the same. When the power supply of one energy storage cabinet fails, the power supply of the other energy storage cabinet serves as backup, and the backup time is controlled to prevent the battery from running out of power.

[0137] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery in the first energy storage cabinet is set, which solves the problem that the battery in the first energy storage cabinet may be depleted, and at the same time ensures that when the AC mains power and the DC backup power of the first energy storage cabinet are simultaneously powered off, power is supplied through the second energy storage cabinet, and the backup time of the second energy storage cabinet is set, so as to prevent the battery in the second energy storage cabinet from being depleted, thereby improving the reliability of the power control system and extending the battery life.

[0138] In a possible implementation, Fig. 9 As shown, the first power supply control module includes a first power-off delay relay KT1 and a second power-off delay relay KT2, the contact of the first power-off delay relay KT1 is a first delayed disconnection contact KT1-1, and the contact of the second power-off delay relay KT2 is a second delayed disconnection contact KT2-1; the second power supply control module includes a first solid-state relay KM1, and the contact of the first solid-state relay KM1 is a first normally closed contact;

[0139] The two ends of the coil in the first power-off delay relay KT1 are respectively connected to the two AC input ends of the first power conversion module SP1;

[0140] The first end of the first delayed disconnecting make contact KT1-1 is connected to the positive output end of the first power conversion module SP1 and the first end of the second delayed disconnecting make contact KT2-1, and the second end of the first delayed disconnecting make contact KT1-1 is connected to the first end of the coil of the second power-off delay relay KT2;

[0141] The second end of the second delayed opening make contact KT2-1 is connected to the first end of the coil of the first solid-state relay KM1, the first input end of the first diode module DK1, and the normally closed contact of the backup power supply;

[0142] The negative output terminal of the first power conversion module SP1, the second end of the coil of the second power-off delay relay KT2, the second end of the coil of the first solid-state relay KM1, the negative output terminal of the backup power supply, and the negative electrode of the load are connected;

[0143] The second input end of the first diode module DK1 is connected to the positive output end of the backup power supply through the first normally closed contact, and the output end of the first diode module DK1 is connected to the positive electrode of the load.

[0144] For example, Fig. 9As shown, the self-locking button SB2 is pressed, and the AC mains and the battery of the first energy storage cabinet are input at the same time, and the first power conversion module SP1 automatically realizes AC power supply priority. Under the action of the target working voltage, the coil of the first power-off delay relay KT1 is energized, the first delayed disconnection moving contact KT1-1 is closed, the coil of the second power-off delay relay KT2 is energized, and the second delayed disconnection moving contact KT2-1 is closed, and the AC mains of the first energy storage cabinet supplies the DC load. When the AC mains loses power, the coil of the first power-off delay relay KT1 loses power, the first delayed disconnection moving contact KT1-1 is delayed to disconnect, the coil of the second power-off delay relay KT2 loses power, and the second delayed disconnection moving contact KT2-1 is delayed to disconnect, and automatically disconnects after reaching the preset timing length, thereby realizing the control of the backup power time of the first energy storage cabinet and preventing the battery of the first energy storage cabinet from running out of power.

[0145] If the AC mains is restored during the power supply delay process of the first power conversion module SP1, then after the first power conversion module SP1 provides voltage to the coil of the first power-off delay relay KT1, the coil of the first power-off delay relay KT1 is energized, the first delayed disconnection contact KT1-1 of KT1 remains closed, the coil of the second power-off delay relay KT2 is energized, and the second delayed disconnection contact KT2-1 is closed, and the load is switched to AC mains power supply. When the next AC power failure occurs, the first power-off delay relay KT1 and the second power-off delay relay KT2 will restart the timing delay disconnection, and the cycle will repeat automatically. When the first energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM1 is energized and works, the first normally closed contact of KM1 is disconnected, and power cannot be drawn from the backup power supply. When the AC mains and battery of the first energy storage cabinet lose power at the same time, the first solid-state relay KM1 loses power, and the first normally closed contact of KM1 closes. At this time, the backup power supply is used for power supply. The battery of the backup power supply will automatically disconnect after supplying power for a period of time. The backup power supply battery controls the backup power supply time provided by the first energy storage cabinet to prevent the backup power supply battery from running out of power, thereby improving the safety and reliability of the power control system and extending the battery life.

[0146] The function of the first diode module DK1 is to isolate the power output of the first energy storage cabinet from the backup power output of the backup power supply to prevent the two power supplies from being connected in parallel, thereby avoiding repeated actions of the first solid-state relay KM1.

[0147] It is understandable that the first power-off delay relay KT1 can be replaced by a solid-state relay or an intermediate relay to achieve the same function, and the details will not be repeated here.

[0148] Optionally, the first power conversion module further includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the battery.

[0149] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0150] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0151] like Fig. 9 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0152] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements, such as Fig. 9 As shown in the figure, the number of the first delayed opening and closing contacts KT1-1 of KT1 is one, and it can also be drawn as two or more in parallel. The number of the second delayed opening and closing contacts KT2-1 of KT2 is two, and it can also be drawn as one or more in parallel. The contacts drawn in the accompanying drawings do not represent a limitation on the number of contacts, and can be selected according to actual needs, and there is no limitation on the specific number.

[0153] When the AC mains of the first energy storage cabinet fails, the AC mains of the backup power supply also fails, and the battery of the backup power supply provides DC power; when the AC mains line of the first energy storage cabinet fails, the AC mains of the backup power supply is normal, and the AC mains of the backup power supply is converted into DC power for power supply.

[0154] It is also understandable that Fig.10 As shown, when the backup power supply of the first energy storage cabinet is the second energy storage cabinet, that is, the power control system includes the first energy storage cabinet and the second energy storage cabinet at the same time, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the structure of the second energy storage cabinet in the power control system can refer to Figure 8 The structure of the embodiment will not be described in detail here.

[0155] For example, Fig.10As shown, by pressing the self-locking button SB2, the AC mains and the battery of the second energy storage cabinet are input simultaneously, and the second power conversion module SP2 automatically realizes AC power supply priority. Under the action of the target working voltage, the coil of the first power-off delay relay KT1 is energized, the first delayed disconnection moving contact KT1-1 is closed, the coil of the second power-off delay relay KT2 is energized, and the second delayed disconnection moving contact KT2-1 is closed, and the AC mains of the second energy storage cabinet supplies the DC load. When the AC mains is de-energized, the coil of the first power-off delay relay KT1 is de-energized, the first delayed disconnection moving contact KT1-1 is delayed to disconnect, the coil of the second power-off delay relay KT2 is de-energized, and the second delayed disconnection moving contact KT2-1 is delayed to disconnect, and automatically disconnects after reaching the preset timing length, thereby realizing the control of the backup power time of the second energy storage cabinet and preventing the battery of the second energy storage cabinet from running out of power.

[0156] If the AC mains is restored during the power supply delay process of the second power conversion module SP2, then after the second power conversion module SP2 provides voltage to the coil of the first power-off delay relay KT1, the coil of the first power-off delay relay KT1 is energized, the first delayed disconnection contact KT1-1 of KT1 remains closed, the coil of the second power-off delay relay KT2 is energized, and the second delayed disconnection contact KT2-1 is closed, and the load is switched to AC mains power supply. When the next AC power failure occurs, the first power-off delay relay KT1 and the second power-off delay relay KT2 will restart the timing delay disconnection, and the cycle will repeat automatically. When the second energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM1 is energized and works, the first normally closed contact of KM1 is disconnected, and power cannot be taken from the first energy storage cabinet. When the AC mains and battery of the second energy storage cabinet lose power at the same time, the first solid-state relay KM1 loses power, and the first normally closed contact of KM1 closes. At this time, the first energy storage cabinet is used for power supply. The battery of the first energy storage cabinet will automatically disconnect after supplying power for a period of time, and the backup power time provided by the battery of the first energy storage cabinet for the second energy storage cabinet is controlled to prevent the battery of the first energy storage cabinet from running out of power, thereby improving the safety and reliability of the power control system.

[0157] Similarly, when the structures of the first energy storage cabinet and the second energy storage cabinet are the same, the working process of the second energy storage cabinet is similar to that of the first energy storage cabinet, except that the backup power supply of the second energy storage cabinet is provided by the first energy storage cabinet, and the backup power supply of the first energy storage cabinet is provided by the second energy storage cabinet, and other parts are the same. When there are a first energy storage cabinet and a second energy storage cabinet with the same structure, and the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, then their connection relationship is as follows: Fig.10 As shown. Under normal circumstances, the two energy storage cabinets (the first energy storage cabinet and the second energy storage cabinet) work independently and serve as backup for each other. The working principles of the two energy storage cabinets serving as backup for each other are the same. When the power supply of one energy storage cabinet fails, the power supply of the other energy storage cabinet serves as backup, and the backup time is controlled to prevent the battery from running out of power.

[0158] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery in the first energy storage cabinet is set, which solves the problem that the battery in the first energy storage cabinet may be depleted, and at the same time ensures that when the AC mains power and the DC backup power of the first energy storage cabinet are simultaneously powered off, power is supplied through the second energy storage cabinet, and the backup time of the second energy storage cabinet is set, so as to prevent the battery in the second energy storage cabinet from being depleted, thereby improving the reliability of the power control system and extending the battery life.

[0159] In a possible implementation, Fig.11 As shown, the first power control module includes a first intermediate relay KM1 and a first time relay KT1, and the contact of the first intermediate relay KM1 is a first normally open contact; the second power control module includes a first solid-state relay KM2, and the contact of the first solid-state relay KM2 is a first normally closed contact;

[0160] The two ends of the coil KM1 in the first intermediate relay are respectively connected to the two AC input ends of the first power conversion module SP1;

[0161] The first time relay KT1 includes a first loop input end, a second loop input end, a third loop input end and a first loop output end;

[0162] The first end of the first normally open contact is connected to the second loop input end and the positive output end of the first power conversion module SP1;

[0163] The second end of the first normally open contact is connected to the first circuit input end;

[0164] The third loop input end is connected to the negative output end of the first power conversion module SP1, the negative output end of the backup power supply, and the negative electrode of the load;

[0165] The first loop output end is connected to the first end of the coil of the first solid-state relay KM2 and the first input end of the first diode module DK1;

[0166] The second input end of the first diode module DK1 is connected to the positive output end of the backup power supply through the first normally closed contact, and the output end of the first diode module DK1 is connected to the positive electrode of the load.

[0167] For example, the AC mains and the battery of the first energy storage cabinet are simultaneously connected to the first power conversion module SP1. Fig.11As shown, under the action of the target working voltage, the coil of the first intermediate relay KM1 is energized, the first normally open contact corresponding to the first intermediate relay KM1 is closed, and the circuit from the first circuit input terminal A to the first circuit output terminal B of the first time relay KT1 is connected, and the AC mains supplies the DC load. When the AC mains loses power, the first intermediate relay KM1 loses power, the first normally open contact corresponding to KM1 is disconnected, and the first time relay KT1 detects the disconnection signal of the first circuit input terminal A. The first time relay KT1 controls the circuit from the first circuit input terminal A to the first circuit output terminal B to be disconnected, and controls the circuit from the second circuit input terminal A1 to the first circuit output terminal B to be connected. After reaching the preset timing time, the circuit from the second circuit input terminal A1 to the first circuit output terminal B is automatically disconnected, so as to realize the control of the battery backup time in the first power conversion module SP1 and prevent the battery from running out of power. If the AC mains power is restored during the process of the first power conversion module SP1 using the battery to delay power supply, the first intermediate relay KM1 is energized, the first normally open contact is closed, and the first time relay KT1 detects the closing signal of the first circuit input terminal A. The first time relay KT1 controls the A to B circuit to be turned on, and controls the A1 to B circuit to be disconnected, and the load is switched to AC mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. Among them, the above intermediate relay KM1 can be replaced by a solid-state relay or a time relay to achieve the same function, and the details are not repeated here. When the first energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM2 is energized and works, and the first normally closed contact of KM2 is disconnected, and power cannot be drawn from the backup power supply. When the AC mains and battery of the first energy storage cabinet lose power at the same time, the first solid-state relay KM2 loses power, and the first normally closed contact of KM2 closes. At this time, the backup power supply is used for power supply. The battery of the backup power supply will automatically disconnect after supplying power for a period of time, and the backup power supply battery controls the backup power supply time provided by the first energy storage cabinet to prevent the backup power supply battery from running out of power, thereby improving the safety and reliability of the power control system and extending the battery life.

[0168] The function of the first diode module DK1 is to isolate the power output of the first energy storage cabinet from the backup power output of the backup power supply to prevent the two power supplies from being connected in parallel, thereby avoiding repeated actions of the first intermediate relay KM1.

[0169] It can be understood that the first intermediate relay KM1 can be replaced by a solid-state relay or a time relay to achieve the same function, and the details will not be repeated here.

[0170] Optionally, the first power conversion module further includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the battery.

[0171] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0172] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0173] like Fig.11 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0174] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements. The contacts drawn in the attached figure do not represent a limit on the number of contacts. They can be selected according to actual needs, and there is no limit on the specific number.

[0175] When the AC mains of the first energy storage cabinet fails, the AC mains of the backup power supply also fails, and the battery of the backup power supply provides DC power; when the AC mains line of the first energy storage cabinet fails, the AC mains of the backup power supply is normal, and the AC mains of the backup power supply is converted into DC power for power supply.

[0176] It is also understandable that Fig.12 As shown, when the backup power supply of the first energy storage cabinet is the second energy storage cabinet, that is, the power control system includes the first energy storage cabinet and the second energy storage cabinet at the same time, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the structure of the second energy storage cabinet in the power control system can refer to Figure 8 The structure of the embodiment will not be described in detail here.

[0177] For example, the AC mains and the battery of the second energy storage cabinet are simultaneously connected to the second power conversion module SP2. Fig.12As shown, under the action of the target working voltage, the coil of the first intermediate relay KM1 is energized, the first normally open contact corresponding to the first intermediate relay KM1 is closed, the circuit from the first circuit input terminal A to the first circuit output terminal B of the first time relay KT1 is connected, and the AC mains supplies the DC load. When the AC mains loses power, the first intermediate relay KM1 loses power, the first normally open contact corresponding to KM1 is disconnected, the first time relay KT1 detects the disconnection signal of the first circuit input terminal A, the first time relay KT1 controls the circuit from the first circuit input terminal A to the first circuit output terminal B to be disconnected, and controls the circuit from the second circuit input terminal A1 to the first circuit output terminal B to be connected, and the circuit from the second circuit input terminal A1 to the first circuit output terminal B is automatically disconnected after the preset timing duration is reached, so as to realize the control of the battery backup time in the second power conversion module SP2 and prevent the battery from running out of power. If the AC mains power is restored during the battery-delayed power supply process of the second power conversion module SP2, the first intermediate relay KM1 is energized, the first normally open contact is closed, and the first time relay KT1 detects the closing signal of the first circuit input terminal A. The first time relay KT1 controls the A to B circuit to be turned on, and controls the A1 to B circuit to be disconnected, and the load is switched to AC mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. Among them, the above intermediate relay KM1 can be replaced by a solid-state relay or a time relay to achieve the same function, and the details are not repeated here. When the second energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM2 is energized and works, and the first normally closed contact of KM2 is disconnected, and power cannot be drawn from the backup power supply. When the AC mains and battery of the second energy storage cabinet lose power at the same time, the first solid-state relay KM2 loses power, and the first normally closed contact of KM2 closes. At this time, the first energy storage cabinet is used for power supply. The battery of the first energy storage cabinet will automatically disconnect after supplying power for a period of time, and the backup power time provided by the battery of the first energy storage cabinet for the second energy storage cabinet is controlled to prevent the battery of the first energy storage cabinet from running out of power, thereby improving the safety and reliability of the power control system.

[0178] Similarly, when the structures of the first energy storage cabinet and the second energy storage cabinet are the same, the working process of the second energy storage cabinet is similar to that of the first energy storage cabinet, except that the backup power supply of the second energy storage cabinet is provided by the first energy storage cabinet, and the backup power supply of the first energy storage cabinet is provided by the second energy storage cabinet, and other parts are the same. When there are a first energy storage cabinet and a second energy storage cabinet with the same structure, and the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, then their connection relationship is as follows: Fig.12 As shown. Under normal circumstances, the two energy storage cabinets (the first energy storage cabinet and the second energy storage cabinet) work independently and serve as backup for each other. The working principles of the two energy storage cabinets serving as backup for each other are the same. When the power supply of one energy storage cabinet fails, the power supply of the other energy storage cabinet serves as backup, and the backup time is controlled to prevent the battery from running out of power.

[0179] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery in the first energy storage cabinet is set, which solves the problem that the battery in the first energy storage cabinet may be depleted, and at the same time ensures that when the AC mains power and the DC backup power of the first energy storage cabinet are simultaneously powered off, power is supplied through the second energy storage cabinet, and the backup time of the second energy storage cabinet is set, so as to prevent the battery in the second energy storage cabinet from being depleted, thereby improving the reliability of the power control system and extending the battery life.

[0180] In a possible implementation, Fig.13 As shown, the first power control module includes a battery management system BMS, a first intermediate relay KM1 and a second intermediate relay KM2, the contact of the first intermediate relay KM1 is a first normally open contact, and the contact of the second intermediate relay KM2 is a first normally closed contact; the second power control module includes a first solid-state relay KM3, and the contact of the first solid-state relay KM3 is a second normally closed contact;

[0181] The two ends of the coil in the first intermediate relay KM1 are respectively connected to the two AC input ends of the first power conversion module;

[0182] Both ends of the first normally open contact are connected to the digital input terminals of the BMS;

[0183] The coil of the second intermediate relay KM2 is connected to the high-side digital output terminal of the BMS, and the output voltage of the high-side output terminal is the power supply voltage of the BMS;

[0184] The first end of the first normally closed contact is connected to the positive output end of the first power conversion module, and the second end of the first normally closed contact is connected to the first end of the coil of the first solid-state relay KM3, the first input end of the first diode module DK1, and the positive output end of the backup power supply;

[0185] The negative output terminal of the first power conversion module is connected to the second end of the coil in the first solid-state relay KM3, the negative output terminal of the backup power supply, and the negative electrode of the load;

[0186] The second input end of the first diode module DK1 is connected to the positive output end of the backup power supply through the second normally closed contact, and the output end of the first diode module DK1 is connected to the positive electrode of the load.

[0187] For example, Fig.13As shown, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS, and the coil of the second intermediate relay KM2 is connected to the high-side digital output terminal DO of the BMS. The voltage when DO is output is the power supply voltage of the BMS. After the self-locking button SB2 is closed, the coil of the second intermediate relay KM2 is de-energized, the first normally closed contact of KM2 is closed, the AC mains power supply and the battery are input at the same time, the first power conversion module SP1 automatically realizes the priority AC power supply, the coil of the first intermediate relay KM1 is energized, the first normally open contact corresponding to the first intermediate relay KM1 is closed, and the DI of the BMS collects the signal that the first normally open contact changes from the open position to the closed position. At this time, the output terminal DO of the BMS has no output, the first normally closed contact of KM2 is closed, and the AC mains supplies power to the DC load. When the AC mains loses power, the battery of the first power conversion module SP1 is used to supply power to the DC load, and there is no delay switching. At the same time, the BMS detects that the contact of the first intermediate relay KM1 changes from the closed position to the open position, and the BMS starts timing internally. After the preset timing duration is reached, the high-side output terminal DO of the BMS outputs a voltage, the second intermediate relay KM2 is energized, the first normally closed contact of KM2 is disconnected, and the first power conversion module SP1 stops supplying power to the DC load, thereby controlling the battery backup time and preventing the battery from running out of power. If the battery of the first power conversion module SP1 is powered, and the AC mains is restored during the timing of the BMS, the BMS detects that the contact of the first intermediate relay KM1 changes from the open position to the closed position, stops timing and resets the current timing, and the high-side output terminal DO of the BMS does not output, and the first normally closed contact of KM2 is closed. At this time, the load automatically switches to mains power supply. When the AC power fails next time, the above process is repeated, and this cycle is repeated automatically. In this embodiment, the BMS is used to control the high-side digital output terminal DO to stop outputting voltage when the digital input terminal DI detects that the first normally open contact changes from the open position to the closed position; the BMS is also used to start timing when the digital input terminal DI detects that the first normally open contact changes from the closed position to the open position, and control the high-side digital output terminal DO to output voltage after a preset time. When the first energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM3 is energized and works, the first normally closed contact of KM3 is disconnected, and power cannot be drawn from the backup power supply. When the AC mains and battery of the first energy storage cabinet lose power at the same time, the first solid-state relay KM3 loses power, and the first normally closed contact of KM3 closes. At this time, the backup power supply is switched to power supply. The battery of the backup power supply will automatically disconnect after supplying power for a period of time, and the backup power supply battery is controlled to provide backup power time for the first energy storage cabinet, so as to prevent the battery of the backup power supply from running out of power, thereby improving the safety and reliability of the power control system and extending the battery life.

[0188] The function of the first diode module DK1 is to isolate the power output of the first energy storage cabinet from the backup power output of the backup power supply to prevent the two power supplies from being connected in parallel, thereby avoiding repeated actions of the first intermediate relay KM1.

[0189] It can be understood that the first intermediate relay KM1 can be replaced by a solid-state relay or a time relay to achieve the same function, and the details will not be repeated here.

[0190] Optionally, the first power conversion module also includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the energy storage cabinet battery.

[0191] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0192] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0193] like Fig.13 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0194] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements. The contacts drawn in the attached figure do not represent a limit on the number of contacts. They can be selected according to actual needs, and there is no limit on the specific number.

[0195] When the AC mains of the first energy storage cabinet fails, the AC mains of the backup power supply also fails, and the battery of the backup power supply provides DC power; when the AC mains line of the first energy storage cabinet fails, the AC mains of the backup power supply is normal, and the AC mains of the backup power supply is converted into DC power for power supply.

[0196] It is also understandable that Fig.14 As shown, when the backup power supply of the first energy storage cabinet is the second energy storage cabinet, that is, the power control system includes the first energy storage cabinet and the second energy storage cabinet at the same time, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the structure of the second energy storage cabinet in the power control system can refer to Figure 8 The structure of the embodiment will not be described in detail here.

[0197] For example, Fig.14As shown, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS, and the coil of the second intermediate relay KM2 is connected to the high-side digital output terminal DO of the BMS. The voltage when DO is output is the power supply voltage of the BMS. After the self-locking button SB2 is closed, the coil of the second intermediate relay KM2 is de-energized, the first normally closed contact of KM2 is closed, the AC mains power supply and the battery are input at the same time, the second power conversion module SP2 automatically realizes the priority AC power supply, the coil of the first intermediate relay KM1 is energized, the first normally open contact corresponding to the first intermediate relay KM1 is closed, and the DI of the BMS collects the signal that the first normally open contact changes from the open position to the closed position. At this time, the output terminal DO of the BMS has no output, the first normally closed contact of KM2 is closed, and the AC mains supplies power to the DC load. When the AC mains loses power, the battery of the second power conversion module SP2 is switched to supply power to the DC load without delay switching. At the same time, the BMS detects that the contact of the first intermediate relay KM1 changes from the closed position to the open position, and the BMS starts timing internally. After the preset timing duration is reached, the high-side output terminal DO of the BMS outputs a voltage, the second intermediate relay KM2 is energized, the first normally closed contact of KM2 is disconnected, and the second power conversion module SP2 stops supplying power to the DC load, thereby controlling the battery backup time and preventing the battery from running out of power. If the battery of the second power conversion module SP2 is powered, and the AC mains is restored during the timing of the BMS, the BMS detects that the contact of the first intermediate relay KM1 changes from the open position to the closed position, stops timing and resets the current timing, and the high-side output terminal DO of the BMS does not output, and the first normally closed contact of KM2 is closed. At this time, the load automatically switches to mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. In this embodiment, the BMS is used to control the high-side digital output terminal DO to stop outputting voltage when the digital input terminal DI detects that the first normally open contact changes from the open position to the closed position; the BMS is also used to start timing when the digital input terminal DI detects that the first normally open contact changes from the closed position to the open position, and control the high-side digital output terminal DO to output voltage after a preset time. When the second energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM3 is energized and works, the first normally closed contact of KM3 is disconnected, and power cannot be drawn from the first energy storage cabinet. When the AC mains and battery of the second energy storage cabinet lose power at the same time, the first solid-state relay KM3 loses power, and the first normally closed contact of KM3 is closed. At this time, the first energy storage cabinet is used for power supply. The battery of the first energy storage cabinet will automatically disconnect after a period of power supply, and the backup power time provided by the battery of the first energy storage cabinet to the second energy storage cabinet is controlled to prevent the battery of the first energy storage cabinet from running out of power, thereby improving the safety and reliability of the power control system.

[0198] Similarly, when the structures of the first energy storage cabinet and the second energy storage cabinet are the same, the working process of the second energy storage cabinet is similar to that of the first energy storage cabinet, except that the backup power supply of the second energy storage cabinet is provided by the first energy storage cabinet, and the backup power supply of the first energy storage cabinet is provided by the second energy storage cabinet, and other parts are the same. When there are a first energy storage cabinet and a second energy storage cabinet with the same structure, and the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, then their connection relationship is as follows: Fig.14 As shown. Under normal circumstances, the two energy storage cabinets (the first energy storage cabinet and the second energy storage cabinet) work independently and serve as backup for each other. The working principles of the two energy storage cabinets serving as backup for each other are the same. When the power supply of one energy storage cabinet fails, the power supply of the other energy storage cabinet serves as backup, and the backup time is controlled to prevent the battery from running out of power.

[0199] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup time of the battery in the first energy storage cabinet is set, which solves the problem that the battery in the first energy storage cabinet may be depleted, and at the same time ensures that when the AC mains power and the DC backup power of the first energy storage cabinet are simultaneously powered off, power is supplied through the second energy storage cabinet, and the backup time of the second energy storage cabinet is set, so as to prevent the battery in the second energy storage cabinet from being depleted, thereby improving the reliability of the power control system and extending the battery life.

[0200] In a possible implementation, Fig.15 As shown, the first power control module includes a battery management system BM, a first intermediate relay KM1 and a DC circuit breaker QF, and the contact of the first intermediate relay KM1 is a first normally open contact; the second power control module includes a first solid-state relay KM2, and the contact of the first solid-state relay KM2 is a first normally closed contact;

[0201] The two ends of the coil in the first intermediate relay KM1 are respectively connected to the two AC input ends of the first power conversion module;

[0202] Both ends of the first normally open contact are connected to the digital input terminals of the BMS;

[0203] The positive output end of the first power conversion module is connected to the first end of the coil of the first solid-state relay KM2, the first input end of the first diode module DK1, and the positive output end of the backup power supply after passing through the DC circuit breaker;

[0204] The negative output terminal of the first power conversion module is connected to the second end of the coil of the first solid-state relay KM2, the negative output terminal of the backup power supply, and the negative electrode of the load through the DC circuit breaker QF;

[0205] The second input end of the first diode module DK is connected to the positive output end of the backup power supply through the first normally closed contact, and the output end of the first diode module DK is connected to the positive electrode of the load.

[0206] For example, Fig.15 As shown, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS. Press the self-locking button SB2 to manually close the DC circuit breaker QF, input the AC mains power supply and the battery at the same time, the output terminal of the first power conversion module SP outputs the target working voltage, the coil of the first intermediate relay KM1 is energized, and the first normally open contact corresponding to the first intermediate relay KM1 is closed. The DI of the BMS collects the signal that the first normally open contact changes from the open position to the closed position. At this time, the electric control of the DC circuit breaker QF is energized to prepare for the circuit breaker action, and the AC mains supplies power to the DC load. When the AC mains loses power, the battery of the first power conversion module SP1 is used to supply power to the DC load without delay switching. At the same time, the BMS detects the signal that the contact of the first intermediate relay KM1 changes from the closed position to the open position, and the BMS starts timing internally. After the preset time is reached, the BMS's opening control DO output port controls the QF electric control to open the gate, and the first power conversion module SP1 stops supplying power to the DC load, realizing the control of the battery backup time and preventing the battery from running out of power. If the battery of the first power conversion module SP1 is powered, and the AC mains power is restored during the timing of the BMS, the BMS detects that the contact of the first intermediate relay KM1 changes from the open position to the closed position, stops timing and resets the current timing, and the closing control DO output port of the BMS controls the QF electric switch to close, and the load is automatically switched to the mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. In this embodiment, the BMS is used to stop timing and reset to zero when the digital input terminal detects that the first normally open contact changes from the open position to the closed position, and controls the electric switch of the DC circuit breaker to close; the BMS is also used to start timing when the digital input terminal detects that the first normally open contact changes from the closed position to the open position, and controls the electric switch of the DC circuit breaker to open after a preset period of time.

[0207] When the first energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM2 is energized and works, the first normally closed contact of KM3 is disconnected, and no power is taken from the battery of the backup power supply as backup power. When the AC mains power and the battery of the first energy storage cabinet lose power at the same time, the first solid-state relay KM2 loses power, and the first normally closed contact of KM2 closes. At this time, the battery of the backup power supply is used for power supply (when the AC mains power of the first energy storage cabinet loses power, the AC mains power of the backup power supply also loses power). The battery of the backup power supply will automatically disconnect after supplying power for a certain period of time, and the backup power supply battery provides the backup power time for the first energy storage cabinet to control, prevent the battery of the backup power supply from running out of power, improve the safety and reliability of the energy storage system, and extend the battery life.

[0208] The function of the first diode module DK is to isolate the power output of the first energy storage cabinet from the backup power output of the backup power supply to prevent the two power supplies from being connected in parallel, thereby avoiding repeated action of the first solid-state relay KM2.

[0209] It can be understood that the first intermediate relay KM1 can be replaced by a solid-state relay or a time relay to achieve the same function, and the details will not be repeated here.

[0210] Optionally, the first power conversion module also includes a working voltage protection unit, which is used to stop outputting direct current when the output voltage of the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than an undervoltage protection value of the energy storage cabinet battery.

[0211] The working voltage protection unit sets the lower limit value (voltage threshold) of the power supply working voltage at the DC / DC input end according to the capacity configuration of different batteries. The lower limit value can be slightly larger than the battery undervoltage protection value, that is, the first power conversion module stops output before the battery performs undervoltage protection, so as to prevent the battery from running out of power.

[0212] Optionally, a self-locking button is provided on the circuit where the positive output terminal of the first power conversion module is located, and the closing self-locking button is used to provide a black start function and an emergency shutdown function.

[0213] like Fig.15 As shown, the self-locking button SB2 is manually closed. The self-locking button SB2 is always closed under normal working conditions and is only used to disconnect or close the output circuit of the first power conversion module, control the disconnection and conduction of the output circuit of the first power conversion module, perform emergency control or maintenance, or perform a black start of part of the circuit.

[0214] It should be noted that if the capacity of a single contact of the relay does not meet the load current requirements, it can be expanded by connecting multiple contacts in parallel to meet the requirements. The contacts drawn in the attached figure do not represent a limit on the number of contacts. They can be selected according to actual needs, and there is no limit on the specific number.

[0215] When the AC mains of the first energy storage cabinet fails, the AC mains of the backup power supply also fails, and the battery of the backup power supply provides DC power; when the AC mains line of the first energy storage cabinet fails, the AC mains of the backup power supply is normal, and the AC mains of the backup power supply is converted into DC power for power supply.

[0216] It is also understandable that Fig.16 As shown, when the backup power supply of the first energy storage cabinet is the second energy storage cabinet, that is, the power control system includes the first energy storage cabinet and the second energy storage cabinet at the same time, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the structure of the second energy storage cabinet in the power control system can refer to Figure 8 The structure of the embodiment will not be described in detail here.

[0217] For example, Fig.16As shown, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS. Press the self-locking button SB2, manually close the DC circuit breaker QF, input the AC mains power supply and the battery at the same time, the output terminal of the second power conversion module SP2 outputs the target working voltage, the coil of the first intermediate relay KM1 is energized, and the first normally open contact corresponding to the first intermediate relay KM1 is closed. The DI of the BMS collects the signal that the first normally open contact changes from the open position to the closed position. At this time, the electric control of the DC circuit breaker QF is energized to prepare for the circuit breaker action, and the AC mains supplies power to the DC load. When the AC mains loses power, the battery of the second power conversion module SP2 supplies power to the DC load without delay switching. At the same time, the BMS detects the signal that the contact of the first intermediate relay KM1 changes from the closed position to the open position, and the BMS starts timing internally. After the preset time is reached, the BMS's opening control DO output port controls the QF electric control to open the gate, and the second power conversion module SP2 stops supplying power to the DC load, realizing the control of the battery backup time and preventing the battery from running out of power. If the battery of the second power conversion module SP2 is powered, and the AC mains power is restored during the timing of the BMS, the BMS detects that the contact of the first intermediate relay KM1 changes from the open position to the closed position, stops timing and resets the current timing, and the closing control DO output port of the BMS controls the QF electric switch to close, and the load is automatically switched to the mains power supply. When the AC power fails next time, the above process is repeated, and the cycle is repeated automatically. In this embodiment, the BMS is used to stop timing and reset to zero when the digital input terminal detects that the first normally open contact changes from the open position to the closed position, and controls the electric switch of the DC circuit breaker to close; the BMS is also used to start timing when the digital input terminal detects that the first normally open contact changes from the closed position to the open position, and controls the electric switch of the DC circuit breaker to open after a preset period of time.

[0218] When the second energy storage cabinet performs the above-mentioned dual power switching, the coil of the first solid-state relay KM2 is energized and works, the first normally closed contact of KM3 is disconnected, and no power is taken from the backup power supply as backup power. When the AC mains and battery of the second energy storage cabinet lose power at the same time, the first solid-state relay KM2 loses power, and the first normally closed contact of KM2 closes. At this time, the battery of the first energy storage cabinet is used for power supply. The battery of the first energy storage cabinet will automatically disconnect after supplying power for a period of time, controlling the backup power time provided by the battery of the first energy storage cabinet for the second energy storage cabinet, preventing the battery of the first energy storage cabinet from running out of power, improving the safety and reliability of the power control system, and extending the battery life.

[0219] Similarly, when the structures of the first energy storage cabinet and the second energy storage cabinet are the same, the working process of the second energy storage cabinet is similar to that of the first energy storage cabinet, except that the backup power supply of the second energy storage cabinet is provided by the first energy storage cabinet, and the backup power supply of the first energy storage cabinet is provided by the second energy storage cabinet, and other parts are the same. When there are a first energy storage cabinet and a second energy storage cabinet with the same structure, and the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, then their connection relationship is as follows: Fig.16 As shown. Under normal circumstances, the two energy storage cabinets (the first energy storage cabinet and the second energy storage cabinet) work independently and serve as backup for each other. The working principles of the two energy storage cabinets serving as backup for each other are the same. When the power supply of one energy storage cabinet fails, the power supply of the other energy storage cabinet serves as backup, and the backup time is controlled to prevent the battery from running out of power.

[0220] In the embodiment of the present application, during the switching process between the DC power supply and the AC power supply in the first energy storage cabinet, the backup power time of the battery in the first energy storage cabinet is set, which solves the problem that the battery in the first energy storage cabinet may be depleted, and at the same time ensures that when the AC mains power and the DC backup power of the first energy storage cabinet are simultaneously powered off, power is supplied through the second energy storage cabinet, and the backup power time of the second energy storage cabinet is set, so as to prevent the battery in the second energy storage cabinet from being depleted, and improve the reliability of the power control system.

[0221] It can also be understood that the specific structure between the first energy storage cabinet and the second energy storage cabinet can be the same or different, that is, the first local switching unit and the second local switching unit can be the same or different; the first external switching unit and the second external switching unit can be the same or different, and can be combined according to the local switching unit structure and the external switching unit structure provided in this embodiment and subsequent embodiments, and are not limited here. The specific structure of the second local switching unit can refer to the structure of the first local switching unit in any of the above embodiments, and the structure of the second external switching unit can also refer to the structure of the first external switching unit in any of the above embodiments.

[0222] The utility model also provides an energy storage system, comprising a power control system and an energy management system in any of the above embodiments, wherein the energy management system is used to perform energy management on batteries of each energy storage cabinet in the power control system.

[0223] In the utility model, a delayed protection function is provided for the battery in the dual power switching circuit of a single energy storage cabinet. During the switching process between the DC power supply and the AC power supply, the battery backup time is set by delaying the opening or closing of the relay contacts to control the length of time the battery supplies power to the load, thereby avoiding the problem of battery power loss caused by long-term battery backup and extending the battery life. At the same time, the uninterrupted switching between the AC power supply and the DC power supply ensures the reliability of the DC load power supply.

[0224] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A power supply control system, characterized in that: The power control system includes a first energy storage cabinet, and the first energy storage cabinet includes: a first power conversion module and a first power control module, wherein the first power control module includes at least one relay; The positive output terminal of the first power conversion module is connected to the positive electrode of the load through the contact of the at least one relay; The negative output terminal of the first power conversion module is connected to the negative electrode of the load; The first power control module is used to control the conduction time between the positive output terminal of the first power conversion module and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay; The first power conversion module has an AC input terminal and a DC input terminal. The AC input terminal is used to connect to the AC mains, and the DC input terminal is used to connect to the battery. The first power conversion module is used to convert the DC power output by the battery or the AC mains into DC power of a target working voltage.

2. The power supply control system according to claim 1, characterized in that: The first power supply control module includes a first power-off delay relay and a second power-off delay relay, the contact of the first power-off delay relay is a first delayed opening and closing contact, and the contact of the second power-off delay relay is a second delayed opening and closing contact; The two ends of the coil in the first power-off delay relay are respectively connected to the two AC input ends of the first power conversion module; The first end of the first delayed opening make contact is connected to the positive output end of the first power conversion module and the first end of the second delayed opening make contact, and the second end of the first delayed opening make contact is connected to the first end of the coil of the second power-off delay relay; The second end of the second delayed opening make contact is connected to the positive electrode of the load, and the second end of the coil of the second power-off delay relay is connected to the negative output end of the first power conversion module and the negative electrode of the load.

3. The power control system according to claim 1, characterized in that: The first power supply control module includes a first intermediate relay and a first time relay, and the contact of the first intermediate relay is a first normally open contact; Two ends of the coil in the first intermediate relay are respectively connected to two AC input ends of the first power conversion module; The first time relay comprises a first circuit input end, a second circuit input end, a third circuit input end and a first circuit output end; The first end of the first normally open contact is connected to the second loop input end and the positive output end of the first power conversion module; The second end of the first normally open contact is connected to the first loop input end; The third loop input end is connected to the negative output end of the first power conversion module and the negative pole of the load, and the first loop output end is connected to the positive pole of the load.

4. The power supply control system according to claim 1, characterized in that: The first power control module includes a battery management system BMS, a first intermediate relay and a second intermediate relay, the contact of the first intermediate relay is a first normally open contact, and the contact of the second intermediate relay is a first normally closed contact; Two ends of the coil of the first intermediate relay are respectively connected to two AC input ends of the first power conversion module; Both ends of the first normally open contact are connected to the digital input terminals of the BMS; The coil of the second intermediate relay is connected to the high-side digital output terminal of the BMS, and the output voltage of the high-side output terminal is the power supply voltage of the BMS; The first end of the first normally closed contact is connected to the positive output end of the first power conversion module, the second end of the first normally closed contact is connected to the positive pole of the load, and the negative output end of the first power conversion module is connected to the negative pole of the load.

5. The power control system according to claim 1, characterized in that: The first power control module includes a battery management system BMS, a DC circuit breaker and a first intermediate relay, and the contact of the first intermediate relay is a first normally open contact; Two ends of the coil of the first intermediate relay are respectively connected to two AC input ends of the first power conversion module; Both ends of the first normally open contact are connected to the digital input terminals of the BMS; The positive output terminal of the first power conversion module is connected to the positive pole of the load after passing through the DC circuit breaker, and the negative output terminal of the first power conversion module is connected to the negative pole of the load after passing through the DC circuit breaker.

6. The power supply control system according to any one of claims 1 to 5, characterized in that: The first power conversion module includes a working voltage protection unit, which is used to stop outputting DC power when the input voltage of the two DC input terminals in the first power conversion module is less than a voltage threshold, and the voltage threshold is greater than the undervoltage protection value of the battery.

7. The power supply control system according to any one of claims 1 to 5, characterized in that: A self-locking button is provided on the loop where the positive output terminal of the first power conversion module is located, and the self-locking button is used to provide a black start function and an emergency shutdown function.

8. The power control system according to claim 1, characterized in that: The power control system further includes a backup power supply, and the first energy storage cabinet further includes: a first diode module and a second power control module; The positive output terminal of the first power conversion module is connected to the first input terminal of the first diode module through the contact of the at least one relay; the second input terminal of the first diode module is connected to the positive output terminal of the second power control module, and the output terminal of the first diode module is connected to the positive electrode of the load; The negative output terminal of the first power conversion module is connected to the negative output terminal of the second power control module and the negative electrode of the load; The second power supply control module is used to control the conduction time between the positive output terminal of the backup power supply and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay; The first diode module is used to provide the direct current output by the first power conversion module or the direct current output by the backup power supply to the positive electrode of the load.

9. The power supply control system according to claim 8, characterized in that: The first power supply control module includes a first power-off delay relay, the contact of which is a first delayed-off make contact, the second power supply control module includes an energy storage capacitor, a first power-on delay relay and a first intermediate relay, the contact of which is a first delayed-off make contact, and the contact of the first intermediate relay is a first normally closed contact; The two ends of the coil in the first power-off delay relay are respectively connected to the two AC input ends of the first power conversion module; The first end of the first delayed opening make contact is connected to the positive output end of the first power conversion module, and the second end of the first delayed opening make contact is connected to the first end of the coil of the first intermediate relay, the first end of the energy storage capacitor, and the first input end of the first diode module; The negative output terminal of the first power conversion module is connected to the negative output terminal of the backup power supply, the second end of the first intermediate relay, the second end of the energy storage capacitor, the second end of the coil of the first power-on delay relay, and the negative electrode of the load; The first end of the coil in the first power-on delay relay is connected to the second end of the first normally closed contact and the first end of the first delayed opening break contact; The second end of the first delayed-off break contact is connected to the second input end of the first diode module; The first end of the first normally closed contact is connected to the positive output end of the backup power supply.

10. The power supply control system according to claim 8, characterized in that: The first power supply control module includes a first power-off delay relay and a second power-off delay relay, the contact of the first power-off delay relay is a first delayed opening and closing contact, and the contact of the second power-off delay relay is a second delayed opening and closing contact; The second power supply control module includes a first solid-state relay, and the contact of the first solid-state relay is a first normally closed contact; The two ends of the coil in the first power-off delay relay are respectively connected to the two AC input ends of the first power conversion module; The first end of the first delayed opening make contact is connected to the positive output end of the first power conversion module and the first end of the second delayed opening make contact, and the second end of the first delayed opening make contact is connected to the first end of the coil of the second power-off delay relay; The second end of the second delayed-off make contact is connected to the first end of the coil of the first solid-state relay, the first input end of the first diode module, and the normally closed contact of the backup power supply; The negative output terminal of the first power conversion module, the second end of the coil of the second power-off delay relay, the second end of the coil of the first solid-state relay, the negative output terminal of the backup power supply, and the negative electrode of the load are connected; The second input end of the first diode module is connected to the positive output end of the backup power supply through a first normally closed contact, and the output end of the first diode module is connected to the positive electrode of the load.

11. The power control system according to claim 8, characterized in that: The first power supply control module includes a first intermediate relay and a first time relay, and the contact of the first intermediate relay is a first normally open contact; the second power supply control module includes a first solid-state relay, and the contact of the first solid-state relay is a first normally closed contact; Two ends of the coil in the first intermediate relay are respectively connected to two AC input ends of the first power conversion module; The first time relay comprises a first circuit input end, a second circuit input end, a third circuit input end and a first circuit output end; The first end of the first normally open contact is connected to the second loop input end and the positive output end of the first power conversion module; The second end of the first normally open contact is connected to the first loop input end; The third loop input end is connected to the negative output end of the first power conversion module, the negative output end of the backup power supply, and the negative pole of the load; The first loop output end is connected to the first end of the coil of the first solid-state relay and the first input end of the first diode module; The second input end of the first diode module is connected to the positive output end of the backup power supply through a first normally closed contact, and the output end of the first diode module is connected to the positive electrode of the load.

12. The power control system according to claim 8, characterized in that: The first power control module includes a battery management system BMS, a first intermediate relay and a second intermediate relay, the contact of the first intermediate relay is a first normally open contact, and the contact of the second intermediate relay is a first normally closed contact; the second power control module includes a first solid-state relay, and the contact of the first solid-state relay is a second normally closed contact; Two ends of the coil in the first intermediate relay are respectively connected to two AC input ends of the first power conversion module; Both ends of the first normally open contact are connected to the digital input terminals of the BMS; The coil of the second intermediate relay is connected to the high-side digital output terminal of the BMS, and the output voltage of the high-side output terminal is the power supply voltage of the BMS; The first end of the first normally closed contact is connected to the positive output end of the first power conversion module, and the second end of the first normally closed contact is connected to the first end of the coil of the first solid-state relay, the first input end of the first diode module, and the positive output end of the backup power supply; The negative output terminal of the first power conversion module is connected to the second end of the coil in the first solid-state relay, the negative output terminal of the backup power supply, and the negative electrode of the load; The second input end of the first diode module is connected to the positive output end of the backup power supply through a second normally closed contact, and the output end of the first diode module is connected to the positive electrode of the load.

13. The power control system according to claim 8, characterized in that: The first power control module includes a battery management system BMS, a first intermediate relay and a DC circuit breaker, and the contact of the first intermediate relay is a first normally open contact; the second power control module includes a first solid-state relay, and the contact of the first solid-state relay is a first normally closed contact; Two ends of the coil in the first intermediate relay are respectively connected to two AC input ends of the first power conversion module; Both ends of the first normally open contact are connected to the digital input terminals of the BMS; The positive output end of the first power conversion module is connected to the first end of the coil of the first solid-state relay, the first input end of the first diode module, and the positive output end of the backup power supply after passing through the DC circuit breaker; The negative output terminal of the first power conversion module is connected to the second end of the coil of the first solid-state relay, the negative output terminal of the backup power supply, and the negative electrode of the load after passing through the DC circuit breaker; The second input end of the first diode module is connected to the positive output end of the backup power supply through a first normally closed contact, and the output end of the first diode module is connected to the positive electrode of the load.

14. The power supply control system according to any one of claims 8 to 13, characterized in that: The backup power source of the first energy storage cabinet is the second energy storage cabinet, the first energy storage cabinet and the second energy storage cabinet serve as backup power for each other, and the second energy storage cabinet includes: A second power conversion module, a third power control module, a fourth power control module and a second diode module, wherein the third power control module includes at least one relay, and the fourth power control module includes at least one relay; The positive output terminal of the second power conversion module is connected to the first input terminal of the second diode module through the contact of the at least one relay; the second input terminal of the second diode module is connected to the positive output terminal of the fourth power control module, and the output terminal of the second diode module is connected to the positive electrode of the load; The negative output terminal of the second power conversion module is connected to the negative output terminal of the fourth power control module and the negative electrode of the load; The third power control module is used to control the conduction time between the positive output terminal of the second power conversion module and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay; The fourth power supply control module is used to control the conduction time between the positive output terminal of the first energy storage cabinet and the positive electrode of the load by delaying the opening or closing of the corresponding contacts of each relay; The second diode module is used to provide the direct current output by the second power conversion module or the direct current output by the first energy storage cabinet to the positive electrode of the load; The second power conversion module has an AC input terminal and a DC input terminal. The AC input terminal is used to connect to the AC mains, and the DC input terminal is used to connect to the battery. The second power conversion module is used to convert the DC power output by the battery or the AC mains into DC power of the target working voltage.

15. An energy storage system, characterized in that: It comprises a plurality of power control systems and energy management systems as described in any one of claims 1 to 14, wherein the energy management system is used to perform energy management on batteries of each energy storage cabinet in the power control system.

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