Energy storage power supply system

Abstract

The utility model relates to an energy storage power supply system which comprises an alternating current power supply module and a direct current power supply module which are connected with a controller, the output ends of the alternating current power supply module and the direct current power supply module are connected with each other, and the output ends output direct current voltage for power supply; the input end of the AC power supply module is connected with a power grid and used for converting AC voltage input by the power grid into first DC voltage. The input end of the direct-current power supply module is connected with the direct-current input end of the energy storage system, and is used for converting a second direct-current voltage input by the direct-current input end into a first direct-current voltage under the condition that the power grid is disconnected; and the controller is used for sampling the working parameters of the direct-current power supply module to obtain corresponding sampling signals, and outputting corresponding power regulation signals to the direct-current power supply module based on the sampling signals, so that the problem that the power supply cost is too high when the power grid is powered off through the UPS is solved.

Description

Technical Field

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

[0002] In the grid-connected working scenario, the power supply of the energy storage system is 220V alternating current input from the grid; in the off-grid scenario, an uninterruptible power supply (UPS) system is usually used to provide alternating current power, and then through AC-DC conversion to provide direct current power (DC 24V) for the energy storage system. However, the cost of the UPS system is relatively high, and the UPS system in high-power applications is even more expensive. Therefore, usually the UPS is mainly responsible for providing short-term power support when the grid power is cut off, and there is a problem of too high cost in long-term power supply requirements. Summary of the Utility Model

[0003] In view of this, it is necessary to provide an energy storage power supply system to solve the problem of too high cost of power supply through the UPS when the grid power is cut off in the prior art.

[0004] In a first aspect, in this embodiment, an energy storage power supply system is provided. The energy storage power supply system includes an AC power module and a DC power module connected to a controller. The AC power module and the DC power module are connected to each other at the output end, and the output end outputs a DC voltage for power supply.

[0005] The input end of the AC power module is connected to the grid and is used to convert the AC voltage input from the grid into a first DC voltage.

[0006] The input end of the DC power module is connected to the DC input end of the energy storage system and is used to convert the second DC voltage input from the DC input end into the first DC voltage when the grid is disconnected.

[0007] The controller is used to sample the working parameters of the DC power module to obtain corresponding sampling signals, and output corresponding power adjustment signals to the DC power module based on the sampling signals. In a further embodiment, the AC power module includes a first power conversion circuit and a fault isolation circuit connected to the first power conversion circuit.

[0008] The DC power module includes a second power conversion circuit and the fault isolation circuit connected to the second power conversion circuit.

[0009] The controller is connected to the first power conversion circuit and the second power conversion circuit, receives the sampling signals sent by the first power conversion circuit and the second power conversion circuit, and obtains corresponding working parameters based on the sampling signals. The working parameters include current, voltage and temperature.

[0010] In a further embodiment, the fault isolation circuit includes a short-circuit protection circuit,

[0011] The short-circuit protection circuit controls the disconnection or restoration of conduction between the input terminal and the output terminal of the AC power supply module according to the current sampling signal of the first power conversion circuit; and controls the disconnection or restoration of conduction between the input terminal and the output terminal of the DC power supply module according to the current sampling signal of the second power conversion circuit.

[0012] In a further embodiment, the fault isolation circuit includes an overvoltage protection circuit,

[0013] The overvoltage protection circuit is configured to control the disconnection or restoration of conduction between the input terminal and the output terminal of the AC power supply module according to the output voltage of the first power conversion circuit; and control the disconnection or restoration of conduction between the input terminal and the output terminal of the DC power supply module according to the output voltage of the second power conversion circuit.

[0014] In a further embodiment, the overvoltage protection circuit includes a surge protector and a fuse connected to each other.

[0015] In a further embodiment, the second power conversion circuit includes a multi-stage buck sub-circuit, and the multi-stage buck sub-circuit is configured to convert the second DC voltage into the first DC voltage and at least one DC voltage different from the first DC voltage.

[0016] In a further embodiment, the fault isolation circuit further includes an anti-backflow circuit, and the anti-backflow circuit is respectively connected to the output terminals of the first power conversion circuit and the second power conversion circuit.

[0017] In a further embodiment, the energy storage power supply system further includes a DC filter circuit, and the DC filter circuit is connected to the output terminals of the AC power supply module and the DC power supply module to filter the first DC voltage output by the AC power supply module or the DC power supply module.

[0018] The energy storage power supply system of the present utility model provides a dual-redundancy backup power supply through the AC power supply module and the DC power supply module connected to each other at the output terminal; converts the AC voltage input from the power grid into the first DC voltage through the AC power supply module to provide a power supply under the grid-connected state; converts the second DC voltage input from the DC input terminal of the energy storage system into the first DC voltage through the DC power supply module to provide a power supply under the off-grid state, samples the working parameters of the DC power supply module through the controller, and outputs a corresponding power adjustment signal to the DC power supply module based on the sampling signal, solving the problem of too high cost of power supply through the UPS when the power grid is powered off and improving the power conversion efficiency of the DC power supply. Description of the Drawings

[0019] Figure 1 It is a schematic connection diagram of an energy storage power supply system and a controller according to some embodiments of the present application;

[0020] Figure 2 It is a schematic connection diagram of an energy storage power supply system and a controller according to some other embodiments of the present application;

[0021] Figure 3 It is a schematic structural diagram of an energy storage power supply system according to some embodiments of the present application;

[0022] Figure 4 It is a schematic structural diagram of an energy storage power supply system according to some other embodiments of the present application;

[0023] Figure 5 It is a schematic structural diagram of an energy storage power supply system according to some other embodiments of the present application. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. "First" and "second" are only for the distinction of component names and do not indicate order.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Among them, the embodiments of the present utility model are described in detail in conjunction with the schematic diagrams, and the schematic diagrams are only examples and should not limit the protection scope of the present utility model herein.

[0028] The following will further describe in detail the energy storage power supply system provided by the embodiments of the present utility model with reference to the accompanying drawings.

[0029] Please refer to Figure 1 As shown, it is a schematic connection diagram of the energy storage power supply system and the controller in some embodiments of the present application. The energy storage power supply system includes an AC power supply module 20 and a DC power supply module 30 connected to the controller 10. The AC power supply module 20 and the DC power supply module 30 are connected to each other at the output end, and a DC voltage is output at the output end and supplied to the outside.

[0030] The input end of the AC power supply module 20 is connected to the power grid and is used to convert the AC voltage Vin-ac input by the power grid into a first DC voltage Vout; the input end of the DC power supply module 30 is connected to the DC input end of the energy storage system and is used to convert the second DC voltage Vin-dc input at the DC input end into the first DC voltage Vout when the power grid is disconnected. The controller 10 is used to sample the operating parameters of the DC power supply module 30 to obtain a corresponding sampling signal S1, and output a corresponding power adjustment signal S2 to the DC power supply module 30 based on the sampling signal S1 to control the DC power supply module 30 to be optimally efficient.

[0031] Specifically, the AC power supply module 20 can be a switching power supply with AC-DC conversion function, and the DC power supply module 30 can be a switching power supply with DC-DC conversion function. Among them, the AC power supply module 20 and the DC power supply module 30 can include circuits with current, voltage, and temperature sampling functions. The sampling circuit can obtain the sampling signal and send it to the controller 10. The circuit topology of the switching power supply is not limited in this embodiment.

[0032] Specifically, the controller 10 can be a device with data processing functions such as CPU, MCU, FPGA, DSP, etc. The controller 10 can be arranged in other devices outside the energy storage power supply system. After receiving the sampling signal of the DC power supply module 30, the controller 10 can output a corresponding power adjustment signal according to the sampling signal. This power adjustment signal can stabilize the output first DC voltage Vout within a preset range when the input voltage or load of the DC power supply module 30 changes, and can adjust the operating parameters of the DC power supply module 30 in real time according to the sampling signal through the PID algorithm to make the DC power supply module 30 optimally efficient and improve the power conversion efficiency.

[0033] In a further embodiment, the energy storage power supply system further includes an interface board connected to external devices of the energy storage system. The external devices of the energy storage system may include sensing devices such as smoke sensors, temperature sensors, water immersion sensors, access control, etc., and control devices such as buzzers, indicator lights, fans, fire alarms, etc. for controlling the working state of the energy storage system. These external devices are connected to the control device of the energy storage system through the interface board to realize communication between the control device and the external devices.

[0034] The interface board may include various types of interfaces, including signal interfaces, power interfaces, communication interfaces, etc. All connection points on the interface board are in a welding manner, reducing the problem of poor contact in traditional terminal blocks. The selection of various interfaces of the interface board can be a standardized model to ensure interface compatibility and scalability in different application scenarios. And the interface board is a detachable stacking design, enabling different types of interfaces to be conveniently stacked and disassembled. Each interface channel on the interface board has a corresponding identification, facilitating quick identification and operation during installation and maintenance.

[0035] The energy storage power supply system of this embodiment provides a dual-redundancy backup power supply through an AC power module and a DC power module connected to each other at the output end; converts the AC voltage input from the power grid into a first DC voltage through the AC power module to provide a power supply in the grid-connected state; converts the second DC voltage input at the DC input end of the energy storage system into a first DC voltage through the DC power module to provide a power supply in the off-grid state, samples the working parameters of the DC power module through the controller, and outputs a corresponding power adjustment signal to the DC power module based on the sampling signal to control the optimal efficiency of the DC power module, solving the problem of too high cost of supplying power through the UPS when the power grid is powered off and improving the power conversion efficiency of the DC power supply.

[0036] In some embodiments, Figure 2 is a schematic connection diagram of the energy storage power supply system and the controller in some other embodiments of the present application, as Figure 2 shown, the AC power module 20 includes a first power conversion circuit 22 and a fault isolation circuit 210 connected to the first power conversion circuit 22; the DC power module 30 includes a second power conversion circuit 32 and a fault isolation circuit 210 connected to the second power conversion circuit 32. The controller 10 is connected to the first power conversion circuit 22 and the second power conversion circuit 32, receives the sampling signal S3 sent by the first power conversion circuit 22 and the sampling signal S1 sent by the second power conversion circuit 32, and obtains corresponding working parameters based on the sampling signals S1 and S3. The working parameters include current, voltage, and temperature.

[0037] Specifically, the sampling signals S1 and S3 can be analog signals or digital signals. The sampling signals S1 and S3 can transmit the current, voltage, and temperature information of the first power conversion circuit 22 or the second power conversion circuit 32 to the controller 10 in one go, or can be transmitted separately through different transmission channels. The transmission channel can be a directly connected signal line or a communication bus based on various communication protocols, which is not limited in this embodiment. If it is an analog signal, the controller 10 can convert it into a digital signal through an analog-to-digital conversion circuit and then process it to obtain the current, voltage, and temperature information corresponding to the two power conversion circuits. The fault isolation circuit 210 is used to isolate and protect the first power conversion circuit 22 and the second power conversion circuit 32.

[0038] In some embodiments, Figure 3 is a schematic structural diagram of an energy storage power supply system according to some embodiments of the present application, as Figure 3 shown, the fault isolation circuit includes a short-circuit protection circuit 21. The short-circuit protection circuit 21 controls the disconnection or restoration of conduction between the input end and the output end of the AC power supply module 20 according to the current sampling signal of the first power conversion circuit 22; and controls the disconnection or restoration of conduction between the input end and the output end of the DC power supply module 30 according to the current sampling signal of the second power conversion circuit 32.

[0039] When the input currents of the first power conversion circuit 22 and the second power conversion circuit 32 are greater than the preset threshold of the short-circuit protection circuit 21, the short-circuit protection circuit 21 cuts off the power supply circuit to protect the subsequent circuits of the energy storage system and prevent the components in the subsequent circuits from being damaged due to excessive current. The reason for excessive current may be that the circuit wiring is short-circuited or the power supply signal input at the input end is abnormal.

[0040] Specifically, the short-circuit protection circuit 21 can include a circuit breaker. A circuit breaker is a reusable protection device. When it is determined through the current sampling signal that the current of the first power conversion circuit 22 or the second power conversion circuit 32 is greater than the safety threshold of the circuit breaker, the circuit breaker automatically cuts off the connection between the input end and the output end. When the current is normal, the conduction can be restored manually or automatically.

[0041] Furthermore, the short-circuit protection circuit 21 can include intelligent protection devices. The intelligent protection devices can dynamically adjust the protection parameters according to the actual operating conditions, improve the adaptability of the short-circuit protection circuit, and ensure the safe operation of the energy storage power supply system.

[0042] In some embodiments, Figure 4 is a schematic structural diagram of an energy storage power supply system according to other embodiments of the present application, as Figure 4As shown, the fault isolation circuit further includes an overvoltage protection circuit 23. The overvoltage protection circuit 23 is used to control the disconnection or restoration of conduction between the input terminal and the output terminal of the AC power supply module 20 according to the output voltage of the first power conversion circuit 22; and to control the disconnection or restoration of conduction between the input terminal and the output terminal of the DC power supply module 30 according to the output voltage of the second power conversion circuit 32.

[0043] Specifically, the overvoltage protection circuit 23 may include a surge protector and a fuse that are connected to each other.

[0044] The surge protector has a protective effect of preventing damage to devices caused by sudden instantaneous high voltages or instantaneous high currents in the circuit. The reasons for instantaneous high voltages or instantaneous high currents may be lightning strikes, power supply switching, or the startup of high-energy loads, etc. The surge protector can be a single device such as a bidirectional transient voltage suppressor (TVS), a varistor, etc., or a surge protection circuit composed of multiple devices.

[0045] In some embodiments, the surge protector includes a switching device. When the output voltage passing through the surge protector is greater than the safety threshold of the surge protector, the switching device in the surge protector operates to cut off the connection between the input terminal and the output terminal and restore conduction after the voltage returns to normal. In other embodiments, when the output voltage passing through the surge protector is greater than the safety threshold of the surge protector, the surge protector only clamps the transient change of the output voltage and absorbs energy, and can also achieve the purpose of quickly absorbing overvoltage, protecting the subsequent circuit, and avoiding device damage.

[0046] The fuse plays a role in overcurrent protection. When the current passing through the fuse exceeds the preset fusing threshold, the fuse melts to disconnect the power supply and protect the subsequent circuit, enhancing the breaking capacity during overcurrent.

[0047] In some embodiments, Figure 5 is a schematic structural diagram of an energy storage power supply system according to still other embodiments of the present application. As Figure 5 shown, the fault isolation circuit further includes a reverse current prevention circuit 24. The reverse current prevention circuit 24 is respectively connected to the output terminals of the first power conversion circuit 22 and the second power conversion circuit 32.

[0048] When the AC power supply module 20 outputs a first DC voltage, the reverse current prevention circuit 24 can prevent the first DC voltage from flowing back to the DC power supply module 30; conversely, when the DC power supply module 30 outputs a first DC voltage, the reverse current prevention circuit 24 can prevent the first DC voltage from flowing back to the AC power supply module 20. Specifically, the reverse current prevention circuit 24 may include a diode.

[0049] In some embodiments, the second power conversion circuit 32 includes a multi-stage buck sub-circuit for converting the second DC voltage Vin-dc into a first DC voltage Vout and at least one DC voltage different from the first DC voltage Vout.

[0050] The control device of the energy storage system and external devices usually use multiple DC voltages, such as +24V, +12V, +5V, etc. On the basis of the energy storage power supply system realizing the output of the first DC voltage Vout in the second power conversion circuit 32, it can further provide power supply signals of multiple voltage levels. In some embodiments, the first DC voltage Vout is +24V, and +24V is used as the input signal of the multi-stage buck sub-circuit to output DC voltage signals such as +12V and +5V. In other embodiments, the second DC voltage Vin-dc is used as the input signal of the multi-stage buck sub-circuit to directly output power supply signals of multiple voltage levels to provide the required power supply voltage for the control device of the energy storage system and external devices.

[0051] In a further embodiment, the energy storage power supply system further includes a DC filter circuit connected to the output terminals of the AC power module 20 and the DC power module 30 to filter the first DC voltage output by the AC power module 20 or the DC power module 30, remove noise, and improve the signal quality of the output voltage. The DC filter circuit may include capacitors and inductors.

[0052] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combinations of these technical features do not conflict, they should be considered as within the scope described in this specification.

[0053] The above-described embodiments merely represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An energy storage power supply system, characterized in that, The energy storage power supply system includes an AC power supply module and a DC power supply module connected to a controller. The AC power supply module and the DC power supply module are interconnected at the output end, and a DC voltage is output at the output end for power supply. The input end of the AC power supply module is connected to the power grid and is used to convert the AC voltage input by the power grid into a first DC voltage. The input end of the DC power supply module is connected to the DC input end of the energy storage system and is used to convert the second DC voltage input at the DC input end into the first DC voltage when the power grid is disconnected. The controller is used to sample the operating parameters of the DC power supply module to obtain corresponding sampling signals, and based on the sampling signals, output corresponding power adjustment signals to the DC power supply module.

2. The energy storage power supply system according to claim 1, wherein the AC power supply module includes a first power conversion circuit and a fault isolation circuit connected to the first power conversion circuit; the DC power supply module includes a second power conversion circuit and the fault isolation circuit connected to the second power conversion circuit; the controller is connected to the first power conversion circuit and the second power conversion circuit, receives the sampling signals sent by the first power conversion circuit and the second power conversion circuit, and obtains corresponding operating parameters based on the sampling signals. The operating parameters include current, voltage, and temperature.

3. The energy storage power supply system according to claim 2, characterized in that The fault isolation circuit includes a short-circuit protection circuit. The short-circuit protection circuit controls the disconnection or restoration of conduction between the input end and the output end of the AC power supply module according to the current sampling signal of the first power conversion circuit; and controls the disconnection or restoration of conduction between the input end and the output end of the DC power supply module according to the current sampling signal of the second power conversion circuit.

4. The energy storage power supply system according to claim 2, wherein The fault isolation circuit includes an overvoltage protection circuit. The overvoltage protection circuit is used to control the disconnection or restoration of conduction between the input end and the output end of the AC power supply module according to the output voltage of the first power conversion circuit; and controls the disconnection or restoration of conduction between the input end and the output end of the DC power supply module according to the output voltage of the second power conversion circuit.

5. The energy storage power supply system according to claim 4, wherein The overvoltage protection circuit includes a surge protector and a fuse connected to each other.

6. The energy storage power supply system according to claim 2, wherein The second power conversion circuit includes a multi-stage step-down sub-circuit, which is used to convert the second DC voltage into the first DC voltage and at least one DC voltage different from the first DC voltage.

7. The energy storage power supply system according to claim 2, wherein The fault isolation circuit further includes an anti-backflow circuit, and the anti-backflow circuit is respectively connected to the output ends of the first power conversion circuit and the second power conversion circuit.

8. The energy storage power supply system according to claim 1, wherein, The energy storage power supply system further includes a DC filter circuit, and the DC filter circuit is connected to the output ends of the AC power supply module and the DC power supply module to filter the first DC voltage output by the AC power supply module or the DC power supply module.

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