Hardware-level energy storage cooperation and overload protection system of multi-power charging pile

Abstract

The invention discloses a hardware-level energy storage collaboration and overload protection system for a multi-power charging pile, and solves the problems that an existing charging pile classification system only supports a single type of energy storage batteries, cannot respond to high-power-level (160kW) fast charging instantaneous impact, is not bound with dynamic matching logic of the power level and the energy storage type of the charging pile, and cannot respond to the high-power-level (160kW) fast charging instantaneous impact. In order to solve the problems that the service life of an energy storage battery is attenuated and accelerated due to the fact that a single energy storage mode cannot meet high-power (160kW) fast charging instantaneous impact, and the response delay time is relatively long due to the fact that hardware level binding of a charging pile power level and an energy storage type is not established, a flywheel energy storage system and an energy storage topology module form a composite energy storage topology form; the load peak value of the power grid can be effectively buffered, effective distribution is carried out in cooperation with a two-stage priority load reduction mechanism, and high-response and fast-recovery continuous power supply is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to a hardware-level energy storage coordination and overload protection system for multi-power charging piles. BACKGROUND

[0002] With the popularization of electric vehicles, the demand for charging piles is increasing, and the parallel operation of multi-power level charging piles is becoming more common. However, there are many problems in the prior art, for example, the traditional current sharing strategy when multiple power level charging piles are operated in parallel, will cause insufficient power supply of high-power piles and energy waste of low-power piles; a single energy storage system cannot simultaneously meet the instantaneous high-power response and long-time stable power supply requirements; and there is a lack of priority load shedding mechanism under transformer capacity constraints, and the overload failure rate is high under limited transformer capacity.

[0003] The multi-power charging pile described in the prior art is shown in references 1 and 2.

[0004] Reference 1: Chinese patent document with publication number CN220764113U.

[0005] Reference 1 describes a multi-port intelligent distribution charging pile with energy storage function, which includes an AC power supply module, an AC / DC rectifier module, a first load distribution board, an energy storage battery module, a second load distribution board, a DC / DC transformer module, an EMS controller, a charging monitoring module, and a charging interface circuit. The AC power supply module outputs the rectified DC signal to the first load distribution board through the AC / DC rectifier module; one output loop of the first load distribution board is connected with the energy storage battery, and the other loops are connected with the charging interface circuit; the energy storage battery module is connected with the second load distribution board through the DC / DC transformer module, and then connected with the charging interface circuit, and the EMS controller is connected with the energy storage battery module. In the case of insufficient distribution capacity, expansion through energy storage can configure more charging interfaces under the same capacity, flexible distribution, reuse of energy storage battery charging power and conventional charging power, and reduction of redundant idle power.

[0006] The technical feature of the charging pile in reference 1 is that in the case of insufficient distribution capacity, expansion through the AC / DC rectifier module + load distribution board can configure more charging interfaces under the same capacity, flexible distribution, reuse of energy storage battery charging power and conventional charging power, and reduction of redundant idle power. However, it only supports a single type of energy storage battery, cannot respond to 160kW level fast charging instantaneous impact, and does not bind the dynamic matching logic of charging pile power level and energy storage type, so the single energy storage method cannot meet the 160kW fast charging instantaneous impact, resulting in accelerated degradation of energy storage battery life.

[0007] Reference 2: Chinese patent document with publication number CN115946562A.

[0008] Reference 2 describes a hybrid energy storage charging pile system and a collaborative control method, the charging pile system comprising a current voltage acquisition module, an intelligent charging pile control module, an alternating current slow charging system, a direct current fast charging system and a hybrid energy storage system; the current voltage acquisition module is connected with an input alternating current power grid, and the alternating current power grid load is monitored in real time, the intelligent charging pile control module provides real-time information according to the current voltage acquisition module and the alternating current slow charging system, the direct current fast charging system, the hybrid energy storage system feedback information, and the alternating current slow charging system, the direct current fast charging system, the hybrid energy storage system are distributed to the alternating current power. The charging pile system and the collaborative control method solve the problems that the single energy storage technology cannot consider high power density, high energy density, long service life, safety and other problems, and at the same time, due to the difficulty of increasing the capacity of the community power frequency transformer, the demand for short-time fast charging of household electric vehicles is solved.

[0009] However, it does not establish the hardware level binding of the charging pile power level and the energy storage type, resulting in a long response delay time; therefore, it does not meet the existing demand, and for this we propose a hardware level energy storage collaboration and overload protection system for multi-power charging piles. SUMMARY

[0010] The purpose of the present application is to provide a hardware level energy storage collaboration and overload protection system for multi-power charging piles, to solve the problems of the existing charging pile classification system in the background art, which only supports a single type of energy storage battery, cannot respond to high power level (160kW) fast charging instantaneous impact, and does not bind the dynamic matching logic of the charging pile power level and the energy storage type, the single energy storage method cannot meet the 160kW fast charging instantaneous impact, resulting in accelerated energy storage battery life decay, and the hardware level binding of the charging pile power level and the energy storage type is not established, resulting in a long response delay time.

[0011] To achieve the above purpose, the present application provides the following technical scheme: a hardware level energy storage collaboration and overload protection system for multi-power charging piles, characterized in that it comprises a multi-power charging pile, a hardware collaborative controller, a flywheel energy storage system and an energy storage topology module;

[0012] The hardware collaborative controller is connected to the transformer through a monitoring loop and a control loop, and the hardware collaborative controller and the transformer have an FPGA load calculation module and a two-stage overload protection module, and the FPGA load calculation module and the two-stage overload protection module constitute a two-stage priority load reduction mechanism, when the actual load of the transformer exceeds the set threshold, the two-stage priority load reduction mechanism is started;

[0013] The multi-power charging pile is connected with the hardware cooperative controller through the monitoring loop and the control loop, the multi-power charging pile includes a high-power charging pile, a medium-power charging pile and a low-power charging pile, and the multi-power charging pile is provided with a power identification module between the multi-power charging pile and the hardware cooperative controller, and the multi-power charging pile and the power identification module are connected through a CAN bus.

[0014] The flywheel energy storage system and the energy storage topology module are both connected with the hardware cooperative controller through the monitoring loop and the control loop, the energy storage topology module includes a super capacitor and a lithium battery, the interface of the super capacitor is connected with the DC bus access terminal row HVIL high voltage interlock of the high-power charging pile, so that the high-power charging pile and the super capacitor interface are hardware bound; the lithium battery is connected with the medium-power charging pile and the low-power charging pile through an IGBT circuit, so that the lithium battery and the medium-power charging pile and the low-power charging pile are hardware bound.

[0015] As a further optimization of the hardware level energy storage cooperation and overload protection system of the multi-power charging pile of the application, the high-power charging pile adopts a SiC MOSFET switching circuit, and the high-power charging pile interface terminal is provided with an HVIL high voltage interlock.

[0016] As a further optimization of the hardware level energy storage cooperation and overload protection system of the multi-power charging pile of the application, the two-stage overload protection module is nested in the transformer low-voltage side A phase with a CT coil.

[0017] As a further optimization of the hardware level energy storage cooperation and overload protection system of the multi-power charging pile of the application, the high-speed motor of the flywheel energy storage system adopts a nanocrystalline magnetic core, an LLC converter is used as a bidirectional energy interface of the flywheel energy storage system to realize charging and discharging functions, and a cold start circuit is used to provide VCC power supply for the LLC converter.

[0018] As a further optimization of the hardware level energy storage cooperation and overload protection system of the multi-power charging pile of the application, the cold start circuit is preheated by a hydrogen fuel cell to provide a large instantaneous current for the motor of the flywheel energy storage system.

[0019] As a further optimization of the hardware level energy storage cooperation and overload protection system of the multi-power charging pile of the application, the power of the high-power charging pile is 160kW, the power of the medium-power charging pile is 120kW, and the power of the low-power charging pile is 80kW.

[0020] As a further optimization of the hardware level energy storage cooperation and overload protection system of the multi-power charging pile of the application, the hardware cooperative controller uses a FPGA load calculation module to establish a load calculation model, and the formula is:

[0021]

[0022] P = 0.5 * (V * I)trans I is the current load of the transformer; avg I is the average current;

[0023] The two-stage overload protection module of the two-stage priority load shedding mechanism sets two load thresholds, a first threshold and a second threshold, and performs two-stage load shedding, first-stage load shedding and second-stage load shedding, and the recovery of load shedding adopts step-by-step recovery:

[0024] First-stage load shedding: when P trans > the first threshold and P trans ≤ the second threshold, the action of reducing the low-power charging pile to 50% is performed, and after load shedding, first-stage recovery logic is triggered, the first-stage recovery logic passes through the cooling recovery time T recover of the cooling timer, and the recovery condition A is verified again, the recovery condition A is P trans < P RA for 30s, and after the recovery condition A is met, the low-power charging pile is restored to low-power power;

[0025] Second-stage load shedding: when P trans > the second threshold, the action of reducing the medium-power charging pile to 70% and cutting off the low-power charging pile is performed, and after load shedding, second-stage recovery logic is triggered, the second-stage recovery logic passes through the cooling recovery time T recover of the cooling timer, and the recovery condition B is verified again, the recovery condition B is P trans < P RB for 60s, and after the recovery condition B is met, the medium-power charging pile is restored to medium-power power and the low-power charging pile is still offline, and after the second-stage recovery logic is met, whether to perform load shedding again or to meet the condition of triggering the first-stage recovery logic is judged according to the current load P trans .

[0026] The first threshold is 1100kW, the second threshold is 1170kW, P RA =1000kW, and P RB =1050kW.

[0027] The flywheel energy storage system and the LLC converter constitute a hot backup system, and when the medium-power charging pile is reduced, the high-power charging pile is fully powered by the flywheel energy storage system.

[0028] The calculation method of the cooling recovery time T recover of the cooling timer includes the following steps:

[0029] Calculate the load deviation value, and the formula is:

[0030] ΔP=|P trans -P threshold |;

[0031] wherein Ptrans is the actual load of the current transformer, P threshold is the load shedding threshold, which is the first threshold of the primary threshold or the second threshold of the secondary threshold;

[0032] Convert to time base T base , the formula is:

[0033]

[0034] Among them, P rated is the rated capacity of the transformer, k is the empirical coefficient, and its value is 5s / kW;

[0035] Output cooling recovery time T recover :

[0036] T recover =T base .

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention utilizes a two-level priority load reduction mechanism, reducing the low-power pile (80kW) as the low-priority load first, and cooperates with the flywheel energy storage system to ensure that the high-value pile (160kW) operates at full power, avoiding transformer overload failure. The SiC MOSFET circuit and HVIL pin are used together to bind the high-value pile (160kW) charging pile to a supercapacitor, which can effectively reduce the startup delay of the high-value pile.

[0039] The composite energy storage topology formed by the flywheel energy storage system and the energy storage topology module can effectively buffer the load peak of the power grid, and effectively distribute it with a two-level priority load reduction mechanism, and ensure continuous power replenishment with high response and fast recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the system structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the hardware-level power storage binding structure of the present invention. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] See also Figure 1 , an embodiment provided by the present invention: a hardware-level energy storage coordination and overload protection system for a multi-power charging pile, comprising a multi-power charging pile, a hardware coordination controller, a flywheel energy storage system and an energy storage topology module;

[0044] The hardware cooperative controller is connected with the transformer through the monitoring loop and the control loop, the transformer is a three-phase transformer, and the hardware cooperative controller has an FPGA load calculation module and a two-stage overload protection module with the transformer, the two-stage overload protection module and the FPGA load calculation module form a two-stage priority load shedding mechanism, the two-stage overload protection module is embedded in the low-voltage side A phase of the transformer with a CT coil, and the two-stage overload protection module is used for monitoring the transformer load in real time and triggering the hierarchical load shedding.

[0045] The multi-power charging pile is connected with the hardware cooperative controller through the monitoring loop and the control loop, the multi-power charging pile includes a 160kW charging pile, a 120kW charging pile and an 80kW charging pile, the 160kW charging pile adopts a SiC MOSFET switching circuit (model C3M0075120K), can realize a response of ≤3.5ms, and the 160kW charging pile is provided with an HVIL high-voltage interlock at an interface terminal, and the multi-power charging pile has a power identification module with the hardware cooperative controller, the power identification module analyzes charging pile nameplate parameters (160kW / 120kW / 80kW), the multi-power charging pile and the power identification module are connected through a CAN bus, a CAN_H / CAN_L line is connected to a charging pile communication interface, and a baud rate is 250kbps.

[0046] The flywheel energy storage system and the energy storage topology module are connected with the hardware cooperative controller through the monitoring loop and the control loop, and the energy storage topology module includes a super capacitor and a lithium battery.

[0047] The flywheel energy storage system and the energy storage topology module form a composite energy storage topology form, can effectively buffer the load peak of the power grid, effectively distribute the two-stage priority load shedding mechanism, guarantee continuous power supply with high response and fast recovery, and also have a certain off-grid power supply effect.

[0048] The flywheel energy storage system (high power density) and the hybrid energy storage topology (super capacitor + lithium battery, high energy density) realize cooperation through a three-stage closed loop of a monitoring loop (state sensing), a control loop (instruction issuing) and a hardware cooperative controller (real-time decision-making).

[0049] The monitoring loop collects parameters such as flywheel speed, SOC (super capacitor / lithium battery state of charge) and power grid load fluctuation in real time. The control loop dynamically allocates power instructions based on the algorithm of the cooperative controller (such as model predictive control MPC or fuzzy logic). The hardware cooperative controller: may adopt FPGA or real-time DSP, to ensure microsecond-level response (flywheel inertia compensation) and millisecond-level energy scheduling (battery / capacitor switching).

[0050] The composite energy storage adopts a parallel DC bus structure and realizes power flow control through a bidirectional DC / DC converter to avoid energy backflow caused by direct coupling.

[0051] Two-level priority load shedding mechanism:

[0052] Level 1 (millisecond response): The flywheel + supercapacitor prioritizes responding to high-frequency load peaks (such as motor startup and arc furnace surges). The flywheel absorbs transient high power (kW level), while the supercapacitor supplements sub-transient energy (kJ level), avoiding frequent high-rate discharge of the lithium battery (extending its life).

[0053] Level 2 (seconds / minutes): When the overload lasts for more than 10 seconds or the flywheel speed is lower than the threshold (such as 70% of the rated speed), the lithium battery slowly takes over and simultaneously initiates a dynamic load reduction strategy (such as non-critical load removal and charging power limitation) to ensure bus voltage stability.

[0054] like Figure 2 As shown, the supercapacitor interface and the 160kW charging pile's DC bus access terminal block HVIL high-voltage interlocking prevents mis-insertion, achieving hardware binding between the 160kW charging pile and the supercapacitor interface; the 160kW charging pile is physically hardware-bound to the supercapacitor (750V HVIL interface);

[0055] The lithium battery is connected to the 120kW charging pile and the 80kW charging pile through the IGBT circuit, realizing the hardware binding of the lithium battery and the 120kW charging pile and the 80kW charging pile;

[0056] The flywheel energy storage system's high-speed motor uses a nanocrystalline magnetic core, and an LLC converter serves as the flywheel energy storage system's bidirectional energy interface to achieve charging and discharging functions. A cold start circuit provides VCC power for the LLC converter, which is preheated by a hydrogen fuel cell. The core of the flywheel energy storage system is to store kinetic energy through a high-speed rotating flywheel, and then convert the kinetic energy into electrical energy through the motor when electricity is needed.

[0057] The flywheel of the flywheel energy storage system is made of polymer-based composite materials. Low temperatures can cause the matrix material to harden, restrict internal molecular motion, and significantly increase viscosity, resulting in increased internal friction loss, increased starting resistance torque, and even an inability to start on its own. The cold start circuit is the "emergency power source" of the flywheel energy storage hot backup system. Its core function is to provide a transient high current to the flywheel motor when the main power supply fails to start, driving the flywheel to overcome static friction and begin to rotate. The combination of "hydrogen fuel cell preheating + cold start circuit" solves the problems of insufficient starting power and increased material viscosity at low temperatures.

[0058] The LLC converter can be selected in a matrix layout, and the flywheel energy storage system and the LLC converter constitute a hot backup system. When the 120kW charging pile is reduced in power, the 160kW charging pile is fully powered by the flywheel energy storage;

[0059] The hardware cooperative controller establishes a load calculation model by using an FPGA load calculation module, and the formula is:

[0060]

[0061] P trans is the actual load of the current transformer, I avg is the average current;

[0062] Because the system cannot immediately restore the power after the load reduction action is completed, otherwise it will be overloaded again immediately, a "cooling timer" is needed, so a "restoration time algorithm" is needed to calculate T recover .

[0063] The two-level overload protection module of the two-level priority load reduction mechanism has two load thresholds, 1100kW and 1170kW, and performs two-level load reduction, namely first-level load reduction and second-level load reduction, and the recovery of the load reduction adopts step-by-step recovery. The step-by-step recovery is adopted because if all the piles are restored at once after the second-level load reduction, it may be overloaded again. The 80kW charging pile is in a low priority, and even if the second-level recovery condition is met, it also needs to wait for the next independent triggering of the first-level recovery logic to restore the 80kW pile alone.

[0064] First-level load reduction: when P trans > 1100kW and P trans ≤ 1170kW, the 80kW charging pile is reduced to 40kW, and the first-level recovery logic is triggered after the load reduction. The first-level recovery logic has a cooling recovery time T recover of the cooling timer, and then verifies the recovery condition A. The recovery condition A is that P trans < 1000kW for 30s, and after the recovery condition A is met, the 80kW charging pile is restored to 80kW normal power;

[0065] Second-level load reduction: when P trans > 1170kW, the 120kW charging pile is reduced to 84kW, and the 80kW charging pile is disconnected, and the second-level recovery logic is triggered after the load reduction. The second-level recovery logic has a cooling recovery time T recover of the cooling timer, and then verifies the recovery condition B. The recovery condition B is that P trans < 1050kW for 60s, and after the recovery condition B is met, the 120kW charging pile is restored to 120kW power and the 80kW charging pile is still offline. After the second-level recovery logic is met, the 80kW charging pile is restored according to the current load P transThe value is judged whether to reduce load again or to meet the condition of triggering the primary recovery logic.

[0066] The calculation method of the recovery time comprises the following steps:

[0067] The load deviation value is calculated, and the formula is:

[0068] ΔP = |P trans -P threshold |;

[0069] Wherein P trans is the actual load of the current transformer, P threshold is the load reduction threshold, which is the primary threshold 1100kW or the secondary threshold 1170kW;

[0070] Convert to time base T base , and the formula is:

[0071]

[0072] Wherein P rated is the rated capacity of the transformer, which can be selected as the rated capacity of the transformer 1500kVA≈1500kW, and k is an empirical coefficient, which is 5s / kW;

[0073] Output the recovery time T recover :

[0074] T recover = T base .

[0075] 80kW charging is reduced as a low-priority load first, ensuring that the high-value 160kW pile operates at full power, avoiding transformer overload failure.

[0076] For example: when the secondary load reduction trigger is triggered, the 80kW charging pile is cut off, the 120kW charging pile is reduced to 84kW, and if the secondary recovery logic condition (P trans <1050kW for 60s) is met, only the 120kW pile is restored to 120kW, and the 80kW charging pile is still offline; the current load value condition is judged again, if the load is reduced again, such as P trans <1000kW for 30s, the primary recovery logic is triggered, and the 80kW charging pile is restarted to 80kW.

[0077] The experimental data of the response delay after the above hardware-level power and energy storage binding are as shown in the following table:

[0078] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A hardware-level energy storage coordination and overload protection system for multi-power charging piles, characterized by: Includes multi-power charging piles, hardware collaborative controllers, flywheel energy storage systems and energy storage topology modules; The hardware collaborative controller is connected to the transformer through a monitoring loop and a control loop. An FPGA load calculation module and a two-stage overload protection module are provided between the hardware collaborative controller and the transformer. The FPGA load calculation module and the two-stage overload protection module form a two-stage priority load reduction mechanism. When the actual load of the transformer exceeds a set threshold, the two-stage priority load reduction mechanism is activated. The multi-power charging pile is connected to the hardware collaborative controller through the monitoring circuit and the control circuit. The multi-power charging pile includes a high-power charging pile, a medium-power charging pile and a low-power charging pile. A power identification module is provided between the multi-power charging pile and the hardware collaborative controller. The multi-power charging pile and the power identification module are connected via a CAN bus. The flywheel energy storage system and the energy storage topology module are both connected to the hardware collaborative controller through the monitoring loop and the control loop. The energy storage topology module includes a supercapacitor and a lithium battery. The interface of the supercapacitor is interlocked with the DC bus access terminal block HVIL of the high-power charging pile, realizing hardware binding between the high-power charging pile and the supercapacitor interface; the lithium battery is connected to the medium-power charging pile and the low-power charging pile through the IGBT circuit, realizing hardware binding between the lithium battery and the medium-power charging pile and the low-power charging pile.

2. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized by: The high-power charging pile adopts a SiC MOSFET switching circuit, and the high-power charging pile interface terminal is configured with an HVIL high-voltage interlock.

3. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized by: The two-stage overload protection module is nested in the A phase of the low-voltage side of the transformer with a CT coil.

4. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized by: The high-speed motor of the flywheel energy storage system adopts a nanocrystalline magnetic core, uses an LLC converter as a bidirectional energy interface of the flywheel energy storage system to realize charging and discharging functions, and uses a cold start circuit to provide VCC power supply for the LLC converter.

5. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized in that: The cold start circuit is preheated by the hydrogen fuel cell to provide instantaneous high current to the motor of the flywheel energy storage system.

6. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized by: The power of the high-power charging pile is 160kW, the power of the medium-power charging pile is 120kW, and the power of the low-power charging pile is 80kW.

7. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized by: The hardware collaborative controller uses the FPGA load calculation module to establish a load calculation model, and its formula is: Among them, P trans is the actual load of the current transformer, I avg is the average current; The two-level overload protection module of the two-level priority load reduction mechanism has two load thresholds, namely the first threshold and the second threshold, and performs two-level load reduction, namely the first load reduction and the second load reduction, and the load reduction recovery adopts a step-by-step recovery method: Level 1 load reduction: When P trans > first threshold and P trans When the load is less than the second threshold, the action is executed to reduce the low-power charging pile to 50%. After the load is reduced, the first-level recovery logic is triggered. The first-level recovery logic is restored after the cooling timer T recover , then verify the recovery condition A, the recovery condition A is P trans <P RA This continues for 30 seconds, and the low-power charging pile is restored to low power after recovery condition A is met; Second level load reduction: When P trans > the second threshold, the action is executed to reduce the power of the medium-power charging pile to 70%, and the low-power charging pile is cut off. After the load is reduced, the secondary recovery logic is triggered. The secondary recovery logic recovers after the cooling timer T recover , then verify the recovery condition B, the recovery condition B is P trans <P RB Lasts for 60s. After the recovery condition B is met, the medium power charging pile is restored to medium power and the low power charging pile is still offline. After the secondary recovery logic is met, the current load P is restored. trans The value determines whether to reduce the load again or meet the conditions for triggering the first-level recovery logic.

8. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 7 is characterized by: The first threshold is 1100kW, the second threshold is 1170kW, and P RA =1000kW, P RB =1050kW.

9. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 1 is characterized by: The flywheel energy storage system and LLC converter constitute a hot backup system. When the medium-power charging pile is derated, the high-power charging pile is fully powered by the flywheel energy storage system.

10. The hardware-level energy storage coordination and overload protection system for multi-power charging piles according to claim 7, characterized in that: The cooling recovery time T of the cooling timer recover The calculation method includes the following steps: Calculate the load deviation value, the formula is: ΔP=|P trans -P threshold |; Among them, P trans is the actual load of the current transformer, P threshold is the load shedding threshold, which is the first threshold of the primary threshold or the second threshold of the secondary threshold; Convert to time base T base , the formula is: Among them, P rated is the rated capacity of the transformer, k is the empirical coefficient, and its value is 5s / kW; Output cooling recovery time T recover : T recover =T base 。

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