A reactive power compensation method and device for an electric vehicle charging pile and a medium

Abstract

The application discloses a reactive power compensation method and device for electric vehicle charging piles, and a medium, and relates to the technical field of electric vehicle charging. The method comprises the following steps: for each charging gun access point of the electric vehicle charging pile, the corresponding node voltage is monitored in real time, and the voltage state is determined. The voltage state comprises a normal state, a capacitive state and an inductive state. According to the voltage state, the working mode corresponding to the charging gun access point is determined. Through the power factor calculation engine corresponding to the working mode, the target power factor is generated. Based on the target power factor, the operating parameters of the power converter corresponding to the charging gun access point are adjusted. The target power factor generated by the power factor calculation engine corresponding to the working mode is used to dynamically adjust the power factor of each charging gun, effectively cope with the voltage fluctuation of the power grid, and improve the stability of the power distribution network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicle charging, in particular to a reactive power compensation method and device for electric vehicle charging piles and a medium. BACKGROUND

[0002] With the wide popularity of electric vehicles, many regions have established electric vehicle charging stations, especially the multi-gun charging piles in public places to realize connection with the power grid and charging. The electric vehicle charging pile, as an energy interaction interface between the power grid and the electric vehicle, directly affects the reactive power balance of the power grid. Due to the uncertain charging time of users and the change of charging power with the battery state, when a large number of electric vehicles are connected to the power grid, the nonlinear characteristics of the charging pile and its load will introduce a large amount of reactive power demand, causing the node voltage of the power grid to frequently deviate, affecting the normal operation of other electrical equipment. Therefore, necessary reactive power compensation is needed.

[0003] Reactive power compensation is a technology that improves the power factor of the power grid, reduces the loss of power supply transformers and transmission lines, improves power supply efficiency, and improves the power supply environment. After installing reactive power compensation devices such as shunt capacitors in the power grid, the reactive power consumed by inductive loads can be provided, reducing the reactive power provided by the power grid to inductive loads and transported by the line, and reducing the power loss of the line and transformer due to the transportation of reactive power.

[0004] The traditional reactive power compensation method is realized by traditional reactive power compensation devices such as shunt capacitor compensation, shunt reactor compensation, static var generator (SVG), static var compensator (SVC), etc., which is difficult to adaptively adjust the compensation direction to cope with the randomness and volatility of electric vehicle charging, and is prone to problems such as unstable grid voltage and increased transmission line loss. SUMMARY

[0005] In order to solve the above problems, the present application provides a reactive power compensation method for electric vehicle charging piles, applied to an electric vehicle charging pile controller, comprising:

[0006] Real-time monitoring of the node voltage corresponding to each charging gun access point of the electric vehicle charging pile to determine the voltage state; the voltage state includes normal state, capacitive state and inductive state;

[0007] According to the voltage state, determine the working mode corresponding to the charging gun access point;

[0008] Generate a target power factor through the power factor calculation engine corresponding to the working mode;

[0009] Based on the target power factor, adjust the operating parameters of the power converter corresponding to the charging gun access point.

[0010] In another aspect, the present application also provides a reactive power compensation device for an electric vehicle charging pile, comprising:

[0011] at least one processor; and,

[0012] a memory in communication with the at least one processor; wherein,

[0013] the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform a reactive power compensation method for an electric vehicle charging pile as described in the above examples.

[0014] In another aspect, the present application also provides a non-volatile computer storage medium storing computer executable instructions, which are configured to perform a reactive power compensation method for an electric vehicle charging pile as described in the above examples.

[0015] The reactive power compensation method for an electric vehicle charging pile proposed by the present application can bring the following beneficial effects:

[0016] Through real-time monitoring and accurate filtering processing of the voltage of each charging gun access point node, the subtle fluctuations of the power grid voltage can be quickly captured, and based on the normal, capacitive and inductive three voltage states divided by the preset threshold range, the charging pile can perceive the power grid state change in the first time. The voltage state and the working mode are clearly mapped, and when the power grid is in different voltage states, the charging pile can quickly switch to the corresponding working mode, thereby enhancing the adaptability of the charging pile to complex power grid environment.

[0017] The target power factor generated by the power factor calculation engine corresponding to the working mode not only meets the reactive power compensation demand of the power grid, but also guarantees the charging efficiency of the electric vehicle, thereby avoiding the decline of charging power caused by excessive compensation. By dynamically adjusting the power factor of each charging gun, the power grid voltage fluctuation is effectively coped with, and the stability of the distribution network is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 is a flowchart of a reactive power compensation method for an electric vehicle charging pile in an embodiment of the present application;

[0020] Figure 2 is a node voltage adjustment principle diagram of each charging pile access point of an electric vehicle charging pile in an embodiment of the present application;

[0021] Figure 3 Fig. 1 is a schematic diagram of an equivalent model of a power distribution network in an embodiment of the present application;

[0022] Figure 4 Fig. 2 is a schematic diagram of a power factor optimization model in an embodiment of the present application;

[0023] Figure 5 Fig. 3 is a schematic diagram of a reactive power compensation device of an electric vehicle charging pile in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in detail with reference to the embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0025] The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the drawings.

[0026] As shown in Figure 1 The embodiments of the present application provide a reactive power compensation method for an electric vehicle charging pile, which comprises:

[0027] S101: Real-time monitoring of the node voltage corresponding to each charging gun access point of the electric vehicle charging pile, and determining the voltage state; the voltage state comprises a normal state, a capacitive state and an inductive state.

[0028] Specifically, through the voltage sensor pre-built on each charging gun access point of the electric vehicle charging pile, the voltage signal of the node voltage of each charging gun access point is sampled in real time, the sampled voltage signal is digitally filtered and feature extracted, the voltage amplitude and phase features are obtained, and the processed voltage features are compared with the preset rated voltage interval based on the power distribution network operation standard.

[0029] If the voltage features are within the preset rated voltage interval, it is determined as the normal state; if the voltage features are higher than the upper threshold of the preset rated voltage interval, it is determined as the capacitive state; if the voltage features are lower than the lower threshold of the preset rated voltage interval, it is determined as the inductive state.

[0030] For the capacitive state or the inductive state, further according to the node voltage of the charging gun access point, a sub-state is determined, when the node voltage is higher than a preset capacitive load voltage threshold, it is determined that the capacitive load state is in; when the node voltage is lower than the preset capacitive load voltage threshold, it is determined that the corresponding charging gun access point is in the capacitive limit state; when the node voltage is lower than a preset inductive load voltage threshold, it is determined that the corresponding charging gun access point is in the inductive load state; when the node voltage is higher than the preset inductive load voltage threshold, it is determined that the corresponding charging gun access point is in the inductive limit state.

[0031] In the embodiment of the application, the sub-state can also be determined according to whether the charging current of the charging gun access point is zero, if the charging current is not zero, it is determined to be a load state (capacitive load or inductive load); if the charging current is zero, it is determined to be a limit state (capacitive limit or inductive limit). Wherein, in the capacitive load state, the charging gun keeps charging and outputs capacitive reactive power, in the capacitive limit state, only capacitive reactive power is output, in the inductive load state, charging is kept and inductive reactive power is output, and in the inductive limit state, only inductive reactive power is output.

[0032] It should be noted that, as shown in Figure 2 , the state S1 is the charging state in the ideal case, the operating power factor in this state is 1, and no reactive power exchange with the power grid; S2 and S3 are respectively the capacitive and inductive load states of the charging pile, a part of the charging active power is reduced to exchange reactive power with the power grid; S4 and S5 are respectively the capacitive and inductive limit modes of the charging pile, at this time the operating power factor of the charging is 0, the electric vehicle is no longer charged, and only exchanges reactive power with the power grid.

[0033] When the grid voltage is low, the operating power factor of the charging pile is adjusted to work in the state of S2 or S4, the inductive reactive power is absorbed from the electric vehicle side, that is, the inductive reactive power is sent to the power grid, and the voltage on the power grid side is improved; on the contrary, when the grid voltage is high, the charging works in the state of S3 or S5, the inductive reactive power is sent to the electric vehicle side to absorb the excess inductive reactive power on the power grid side, so as to reduce the voltage of the power grid and keep it within the safe and stable specified range.

[0034] It should be noted that, in the embodiment of the application, for the process of determining the voltage state corresponding to the charging gun access point, the equivalent model of the distribution network can also be used to realize. Specifically, as shown in Figure 3 , the equivalent model of the distribution network is constructed, when the electric vehicle accesses the power grid node, the electric vehicle and the load consuming reactive power are regarded as terminals, and in the model , , represents the output voltage of the power grid side; , , represents the load current; , , represents the input current of the charging pile. The equivalent model of the distribution network includes: the grid-side output voltage vector ; the line impedance matrix , where R is the line resistance and X is the line reactance; the load current vector ; and the charging gun input current vector .

[0035] Based on the equivalent model of the distribution network, the node voltage of each charging gun access point is calculated, and the formula is: where is the head voltage, , is the end active and reactive power, is the charging active power, is the charging reactive power (positive for inductive and negative for capacitive). According to the deviation of the node voltage from the rated voltage , the voltage state is determined, when , it is normal state; when , it is inductive state; when , it is capacitive state.

[0036] S102: According to the voltage state, the working mode corresponding to the charging gun access point is determined.

[0037] Specifically, a preset mapping rule of voltage state and working mode is established, and through the preset mapping rule, the corresponding working mode is determined according to the voltage state.

[0038] Wherein, the preset mapping rule is: the normal state corresponds to the pure charging mode, at this time the charging gun only performs active power transmission; the capacitive load state corresponds to the charging capacitive compensation mode, at this time the charging gun keeps charging and outputs capacitive reactive; the capacitive limit state corresponds to the pure capacitive compensation mode, at this time the charging gun stops charging and only outputs capacitive reactive; the inductive load state corresponds to the charging inductive compensation mode, at this time the charging gun keeps charging and outputs inductive reactive; the inductive limit state corresponds to the pure inductive compensation mode, at this time the charging gun stops charging and only outputs inductive reactive.

[0039] Through the mapping rule, the real-time monitored voltage state is converted into the corresponding working mode, wherein the distinction between the capacitive load state and the capacitive limit state is based on whether there is a charging current in the charging gun, and the distinction between the inductive load state and the inductive limit state is based on the same principle.

[0040] S103: Generate the target power factor through the power factor calculation engine corresponding to the working mode.

[0041] Specifically, the current working mode, node voltage deviation and charging power demand information of the charging gun access point are acquired. Based on the pre-stored mapping relationship between the working mode and the power factor adjustment interval, an initial power factor adjustment range is determined, wherein the capacitive load state and the capacitive limit state correspond to different adjustment intervals, and the inductive load state and the inductive limit state are the same.

[0042] When the working mode is a non-charging compensation mode, a target power factor is determined based on the preset mapping relationship between the working mode and the power factor, and the non-charging compensation mode includes a pure charging mode, a pure capacitive compensation mode and a pure inductive compensation mode; when the working mode is a charging compensation mode, a dynamic power factor calculation is performed to determine a power factor adjustment range, and the charging compensation mode includes a charging capacitive compensation mode and a charging inductive compensation mode.

[0043] When the working mode is a charging compensation mode, the critical value of the power factor adjustment interval is adjusted according to the preset charging efficiency constraint condition and the preset power grid voltage adjustment constraint condition, so as to ensure that the active power is not lower than the minimum working demand, and the interval boundary is dynamically adjusted according to the voltage deviation degree.

[0044] Specifically, the resistance component and the reactance component of the charging gun access point are acquired, the ratio relationship between the resistance component and the reactance component is determined, and the critical value of the power factor adjustment interval is calculated according to the ratio relationship; the critical value and the resistance component have a positive correlation, and the critical value and the reactance component have a negative correlation; when the resistance component accounts for more than the reactance component, the critical value tends to a first limit value; when the reactance component accounts for more than the resistance component, the critical value tends to a second limit value, and the first limit value is greater than the second limit value.

[0045] In the embodiments of the present application, as shown in Figure 4 , a power factor optimization model is constructed, and a target function is defined based on the equivalent model of the power distribution network and a node voltage calculation formula: , wherein, , , is a weight coefficient, is a rated charging power, is a target reactive compensation amount.

[0046] Constraint conditions are applied to the target function: in an inductive mode , wherein is the power factor corresponding to the voltage extreme point; in a capacitive mode ; charging power constraint: , is a minimum charging power threshold. The target function is solved by a Lagrange multiplier method or a gradient descent algorithm to generate an optimal power factor critical value.

[0047] S104: Adjust the operating parameters of the power converter corresponding to the charging gun access point based on the target power factor.

[0048] Specifically, the real-time phase angle of the grid voltage is obtained, which serves as a reference benchmark for current phase control. According to a preset mapping relationship between the target power factor and the phase difference, the target phase difference angle between the voltage and the current is calculated. The target phase difference angle is superimposed on the real-time phase angle of the grid voltage to generate the target phase angle of the power converter output current.

[0049] Further, based on the target phase angle, a drive signal for controlling the on-off timing of the switching devices in the power converter is generated, including a PWM pulse sequence or a space vector modulation signal. Through a closed-loop feedback mechanism, the actual phase angle of the power converter output current is monitored in real time and compared with the target phase angle. According to the comparison result, the phase parameters of the drive signal are dynamically adjusted until the actual phase angle converges within the target phase angle range. During the adjustment process, the switching frequency and the modulation ratio of the power converter are simultaneously adjusted to maintain the stability of the DC side voltage and suppress harmonic components.

[0050] In the embodiments of the present application, when the working mode is the pure charging mode, the switching frequency and the modulation ratio of the power converter are controlled to achieve the power factor , and the specific parameter adjustment is as follows: , where is the reference switching frequency, is the reference modulation ratio, is the DC side voltage, and is the AC side voltage.

[0051] When the working mode is the charging capacitive compensation mode or the charging inductive compensation mode, the power factor is adjusted by adjusting the phase angle of the power converter: , where is the optimal power factor, and the switching frequency and the modulation ratio are simultaneously adjusted to maintain the stability of the DC side voltage; when the working mode is the pure capacitive compensation mode or the pure inductive compensation mode, the power converter enters the special mode of reactive power compensation, stops the output of the charging current, and only outputs the reactive current.

[0052] The application can quickly capture the slight fluctuation of the power grid voltage through real-time monitoring and accurate filtering processing of the voltage of each charging gun access point node, and based on the normal, capacitive and inductive three voltage states divided by the preset threshold range, the charging pile can perceive the power grid state change in the first time. The voltage state and the working mode are established to have a clear mapping relationship, and when the power grid is in different voltage states, the charging pile can quickly switch to the corresponding working mode, thereby enhancing the adaptability of the charging pile to the complex power grid environment.

[0053] The target power factor generated by the power factor calculation engine corresponding to the working mode not only meets the power grid reactive power compensation demand, but also guarantees the charging efficiency of the electric vehicle, thereby avoiding the decline of the charging power caused by excessive compensation. By dynamically adjusting the power factor of each charging gun, the power grid voltage fluctuation is effectively coped with, and the distribution network stability is improved.

[0054] As shown in Figure 5 The application embodiment further provides a reactive power compensation device of an electric vehicle charging pile, which comprises:

[0055] at least one processor; and

[0056] a memory in communication connection with the at least one processor; wherein

[0057] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the reactive power compensation method of the electric vehicle charging pile according to any one of the above embodiments.

[0058] The application embodiment further provides a non-volatile computer storage medium, which stores computer executable instructions, and the computer executable instructions are configured to execute the reactive power compensation method of the electric vehicle charging pile according to any one of the above embodiments.

[0059] Each of the embodiments in the application is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment mainly describes the difference from other embodiments. Especially, the device and medium embodiments are basically similar to the method embodiments, so the description is relatively simple, and the related parts can be referred to the part of the method embodiment.

[0060] The device and medium provided by the application embodiment are one-to-one corresponding to the method, so the device and medium also have the similar beneficial technical effects as the corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device and medium will not be described here.

[0061] Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0062] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0063] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0064] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more functions specified in the flowchart block or blocks. Figure 1 means for functionally implementing one or more functions specified in the flowchart block or blocks.

[0065] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0066] The memory can include non-persistent memory and / or persistent memory, such as flash memory, read-only memory (ROM), and / or volatile or non-volatile random access memory (RAM), among others. The memory is an example of computer readable media.

[0067] Computer-readable media includes permanent and non-permanent, movable and non-movable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device. According to the definition herein, computer-readable media does not include transitory media such as modulated data signals and carriers.

[0068] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus that includes a list of elements does not only include those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0069] The above only describes the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of claims of the present application.

Claims

1. A reactive power compensation method for electric vehicle charging piles, characterized in that, Applications in electric vehicle charging pile controllers include: For each charging gun connection point of an electric vehicle charging pile, the corresponding node voltage is monitored in real time to determine the voltage status; the voltage status includes normal status, capacitive status, and inductive status. Based on the voltage state, determine the operating mode corresponding to the charging gun access point; The target power factor is generated using the power factor calculation engine corresponding to the operating mode. Based on the target power factor, the operating parameters of the power converter corresponding to the charging gun access point are adjusted; The method for monitoring the voltage at each charging gun connection point of an electric vehicle charging pile in real time and determining the voltage status specifically includes: By using voltage sensors pre-deployed at each charging gun access point of the electric vehicle charging pile, the corresponding node voltage is collected in real time to determine whether the node voltage is within the preset rated voltage range. When the node voltage is within the preset rated voltage range, it is determined that the corresponding charging gun connection point is in a normal state; When the node voltage is lower than the lower limit threshold of the preset rated voltage range, it is determined that the corresponding charging gun connection point is in a capacitive state, and the node voltage is compared with the preset capacitive load voltage threshold. When the node voltage is higher than the preset capacitive load voltage threshold, it is determined that the corresponding charging gun connection point is in a capacitive load state; When the node voltage is lower than the preset capacitive load voltage threshold, the corresponding charging gun connection point is determined to be in a capacitive limit state. When the node voltage is higher than the upper limit threshold of the preset rated voltage range, it is determined that the corresponding charging gun connection point is in an inductive state, and the node voltage is compared with the preset inductive load voltage threshold. When the node voltage is lower than the preset inductive load voltage threshold, it is determined that the corresponding charging gun connection point is in an inductive load state; When the node voltage is higher than the preset inductive load voltage threshold, it is determined that the corresponding charging gun connection point is in an inductive limit state. The step of determining the operating mode corresponding to the charging gun connection point based on the voltage state specifically includes: When the charging gun connection point is in normal condition, the current pure charging mode is maintained; When the charging gun connection point is in a capacitive load state, the charging capacitive compensation mode is triggered. When the charging gun connection point is in a capacitive limit state, the pure capacitive compensation mode is triggered. When the charging gun connection point is in an inductive load state, the charging inductive compensation mode is triggered. When the charging gun connection point is in an inductive limit state, the pure inductive compensation mode is triggered. The step of generating the target power factor through the power factor calculation engine corresponding to the operating mode specifically includes: When the operating mode is a non-charging compensation mode, the target power factor is determined based on the preset mapping relationship between the operating mode and the power factor; the non-charging compensation mode includes the pure charging mode, the pure capacitive compensation mode, and the pure inductive compensation mode. When the operating mode is charging compensation mode, dynamic power factor calculation is performed to determine the power factor adjustment range; the charging compensation mode includes the charging capacitive compensation mode and the charging inductive compensation mode; The process of performing dynamic power factor calculation and determining the power factor adjustment range specifically includes: Obtain the line impedance parameters of the charging gun connection point and calculate the critical value of the power factor adjustment range; Based on preset charging efficiency constraints and preset grid voltage regulation constraints, the critical value is adjusted to obtain the power factor regulation range.

2. The reactive power compensation method for an electric vehicle charging pile according to claim 1, characterized in that, The step of obtaining the line impedance parameters of the charging gun connection point and calculating the critical value of the power factor adjustment range specifically includes: Obtain the resistance and reactance components of the charging gun connection point, and determine the ratio between the resistance and reactance components. Based on the ratio relationship, the critical value of the power factor adjustment range is calculated; the critical value is positively correlated with the resistance component and negatively correlated with the reactance component. When the proportion of the resistance component is higher than that of the reactance component, the critical value approaches the first limit value; When the proportion of the reactance component is higher than that of the resistance component, the critical value approaches the second limit value, and the first limit value is greater than the second limit value.

3. The reactive power compensation method for an electric vehicle charging pile according to claim 1, characterized in that, The adjustment of the operating parameters of the power converter corresponding to the charging gun connection point based on the target power factor specifically includes: Obtain the real-time phase angle of the grid voltage corresponding to the charging gun connection point; Calculate the target phase difference angle between the current and the grid voltage based on the target power factor and the preset phase difference mapping relationship; The target phase difference angle is superimposed on the real-time phase angle of the grid voltage to generate the target phase angle of the power converter output current; A drive signal is generated based on the target phase angle, and the output current parameters of the power converter are controlled by the drive signal.

4. The reactive power compensation method for an electric vehicle charging pile according to claim 3, characterized in that, After generating a drive signal based on the target phase angle and controlling the output current parameters of the power converter through the drive signal, the method further includes: The actual phase angle of the power converter output current is monitored in real time through a closed-loop feedback mechanism and compared with the target phase angle. Adjust the phase parameters of the driving signal based on the comparison results until the actual phase angle converges to the target phase angle range.

5. A reactive power compensation device for an electric vehicle charging pile, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform a reactive power compensation method for an electric vehicle charging station as described in any one of claims 1 to 4.

6. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are configured to execute a reactive power compensation method for an electric vehicle charging pile as described in any one of claims 1 to 4.

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