Control method of charging power unit, charging power unit, charging pile and medium

Abstract

The invention provides a control method of a charging power unit, the charging power unit, a charging pile and a medium, and relates to the technical field of power grids, the charging power unit comprises a phase-locked loop, the phase-locked loop comprises a controller, and the method comprises the following steps: obtaining a reactive component of an input voltage of the charging power unit; and under the condition that the reactive component exceeds the preset range, the current parameter of the controller is switched from the first parameter to the second parameter, so that the reactive component is adjusted to be within the preset range. According to the invention, rapid following of frequency can be realized, and the problems of bus voltage overcharge, current peak and the like are avoided.

Description

Technical Field

[0001] This application relates to the field of power grid technology, specifically to a control method for a charging power unit, a charging power unit, a charging pile, and a medium. Background Technology

[0002] During the charging process, the power grid may experience frequency jumps (such as rapid changes between 45Hz and 55Hz) due to sudden load changes, generator failures, or grid switching. If the charging pile is not adjusted in time, it is easy to encounter many problems that affect the stable operation of the charging pile, such as overcharging of the bus voltage, instantaneous peak current, and increased harmonics. Summary of the Invention

[0003] This application provides a control method for a charging power unit, a charging power unit, a charging pile, and a medium to solve the problem of frequency fluctuations affecting the stable operation of charging piles in the prior art.

[0004] In a first aspect, this application provides a control method for a charging power unit, the charging power unit including a phase-locked loop (PLL), the PLL including a controller, the method including:

[0005] Obtain the reactive component of the input voltage of the charging power unit;

[0006] If the reactive power exceeds the preset range, the controller's current parameter is switched from the first parameter to the second parameter so that the reactive power is adjusted to the preset range.

[0007] In some embodiments of this application, after the reactive power component is adjusted to a preset range, the method further includes:

[0008] Restore the controller's current parameters from the second parameter to the first parameter.

[0009] In some embodiments of this application, the method further includes:

[0010] If the reactive power component exceeds the preset range, reduce the output power of the charging power unit and cut off the drive waveform output of the charging power unit.

[0011] In some embodiments of this application, after restoring the controller's current parameter from the second parameter to the first parameter, the method further includes:

[0012] After the first duration, the reduced output power of the charging power unit is restored to its original value, and the drive waveform output of the charging power unit is restored.

[0013] In some embodiments of this application, after switching the controller's current parameter from a first parameter to a second parameter, the method includes:

[0014] If the output current of the charging power unit oscillates, the first duration is extended;

[0015] If the duration of the voltage drop of the charging power unit exceeds the duration threshold, the first duration is shortened.

[0016] In some embodiments of this application, when the reactive power component exceeds a preset range, switching the controller's current parameter from a first parameter to a second parameter includes:

[0017] If the reactive power component exceeds the preset range and continues for a second duration, the controller's current parameter will be switched from the first parameter to the second parameter.

[0018] Secondly, this application also provides a charging power unit, which includes:

[0019] Phase-locked loop (PLL), which includes a controller;

[0020] The control subunit is configured to acquire the reactive component of the input voltage of the charging power unit, and when the reactive component of the input voltage of the charging power unit exceeds a preset range, switch the current parameter of the controller from the first parameter to the second parameter so that the reactive component is adjusted to the preset range.

[0021] In some embodiments of this application, the control subunit is further configured to:

[0022] After the reactive component is adjusted to the preset range, the current parameter of the controller is restored from the second parameter to the first parameter.

[0023] Thirdly, this application also provides a charging pile, including the charging power unit as provided in the second aspect.

[0024] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to perform the steps in the control method of the charging power unit of any of the first aspects.

[0025] The present application provides a control method for a charging power unit, a charging power unit, a charging pile, and a medium. The control method for the charging power unit, when the reactive component of the input voltage of the charging power unit exceeds a preset range, switches the current parameter of the controller from a first parameter to a second parameter to adjust the reactive component back to the preset range. That is, by comparing the reactive component with the preset range, it quickly and accurately determines whether a frequency jump has occurred. After detecting a frequency jump, the current parameter of the controller is switched from the first parameter to the second parameter, causing the reactive component to return to the preset range. This achieves rapid tracking of the grid frequency, effectively suppressing problems such as bus voltage overcharging and instantaneous current spikes caused by frequency mutations, and improving the stability of the charging power unit under complex grid conditions. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is one of the flowcharts illustrating the control method of the charging power unit provided in some embodiments of this application;

[0028] Figure 2 These are schematic diagrams of the phase-locked loop structure provided in some embodiments of this application;

[0029] Figure 3 This is a second schematic flowchart of the control method for the charging power unit provided in some embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the structure of a charging power unit provided in some embodiments of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0034] The use of "applies to" or "configured to" in this application implies open and inclusive language, which does not preclude applicability to or configuration to devices performing additional tasks or steps. Furthermore, the use of "based on" implies openness and inclusivity, because processes, steps, calculations, or other actions "based on" one or more conditions or values ​​may in practice be based on additional conditions or values ​​beyond those conditions.

[0035] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0036] Currently, in response to frequency fluctuations, charging piles still generate current commands and perform phase-locking control according to the previously set frequency. These control commands based on incorrect frequencies directly lead to bus voltage regulation instability, generating peak currents and ultimately triggering overvoltage or overcurrent protection shutdowns. Simultaneously, due to the severe mismatch between control commands and grid conditions, large instantaneous peak currents are generated. These current surges may damage power devices and reduce system reliability. Therefore, a control method that can promptly follow changes in grid frequency is urgently needed.

[0037] In view of this, embodiments of this application provide a control method for a charging power unit, a charging power unit, a charging pile, and a medium. The control method for the charging power unit, when the reactive component of the input voltage of the charging power unit exceeds a preset range, switches the current parameter of the controller from a first parameter to a second parameter to adjust the reactive component back to the preset range. That is, by comparing the reactive component with the preset range, it quickly and accurately determines whether a frequency jump has occurred. After detecting a frequency jump, the current parameter of the controller is switched from the first parameter to the second parameter, causing the reactive component to return to the preset range, achieving rapid tracking of the grid frequency. This effectively suppresses problems such as bus voltage overcharging and instantaneous current spikes caused by frequency mutations, improves the stability of the charging power unit under complex grid conditions, and thus solves at least some of the aforementioned technical problems.

[0038] On one hand, embodiments of this application provide a control method for a charging power unit, wherein the charging power unit includes a phase-locked loop (PLL), and the PLL includes a controller, such as... Figure 1 As shown, the control method for this charging power unit includes the following steps:

[0039] S101, obtain the reactive component of the input voltage of the charging power unit.

[0040] The reactive component of the input voltage refers to the component of the grid input voltage of the charging power unit in the Q-axis direction under the DQ-axis rotating coordinate system, where the D-axis is the direct axis and the Q-axis is the quadrature axis. In some examples, the three-phase grid input voltages Ua, Ub, and Uc, sampled by a digital signal processor (DSP), are processed by a digital signal processor (DSP) and then processed by a digital signal processor (DSP) as follows: Figure 2 The phase-locked loop shown acquires the Q-axis component of the three-phase voltage. (i.e., reactive power components). Specifically, the three-phase voltages Ua, Ub, and Uc undergo an abc / αβ transformation, converting the voltage signals in the three-phase stationary coordinate system into voltage signals Uα and Uβ in the two-phase stationary coordinate system (αβ coordinate system). The voltage signals Uα and Uβ are then fed into the positive-sequence αβ / dq+ transformation module and the negative-sequence αβ / dq- transformation module, respectively, to obtain the voltage signals in the dq+ coordinate system. and in dq coordinate system Here, a rotation angle θ is introduced, which is output by the integrator 1 / s. The input of the integrator comes from the controller, forming a feedback closed loop. In the dq+ and dq- coordinate systems, respectively... and After decoupling and eliminating the coupling effects between components in the dq coordinate system, the reactive power components are obtained. In the above reactive power component acquisition process, the voltage sampling interval is T (in microseconds, µs), and the voltage is calculated within each sampling period. Under normal operating conditions with a stable grid frequency, the PLL can accurately lock the phase of the grid voltage. The value should be infinitely close to zero. When the power grid experiences a frequency jump, the PLL cannot complete the phase angle resynchronization in a short time. A deviation occurs between the phase angle of the PLL and the actual phase angle of the grid voltage, resulting in a significant Q-axis component in the three-phase voltage vector after DQ transformation.

[0041] S102, when the reactive component exceeds the preset range, the current parameter of the controller is switched from the first parameter to the second parameter so that the reactive component is adjusted to the preset range.

[0042] Understandably, the preset range is an allowable interval close to 0. The smaller the preset range, the more sensitive the response to frequency abrupt changes, but the correspondingly weaker the anti-interference capability; the larger the preset range, although it can enhance the anti-interference capability, it may lead to missed detection of slight jumps. Schematic, the preset range can be set to 0±0.05, or it can be adjusted according to the actual situation.

[0043] If the reactive power component exceeds a preset range, it indicates a deviation between the phase angle of the phase-locked loop (PLL) output and the phase angle of the grid input voltage. This phase deviation causes a significant reactive power component to appear in the input voltage vector in the synchronous rotating coordinate system, thus confirming a frequency jump in the grid. In the case of a confirmed frequency jump, the controller's current parameter is adjusted from a first parameter to a second parameter to bring the reactive power component of the input voltage closer to zero. The controller parameters include at least one of proportional gain, integral gain, and PLL bandwidth. Adjusting the first parameter to the second parameter means changing the controller parameter from a first value to a second value. Illustratively, if the controller parameter is a proportional gain, increasing the current proportional gain amplifies the phase deviation. The PLL generates a larger correction amount for the amplified phase deviation, allowing the PLL's phase angle to catch up with the input voltage's phase angle more quickly. Alternatively, if the controller parameter is an integral gain, increasing the current integral gain accelerates the clearing of the phase deviation, and the corresponding reactive power component also quickly returns to zero. For example, the controller parameter is the phase-locked loop bandwidth shortening time constant. By increasing the current phase-locked loop bandwidth shortening time constant, the PLL phase angle can quickly approach the input voltage phase angle.

[0044] In some examples, the controller parameters include a proportional gain Kp and an integral gain Ki. The proportional gain Kp controls the PLL's response speed to phase errors, while the integral gain Ki controls the ability to eliminate accumulated phase errors. The first parameter includes Kp1 and Ki1, and the second parameter includes Kp2 and Ki2, where Kp2 > Kp1 and Ki2 > Ki1. These first and second parameters are two sets of pre-stored parameter configurations in the charging power unit's control program, facilitating rapid switching between them. The values ​​of the first and second parameters can be fixed or varied according to actual conditions. The first parameter provides smooth PLL control when the grid is operating stably, while the second parameter accelerates the PLL's tracking speed to the grid frequency when a frequency mutation is detected, quickly eliminating reactive power components. In other examples, the first and second parameters may include only one of the proportional and integral gains.

[0045] The control method for a charging power unit provided in this application involves switching the controller's current parameter from a first parameter to a second parameter when the reactive component of the input voltage of the charging power unit exceeds a preset range. This adjusts the reactive component back to the preset range. Specifically, by comparing the reactive component with the preset range, a frequency jump is quickly and accurately determined. Upon detecting a frequency jump, the controller's current parameter is switched from the first parameter to the second parameter, bringing the reactive component back to the preset range. This achieves rapid tracking of the grid frequency, effectively suppressing problems such as bus voltage overcharging and instantaneous current spikes caused by frequency abrupt changes, and improving the stability of the charging power unit under complex grid conditions.

[0046] In addition, the control method of the charging power unit also includes: if the reactive component of the input voltage of the charging power unit does not exceed the preset range, monitoring the input voltage at the next moment, and comparing the reactive component of the input voltage at the next moment with the preset range. If the reactive component of the input voltage at the next moment exceeds the preset range, then the aforementioned step S102 is executed; otherwise, S101 is continued.

[0047] In some embodiments of this application, after the reactive power component is adjusted to a preset range, the method further includes:

[0048] Restore the controller parameters from the second parameter to the first parameter.

[0049] Understandably, when the reactive power component does not exceed the preset range, the controller operates normally with the first parameters Kp1 and Ki1. If a frequency jump is detected, the controller's current parameter values ​​are switched from Kp1 and Ki1 to Kp2 and Ki2. After adjusting the controller parameters, the new reactive power component is monitored. If the new reactive power component is within the preset range, it indicates that the frequency jump has been eliminated, and the controller's current parameter values ​​can be switched back from Kp2 and Ki2 to Kp1 and Ki1, allowing the phase-locked loop to continue operating normally at a stable grid frequency.

[0050] The control method for the charging power unit provided in this application embodiment can directly restore the current parameter of the controller from the second parameter to the first parameter after the reactive component is adjusted to the preset range. The parameter switching process does not require dynamic calculation of the controller parameters, which improves the response efficiency and allows for faster follow-up of the frequency of the jump.

[0051] In some embodiments of this application, the method further includes:

[0052] If the reactive power component exceeds the preset range, reduce the output power of the charging power unit and cut off the drive waveform output of the charging power unit.

[0053] In other words, besides adjusting the parameters of the phase-locked loop (PLL), the output power of the charging power unit can be reduced to lower the load on the PLL. Understandably, lower power output reduces interference with voltage phase information, allowing the PLL to quickly determine the true phase angle of the input voltage under low load. The reduction in output power can be a fixed percentage of the rated power (e.g., reduced to 5%–20% of the rated power) or dynamically adjusted based on the frequency of the voltage jump. In one example, the output power is directly reduced to 6kW.

[0054] At the same time, the drive waveform output of the charging power unit can be cut off (i.e., the PWM switching signal is temporarily turned off), so that the charging power unit stops outputting current, corrects the misalignment of the current direction and voltage direction, and cuts off the injection of errors.

[0055] In other embodiments of this application, the adjustment of the PLL parameters (only the parameters of the phase-locked loop) or the reduction of the output power and / or the drive waveform output of the charging power unit, can be determined based on the difference between the reactive component and the preset range. Schematic, if the difference between the reactive component and the preset range does not exceed a first value, only the PLL parameters are adjusted; if the difference exceeds the first value but does not exceed a second value, the PLL parameters are adjusted and the output power is reduced; if the difference exceeds the second value, the PLL parameters are adjusted, the output power is reduced, and the PWM switching signal is turned off, wherein the second value is greater than the first value.

[0056] The control method for the charging power unit provided in this application not only adjusts the parameters of the phase-locked loop when a frequency jump occurs, but also reduces the output power of the charging power unit and temporarily shuts down the output of the drive waveform, thereby further improving the response efficiency of frequency tracking.

[0057] In some embodiments of this application, after restoring the controller's current parameter from the second parameter to the first parameter, the method further includes:

[0058] After the first duration, the reduced output power of the charging power unit is restored to its original value, and the drive waveform output of the charging power unit is restored.

[0059] In other words, to provide a buffer period, after the controller's current parameters switch back from the second parameter to the first parameter, the controller operates with the first parameter for a period of time without immediately restoring the output power and drive waveform output. If the reactive component remains within a preset range for the entire first duration, the phase-locked loop (PLL) is determined to be in a truly stable state, effectively avoiding misjudgments caused by a temporary drop in phase-locked loop error. Only after confirming that the PLL is in a truly stable state is the output power and drive waveform output restored. The first duration can include several sampling periods.

[0060] In some embodiments of this application, when the reactive power component exceeds a preset range, switching the controller's current parameter from a first parameter to a second parameter includes:

[0061] After a second duration, the controller's current parameter is switched from the first parameter to the second parameter.

[0062] In other words, to prevent false frequency jumps caused by transient disturbances, sampling jitter, or high-frequency noise, if the reactive power component of the output voltage sampled within the second time period still exceeds the preset range after the initial determination that the reactive power component exceeds the preset range, then a genuine frequency jump is determined to have occurred, and the parameters of the phase-locked loop are adjusted accordingly. If, within the second time period, the sampled reactive power component does not exceed the preset range, then it is determined to be a false alarm, and there is no need to adjust the current parameters of the controller.

[0063] In some embodiments of this application, after restoring the controller's current parameter from the second parameter to the first parameter, the method includes:

[0064] If the output current of the charging power unit oscillates, the initial duration is extended. Current oscillation refers to frequent and significant fluctuations in the output current within a short period. The occurrence of current oscillation indicates that the charging power unit is not fully stable and requires a longer recovery time, thus extending the initial duration.

[0065] If the voltage drop duration of the charging power unit exceeds a certain threshold, the first duration should be shortened. The voltage drop duration refers to the time the output voltage remains below the normal operating voltage. A voltage drop duration exceeding the threshold can cause abnormal voltage drops, insufficient bus support, and battery-side control failures. To avoid these problems, the first duration needs to be shortened.

[0066] The control method for the charging power unit provided in this application extends the first duration when the output current of the charging power unit oscillates; and shortens the first duration when the output voltage drop duration of the charging power unit exceeds the duration threshold, thereby achieving dynamic adjustment of the first duration and avoiding problems caused by excessive current oscillation or voltage drop duration.

[0067] like Figure 3 As shown in the figure, this application embodiment also provides a control method for a charging power unit, the method including the following steps:

[0068] S301 monitors the reactive component of the input voltage in real time.

[0069] S302, determine whether the reactive component exceeds the preset range and is maintained for a second duration. If the reactive component exceeds the preset range and is maintained for a second duration, proceed to step S303; if the reactive component does not exceed the preset range, or although it exceeds the preset range, it is not maintained for a second duration, proceed to step S301 to obtain the reactive component at the next moment.

[0070] S303 adjusts the parameters of the phase-locked loop (PLL) to reduce the output power and shut down the output of the drive waveform. Adjusting the PLL parameters can involve switching the controller's current parameters from the first parameter to the second parameter. Shutting down the output of the drive waveform can mean shutting down the drive signal of the Power Factor Correction (PFC) circuit.

[0071] S304, determine whether the reactive power component has recovered to the preset range. If the reactive power component has recovered to the preset range, proceed to step S305; if the reactive power component has not recovered to the preset range, maintain the adjusted phase-locked loop parameters, the reduced output power, and the PFC closed state. The adjusted phase-locked loop parameters can be the second parameter that the controller maintains during operation.

[0072] S305: Restore the PLL parameters and delay for a first duration, restore the output of the drive waveform, restore the output power, and then enter the termination state. Restoring the PLL parameters can be achieved by restoring the controller's current parameters from the second parameter to the first parameter.

[0073] The control method for the charging power unit provided in this application embodiment quickly identifies frequency jumps by comparing the reactive component with a preset range, and adjusts the parameters of the phase-locked loop after determining the frequency jump, thereby reducing the bus surge voltage and input current spike, and avoiding fault shutdown and hardware damage.

[0074] like Figure 4 As shown, this application embodiment also provides a charging power unit 400, which includes a phase-locked loop 401 and a control subunit 402. The phase-locked loop 401 includes a controller, and the control subunit 402 is configured to acquire the reactive component of the input voltage of the charging power unit, and when the reactive component of the input voltage of the charging power unit exceeds a preset range, switch the current parameter of the controller from a first parameter to a second parameter so that the reactive component is adjusted to the preset range.

[0075] In some embodiments of this application, the control subunit 402 is further configured to:

[0076] Restore the controller's current parameters from the second parameter to the first parameter.

[0077] In some embodiments of this application, the control subunit 402 is specifically configured as follows:

[0078] If the reactive power component exceeds the preset range, the output power of the charging power unit 400 is reduced and the drive waveform output of the charging power unit 400 is cut off.

[0079] In some embodiments of this application, the control subunit 402 includes a first subunit configured to:

[0080] After restoring the controller's current parameters from the second parameter to the first parameter and maintaining this for a first duration, the reduced output power of the charging power unit 400 is restored to its original power value, and the drive waveform output of the charging power unit 400 is restored.

[0081] In some embodiments of this application, the control subunit 402 includes a second subunit, which is specifically configured as follows:

[0082] If the reactive power component exceeds the preset range and continues for a second duration, the controller's current parameter will be switched from the first parameter to the second parameter.

[0083] In some embodiments of this application, the control subunit 402 further includes a third subunit, which is configured to:

[0084] If the output current of the charging power unit 400 oscillates, the first duration is extended;

[0085] If the duration of the voltage drop of the charging power unit 400 exceeds the duration threshold, the first duration is shortened.

[0086] The charging power unit 400 provided in this application, when the reactive component of the input voltage of the charging power unit exceeds a preset range, switches the current parameter of the controller from a first parameter to a second parameter to adjust the reactive component back to the preset range. That is, by comparing the reactive component with the preset range, it quickly and accurately determines whether a frequency jump has occurred. After detecting a frequency jump, the controller's current parameter is switched from the first parameter to the second parameter, causing the reactive component to return to the preset range. This achieves rapid tracking of the grid frequency, effectively suppressing problems such as bus voltage overcharging and instantaneous current spikes caused by frequency mutations, and improving the stability of the charging power unit under complex grid conditions.

[0087] Accordingly, this application also provides a charging pile, which includes the charging power unit provided in the above embodiments.

[0088] Accordingly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the control method for the charging power unit of this application embodiment.

[0089] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0090] The control method, charging power unit, charging pile, and medium of the charging power unit provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A control method for a charging power unit, the charging power unit comprising a phase-locked loop (PLL), the PLL comprising a controller, characterized in that, The method includes: Obtain the reactive component of the input voltage of the charging power unit; If the reactive power component exceeds the preset range, the current parameter of the controller is switched from the first parameter to the second parameter so that the reactive power component is adjusted to the preset range.

2. The control method for the charging power unit according to claim 1, characterized in that, After the reactive power component is adjusted to a preset range, the method further includes: Restore the current parameters of the controller from the second parameter to the first parameter.

3. The control method for the charging power unit according to claim 1 or 2, characterized in that, The method further includes: If the reactive power component exceeds a preset range, the output power of the charging power unit is reduced and the drive waveform output of the charging power unit is cut off.

4. The control method for the charging power unit according to claim 2, characterized in that, After restoring the current parameter of the controller from the second parameter to the first parameter, the method further includes: After a first duration, the reduced output power of the charging power unit is restored to its original value, and the drive waveform output of the charging power unit is restored.

5. The control method for the charging power unit according to claim 4, characterized in that, After switching the controller's current parameter from the first parameter to the second parameter, the method includes: If the output current of the charging power unit oscillates, the first duration is extended; If the duration of the voltage drop of the output voltage of the charging power unit exceeds a duration threshold, the first duration is shortened.

6. The control method for the charging power unit according to any one of claims 1 to 5, characterized in that, When the reactive power component exceeds a preset range, switching the controller's current parameter from the first parameter to the second parameter includes: After the reactive component exceeds the preset range and continues for a second duration, the current parameter of the controller is switched from the first parameter to the second parameter.

7. A charging power unit, characterized in that, The charging power unit includes: A phase-locked loop, the phase-locked loop including a controller; The control subunit is configured to acquire the reactive component of the input voltage of the charging power unit, and when the reactive component of the input voltage of the charging power unit exceeds a preset range, switch the current parameter of the controller from a first parameter to a second parameter so that the reactive component is adjusted to the preset range.

8. The charging power unit according to claim 7, characterized in that, The control subunit is also configured to: After the reactive component is adjusted to the preset range, the current parameter of the controller is restored from the second parameter to the first parameter.

9. A charging pile, characterized in that, Includes the charging power unit as described in claim 7 or 8.

10. A computer-readable storage medium, characterized in that, It stores a computer program, which is loaded by a processor to execute the steps in the control method of the charging power unit according to any one of claims 1 to 6.

Images