Charging station, MW over-charging power station and power supply control method

Abstract

The invention provides a charging station, an MW (megawatt) over-charging station and a power supply control method, and relates to the technical field of charging station power supply control, the charging station comprises a central rectifier and a plurality of groups of common charging piles, each common charging pile comprises a first power converter, a second power converter, a third power converter and a fourth power converter, a first parallel branch is connected between the output ends of the first power converters in different groups, and a first controllable switch is arranged on the first parallel branch; and the input end of the first charging gun is connected to the output end of the first power converter, and a second controllable switch is arranged between the input end of the first charging gun and the output end of the first power converter. The energy waste of the charging station can be reduced, the energy utilization rate is improved, and the practicability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging station power supply control, in particular to a charging station, an MW super-charging charging station and a power supply control method. BACKGROUND

[0002] When providing power supply for traditional electric vehicles, a charging pile is generally used as a special device, which transmits power in the power grid to the power battery of the electric vehicle to realize the recovery of the vehicle's endurance, and is an indispensable basic device in the electric vehicle industry chain. In order to facilitate the travel of electric vehicles, charging stations integrating a large number of charging piles are currently built in various regions, so that electric vehicles can find nearby charging stations for charging when the power is low.

[0003] In the charging station located in the low-temperature area of high altitude and high latitude, in order to ensure that all charging piles arranged inside can normally operate, it is usually necessary to heat all charging piles inside, so that they are all in standby mode, so that the vehicle can be charged immediately when the vehicle arrives. However, in some specific dates or time periods of a day, for example, the charging station of a tourist attraction located in the plateau in the off-season or at night, there may be less traffic. If all charging piles are kept in standby mode, it will cause energy waste. SUMMARY

[0004] In order to solve the above-mentioned defects of the related prior art, the present application provides a charging station, an MW super-charging charging station and a power supply control method, which can reduce the energy waste of the charging station, improve the energy utilization rate, and have strong practicality.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technology: A charging station, comprising a central rectifier and a plurality of ordinary charging piles, the ordinary charging piles comprising a plurality of groups, and each group comprising: A first power converter, the input end of which is connected to the output end of the central rectifier, and the output ends of the first power converters of different groups are all connected with a first parallel branch, and a first controllable switch is arranged on the first parallel branch; A first charging gun, the input end of which is connected to the output end of the first power converter, and a second controllable switch is arranged between the input end of the first charging gun and the output end of the first power converter.

[0006] A charging station power supply control method for controlling the power supply of the charging station, comprising the steps of: The same group of ordinary charging piles is numbered in order as 1~X, and a variable value R is introduced; The second controllable switch of the first ordinary charging pile in each group of ordinary charging piles is closed, and the remaining first controllable switch and second controllable switch are all in the open state. When a vehicle arrives, guide the vehicle to the Nth ordinary charging pile with the second controllable switch in the closed state; Determine whether N is equal to X; if not, R=N+1; if yes, R=1; When charging, close the first controllable switch between the Nth ordinary charging pile and the Rth ordinary charging pile, provide power for the first charging gun of the Nth ordinary charging pile through the first power converter of the Nth ordinary charging pile and the first power converter of the Rth ordinary charging pile, and charge the vehicle through the first charging gun of the Nth ordinary charging pile; After charging is completed, open the second controllable switch of the Nth ordinary charging pile, open the first controllable switch between the Nth ordinary charging pile and the Rth ordinary charging pile, and close the second controllable switch of the Rth ordinary charging pile.

[0007] A MW super-charging charging station, comprising the charging station and at least one MW super-charging charging pile, the MW super-charging charging pile comprising: A second power converter, the input end of which is connected to the central rectifier, and the output end of the second power converter is connected with the output end of the first power converter, and a second parallel branch is arranged between the output end of the second power converter and the output end of the first power converter, and a third controllable switch is arranged on the second parallel branch; A second charging gun, the input end of which is connected to the output end of the second power converter, and a fourth controllable switch is arranged between the input end of the second charging gun and the output end of the second power converter.

[0008] A power supply control method of a MW super-charging charging station, used for power supply control of the MW super-charging charging station, the method comprising the steps of: Close the fourth controllable switch of each MW super-charging charging pile, and the remaining first controllable switch, second controllable switch and third controllable switch are in the open state; When an ordinary charging pile arrives, open the fourth controllable switch of the Mth MW super-charging charging pile, close the third controllable switch between the Mth MW super-charging charging pile and the current arriving ordinary charging pile, and close the second controllable switch of the current arriving ordinary charging pile, provide power for the first charging gun of the current arriving ordinary charging pile through the second power converter of the Mth MW super-charging charging pile and the first power converter of the current arriving ordinary charging pile, and charge the vehicle through the first charging gun of the current arriving ordinary charging pile; after charging is completed, open the third controllable switch between the Mth MW super-charging charging pile and the current arriving ordinary charging pile, and open the second controllable switch of the current arriving ordinary charging pile, and close the fourth controllable switch of the Mth MW super-charging charging pile again; When the MW super-charging pile comes, the second power converter of the current MW super-charging pile is directly used to provide power, and the second charging gun of the current MW super-charging pile is used to charge the vehicle.

[0009] The application has the advantages that: By grouping and parallelly connecting multiple charging piles and making the charging piles be used in turns, only one charging pile in each group is kept in a standby state, and the rest of the charging piles are in a low-power-consumption state, so that the overall energy consumption is reduced; in the charging station with MW super-charging piles, by parallelly connecting the MW super-charging piles and the ordinary charging piles, the ordinary charging piles are in a low-power-consumption state in the period of low temperature and low use frequency, so that the overall energy consumption is further reduced, and the energy utilization rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 Fig. 1 is a structural schematic diagram of a charging station according to an embodiment of the application.

[0011] Figure 2 Fig. 2 is a flowchart of a power supply control method of the charging station according to an embodiment of the application.

[0012] Figure 3 Fig. 3 is a flowchart of the first power converter in parallel connection when providing power according to an embodiment of the application.

[0013] Figure 4 Fig. 4 is a structural schematic diagram of a MW super-charging station according to an embodiment of the application. Figure 1 .

[0014] Figure 5 Fig. 5 is a structural schematic diagram of a MW super-charging station according to an embodiment of the application. Figure 2 .

[0015] Figure 6 Fig. 6 is a flowchart of a power supply control method of the MW super-charging station according to an embodiment of the application.

[0016] Figure 7 Fig. 7 is a flowchart of the first power converter and the second power converter in parallel connection when providing power according to an embodiment of the application.

[0017] Figure 8 Fig. 8 is a working state schematic diagram of the charging station when charging according to an embodiment of the application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the embodiments of the application will be described in detail below with reference to the drawings, but the described embodiments of the application are only part of the embodiments of the application, not all the embodiments of the application.

[0019] As Figure 1 shown in the drawings, one aspect of the embodiments of the present application provides a charging station, comprising a central rectifier and a plurality of ordinary charging piles, wherein the ordinary charging piles are grouped, and each ordinary charging pile comprises a first power converter and a first charging gun.

[0020] Specifically, as Figure 1 shown in the drawings, the input end of the first power converter is connected to the output end of the central rectifier, and the output ends of different first power converters are connected by a first parallel branch, and a first controllable switch is arranged on the first parallel branch to realize the parallel use of any number of first power converters.

[0021] Specifically, as Figure 1 shown in the drawings, the input end of the first charging gun is connected to the output end of the first power converter, and a second controllable switch is arranged between the input end of the first charging gun and the output end of the first power converter.

[0022] In this way, the central rectifier is used to provide power for the entire charging station, the first power converter is used to provide power for the first charging gun on the ordinary charging pile and the heater and other components inside the ordinary charging pile, and the second controllable switch is used to control the communication between the first power converter and the first charging gun and the heater and other components inside the ordinary charging pile.

[0023] Preferably, as Figure 1 shown in the drawings, the ordinary charging piles in the same group are arranged in a line, and the first parallel branch is arranged between the ordinary charging piles in the same group and adjacent to each other, and between the ordinary charging piles at both ends of the linear arrangement; in this way, the wiring of the first parallel branch can be more orderly, which is convenient for subsequent fault diagnosis and line maintenance.

[0024] As Figure 2 shown in the drawings, another aspect of the embodiments of the present application provides a charging station power supply control method for controlling the power supply of the charging station described in the foregoing embodiments, the method comprising the steps of: S110, numbering the ordinary charging piles in the same group in order as 1~X, and introducing a variable value R.

[0025] S120, closing the second controllable switch of the first ordinary charging pile in each group of ordinary charging piles, and keeping the rest of the first controllable switch and the second controllable switch in an open state.

[0026] S130, when a vehicle arrives, guiding the vehicle to the Nth ordinary charging pile with the second controllable switch in a closed state.

[0027] S140, judging whether N is equal to X; and when judging as no, R=N+1; and when judging as yes, R=1.

[0028] S150, when charging, the first controllable switch between the Nth ordinary charging pile and the Rth ordinary charging pile is closed, the first power converter of the Nth ordinary charging pile and the first power converter of the Rth ordinary charging pile provide power for the first charging gun of the Nth ordinary charging pile, and the first charging gun of the Nth ordinary charging pile charges the vehicle.

[0029] S160, after charging, the second controllable switch of the Nth ordinary charging pile is opened, the first controllable switch between the Nth ordinary charging pile and the Rth ordinary charging pile is opened, and the second controllable switch of the Rth ordinary charging pile is closed.

[0030] When the ambient temperature is lower than the set threshold value and the charging station is in a low-frequency use time period, that is, in a low-temperature energy-saving management mode, that is, the charging station power supply control method of the embodiment of the application; in this mode, at least one ordinary charging pile in each group of ordinary charging piles will be in a standby use mode, that is, the second controllable switch of the ordinary charging pile in S120 is in a closed state, the internal heater and other parts are in a working state, and the first charging gun is in a connected state, which can charge the vehicle at any time; and the remaining ordinary charging piles are in a low-power consumption mode, that is, the remaining second controllable switches are in an open state; such design can effectively reduce the total power consumption of the charging station in a low-temperature and low-frequency use time period, so as to achieve the purpose of energy saving.

[0031] However, if the ordinary charging pile in the low-power consumption mode is not used for a long time at low temperature, it may cause power-on abnormality and other failure conditions when used next time, so the embodiment of the application adopts a mode of parallel operation of multiple groups of power converters to solve this problem.

[0032] In this mode, the first power converter of one ordinary charging pile in the standby use mode is connected in parallel with the first power converter of at least one ordinary charging pile in the low-power consumption mode through the first controllable switch on the first parallel branch, that is, the first controllable switch between the Nth ordinary charging pile and the Rth ordinary charging pile in S150 is closed; and another ordinary charging pile in the low-power consumption mode is activated to charge the same vehicle together, that is, the first power converter of the Nth ordinary charging pile and the first power converter of the Rth ordinary charging pile provide power for the first charging gun of the Nth ordinary charging pile, and the first charging gun of the Nth ordinary charging pile charges the vehicle, at this time, the working state of the charging station is as shown in Figure 8 , Figure 8 The arrow indicates the direction of current flow.

[0033] When a common charging pile is working, another common charging pile will be preheated; and when the charging is completed, the common charging pile that has completed the charging will return to the low-power state from the standby state, and at this time the other common charging pile will complete the preheating and keep the standby state to welcome the next vehicle, that is, as described in S160, the second controllable switch of the Nth common charging pile is disconnected, and the first controllable switch between the Nth common charging pile and the Rth common charging pile is disconnected.

[0034] In this way, the common charging pile can be switched once for each vehicle, so that each common charging pile can get the opportunity to work, and the common charging pile can avoid failure caused by long-term non-use in low temperature.

[0035] The numbering and variable value introduced in S110 and the judgment in S140 are used to make the common charging piles in the same group work in a cycle, so as to further ensure that each common charging pile can get the opportunity to work.

[0036] Further preferably, in S130, the light guiding mode can be used to guide the vehicle to the Nth common charging pile with the second controllable switch in the closed state.

[0037] Further preferably, regarding the grouping of the common charging piles in the charging station, the number of groups can be determined according to the vehicle flow size in the low-temperature and low-frequency use period. The larger the vehicle flow, the more the groups.

[0038] Preferably, as shown in Figure 3 When the first power converter of the Nth common charging pile and the first power converter of the Rth common charging pile provide power for the first charging gun of the Nth common charging pile, the method further comprises the steps of: S151, first providing power through the first power converter of the Nth common charging pile.

[0039] S152, gradually reducing the power of the first power converter of the Nth common charging pile and gradually increasing the power of the first power converter of the Rth common charging pile.

[0040] S153, when the power of the first power converter of the Nth common charging pile is equal to the power of the first power converter of the Rth common charging pile, the current total power is kept unchanged until the charging is completed.

[0041] Since the power converter of the ordinary charging pile in the low-power mode is just activated, it needs to be preheated by the first power converter of the ordinary charging pile in the standby mode, therefore, the preferred solution of the embodiment of the application adopts a power distribution adjustment solution for the two parallel first power converters in the starting stage of parallel operation of the first power converters, that is, the power is mainly provided by the first power converter in the standby mode first, then the power is gradually reduced, while the parallel first power converter synchronously increases the power, until the power of the two first power converters is equal; in this way, the just-activated power converter can be gradually preheated, which is more friendly to the service life of the device.

[0042] Preferably, the starting stage of parallel operation of the first power converter is a pre-charging stage, and the required charging current in this stage is relatively small compared with that in normal charging, that is, the current total power when the first power converter of the Nth ordinary charging pile starts to gradually reduce the power is less than the current total power when the power of the first power converter of the Nth ordinary charging pile is unchanged; pre-charging is a prior art, which is mainly because in a low-temperature environment, the vehicle needs to gradually adapt to the charging current; and selecting the pre-charging stage as the power distribution adjustment in the parallel operation of the first power converter can make the preheating of the just-activated power converter more moderate.

[0043] As shown in Figure 4 and Figure 5 , in another aspect of the application, a MW super-charging charging station is provided, which comprises the charging station and at least one MW super-charging charging pile as described above, wherein the MW super-charging charging pile comprises a second power converter and a second charging gun.

[0044] Specifically, as shown in Figure 4 and Figure 5 , the input end of the second power converter is connected to the central rectifier, and the output end of the second power converter and the output end of the first power converter are both connected with a second parallel branch, and a third controllable switch is arranged on the second parallel branch, for realizing the parallel use of the second power converter and any first power converter.

[0045] Specifically, as shown in Figure 5 , the input end of the second charging gun is connected to the output end of the second power converter, and a fourth controllable switch is arranged between the input end of the second charging gun and the output end of the second power converter.

[0046] In this way, the central rectifier is used to provide power for the entire MW super-charging charging station, the second power converter is used to provide power for the second charging gun of the MW super-charging charging pile and the heaters and other components inside the MW super-charging charging pile, and the fourth controllable switch is used to control the communication of the second power converter and the second charging gun and the heaters and other components inside the MW super-charging charging pile.

[0047] Preferred, such as Figure 4 As shown, the ordinary charging piles are divided into multiple teams with a number matching the MW supercharging piles. Each team of ordinary charging piles is matched with one MW supercharging pile, and the ordinary charging piles in the same group are all located in the same team. The second parallel branch is set between the matched MW supercharging piles and ordinary charging piles. This design makes the wiring of the second parallel branch more orderly, which is convenient for subsequent fault diagnosis and line maintenance.

[0048] like Figure 6 As shown, in another aspect of this application, a power supply control method for a MW supercharging station is provided for power supply control of the MW supercharging station described in the foregoing embodiments, comprising the following steps: S210. Close the fourth controllable switch of each MW supercharging pile, and keep the remaining first, second, and third controllable switches in the open state.

[0049] S220. When a vehicle arrives at a regular charging station, disconnect the fourth controllable switch of the Mth MW supercharging station, simultaneously close the third controllable switch between the Mth MW supercharging station and the regular charging station of the arriving vehicle, and close the second controllable switch of the regular charging station of the arriving vehicle. Power is supplied to the first charging gun of the regular charging station of the arriving vehicle through the second power converter of the Mth MW supercharging station and the first power converter of the regular charging station of the arriving vehicle, and the vehicle is charged through the first charging gun of the regular charging station of the arriving vehicle. After charging is completed, disconnect the third controllable switch between the Mth MW supercharging station and the regular charging station of the arriving vehicle, and disconnect the second controllable switch of the regular charging station of the arriving vehicle, and reclose the fourth controllable switch of the Mth MW supercharging station.

[0050] S230. When a vehicle arrives at a MW supercharger, power is directly supplied through the second power converter of the MW supercharger of the arriving vehicle, and the vehicle is charged through the second charging gun of the MW supercharger of the arriving vehicle.

[0051] MW super charging, namely megawatt super charging technology, refers to a fast charging technology with a charging power reaching one megawatt or above, which is generally used for vehicles such as heavy trucks that need a larger charging power for charging; since the MW super charging pile has a large power, and usually only one or two MW super charging piles are arranged in a charging station, if it is arranged in a low-power state like an ordinary charging pile, the preheating time required when it is enabled is longer, and when heavy vehicles such as heavy trucks can only be charged by MW super charging piles, the waiting time is also longer, so the MW super charging pile can be kept in a low-power state, that is, the fourth controllable switch of each MW super charging pile is closed in S210; the ordinary charging pile is in a low-power state when there is no car entering, that is, the second controllable switch of the ordinary charging pile is opened in S210; when a car charges through an ordinary charging pile, the corresponding first power converter is activated, that is, the second controllable switch of the current car's ordinary charging pile is closed in S220; at the same time, the ordinary charging pile and the corresponding MW super charging pile are connected in parallel to supply power to the vehicle together, that is, the third controllable switch between the Mth MW super charging pile and the current car's ordinary charging pile is closed in S220, and the first charging gun of the current car's ordinary charging pile is powered by the second power converter of the Mth MW super charging pile and the first power converter of the current car's ordinary charging pile, and the vehicle is charged through the first charging gun of the current car's ordinary charging pile.

[0052] In this way, when the ambient temperature is lower than the set threshold and the charging station is in a low-frequency use time period, the ordinary charging piles in the MW super charging station are in a low-power mode, and the MW super charging pile and the ordinary charging pile can quickly respond when a car arrives, thereby optimizing the power supply control and saving energy consumption while ensuring work efficiency.

[0053] Preferably, as shown in Figure 7 When the first charging gun of the current car's ordinary charging pile is powered by the second power converter of the Mth MW super charging pile and the first power converter of the current car's ordinary charging pile, the method further comprises the steps of: S221, first power is provided by the second power converter of the Mth MW super charging pile.

[0054] S222, gradually reduce the power of the second power converter of the Mth MW super charging pile, and gradually increase the power of the first power converter of the current car's ordinary charging pile.

[0055] S223, after the power of the first power converter of the ordinary charging pile of the current vehicle reaches the required power of the individual charging, the third controllable switch between the Mth MW super-charging pile and the ordinary charging pile of the current vehicle is opened, and the fourth controllable switch of the Mth MW super-charging pile is re-closed.

[0056] Wherein, the functions of S221 and S222 are the same as the related steps in the ordinary charging station, which are used for preheating the ordinary charging pile; but the difference lies in that after the preheating is completed, the second power converter of the MW super-charging pile will be withdrawn, so as to respond to the next vehicle as soon as possible, that is, as described in S223, after the power of the first power converter of the ordinary charging pile of the current vehicle reaches the required power of the individual charging, the third controllable switch between the Mth MW super-charging pile and the ordinary charging pile of the current vehicle is opened, and the fourth controllable switch of the Mth MW super-charging pile is re-closed.

[0057] Preferably, as shown in Figure 6 When the MW super-charging pile arrives, the method further comprises the steps of: S231, immediately close the second controllable switch of the Mth ordinary charging pile connected to the MW super-charging pile of the current vehicle through the second parallel branch.

[0058] When a heavy truck enters the charging station to use the MW super-charging pile for charging, one of the other ordinary charging piles is immediately selected into the standby mode, that is, as described in S231, the second controllable switch of the Mth ordinary charging pile connected to the MW super-charging pile of the current vehicle through the second parallel branch is immediately closed.

[0059] In this way, since the charging time of the heavy truck is relatively long, an ordinary charging pile needs to be immediately selected for preheating to respond to the subsequent vehicle; further preferably, during the time period when the MW super-charging pile is working, the preheated ordinary charging pile can be controlled by S110-S160 described above, that is, the ordinary charging pile drives the adjacent charging pile for preheating.

[0060] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. Obviously, those skilled in the art can make various modifications and changes to the present application without departing from the spirit and scope of the present application.

Claims

1. A charging station comprising a central rectifier and a plurality of normal charging piles, characterized in that, The common charging pile includes multiple groups, each of which includes: a first power converter, an input end of which is connected to an output end of the central rectifier, and a first parallel branch is connected between output ends of the first power converters of different groups, and a first controllable switch is arranged on the first parallel branch; a first charging gun, an input end of which is connected to an output end of the first power converter, and a second controllable switch is arranged between the input end of the first charging gun and the output end of the first power converter.

2. The charging station of claim 1, wherein, The common charging piles in the same group are arranged in a linear form, and the first parallel branch is arranged between the common charging piles in the same group and adjacent to each other and between the common charging piles at two ends of the linear form.

3. A power supply control method for a charging station, characterized by, A method for power supply control of the charging station as claimed in claim 1 or 2, comprising the steps of: numbering the common charging piles in the same group in order as 1~X, and introducing a variable value R; closing the second controllable switch of the first common charging pile in each group of common charging piles, and keeping the first controllable switch and the second controllable switch in the remaining common charging piles in an open state; when a vehicle arrives, guiding the vehicle to the Nth common charging pile at which the second controllable switch is in a closed state; judging whether N is equal to X; when the judgment is no, R=N+1; and when the judgment is yes, R=1; when charging, closing the first controllable switch between the Nth common charging pile and the Rth common charging pile, providing power for the first charging gun of the Nth common charging pile through the first power converter of the Nth common charging pile and the first power converter of the Rth common charging pile, and charging the vehicle through the first charging gun of the Nth common charging pile; after charging is completed, opening the second controllable switch of the Nth common charging pile, opening the first controllable switch between the Nth common charging pile and the Rth common charging pile, and closing the second controllable switch of the Rth common charging pile.

4. The charging station power supply control method according to claim 3, characterized by, when providing power through the first power converter of the Nth common charging pile and the first power converter of the Rth common charging pile for the first charging gun of the Nth common charging pile, further comprising the steps of: firstly providing power through the first power converter of the Nth common charging pile; gradually reducing the power of the first power converter of the Nth common charging pile and gradually increasing the power of the first power converter of the Rth common charging pile; when the power of the first power converter of the Nth common charging pile is equal to the power of the first power converter of the Rth common charging pile, keeping the current total power unchanged until charging is completed.

5. The charging station power supply control method according to claim 4, characterized by, The current total power when the first power converter of the Nth common charging pile starts to gradually reduce the power is less than the current total power when the power of the first power converter of the Nth common charging pile is unchanged.

6. A MW super-charging charging station, characterized by, The charging station as claimed in claim 1 or 2 and at least one MW super-charging pile, the MW super-charging pile comprising: a second power converter, an input end of which is connected to the central rectifier, and a second parallel branch is connected between an output end of the second power converter and an output end of the first power converter, and a third controllable switch is arranged on the second parallel branch; a second charging gun, an input end of which is connected to an output end of the second power converter, and a fourth controllable switch is arranged between the input end of the second charging gun and the output end of the second power converter.

7. The MW super-charging charging station of claim 6, wherein, The common charging pile is divided into multiple teams matched with the number of MW super charging piles, each team of common charging piles is matched with one MW super charging pile, and the common charging piles in the same team are located in the same team, and the second parallel branch is arranged between the matched MW super charging pile and the common charging pile.

8. A method for controlling power supply of a MW super-charging charging station, characterized in that, The method for power supply control of the MW super charging station as claimed in claim 6 or 7 comprises the steps of: The fourth controllable switch of each MW super charging pile is closed, and the first controllable switch, the second controllable switch and the third controllable switch are in an open state. When the common charging pile comes, the fourth controllable switch of the Mth MW super charging pile is opened, the third controllable switch between the Mth MW super charging pile and the current common charging pile is closed, and the second controllable switch of the current common charging pile is closed, power is provided to the first charging gun of the current common charging pile through the second power converter of the Mth MW super charging pile and the first power converter of the current common charging pile, and the vehicle is charged through the first charging gun of the current common charging pile; after charging, the third controllable switch between the Mth MW super charging pile and the current common charging pile is opened, and the second controllable switch of the current common charging pile is opened, and the fourth controllable switch of the Mth MW super charging pile is closed again. When the MW super charging pile comes, power is directly provided through the second power converter of the current MW super charging pile, and the vehicle is charged through the second charging gun of the current MW super charging pile.

9. The MW super-charging station power supply control method of claim 8, wherein, When power is provided to the first charging gun of the current common charging pile through the second power converter of the Mth MW super charging pile and the first power converter of the current common charging pile, the method further comprises the steps of: Power is first provided through the second power converter of the Mth MW super charging pile; The power of the second power converter of the Mth MW super charging pile is gradually reduced, and the power of the first power converter of the current common charging pile is gradually increased; When the power of the first power converter of the current common charging pile reaches the required power for separate charging, the third controllable switch between the Mth MW super charging pile and the current common charging pile is opened, and the fourth controllable switch of the Mth MW super charging pile is closed again.

10. The MW super-charging station power supply control method of claim 8, wherein, When the MW super charging pile comes, the second controllable switch of one of the common charging piles connected with the current MW super charging pile through the second parallel branch is immediately closed.

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