Array DC power supply system and management method

Abstract

The present invention discloses an array-type DC power supply system and a management method, including: an integrated parallel DC power supply unit, the integrated parallel DC power supply unit having a power input end, a DC output end and a battery, the battery being isolated from the power input end and the DC output end, a plurality of the integrated parallel DC power supply units being connected in parallel to form a system, and the batteries of each of the integrated parallel DC power supply units being isolated from each other; an edge management terminal module, the edge management terminal module being electrically connected to the integrated parallel DC power supply unit. Through the edge management terminal, by using distributed thinking technology, from the system architecture and the array-type innovation management method, the power supply reliability of the DC power supply system is improved, and the maintenance-free design of the DC power supply system is realized; the service life of the storage battery is effectively extended, and each storage battery can be used until the end of its life, improving the utilization rate of the storage battery; the system realizes the working mode of the array-type management module through the edge management terminal, and at the same time realizes the peak shaving and valley filling of energy use, contributing to carbon emission reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of DC power supply systems, and particularly to an array-type DC power supply system and a management method thereof. Background Art

[0002] Currently, a commonly used DC power supply system is configured with several rectifier modules, a set of battery packs, and a battery inspection unit. The input end of the rectifier module is an AC power supply (AC220) or a DC power supply (DC110 - 400V). The output end of the rectifier module is DC power, which is connected in parallel with the battery pack to form a DC power supply system with a rated voltage of 240 / 220 / 110 / 48V. The battery pack is composed of several 2V lead-acid batteries connected in series. When the system is operating normally, the rectifier module charges the battery pack and supplies power to the load at the same time. The battery pack charges or discharges simultaneously during operation.

[0003] Deficiencies of the system: 1. When the power supply at the input end of the system is in a normal state, the battery pack is in a floating charge state, and it is difficult to diagnose the health status of a single battery with existing technical means. 2. If there is an open circuit abnormality in a single battery, the battery pack will reach the charging set voltage value in a short time during charging, resulting in the battery pack not reaching the full capacity state. If the power supply at the input end of the system is powered off at this time, the DC total output port voltage will drop sharply to 0, causing the system to lose power. 3. If there are internal abnormalities in some batteries, the internal impedance of the battery will tend to change to a smaller value compared to normal at this time. The impedance change is a gradual process, and the system cannot detect it in advance, resulting in overcharging of some batteries in the battery pack and accelerating the damage of other batteries. 4. Since each single battery in the system is connected in series to form a DC bus, its output voltage is high, and it is impossible to replace a single abnormal battery online. After connecting a corresponding number of backup battery packs, the battery pack needs to be withdrawn before the corresponding replacement operation can be carried out. The entire replacement process is complicated. 5. After some batteries in the system are abnormal, the entire group is usually replaced. When the entire group is replaced, the good batteries inside are also eliminated together, resulting in low utilization rate of the batteries, wasting resources, and at the same time causing the life of the entire group not to reach the design expectation, and it is impossible to use each battery until the end of its life. The schematic diagram of a conventional operation power supply system is as Figure 3 . Summary of the Invention

[0004] The main purpose of the present invention is to provide an array-type DC power supply system, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is:

[0006] An array-type DC power supply system, comprising:

[0007] Integrated parallel DC power supply unit, the integrated parallel DC power supply unit having a power input terminal, a DC output terminal and a battery, the battery being isolated from the power input terminal and the DC output terminal, and a plurality of the integrated parallel DC power supply units being connected in parallel to form a system, with the batteries of each of the integrated parallel DC power supply units being isolated from each other;

[0008] Edge management terminal module, the edge management terminal module being electrically connected to the integrated parallel DC power supply unit;

[0009] Isolate the battery from the DC bus output terminal and the power input terminal, and isolate the battery from each other among the batteries in the system;

[0010] Charge the built-in battery and at the same time output to the DC bus;

[0011] When the front-end DC bus is normal, the output voltage value of the output buck DC / DC converter is lower than that of the output DC / DC converter and is in the standby state;

[0012] When the front-end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same as that of the output buck DC / DC converter, the output buck DC / DC immediately takes over, ensuring uninterrupted module output and ensuring the power supply reliability of the system;

[0013] When the outlet of the system feeder switch is short-circuited and the module needs to output a large current for a short time to drive the feeder switch to trip, the intelligent management unit controls through the current sharing unit to make the output DC / DC module and the output buck DC / DC module jointly bear the large current output;

[0014] The edge management terminal is provided with a set number / single module core capacity cycle. When the set cycle is reached, it detects whether the DC bus is normal at this time, detects whether the system bus current meets the minimum core capacity load, whether all batteries are in the intermittent charging state, and whether there are no other faults and alarm information in the integrated parallel DC unit, and issues an instruction to the intelligent management unit of multiple integrated parallel DC units. If all are satisfied at the same time, multiple modules simultaneously start the corresponding core capacity logic. First, turn off the AC / DC module, exit the system current sharing through the control of the current sharing unit, at the same time turn off the buck DC / DC module, and at the same time the output buck DC / DC module starts to adjust the output voltage, so that the integrated parallel DC unit to be core-capacitated realizes energy bearing provided by the battery, and the output voltage is adjusted to maintain the battery terminal discharge current to the preset value until the battery termination discharge voltage point or until 10 hours to complete the core capacity operation. During the entire core capacity process, the intelligent management unit immediately uploads the core capacity data to the edge management terminal;

[0015] The edge management terminal is set with a single module capacitance checking period. When the set period is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance checking, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. If all are met, it sends a command to the intelligent management units of all integrated parallel DC units, starting from the module with the lowest serial number one by one. The single module activates the corresponding capacitance checking logic. First, it turns off the AC / DC module, exits the system current sharing by controlling the current sharing unit, and at the same time turns off the step-down DC / DC module. Meanwhile, the output step-down DC / DC module starts to adjust the output voltage so that the integrated parallel DC unit to be capacitance-checked realizes energy supply by the battery, and the output voltage is adjusted until the battery terminal discharge current is maintained at the preset value until the battery termination discharge voltage point or 10 hours of capacitance checking operation is completed. During the entire capacitance checking process, the intelligent management unit immediately uploads the capacitance checking data to the edge management terminal;

[0016] When the edge management terminal receives the capacitance checking command sent from the background, it detects whether the system bus current meets the minimum load for capacitance checking, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. The edge management terminal sends the capacitance checking command to the intelligent management units of one or more specified integrated parallel DC units. After receiving the command, the intelligent management unit detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance checking, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter;

[0017] When the edge management terminal of the system fails in function / communication and the previously set period is reached, the intelligent management unit of the integrated parallel DC unit with the lowest communication address uses CAN communication to detect whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance checking, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter. If all are met, the edge management terminal module activates the corresponding capacitance checking logic for a single integrated parallel DC unit simultaneously / one by one;

[0018] When the capacitance checking termination condition is reached, the intelligent management unit activates the AC / DC module, restores the DC400V bus, ensures that the integrated parallel DC unit can guarantee uninterrupted output when switching from energy supply by the battery to AC power supply, turns on the step-down DC / DC module to achieve constant current charging, and immediately enables the current sharing unit to restore the normal current sharing logic to be carried by the output DC / DC module. After the charging state becomes intermittent, the intelligent management unit stops sending capacitance checking data and completes the capacitance checking operation of a single integrated parallel DC unit.

[0019] Further, the edge management terminal module is signal - connected to multiple of the integrated parallel DC power supply units through CAN communication to perform remote control, remote adjustment, remote measurement, and remote signaling operations on the modules, and record the data information of each unit.

[0020] Further, the input end of the battery is connected to the output end of the buck DC / DC module, the input end of the buck DC / DC module is connected to the output end of the AC / DC module, and the input end of the AC / DC module is connected to the power input end.

[0021] Further, the output end of the battery is electrically connected to the input end of the voltage - open - loop boost DC / DC module, the output end of the voltage - open - loop boost DC / DC module is electrically connected to the input ends of the output buck DC / DC module and the output DC / DC module, and the output ends of the output buck DC / DC module and the output DC / DC module are connected to the output bus.

[0022] Further, it further includes an intelligent management unit, a CAN communication unit, and a current - sharing unit. The CAN communication unit is connected to the AC / DC module and the intelligent management unit, and the intelligent management unit is connected to the current - sharing unit, the output DC / DC module, the buck DC / DC module, the voltage - open - loop boost DC / DC module, and the output buck DC / DC module.

[0023] Further, the current - sharing unit is connected to the output buck DC / DC module and the output DC / DC module.

[0024] Further, it further includes a DC feeder distribution unit, and the DC feeder distribution unit is electrically connected to the integrated parallel DC power supply unit.

[0025] Based on the above - mentioned array - type DC power supply system, the array - type DC power supply management method includes the following steps:

[0026] Isolate the battery from the DC bus output end and the power input end, and isolate each battery in the system from each other;

[0027] Charge the built - in battery and output to the DC bus at the same time;

[0028] When the front - end DC bus is normal, the output voltage value of the output buck DC / DC converter is lower than that of the output DC / DC converter and is in a standby state;

[0029] When the front - end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same as that of the output buck DC / DC converter, the output buck DC / DC immediately takes over to ensure uninterrupted module output and the power supply reliability of the system;

[0030] When a short circuit occurs at the outlet of the system feeder switch and the module needs to output a large current for a short time to drive the feeder switch to trip, the intelligent management unit controls through the current sharing unit so that the output DC / DC module and the output step-down DC / DC module jointly undertake the large current output.

[0031] Furthermore, the following steps are also included:

[0032] The edge management terminal is provided with multiple / single set module capacitive test cycles. When the set cycle is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum capacitive test load, whether all batteries are in the intermittent charging state, and whether there are no other faults and alarm messages in the integrated parallel DC unit. It issues commands to the intelligent management units of multiple integrated parallel DC units. If all conditions are met simultaneously, multiple modules simultaneously start the corresponding capacitive test logic. First, the AC / DC module is turned off, the system current sharing is exited by controlling the current sharing unit, the step-down DC / DC module is turned off at the same time, and the output step-down DC / DC module starts to adjust the output voltage, enabling the integrated parallel DC unit to be capacitive tested to be powered by the battery. The output voltage is adjusted to the battery terminal discharge current and maintained at the preset value until the battery termination discharge voltage point or 10 hours of maintenance to complete the capacitive test operation. During the entire capacitive test process, the intelligent management unit immediately uploads the capacitive test data to the edge management terminal;

[0033] The edge management terminal is provided with a single set module capacitive test cycle. When the set cycle is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum capacitive test load, whether all batteries are in the intermittent charging state, and whether there are no other faults and alarm messages in the integrated parallel DC unit. If all conditions are met simultaneously, it issues commands to the intelligent management units of all integrated parallel DC units, and starts one by one from the module with the lowest serial number. The single module starts the corresponding capacitive test logic. First, the AC / DC module is turned off, the system current sharing is exited by controlling the current sharing unit, the step-down DC / DC module is turned off at the same time, and the output step-down DC / DC module starts to adjust the output voltage, enabling the integrated parallel DC unit to be capacitive tested to be powered by the battery. The output voltage is adjusted to the battery terminal discharge current and maintained at the preset value until the battery termination discharge voltage point or 10 hours of maintenance to complete the capacitive test operation. During the entire capacitive test process, the intelligent management unit immediately uploads the capacitive test data to the edge management terminal;

[0034] When the edge management terminal receives the capacity verification instruction sent from the background, it detects whether the system bus current meets the minimum load for capacity verification, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. The edge management terminal sends the capacity verification instruction to the intelligent management unit of one or more specified integrated parallel DC units. After receiving the instruction, the intelligent management unit detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacity verification, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter.

[0035] When the system edge management terminal function / communication fails and reaches the previously set cycle, the intelligent management unit of the integrated parallel DC unit with the lowest communication address uses CAN communication to detect whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacity verification, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter. If all conditions are met simultaneously, the edge management terminal module enables the corresponding capacity verification logic of a single integrated parallel DC unit simultaneously / one by one.

[0036] When the capacity verification termination condition is reached, the intelligent management unit activates the AC / DC module to restore the DC400V bus, ensuring that the integrated parallel DC unit can ensure uninterrupted output when switching from being powered by the battery to AC power supply. The step-down DC / DC module is turned on to achieve constant current charging, and immediately the current sharing unit resumes the normal current sharing logic and is carried by the output DC / DC module. After the charging state becomes intermittent, the intelligent management unit stops sending capacity verification data, completing the capacity verification operation of a single integrated parallel DC unit.

[0037] Furthermore, the following steps are also included:

[0038] By means of regular capacity verification, shallow charge and discharge, or internal resistance testing, single cells with lagging capacity are discovered. When single cells with lagging capacity are discovered, the batteries are charged and discharged to activate the active substances inside the batteries, extend the service life of the batteries, and maximize the usage cycle of each battery.

[0039] According to the load data of the DC bus, during the peak stage of the grid electricity price, in combination with the edge management terminal, the AC / DC is managed through the module intelligent management unit to determine whether the battery is in the charging or discharging state, and some modules are in the discharging and loading state. During the valley stage of the grid electricity price, the modules are in the charging state.

[0040] The system edge management terminal monitors through CAN communication with each unit, performs remote control, remote adjustment, remote measurement, and remote signaling operations on the modules, records the data information of each unit, and implements array management on each unit according to the collected data. The control unit controls the charging and discharging methods of the configured batteries, enabling each unit to charge and discharge independently, charge simultaneously, charge and discharge at different times, some units to be charging, some to be undergoing capacity verification discharge, some to be undergoing shallow charge and discharge, and some to be undergoing internal resistance detection.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] Through the edge management terminal, using distributed thinking technology, from the system architecture and array - type innovative management method, it improves the power supply reliability of the DC power supply system and realizes the maintenance - free design of the DC power supply system;

[0043] Effectively extends the service life of the storage batteries. Each storage battery can be used until the end of its life, improving the utilization rate of the storage batteries;

[0044] The system realizes the working mode of the array - type management module through the edge management terminal, and at the same time realizes peak shaving and valley filling in the use of energy, contributing to carbon emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of an array - type DC power supply system provided by an embodiment of the present invention.

[0046] Figure 2 It is an internal schematic diagram of an integrated parallel DC power supply unit of an array - type DC power supply system provided by an embodiment of the present invention.

[0047] Figure 3 It is a schematic diagram of a conventional operating power supply system.

[0048] In the figure: 1. Integrated parallel DC power supply unit; 2. Edge management terminal module; 3. Battery; 4. Step - down DC / DC module; 5. Voltage open - loop boost DC / DC module; 6. AC / DC module; 7. DC / DC module; 8. Intelligent management unit; 9. CAN communication unit; 10. Current sharing unit; 11. Output step - down DC / DC module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well - known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0051] Now, exemplary embodiments according to the present application will be described in more detail with reference to the drawings. However, these exemplary embodiments can be implemented in many different forms and should not be construed as limited only to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present application is thorough and complete, and the concept of these exemplary embodiments is fully conveyed to those of ordinary skill in the art. In the drawings, for clarity, the thickness of layers and regions may be enlarged, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.

[0052] According to Figures 1 - 3 , an array-type DC power supply system is provided, including:

[0053] An integrated parallel DC power supply unit 1, the integrated parallel DC power supply unit 1 having a power input terminal, a DC output terminal and a battery 3, the battery 3 being isolated from the power input terminal and the DC output terminal, and a plurality of the integrated parallel DC power supply units 1 being connected in parallel to form a system, and the batteries 3 of each of the integrated parallel DC power supply units 1 being isolated from each other;

[0054] An edge management terminal module 2, the edge management terminal module 2 being electrically connected to the integrated parallel DC power supply unit 1;

[0055] Isolate the battery from the DC bus output terminal and the power input terminal, and isolate the battery from each other among the batteries in the system;

[0056] Charge the built-in battery and output to the DC bus at the same time;

[0057] When the front-end DC bus is normal, the output voltage value of the output buck DC / DC converter is lower than that of the output DC / DC converter and is in a standby state;

[0058] When the front-end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same level as that of the output step-down DC / DC converter, the output step-down DC / DC immediately takes over to ensure uninterrupted module output and the power supply reliability of the system.

[0059] When there is a short circuit at the outlet of the system feeder switch and the module needs to output a large current for a short time to drive the feeder switch to trip, the intelligent management unit controls through the current sharing unit to make the output DC / DC module and the output step-down DC / DC module jointly undertake the large current output.

[0060] The edge management terminal is set with multiple / single module capacitive discharge cycles. When the set cycle is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitive discharge, whether all batteries are in the intermittent charging state, and whether there are no other faults and alarm messages in the integrated parallel DC unit. It issues commands to the intelligent management units of multiple integrated parallel DC units. If all conditions are met simultaneously, multiple modules start the corresponding capacitive discharge logic at the same time. First, the AC / DC module is turned off, the system current sharing is exited by controlling the current sharing unit, the step-down DC / DC module is turned off at the same time, and the output step-down DC / DC module starts to adjust the output voltage to enable the integrated parallel DC unit to be capacitive discharged to be powered by the battery. The output voltage is adjusted to the battery terminal discharge current and maintained at the preset value until the battery termination discharge voltage point or 10 hours of capacitive discharge operation is completed. During the entire capacitive discharge process, the intelligent management unit immediately uploads the capacitive discharge data to the edge management terminal.

[0061] The edge management terminal is set with a single module capacitive discharge cycle. When the set cycle is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitive discharge, whether all batteries are in the intermittent charging state, and whether there are no other faults and alarm messages in the integrated parallel DC unit. If all conditions are met simultaneously, it issues commands to the intelligent management units of all integrated parallel DC units. Starting from the module with the lowest serial number, each single module starts the corresponding capacitive discharge logic. First, the AC / DC module is turned off, the system current sharing is exited by controlling the current sharing unit, the step-down DC / DC module is turned off at the same time, and the output step-down DC / DC module starts to adjust the output voltage to enable the integrated parallel DC unit to be capacitive discharged to be powered by the battery. The output voltage is adjusted to the battery terminal discharge current and maintained at the preset value until the battery termination discharge voltage point or 10 hours of capacitive discharge operation is completed. During the entire capacitive discharge process, the intelligent management unit immediately uploads the capacitive discharge data to the edge management terminal.

[0062] When the edge management terminal receives the capacity verification instruction sent from the background, it detects whether the system bus current meets the minimum load for capacity verification, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. The edge management terminal sends the capacity verification instruction to the intelligent management unit of one or more specified integrated parallel DC units. After receiving the instruction, the intelligent management unit detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacity verification, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter.

[0063] When the edge management terminal function / communication of the system fails and reaches the previously set cycle, the intelligent management unit of the integrated parallel DC unit with the lower communication address uses CAN communication to detect whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacity verification, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter. If all conditions are met simultaneously, the edge management terminal module enables the corresponding capacity verification logic of a single integrated parallel DC unit simultaneously / one by one.

[0064] When the capacity verification termination condition is reached, the intelligent management unit starts the AC / DC module, restores the DC400V bus, ensures that the integrated parallel DC unit can ensure uninterrupted output when switching from being powered by the battery to AC power supply, turns on the buck DC / DC module to achieve constant current charging, immediately enables the current sharing unit to restore the normal current sharing logic and be carried by the output DC / DC module. After the charging state becomes intermittent, the intelligent management unit stops sending capacity verification data, completing the capacity verification operation of a single integrated parallel DC unit.

[0065] Among them, the edge management terminal module 2 is signal-connected to multiple integrated parallel DC power supply units 1 through CAN communication, performing remote control, remote adjustment, remote measurement, and remote signaling operations on the modules, and recording the data information of each unit.

[0066] Among them, the battery 3 is electrically connected to the buck DC / DC module 4 and the voltage open-loop boost DC / DC module 5.

[0067] Among them, the buck DC / DC module 4 is electrically connected to the AC / DC module 6, the DC / DC module 7, and the intelligent management unit 8.

[0068] Among them, the intelligent management unit 8 is electrically connected to the CAN communication unit 9, the current sharing unit 10, the voltage open-loop boost DC / DC module 5, the AC / DC module 6, and the output buck DC / DC module 11. The output buck DC / DC module 11 is electrically connected to the voltage open-loop boost DC / DC module 5, and the output buck DC / DC module 11 is electrically connected to the current sharing unit 10.

[0069] Among them, the step-down DC / DC module 4 is electrically connected to the output step-down DC / DC module 11 and the DC / DC module 7, and the AC / DC module 6 is electrically connected to the DC / DC module 7.

[0070] Among them, it further includes a DC feeder distribution unit, and the DC feeder distribution unit is electrically connected to the integrated parallel DC power supply unit 1.

[0071] Based on another aspect of the embodiment of the present invention, there is provided an array-type DC power management method based on the above-mentioned array-type DC power system, including the following steps:

[0072] Isolate the battery 3 from the DC bus output terminal and the power input terminal, and isolate the battery 3 from each battery 3 in the system from each other;

[0073] Charge the built-in battery 3 and output to the DC bus at the same time;

[0074] When the front-end DC bus is normal, the output voltage value of the output step-down DC / DC converter is lower than that of the output DC / DC converter and is in the standby state;

[0075] When the front-end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same as that of the output step-down DC / DC converter, the output step-down DC / DC immediately takes over;

[0076] Among them, it further includes the following steps:

[0077] The system edge management terminal communicates and monitors with each unit through CAN, performs remote control, remote adjustment, remote measurement and remote signaling operations on the modules, records the data information of each unit, and implements array management on each unit according to the collected data. The control unit controls the charging and discharging methods of the configured battery 3, so that each unit can be charged and discharged separately, can be charged simultaneously, can be charged and discharged at different times, some units can be in the charging state, some can be in the capacity checking and discharging state, some can be in the shallow charging and discharging state, and some can be in the internal resistance detection state.

[0078] Among them, it further includes the following steps:

[0079] Discover the single battery 3 with a capacity lag through regular capacity checking, shallow charging and discharging or internal resistance testing means. When discovering the single battery 3 with a capacity lag, charge and discharge the battery 3 to activate the active substances inside the battery 3, extend the service life of the battery 3, and maximize the service cycle of each battery 3;

[0080] According to the load data of the DC bus, at the peak stage of the grid electricity price, in combination with the edge management terminal, manage the AC / DC through the module intelligent management unit to realize whether the battery is in the charging or discharging state, and let some modules be in the discharging and loading state. At the valley stage of the grid electricity price, let the modules be in the charging state.

[0081] Internal working description of the module: The module inputs can be AC input (AC80 - 280V) and DC input (DC120V - DC320V). After AC / DC conversion, a stable DC400V DC bus is formed. This DC bus serves as the input for the output DC / DC and buck DC / DC. The output DC / DC forms an output bus including DC240 / 220 / 110 / 48V. The output of the buck DC / DC is connected to the battery terminal, mainly for charging the battery. The buck DC / DC converter uses constant current and constant voltage charging. After completing the constant current and constant voltage charging, it enters the charging stop state, and the battery enters the discharging stage. When the battery capacity drops by 5% of the nominal capacity, the charging restarts. This cycle allows the battery to be shallowly charged and discharged to reach the required backup capacity. The control strategy of intermittent charging management is implemented through the intelligent management unit;

[0082] A boost DC / DC converter is also connected to the battery side. The output of this converter is under open - loop control and is connected to the output buck DC / DC. When the front - end DC400V DC bus is normal, the output voltage value of the output buck DC / DC converter is slightly lower than that of the output DC / DC converter by about 2V and is in the standby state. Once the DC400V is abnormal or the output voltage of the output DC / DC converter drops to the same level as the output buck DC / DC converter, the output buck DC / DC immediately takes over to ensure uninterrupted module output and the reliability of system power supply.

[0083] When a short - circuit occurs at the outlet of the system feeder switch and the module needs to output a large current for a short time to drive the feeder switch to trip, the intelligent management unit controls through the current sharing unit to enable the output DC / DC and the output buck DC / DC to jointly bear the large - current output, reducing the output impact of the large current of the output DC / DC converter and enhancing the reliability of the module.

[0084] Remote capacitive discharge principle: Capacitive discharge means discharging the battery at a constant current of I10 until the termination voltage point. Remote capacitive discharge is achieved by sending commands from the background to the edge management terminal, which then distributes the capacitive discharge commands to the intelligent management units of each integrated parallel DC unit. After receiving the commands, the intelligent management units will detect whether the DC400V bus is normal at this time, whether the system bus current meets the minimum load for capacitive discharge, whether the battery is in an intermittent charging state, and whether there are any other faults / alarm messages in the converter. When all these conditions are met, the corresponding capacitive discharge logic is initiated. First, the AC / DC converter is turned off, and the system current sharing is exited by controlling the current sharing unit. At the same time, the step-down DC / DC is turned off, and the output step-down DC / DC starts to adjust the output voltage, enabling the integrated parallel DC unit to be powered by the battery. The output voltage is adjusted to maintain the discharge current at the battery terminal at the I10 value until the battery termination discharge voltage point or until 10 hours have passed to complete the capacitive discharge operation. When the above capacitive discharge termination conditions are reached, or when the conditions are maintained for a short period of 100ms, the intelligent management unit first starts the AC / DC converter to restore the DC400V bus, ensuring uninterrupted output during the process of switching the module from battery power to AC power. The charging step-down DC / DC converter is turned on to achieve constant current charging, and immediately the current sharing unit resumes the normal current sharing logic and is carried by the output DC / DC. During the entire capacitive discharge process, the module intelligent management unit immediately uploads capacitive discharge data (voltage, current, capacity) to the edge management terminal. When the charging state becomes intermittent, the intelligent management unit stops sending capacitive discharge data, completing the capacitive discharge operation of a single integrated parallel DC unit.

[0085] In this system, a single lithium battery module and a power supply power module (including AC / DC and charge-discharge DC / DC conversion) are innovatively designed and integrated into an "integrated parallel DC power supply unit", and an array-type DC power supply system is formed by paralleling the DC output terminals of multiple units.

[0086] The system consists of several integrated parallel DC power supply units, an edge management terminal module, and a DC feeder distribution unit.

[0087] Each integrated parallel DC power supply unit consists of a power input terminal and a DC output terminal. The lithium battery is built into the unit module, and the battery is isolated from both the unit output terminal and the power input terminal. When multiple units are paralleled to form a system, the batteries are isolated from each other. When a battery is abnormal, it only affects the load output of this unit when the input power is cut off, and does not affect the load-carrying capacity of the DC bus. When each integrated parallel power supply unit is working, it charges the built-in battery and outputs to the DC bus at the same time. When the front-end DC bus is normal, the output voltage value of the output step-down DC / DC converter is lower than that of the output DC / DC converter and is in a standby state. When the front-end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same level as the output step-down DC / DC converter, the output step-down DC / DC immediately takes over the load.

[0088] The system edge management terminal and each unit are monitored through CAN communication, and the remote control, remote adjustment, remote measurement and remote signaling of the module are realized, and the data information of each unit is recorded. Array management is implemented for each unit after the data is collected, and the unit can control the charging and discharging mode of the configured battery. Each unit can be charged and discharged separately, can be charged and discharged at the same time, or can be charged and discharged at different times, that is, some units are in charging, some are in core capacity discharge, some are in shallow charging and shallow discharge, and some are in internal resistance detection, so as to realize the orderly management of all module units. The realization of matrix energy management through the edge management terminal is a breakthrough innovation in system management.

[0089] Through the working mode of array management unit, the battery can be effectively managed at the same time. The battery can detect the lagging single cell in capacity in advance through regular capacity verification, shallow charging and discharging, internal resistance testing and other means, and the battery can be reasonably charged and discharged to effectively extend the battery life, maximize the use cycle of each battery, and make the best use of assets.

[0090] The matrix management system can manage the AC / DC according to the load data of the DC bus. During the peak period of grid electricity prices, combined with the edge management terminal, the module intelligent management unit can manage the battery in charging or discharging state, so that some modules are in discharge and load state. When the grid electricity price is at the valley stage, the module is in charging state, and the lithium battery's multiple charge and discharge cycle characteristics are used as much as possible to achieve peak shaving and valley filling, energy conservation and emission reduction, and maximize the utilization rate of the battery.

[0091] Typical applications include Figure 2 , through input switch, power connection cable, edge management terminal, and device fixed cabinet. Its application in DC system of transformer / distribution station (including communication power system) has great practical and promotion value.

[0092] By the method of this embodiment, the following problems are solved: 1. Solve the problem of the charging management of other healthy batteries by a single abnormal battery. The battery pack of a conventional DC power supply system is composed of several batteries connected in series. Once a single battery is abnormal or presents a certain impedance, when the whole battery pack is charged, the charging current of other normal batteries is restricted, resulting in the problem that normal batteries cannot be fully charged. Undercharging will affect the service life of the batteries. 2. Solve the problem that a single abnormal battery affects the DC bus voltage during system discharge. The battery pack of a conventional DC power supply system is composed of several batteries connected in series. Once a single battery is abnormal or presents a certain impedance, it will cause the load voltage of the output bus to drop and affect the load. 3. Solve the problem of low utilization rate of the battery pack in a conventional DC power supply system. 4. Electricity is a major industry for carbon reduction, which means that power equipment needs to gradually meet the requirements of carbon peaking and carbon neutrality. The invention of this system can achieve that when the AC is normal, each module does not charge and discharge at the same time. The system edge management terminal controls through software according to the load size. When the electricity price is at the peak stage, any 1 / 3 of the modules are in battery discharge, and the rest of the modules are in AC power supply. When the electricity price is at the valley stage, they are in charging, maximizing the characteristics of the lithium battery with more than 2000 cycles of charge and discharge, playing the role of peak shaving and valley filling, improving the utilization rate of the lithium battery, reducing the application of lead-acid batteries, and contributing to carbon reduction. 5. Through the edge management terminal, the intelligent operation and maintenance and management of the DC power management system can be realized. Users do not need to participate manually throughout the process, and a maintenance-free design is achieved.

[0093] The present invention has been described above with reference to the embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, those skilled in the art can make various substitutions and modifications, and these substitutions and modifications should fall within the scope of the present invention.

Claims

1. An array-type DC power supply system, characterized in that, Including: An integrated parallel DC power supply unit, which has a power input terminal, a DC output terminal and a battery. The battery is isolated from the power input terminal and the DC output terminal. Multiple such integrated parallel DC power supply units are connected in parallel to form a system, and the batteries of each integrated parallel DC power supply unit are isolated from each other; An edge management terminal module, which is electrically connected to the integrated parallel DC power supply unit; Isolate the battery from the DC bus output terminal and the power input terminal, and isolate the battery from each other in the system; Charge the built-in battery and output to the DC bus at the same time; When the front-end DC bus is normal, the output voltage value of the output buck DC / DC converter is lower than that of the output DC / DC converter and is in a standby state; When the front-end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same as that of the output buck DC / DC converter, the output buck DC / DC immediately takes over to ensure uninterrupted module output and the power supply reliability of the system; When the system feeder switch outlet is short-circuited and the module needs to output a large current for a short time to drive the feeder switch to trip, the intelligent management unit controls through the current sharing unit to make the output DC / DC module and the output buck DC / DC module jointly undertake the large current output; The edge management terminal is provided with a set number of module core capacity cycles. When the set cycle is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum core capacity load, whether all batteries are in an intermittent charging state, and whether there are no other faults and alarm messages in the integrated parallel DC unit. It issues instructions to the intelligent management units of multiple integrated parallel DC units. If all are satisfied, multiple modules simultaneously start the corresponding core capacity logic. First, turn off the AC / DC module, exit the system current sharing by controlling the current sharing unit, at the same time turn off the buck DC / DC module, and at the same time the output buck DC / DC module starts to adjust the output voltage, so that the integrated parallel DC unit to be core-capacitated realizes energy supply by the battery, and the output voltage is adjusted to maintain the battery terminal discharge current at a preset value until the battery termination discharge voltage point or 10 hours is maintained to complete the core capacity operation. During the whole core capacity process, the intelligent management unit immediately uploads the core capacity data to the edge management terminal; Alternatively, the edge management terminal is provided with a set single-module capacitance checking period. When the set period is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance checking, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. If all are met, an instruction is sent to the intelligent management units of all integrated parallel DC units. Starting from the module with the lowest serial number, each single module activates the corresponding capacitance checking logic. First, the AC / DC module is turned off, the system current sharing is exited by controlling the current sharing unit, and at the same time, the buck DC / DC module is turned off. Meanwhile, the output buck DC / DC module starts to adjust the output voltage so that the integrated parallel DC unit to be capacitance-checked realizes energy bearing provided by the battery, and the output voltage is adjusted to maintain the battery terminal discharge current at a preset value until the battery termination discharge voltage point or 10 hours are maintained to complete the capacitance checking operation. During the entire capacitance checking process, the intelligent management unit immediately uploads the capacitance checking data to the edge management terminal; When the edge management terminal receives the capacitance checking instruction sent from the background, it detects whether the system bus current meets the minimum load for capacitance checking, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. The edge management terminal sends the capacitance checking instruction to the intelligent management units of one or more specified integrated parallel DC units. After receiving the instruction, the intelligent management unit detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance checking, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter; When the system edge management terminal function / communication fails and the previously set period is reached, the intelligent management unit of the integrated parallel DC unit with the lowest communication address uses CAN communication to detect whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance checking, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter. If all are met, the edge management terminal module enables the corresponding capacitance checking logic of a single integrated parallel DC unit simultaneously / one by one; When the capacitance checking termination condition is reached, the intelligent management unit activates the AC / DC module to restore the DC400V bus, ensuring that the integrated parallel DC unit can ensure uninterrupted output when switching from energy bearing provided by the battery to AC power supply. The buck DC / DC module is turned on to achieve constant current charging, and the current sharing unit immediately restores the normal current sharing logic to be carried by the output DC / DC module. After the charging state becomes intermittent, the intelligent management unit stops sending the capacitance checking data to complete the capacitance checking operation of a single integrated parallel DC unit.

2. The array-type DC power supply system according to claim 1, wherein The edge management terminal module is signal-connected to multiple integrated parallel DC power supply units through CAN communication to perform remote control, remote adjustment, remote measurement, and remote signaling operations on the modules and record the data information of each unit.

3. The array-type DC power supply system according to claim 1, characterized in that, The input end of the battery is connected to the output end of the buck DC / DC module, the input end of the buck DC / DC module is connected to the output end of the AC / DC module, and the input end of the AC / DC module is connected to the power input end.

4. The array-type DC power supply system according to claim 3, wherein The output terminal of the battery is electrically connected to the input terminal of the voltage open-loop boost DC / DC module. The output terminal of the voltage open-loop boost DC / DC module is electrically connected to the input terminals of the output buck DC / DC module and the output DC / DC module. The output terminals of the output buck DC / DC module and the output DC / DC module are connected to the output bus.

5. The array-type DC power supply system according to claim 4, characterized in that It further includes an intelligent management unit, a CAN communication unit, and a current sharing unit. The CAN communication unit is connected to the AC / DC module and the intelligent management unit. The intelligent management unit is connected to the current sharing unit, the output DC / DC module, the buck DC / DC module, the voltage open-loop boost DC / DC module, and the output buck DC / DC module.

6. The array-type DC power supply system according to claim 5, characterized in that, The current sharing unit is connected to the output buck DC / DC module and the output DC / DC module.

7. The array-type DC power supply system according to claim 1, characterized in that It further includes a DC feeder distribution unit, and the DC feeder distribution unit is electrically connected to the integrated parallel DC power supply unit.

8. The array DC power management method for the array DC power system according to any one of claims 2-7, characterized in that It includes the following steps: Isolate the battery from the DC bus output terminal and the power input terminal, and isolate each battery in the system from each other. Charge the built-in battery and output to the DC bus at the same time. When the front-end DC bus is normal, the output voltage value of the output buck DC / DC converter is lower than that of the output DC / DC converter and is in the standby state. When the front-end DC bus is abnormal or the output voltage of the output DC / DC converter drops to the same as that of the output buck DC / DC converter, the output buck DC / DC immediately takes over to ensure uninterrupted module output and the power supply reliability of the system. When the outlet of the system feeder switch is short-circuited and the module needs to output a large current for a short time to drive the feeder switch to trip, the intelligent management unit controls through the current sharing unit to make the output DC / DC module and the output buck DC / DC module jointly undertake the large current output. The edge management terminal is provided with a set number of module core capacity cycles. When the set cycle is reached, it detects whether the DC bus is normal at this time, detects whether the system bus current meets the minimum load for core capacity, whether all batteries are in the intermittent charging state, and whether there are no other faults and alarm messages in the integrated parallel DC unit, and issues instructions to the intelligent management units of multiple integrated parallel DC units. If all are met, multiple modules simultaneously start the corresponding core capacity logic. First, turn off the AC / DC module, exit the system current sharing by controlling the current sharing unit, at the same time turn off the buck DC / DC module, and at the same time the output buck DC / DC module starts to adjust the output voltage, so that the integrated parallel DC unit to be core-capacitated realizes energy supply by the battery, and the output voltage is adjusted to maintain the battery terminal discharge current at a preset value until the battery terminal discharge voltage point or until 10 hours to complete the core capacity operation. During the entire core capacity process, the intelligent management unit immediately uploads the core capacity data to the edge management terminal. Alternatively, the edge management terminal is provided with a set single-module capacitance verification cycle. When the set cycle is reached, it detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance verification, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. If all are satisfied, it issues an instruction to the intelligent management units of all integrated parallel DC units, starting from the module with the lowest serial number one by one. The single module activates the corresponding capacitance verification logic. First, it shuts down the AC / DC module, exits the system current sharing through the control of the current sharing unit, and at the same time shuts down the step-down DC / DC module. At the same time, the output step-down DC / DC module starts to adjust the output voltage so that the integrated parallel DC unit to be capacitance-verified realizes energy bearing provided by the battery, and the output voltage is adjusted to maintain the battery terminal discharge current at a preset value until the battery termination discharge voltage point or 10 hours of maintenance to complete the capacitance verification operation. During the entire capacitance verification process, the intelligent management unit immediately uploads the capacitance verification data to the edge management terminal; When the edge management terminal receives the capacitance verification instruction issued by the background, it detects whether the system bus current meets the minimum load for capacitance verification, whether all batteries are in the intermittent charging state, and whether there are no other faults or alarm messages in the integrated parallel DC unit. The edge management terminal issues the capacitance verification instruction to the intelligent management units of one or more specified integrated parallel DC units. After receiving the instruction, the intelligent management unit detects whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance verification, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter; When the system edge management terminal function / communication fails and the previously set cycle is reached, the intelligent management unit of the integrated parallel DC unit with the lowest communication address uses CAN communication to detect whether the DC bus is normal at this time, whether the system bus current meets the minimum load for capacitance verification, whether the battery is in the intermittent charging state, and whether there are no other faults or alarm messages in the converter. If all are satisfied, the edge management terminal module enables the single integrated parallel DC unit to activate the corresponding capacitance verification logic simultaneously / one by one; When the capacitance verification termination condition is reached, the intelligent management unit starts the AC / DC module, restores the DC400V bus, ensures that the integrated parallel DC unit can ensure uninterrupted output when switching from energy bearing provided by the battery to AC power supply, turns on the step-down DC / DC module to achieve constant current charging, immediately enables the current sharing unit to restore the normal current sharing logic and is borne by the output DC / DC module. After the charging state becomes intermittent, the intelligent management unit stops sending capacitance verification data and completes the capacitance verification operation of a single integrated parallel DC unit.

9. The array type DC power management method according to claim 8, wherein It further includes the following steps: By means of regular capacitance verification, shallow charge and discharge, or internal resistance testing, the single battery with a capacity lag is discovered. When the single battery with a capacity lag is discovered, the battery is charged and discharged to activate the active substances inside the battery, extend the service life of the battery, and maximize the usage cycle of each battery; According to the load data of the DC bus, during the peak stage of the grid electricity price, in combination with the edge management terminal, the module intelligent management unit manages the AC / DC to achieve whether the battery is in the charging or discharging state, and allows some modules to be in the discharging and loading state. During the valley stage of the grid electricity price, the modules are in the charging state; The system edge management terminal communicates and monitors with each unit through CAN, performs remote control, remote adjustment, remote measurement and remote signaling operations on the modules, records the data information of each unit, implements array management on each unit according to the collected data, and the control unit controls the charging and discharging methods of the configured battery, enabling each unit to charge and discharge independently, charge simultaneously, charge and discharge at different times, some units to be in the charging state, some in the core capacity discharge state, some in the shallow charge and discharge state, and some in the internal resistance detection state.

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