A multi-gun charging pile group charging power control device and control method

Abstract

The present invention relates to a multi-gun charging pile group charging power control device, comprising: a power control module, a four-input and four-output switch module, and more than two charging guns, each charging gun is correspondingly equipped with a main control module and three DC charging modules, and each DC charging module is correspondingly equipped with a one-input and four-output switch module; the power control module is used to run the power distribution algorithm, control the power output process according to the voltage and current required by the charging gun, and realize the power distribution between multiple charging guns; the main control module is used for billing and realizing data interaction between the charging gun and the vehicle through CAN communication. The present invention performs real-time power distribution between multiple charging guns of the charging pile, thereby solving the problem of power waste or power shortage in different charging scenarios, and then efficiently utilizing the power of the charging pile; the charging control process of the present invention is scientific, reasonable, and simple.

Description

Technical Field

[0001] The present invention belongs to the technical field of DC charging piles, and specifically relates to a group charging power control device and a control method for a multi-gun charging pile. Background Art

[0002] As energy and environmental issues become increasingly prominent, the electrification of vehicles has become an inevitable trend. Unlike refueling traditional energy vehicles, charging electric vehicles is a continuous process.

[0003] In different charging scenarios, electric vehicles with different power requirements will be encountered. Electric buses, long-distance buses and other models have large battery capacity and require rapid charging. When the required power is greater than the power supply capacity of a single charging pile, the charging time will be longer. When small electric vehicles require lower power, the power module of the charging pile will be partially idle, thus wasting its own power.

[0004] The charging time of an electric vehicle from a charging pile is inversely proportional to the power of the charging pile, that is, the greater the power of the charging pile, the shorter the charging time. However, the greater the power of the charging pile, the higher the cost. At present, the new energy electric vehicle charging pile industry is highly competitive. For a single charging pile, it is impossible to increase the charging power endlessly. This will not only result in extremely high costs, but also bring great waste of resources.

[0005] There are two common power distribution methods for existing charging piles on the market: 1. Power equalization, which will lead to power waste. 2. Priority for early vehicles, which will lead to a very long waiting time for later vehicles. Neither of these two methods is the global optimal solution. In this application industry context, designing a DC charging pile power distribution device and distribution control method with superior performance and competitive cost is the primary problem faced by major manufacturers. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a multi-charger charging pile group charging power control device and control method to share the DC charging pile power. The technical solution adopted by the present invention is as follows:

[0007] A multi-charger charging pile group charging power control device, comprising: a power control module, a four-input and four-output switch module, and two or more charging guns, each charging gun is correspondingly equipped with a main control module and three DC charging modules, and each DC charging module is correspondingly equipped with a one-input and four-output switch module;

[0008] The power control module is connected and communicated with the DC charging module through CAN1, connected and communicated with the one-input and four-output switch module and the four-input and four-output switch module respectively through CAN2, and connected and communicated with the main control module respectively through CAN3; the main control module is connected and communicated with the charging gun through the control line; the DC charging module is connected with the one-input and four-output switch module and the four-input and four-output switch module in sequence; the four-input and four-output switch module is connected and communicated with the charging gun;

[0009] The power control module outputs power to the charging gun through the DC charging module and the switch module, and is used to run the power distribution algorithm, control the power output process according to the voltage and current required by the charging gun, and realize power distribution among multiple charging guns;

[0010] The main control module is used for billing and data exchange between the charging gun and the vehicle through CAN communication, to determine the required voltage and current for charging, and to transmit the required voltage and current to the power control module.

[0011] A method for controlling the charging power of a multi-charging pile group is provided, which distributes power between multiple charging guns in real time through a power distribution algorithm. The power distribution algorithm includes three steps:

[0012] (1) Exclusive module allocation:

[0013] DC charging module 1 is only assigned to gun No. 1 for output, DC charging module 4 is only assigned to gun No. 2 for output, DC charging module 7 is only assigned to gun No. 3 for output, and DC charging module 10 is only assigned to gun No. 4 for output;

[0014] (2) Priority module allocation:

[0015] DC charging module 2 and DC charging module 3 give priority to outputting to gun No. 1, DC charging module 5 and DC charging module 6 give priority to outputting to gun No. 2, DC charging module 8 and DC charging module 9 give priority to outputting to gun No. 3, and DC charging module 11 and DC charging module 12 give priority to outputting to gun No. 3;

[0016] (3) Borrowing module allocation:

[0017] If there is no idle DC charging module, the power allocation algorithm ends. If there is an idle DC charging module, the charging time of the four charging guns is sorted; the required power of the charging gun is determined in descending order according to the charging time, and the idle DC charging module is allocated to the charging gun.

[0018] Beneficial effects of the present invention:

[0019] 1) The purpose of the present invention is to provide a multi-gun charging pile group charging power control device and control method, which adopts a method of multiple charging guns sharing high power, and performs real-time power distribution among multiple charging guns of the charging pile according to the charging needs of the charging vehicle, thereby solving the power waste or power shortage problems in different charging scenarios, and then efficiently utilizing the power of the charging pile.

[0020] 2) The charging control process of the present invention is scientific, reasonable and simple. The power allocation algorithm of the present invention can ensure that the charging pile has a certain power output for each vehicle, so that the charging pile and the dedicated parking space for charging will not be occupied for too long. When a large vehicle is charging, the idle DC charging module can be allocated to the large vehicle for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the description of the specific implementation or the prior art. Obviously, the drawings described below are some specific implementations of the present invention. For ordinary technicians in this field, other drawings within the protection scope of this application can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a topological diagram of a four-gun group charging power control device according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of an electrical interface of a power control module according to an embodiment of the present invention;

[0024] Figure 3 A power allocation algorithm flow chart of an embodiment of the present invention;

[0025] Figure 4 This is a control flow chart of the charging process according to an embodiment of the present invention;

[0026] Figure 5 This is a charging start-up flow chart of an embodiment of the present invention;

[0027] Figure 6 is a power adjustment flow chart of an embodiment of the present invention;

[0028] Figure 7 This is a flowchart of stopping charging according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] The embodiment of the present invention is described by taking 1 power control module, 1 4-input 4-output switch module, 4 charging guns, 4 main control modules, 12 DC charging modules, and 12 1-input 4-output switch modules as examples. In order to facilitate the understanding of this embodiment, the 12 DC charging modules are referred to as DC charging module No. 1 to DC charging module No. 12; the 4 charging guns are referred to as gun No. 1, gun No. 2, gun No. 3, and gun No. 4; the 250A split-type one-machine two-gun DC charging pile is referred to as a charging pile; and the 240kW split-type four-interface charging cabinet is referred to as a charging cabinet.

[0031] like Figure 1 The topology diagram of the four-gun group charging power control device of the embodiment of the present invention is shown in FIG. The four-gun charging pile group charging power control device of the present embodiment is divided into two types of devices: one charging cabinet and two charging piles.

[0032] The charging cabinet contains 1 power control module, 12 DC charging modules, 12 one-input and four-output switch modules, and 1 four-input and four-output switch module.

[0033] Each charging pile has two charging guns and two main control modules.

[0034] The power control module is installed in the charging cabinet. It is a circuit board (for example, the new energy PowerCTL_V1.2 model circuit board can be used). It outputs power to the charging gun through the DC charging module and the switch module. The execution subject of the charging process control is the power control module, which is used to coordinate the power distribution of the entire system. The power distribution algorithm described in the embodiment of the present invention also runs in the power control module.

[0035] The power control module exchanges data with 4 main control modules, 12 DC charging modules, 12 one-input and four-output switch modules, and 1 four-input and four-output switch module through CAN communication. Its main function is to control the power output process, run the power allocation algorithm, and allocate power among several charging guns. By exchanging data with the DC charging module and the switch module, the power is output to the charging gun according to the allocated ratio.

[0036] There are 12 DC charging modules in the charging cabinet, each with an output power of 0KW to a maximum of 20KW. The power control module receives instructions through CAN communication to adjust whether to output power and the amount of output power. Each DC charging module is connected to a one-input and four-output switch module, for a total of 12. The power control module receives instructions through CAN communication, and the power output of the DC charging module is combined into 4 power outputs according to the instructions of the power control module.

[0037] The 4 outputs of the one-input four-output switch module are connected to the four-input four-output switch module. The CAN communication receives the instructions of the power control module to control the switch of each channel. The other end of the four-input four-output switch module outputs the 4 power outputs to the 4 charging guns of the two charging piles.

[0038] Each charging gun is equipped with a charging main control module, for a total of four. The main control module is installed in the charging pile. The main function of the main control module is mainly for billing and to realize data exchange between the charging gun and the car through CAN communication. It is used to determine the required voltage, current and other information for charging, and transmit the required voltage, current and other information to the power control module. The main control module is a circuit board (for example: the Xinneng EV_DCchargeV1.2 model circuit board can be used), a total of 4 pieces, which are installed in two 250A split-type one-machine dual-gun DC charging piles, and connected to the charging gun through a CAN communication line.

[0039] like Figure 2 The power control module electrical interface of the embodiment of the present invention is shown in FIG. The power control module electrical interface includes 3 CAN fully isolated communications, 1 spare RS485 fully isolated communications, 9 active inputs, and 6 passive dry contact normally open outputs.

[0040] The first CAN fully isolated communication channel communicates with 12 DC charging modules; the second CAN fully isolated communication channel communicates with 12 one-input and four-output switch modules and one four-input and four-output switch module. The third CAN fully isolated communication channel communicates with four main control modules. Each DC charging module corresponds to a one-input and four-output switch module, and a four-input and four-output switch module is connected behind the one-input and four-output switch module.

[0041] 1 spare RS485 fully isolated communication channel for debugging.

[0042] The 1st active input is for collecting the status 1 signal of the AC incoming circuit breaker, the 2nd active input is for collecting the status 2 signal of the AC incoming circuit breaker, the 3rd active input is for collecting the status 1 signal of the lightning arrester, the 4th active input is for collecting the status 2 signal of the lightning arrester, the 5th active input is for collecting the status 1 signal of the AC contactor, the 6th active input is for collecting the status 2 signal of the AC contactor, the 7th active input is for collecting the status signal of the access switch, the 8th active input is for collecting the status signal of the water switch, and the 9th active input is for collecting the status signal of the cooling system.

[0043] The 1st passive dry contact normally open output is the AC contactor control 1 control signal, the 2nd passive dry contact normally open output is the AC contactor control 2 control signal, the 3rd passive dry contact normally open output is the cooling system control 1 control signal, the 4th passive dry contact normally open output is the cooling system control 2 control signal, the 5th passive dry contact normally open output is the DC charging module emergency shutdown control signal, and the 6th passive dry contact normally open output is the standby control signal.

[0044] To facilitate understanding of this embodiment, the control method of this embodiment is introduced below through two parts: power allocation algorithm and charging process control.

[0045] 1. Power allocation algorithm.

[0046] like Figure 3 FIG. 1 is a flow chart of a power allocation algorithm according to an embodiment of the present invention. The power allocation algorithm needs to perform three steps: exclusive module allocation, priority module allocation, and borrowed module allocation.

[0047] (1) Exclusive module allocation:

[0048] DC charging module 1 is only allocated to gun No. 1 for output, DC charging module 4 is only allocated to gun No. 2 for output, DC charging module 7 is only allocated to gun No. 3 for output, and DC charging module 10 is only allocated to gun No. 4 for output. In the basic allocation, these DC charging modules will only be allocated to the corresponding charging guns.

[0049] S101, check whether gun No. 1 is being charged, if it is being charged, execute S102; if it is not being charged, execute S103.

[0050] S102, assigning DC charging module No. 1 to gun No. 1.

[0051] S103, check whether gun No. 2 is being charged, if it is being charged, execute S104; if it is not being charged, execute S105.

[0052] S104, assigning DC charging module No. 4 to gun No. 2.

[0053] S105, check whether gun No. 3 is being charged, if it is being charged, execute S106; if it is not being charged, execute S107.

[0054] S106. Allocate DC charging module No. 7 to gun No. 3.

[0055] S107, check whether gun No. 4 is being charged, if it is being charged, execute S108; if it is not being charged, execute S109.

[0056] S108. Allocate DC charging module No. 10 to gun No. 4.

[0057] After the exclusive modules are allocated, priority modules are allocated.

[0058] (2) Priority module allocation:

[0059] When multiple vehicles are charging at the same time, the principle of fair distribution is adopted to ensure that the charging pile has a power output of 60KW, or 3 DC charging modules, for each vehicle.

[0060] DC charging module 2 and DC charging module 3 give priority to outputting to gun No. 1, DC charging module 5 and DC charging module 6 give priority to outputting to gun No. 2, DC charging module 8 and DC charging module 9 give priority to outputting to gun No. 3, and DC charging module 11 and DC charging module 12 give priority to outputting to gun No. 3.

[0061] In the exclusive module allocation, 1 DC charging module has been allocated. Each gun can be allocated up to 2 DC charging modules in its own priority module.

[0062] S109, determine whether the required power of gun No. 1 is greater than 20KW, if yes, execute S110, if not, execute S113.

[0063] S110, No. 2 charging module is assigned to No. 1 gun

[0064] S111, determine whether the required power of gun No. 1 is greater than 40KW, if yes, execute S112, if not, execute S113.

[0065] S112, charging module No. 3 is assigned to gun No. 1.

[0066] S113, determine whether the required power of gun No. 2 is greater than 20KW, if yes, execute S114, if not, execute S117.

[0067] S114, charging module No. 5 is assigned to gun No. 2.

[0068] S115, determine whether the required power of gun No. 2 is greater than 40KW, if yes, execute S116, if not, execute S117.

[0069] S116, charging module No. 6 is assigned to gun No. 2.

[0070] S117, determine whether the required power of gun No. 3 is greater than 20KW, if yes, execute S118, if not, execute S121.

[0071] S118, No. 8 charging module is assigned to No. 3 gun.

[0072] S119, determine whether the required power of gun No. 3 is greater than 40KW, if yes, execute S120, if not, execute S121.

[0073] S120, No. 9 charging module is assigned to No. 3 gun.

[0074] S121, determine whether the required power of gun No. 4 is greater than 20KW, if yes, execute S122, if not, execute S125.

[0075] S122, No. 11 charging module is assigned to No. 4 gun.

[0076] S123, determine whether the required power of gun No. 4 is greater than 40KW, if yes, execute S124, if not, execute S125.

[0077] S124, No. 12 charging module is assigned to No. 4 gun.

[0078] In the priority module allocation, electric vehicles with a power demand greater than 40KW have been allocated 3 DC charging modules. If there are idle charging piles or there are electric vehicles with a power demand less than 40KW being charged, in order to avoid power waste, the DC charging modules that have not been allocated in the exclusive module allocation and priority module allocation will be allocated to vehicles with a power demand greater than 60KW.

[0079] (3) Borrowing module allocation:

[0080] S125. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S126 is executed.

[0081] S126. Sort the charging times of the four charging guns.

[0082] S127, determine whether the required power of the gun for the first charging time is greater than 60KW, if not, execute S130, if yes, execute S128.

[0083] S128. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S129 is executed.

[0084] S129. Allocate the idle DC charging module to gun No. 1.

[0085] S130, determining whether the required power of the gun for the second charging time is greater than 60KW, if not, executing S133, if yes, executing S131.

[0086] S131. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S132 is executed.

[0087] S132. Allocate the idle DC charging module to gun No. 2.

[0088] S133, determine whether the power required by the gun for the third charging time is greater than 60KW, if not, execute S136, if yes, execute S134.

[0089] S134. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S135 is executed.

[0090] S135. Allocate the idle DC charging module to gun No. 3.

[0091] S136, determine whether the required power of the gun for the fourth charging time is greater than 60KW, if not, execute S139, if yes, execute S137.

[0092] S137. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S138 is executed.

[0093] S138. Allocate the idle DC charging module to gun No. 4.

[0094] S139, determining whether the required power of the gun for the first charging time is greater than 80KW, if not, executing S142, if yes, executing S140.

[0095] S140: If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S141 is executed.

[0096] S141. Allocate the idle DC charging module to gun No. 1.

[0097] S142, determine whether the required power of the gun for the second charging time is greater than 80KW, if not, execute S145, if yes, execute S143.

[0098] S143. If there is no idle DC charging module, the power allocation algorithm ends; if there is still an idle DC charging module, execute S144.

[0099] S144. Allocate the idle DC charging module to gun No. 2.

[0100] S145, determining whether the power required by the gun for the third charging time is greater than 80 kW, if not, executing S148, if yes, executing S146.

[0101] S146. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S147 is executed.

[0102] S147. Allocate the idle DC charging module to gun No. 3.

[0103] S148, determine whether the required power of the gun for the fourth charging time is greater than 80KW, if not, execute S151, if yes, execute S149.

[0104] S149. If there is no idle DC charging module, the power allocation algorithm ends; if there is an idle DC charging module, S150 is executed.

[0105] S150, allocating the idle DC charging module to gun No. 4.

[0106] S151: The power allocation algorithm ends.

[0107] 2. Charging process control.

[0108] like Figure 4 The figure shows a flow chart of the charging process control of an embodiment of the present invention. The execution subject is a 240kW split four-interface charging cabinet. The charging process control of the charging gun includes the following steps:

[0109] S200, when the electric vehicle is connected to the charging pile N guns (N = 1, 2, 3, 4) and starts charging, the N main control module of the N gun sends a soft start command to the power control module, and S201 is executed.

[0110] S201, the power control module determines whether it has received a soft start command sent by the master control module No. N. If it has received it, execute S202, if not, execute S203.

[0111] S202, control the N*3 DC charging module to output power. Figure 5 The figure shows a charging start-up flow chart of an embodiment of the present invention. First, the power control module detects the state of the exclusive DC charging module of charging gun No. N. If it is in standby mode, it starts up; if the DC charging module is in working state, the switch module is closed. The "working state" is sent to the No. N main control module to change to "working".

[0112] S203, the power control module determines whether it has received the power adjustment instruction sent by the master control module No. N. If it has received it, execute S204, and if it has not received it, execute S205.

[0113] S204, such as Figure 6As shown, it is a power adjustment flow chart of an embodiment of the present invention. The power control module executes the power allocation algorithm S101 to S151 in this embodiment. It is judged whether the newly calculated allocation result is consistent with the previously running one. If it is consistent, the DC charging module is not adjusted on and off, and the switch module is not adjusted on and off. If it is inconsistent, the DC charging module is judged and processed on and off. After the corresponding DC charging module switch module is adjusted, the power allocation is completed.

[0114] S205, the power control module determines whether it has received the stop charging instruction sent by the Nth master control module, and if so, executes S206, and if not, executes S201.

[0115] S206, turn off the DC charging module that provides power output to the Nth gun, such as Figure 7 As shown in the figure, it is a flowchart of stopping charging in an embodiment of the present invention. First, the power control module detects the mode of the DC charging module that provides power output to the charging gun No. N. If it is in the working mode, a shutdown command is sent to the DC charging module and a disconnection command is sent to the switch module connected to the charging. If it is in the standby state and the switch module is in the disconnected state, a signal is sent to the No. N main control module that the "working state" is changed to "standby".

[0116] S207, charging of gun N is completed.

[0117] For electric vehicles on the market, small cars generally require power below 60KW, and large vehicles require power below 100KW. The power allocation algorithm described in the embodiment of the present invention. The principle of fair allocation is adopted below 60KW to ensure that the charging pile has a certain power output for each vehicle, so that the waiting time for charging is not too long, causing customers to wait too long, and the charging pile and charging-exclusive parking spaces to occupy too long. When large vehicles are charging, the idle DC charging modules can be allocated to large vehicles for use, achieving global optimization of efficiency.

[0118] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A multi-charger charging pile group charging power control device, comprising: A power control module, a four-input and four-output switch module, and two or more charging guns, wherein each charging gun is correspondingly equipped with a main control module and three DC charging modules, and each DC charging module is correspondingly equipped with a one-input and four-output switch module; The power control module is connected and communicated with the DC charging module through CAN1, connected and communicated with the one-input and four-output switch module and the four-input and four-output switch module respectively through CAN2, and connected and communicated with the main control module respectively through CAN3; the main control module is connected and communicated with the charging gun through the control line; the DC charging module is connected with the one-input and four-output switch module and the four-input and four-output switch module in sequence; the four-input and four-output switch module is connected and communicated with the charging gun; The power control module outputs power to the charging gun through the DC charging module and the switch module, and is used to run the power distribution algorithm, control the power output process according to the voltage and current required by the charging gun, and realize power distribution among multiple charging guns; The main control module is used for charging and data exchange between the charging gun and the vehicle through CAN communication, and is used to determine the required voltage and current for charging, and transmit the required voltage and current to the power control module; It includes: one charging cabinet and two charging piles. The charging cabinet is equipped with one power control module, 12 DC charging modules, 12 one-input and four-output switch modules, and one four-input and four-output switch module. Each charging pile is equipped with two charging guns and two main control modules. The power control module is installed in the charging cabinet and exchanges data with 4 main control modules, 12 DC charging modules, 12 one-input and four-output switch modules, and 1 four-input and four-output switch module through CAN communication; The 12 DC charging modules in the charging cabinet receive instructions from the power control module through CAN communication to adjust whether to output power and the amount of output power; each DC charging module is connected to a one-input and four-output switch module, which receives instructions from the power control module through CAN communication and combines the power output of the DC charging module into four power outputs according to the instructions of the power control module; The 4 outputs of the one-input and four-output switch module are connected to the four-input and four-output switch module, which receives the instructions of the power control module through CAN communication to control the switch of each channel; the other end of the four-input and four-output switch module outputs the 4 power outputs to the 4 charging guns of the two charging piles respectively; Each charging gun is equipped with a charging main control module, which is installed in the charging pile; The electrical interface of the power control module includes 3-way CAN fully isolated communication, 1-way standby RS485 fully isolated communication, 9-way active input, and 6-way passive dry contact normally open output; The first CAN fully isolated communication channel communicates with 12 DC charging modules; the second CAN fully isolated communication channel communicates with 12 one-input and four-output switch modules and one four-input and four-output switch module; the third CAN fully isolated communication channel communicates with four main control modules; 1 spare RS485 fully isolated communication channel for debugging.

2. A multi-gun charging pile group charging power control device according to claim 1, characterized in that: The 1st active input is for collecting the status 1 signal of the AC incoming circuit breaker, the 2nd active input is for collecting the status 2 signal of the AC incoming circuit breaker, the 3rd active input is for collecting the status 1 signal of the lightning arrester, the 4th active input is for collecting the status 2 signal of the lightning arrester, the 5th active input is for collecting the status 1 signal of the AC contactor, the 6th active input is for collecting the status 2 signal of the AC contactor, the 7th active input is for collecting the status signal of the access switch, the 8th active input is for collecting the status signal of the water switch, and the 9th active input is for collecting the status signal of the cooling system.

3. A multi-gun charging pile group charging power control device according to claim 1, characterized in that: The 1st passive dry contact normally open output is the AC contactor control 1 control signal, the 2nd passive dry contact normally open output is the AC contactor control 2 control signal, the 3rd passive dry contact normally open output is the cooling system control 1 control signal, the 4th passive dry contact normally open output is the cooling system control 2 control signal, the 5th passive dry contact normally open output is the DC charging module emergency shutdown control signal, and the 6th passive dry contact normally open output is the standby control signal.

4. A method for controlling the charging power of a multi-charging pile group, which uses a power allocation algorithm to perform real-time power allocation between multiple charging guns, characterized in that: The multi-gun charging pile group charging power control device according to any one of claims 1 to 3 is applied, and the power allocation algorithm includes three steps: (1) Exclusive module allocation: DC charging module 1 is only assigned to gun No. 1 for output, DC charging module 4 is only assigned to gun No. 2 for output, DC charging module 7 is only assigned to gun No. 3 for output, and DC charging module 10 is only assigned to gun No. 4 for output; (2) Priority module allocation: DC charging module 2 and DC charging module 3 give priority to outputting to gun No. 1, DC charging module 5 and DC charging module 6 give priority to outputting to gun No. 2, DC charging module 8 and DC charging module 9 give priority to outputting to gun No. 3, and DC charging module 11 and DC charging module 12 give priority to outputting to gun No. 3; (3) Borrowing module allocation: If there is no idle DC charging module, the power allocation algorithm ends. If there is an idle DC charging module, the charging time of the four charging guns is sorted; the required power of the charging gun is determined in descending order according to the charging time, and the idle DC charging module is allocated to the charging gun.

5. A method for controlling charging power of a multi-charger charging pile group according to claim 4, characterized in that: The charging process control of the charging gun includes the following steps: S200, when the electric vehicle is connected to the charging pile gun No. N and starts charging, the No. N main control module of the No. N gun sends a soft start command to the power control module, and S201 is executed; S201, the power control module determines whether it has received the soft start command sent by the Nth master control module, if it has received it, execute S202, if not, execute S203; S202, control the N*3 DC charging module to output power. First, the power control module detects the state of the exclusive DC charging module of the charging gun N. If it is in the standby mode, it is turned on; if the DC charging module is in the working state, the switch module is closed to send a message to the N main control module that the working state has changed to working; S203, the power control module determines whether it has received the power adjustment instruction sent by the Nth master control module, if it has received it, execute S204, if not, execute S205; S204, the power control module executes the power allocation algorithm to determine whether the newly calculated allocation result is consistent with the previously running one. If they are consistent, the DC charging module is not adjusted on and off, and the switch module is not adjusted on and off; if they are inconsistent, the DC charging module is judged and processed on and off. After the corresponding DC charging module switch module is adjusted, the power allocation is completed; S205, the power control module determines whether it has received the stop charging instruction sent by the Nth master control module, and if so, executes S206, and if not, executes S201; S206, shut down the DC charging module that provides power output to the Nth gun. First, the power control module detects the mode of the DC charging module that provides power output to the Nth charging gun. If it is in the working mode, send a shutdown command to the DC charging module and send a disconnection command to the switch module connected to the charging. If it is in the standby state and the switch module is in the disconnected state, send a message to the Nth main control module that the working state is changed to the standby state. S207, charging of gun N is completed.

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