Overvoltage tuning method and system based on parallel cooperation of resistor and arc suppression coil

Abstract

The invention provides an overvoltage tuning method and system based on parallel cooperation of a resistor and an arc suppression coil. The method comprises the following steps: judging an event type according to a neutral point voltage; when the event type is that the operation mode is changed, performing first tuning based on a first preset rule, and judging whether the neutral point voltage after the first tuning is greater than a threshold value or not; if the neutral point voltage after the first tuning is greater than the threshold value, performing secondary tuning based on a second preset rule, and judging whether the neutral point voltage after the secondary tuning is less than the threshold value; if the voltage of the neutral point after secondary tuning is larger than or equal to the threshold value, a second preset rule continues to be executed until the voltage of the neutral point after secondary tuning is smaller than the threshold value, and if the voltage of the neutral point after secondary tuning is smaller than the threshold value, it is judged that damping succeeds, and the resistance grounding device is reset. According to the invention, a unified zero-sequence impedance regulation and control strategy is established through cooperation of arc suppression coil operation and damping, so that the probability of occurrence of tuning overvoltage is reduced.

Description

Technical Field

[0001] This invention relates to the field of overvoltage tuning technology, and in particular to an overvoltage tuning method and system based on the parallel synergy of a resistor and an arc suppression coil. Background Technology

[0002] In a 35kV ungrounded distribution network, the neutral point is not directly grounded, and its potential is determined by the system's equivalent capacitance to ground. When a single-phase ground fault occurs, the voltage between the two non-faulty phases to ground can rise to near the line voltage, the zero-sequence voltage rises significantly, and the fault current is mainly composed of the capacitance current to ground. As direct-distribution new energy power plants are connected to the grid via collector buses, arc suppression coils are often configured on multiple collector buses to compensate for the capacitance current, gradually forming a distributed compensation pattern across sites and feeders. Under this pattern, the equivalent capacitance to ground fluctuates uncertainly with changes in operating mode (connection and deactivation of collector and distribution lines, parallel connection mode, and segmented state switching). The automatic tuning of the coils at each station interacts with each other, making it difficult for a single station to accurately grasp the zero-sequence parameters of the entire network. As a result, random resonance points that drift with time are prone to appear in the fundamental and low-order harmonic frequency bands, inducing tuning overvoltages and threatening the insulation of neutral point devices and primary equipment. Meanwhile, the switching harmonics of the inverter / converter on the new energy side are coupled with the control loop and amplified through the zero-sequence channel. This, combined with the concentrated capacitance of the cable and the ferromagnetic nonlinearity of the coil, may form random harmonic overvoltages. If the damping of the zero-sequence circuit is insufficient, the peak value and duration of the overvoltage may exceed the thermal stability and insulation margin of the equipment.

[0003] Traditional approaches focus on single-station closed-loop or empirical limit constraints, which can easily lead to tracking mismatches under distributed conditions, where each station adjusts its own circuit and they pull each other along. In engineering, there is an urgent need for a collaborative mechanism for ungrounded systems that is compatible with direct-connection distributed compensation for new energy sources. Without changing the configuration of the collector bus coil, a neutral point resistor should be introduced at the substation side to provide zero-sequence damping and maintain the observation sensitivity of the neutral point displacement voltage. By coordinating the operation of the arc suppression coil with the damping, a unified zero-sequence impedance control strategy should be established to reduce the probability of tuning overvoltage. Summary of the Invention

[0004] The purpose of this invention is to provide an overvoltage tuning method and system based on the parallel coordination of resistors and arc suppression coils, aiming to solve the problems of separate tuning at each station and mutual traction in traditional overvoltage tuning methods.

[0005] In a first aspect, the present invention provides an overvoltage tuning method based on the parallel synergy of a resistor and an arc-suppression coil, the method comprising:

[0006] A resistor grounding device is installed at the neutral point of the distribution network. During normal operation of the resistor grounding device, the neutral point voltage of the power grid is collected, and the event type is determined based on the neutral point voltage. The event type includes changes in operating mode and grounding fault.

[0007] When the event type is a change in the operating mode, the first tuning is performed based on the first preset rule, and it is determined whether the neutral point voltage after the first tuning is greater than the threshold V2.

[0008] If the neutral point voltage after the first tuning is greater than the threshold V2, then a second tuning is performed based on the second preset rule, and it is determined whether the neutral point voltage after the second tuning is less than the threshold V2.

[0009] If the neutral point voltage after secondary tuning is greater than or equal to the threshold V2, the second preset rule continues to be executed until the neutral point voltage after secondary tuning is less than the threshold V2. If the neutral point voltage after secondary tuning is less than the threshold V2, the damping is determined to be successful, and the resistor grounding device is reset.

[0010] In some embodiments, the resistor grounding device includes a resistor branch switch QF. R Series resistor R1, series resistor R2, R1 short-circuit switch QF R1 Current transformer (CT) for the resistance branch, voltage transformer (TV) for the neutral point. N And computer controller M.

[0011] In some embodiments, the step of determining the event type based on the neutral point voltage includes:

[0012] QF of the resistor grounding device R Closing, QF R1 When disconnected, the power grid operates in a medium-resistance grounding mode with resistors R1 and R2 connected in series, which dampens overvoltages within the power grid.

[0013] Through the neutral point voltage transformer TV N Collect the neutral point voltage U of the power grid n0 FZ , when V2>U n0 FZ >V1, if no DC mode component EWMF is detected, the event type is determined to be a change in operating mode, and V1 is the threshold.

[0014] WhenU n0 FZ If the value is greater than V2, or if the DC mode component EWMF is detected, the event type is determined to be a ground fault.

[0015] In some embodiments, the first rule is:

[0016] Disconnect resistor branch switch QF R To enable automatic tuning of each arc suppression coil, an upper limit T for tuning time is set. δ To reach T δ That is, the neutral point resistor

[0017] In some embodiments, the second rule is:

[0018] Resistor branch switch QF R Close the circuit breaker, QF R1 When the circuit breaker is closed, switching to low-resistance grounding dampes and suppresses the overvoltage of the arc suppression coil, with a delay of T. δ1 Disconnect QF R Check the neutral point displacement voltage of the power grid.

[0019] In some embodiments, the method further includes:

[0020] When the event type is grounded, disconnect QF. R The arc suppression coil replenishes the capacitor current of the fault circuit until U n0 FZ <V2, and QF R The circuit breaker is closed, and the device returns to normal.

[0021] In some embodiments, the method further includes:

[0022] The image to be detected is input into the final power equipment inspection model to obtain the fault probability corresponding to the image to be detected.

[0023] Determine whether the failure probability is greater than a second preset threshold;

[0024] If the failure probability is greater than the second preset threshold, it is determined that there is an abnormality in the power equipment;

[0025] If the failure probability is less than or equal to the second preset threshold, the power equipment is determined to be normal.

[0026] Secondly, the present invention provides an overvoltage tuning system based on the parallel coordination of a resistor and an arc-suppression coil, the system comprising:

[0027] The event type discrimination module is used to install a resistor grounding device at the neutral point of the distribution network. During the normal operation of the resistor grounding device, the neutral point voltage of the power grid is collected, and the event type is determined based on the neutral point voltage. The event type includes changes in operating mode and grounding fault.

[0028] The initial tuning module is used to perform initial tuning based on a first preset rule when the event type is a change in the operating mode, and to determine whether the neutral point voltage after the initial tuning is greater than the threshold V2.

[0029] The secondary tuning module is used to perform secondary tuning based on the second preset rule if the neutral point voltage after the first tuning is greater than the threshold V2, and to determine whether the neutral point voltage after the secondary tuning is less than the threshold V2.

[0030] The device reset module is used to continue executing the second preset rule if the neutral point voltage after secondary tuning is greater than or equal to the threshold V2, until the neutral point voltage after secondary tuning is less than the threshold V2. If the neutral point voltage after secondary tuning is less than the threshold V2, the damping is determined to be successful, and the resistor grounding device is reset.

[0031] Thirdly, the present invention provides a storage medium that stores one or more programs, which, when executed by a processor, implement the above-described overvoltage tuning method based on the parallel coordination of a resistor and an arc suppression coil.

[0032] Fourthly, the present invention provides an electronic device, the electronic device comprising a memory and a processor, wherein:

[0033] The memory is used to store computer programs;

[0034] When the processor executes the computer program stored in the memory, it implements the above-mentioned overvoltage tuning method based on the parallel coordination of resistor and arc suppression coil.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. This invention provides basic damping by using medium-resistance grounding during normal operation, and combines the amplitude increment of the neutral point voltage with the DC mode for joint discrimination. This enables rapid and reliable differentiation between changes in operating mode and grounding faults, reducing misjudgments and malfunctions. At the same time, it does not interfere with the automatic tuning and sensing of the arc suppression coils of each station, thus providing an accurate basis for subsequent control actions.

[0037] 2. This invention releases the resistor branch to allow coil tuning when the operating mode changes, and sets a clear maximum tuning time and voltage action threshold. Once the voltage rises above the preset value, it immediately switches to low-resistance grounding to implement strong damping for tuning overvoltage. This can effectively reduce the peak value of overvoltage, shorten the duration, and limit the speed of rise, avoid the resonance risk caused by tuning disorder, reduce various overvoltage risks to primary equipment and neutral point devices (medium-resistance damped lightning overvoltage, random harmonic overvoltage, low-resistance damped tuning overvoltage), and improve the safety margin under multi-station distributed compensation conditions.

[0038] 3. This invention restores the grounding system to medium resistance grounding by performing a review after the damping retention period and following the sequence of "arc suppression first, then restoration". In fault scenarios, the arc suppression coil is used first to compensate for the capacitor current, and the system returns to normal operation after the fault is restored. This closed-loop strategy makes the control logic clear, reduces unnecessary damping intervention and repetitive actions, and improves the stability of the grounding equipment. Attached Figure Description

[0039] Figure 1This is a flowchart of an overvoltage tuning method based on the parallel synergy of a resistor and an arc suppression coil, as proposed in an embodiment of the present invention.

[0040] Figure 2 This is an overall framework diagram of an overvoltage tuning method based on parallel coordination of a resistor and an arc suppression coil proposed in an embodiment of the present invention.

[0041] Figure 3 This is a schematic diagram of the structure of the resistor grounding device as an example of the present invention;

[0042] Figure 4 This is a schematic diagram of an overvoltage tuning system based on the parallel coordination of a resistor and an arc suppression coil, as proposed in an embodiment of the present invention.

[0043] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects.

[0045] The applicant discovered that in a distributed compensation scenario facing a 35kV ungrounded distribution network and with arc suppression coils deployed on the direct-distribution new energy collector bus, there is a potential tuning overvoltage problem when the arc suppression coils on the direct-distribution new energy collector bus are automatically tuned. This problem requires damping the internal overvoltage under normal operation, reliably distinguishing between two types of events: changes in operating mode and grounding faults, and rapidly and controllably suppressing voltage surges during the tuning process.

[0046] Based on this, such as Figures 1 to 3 As shown, one embodiment of the present invention proposes an overvoltage tuning method based on the parallel coordination of a resistor and an arc suppression coil. This method includes steps S101 to S104, wherein:

[0047] Step S101: Install a resistor grounding device at the neutral point of the distribution network. During normal operation of the resistor grounding device, collect the neutral point voltage of the power grid and determine the event type based on the neutral point voltage. The event type includes changes in operating mode and grounding fault.

[0048] It should be noted that the resistor grounding device constructed in this invention includes a resistor branch switch QF. R Series resistor R1, series resistor R2, R1 short-circuit switch QF R1 Current transformer (CT) for the resistance branch, voltage transformer (TV) for the neutral point. N Arc suppression coils are installed on the current collection busbars of direct-connected new energy power plants, along with the computer controller M. During normal operation, the QF resistor grounding device... R Closing, QF R1 When disconnected, the power grid operates in a medium-resistance grounding mode with resistors R2 and R1 connected in series. This dampes overvoltages within the grid without affecting the automatic tuning and sensing of the arc suppression coils at each station. R2, as a low-resistance resistor, is selected based on its ability to reliably dampen overvoltages and is determined through full-scale experiments. The medium-resistance value of R1 and R2, after being connected in series, is selected to sense the compensation effect of the arc suppression coils on changes in grid operation mode; this value is also obtained through full-scale experiments and verified before commissioning. Controller M uses TV... N For measuring the displacement voltage U of the neutral point of the unit n0 Perform continuous sampling and calculate its amplitude criterion U. n0 FZ and to U n0 Empirical wavelet transform (EWT) is implemented to extract the DC mode component EWMF (f = 0Hz) as an indication feature of grounding faults. To ensure the stability of online discrimination, the amplitude and DC mode channels are configured with noise reduction and jitter reduction, and the sampling period and analysis window are consistent with the configuration of the station monitoring system.

[0049] Furthermore, in some embodiments, during the process of determining the event type, the QF of the resistor grounding device is first... R Closing, QF RI When disconnected, the power grid operates in a medium-resistance grounding mode with resistors R1 and R2 connected in series, damping overvoltages within the grid. Then, through the neutral point voltage transformer TV... N Collect the neutral point voltage U of the power grid n0 FZ , when V2>U n0 FZ If V1 > 0 and no DC mode component EWMF is detected, the event type is determined to be a change in operating mode, and V1 is the threshold; when U n0 FZ If the value is greater than V2, or if the DC mode component EWMF is detected, the event type is determined to be a ground fault.

[0050] Step S102: When the event type is a change in the operating mode, perform the first tuning based on the first preset rule, and determine whether the neutral point voltage after the first tuning is greater than the threshold V2.

[0051] Step S103: If the neutral point voltage after the first tuning is greater than the threshold V2, then perform a second tuning based on the second preset rule, and determine whether the neutral point voltage after the second tuning is less than the threshold V2.

[0052] Step S104: If the neutral point voltage after secondary tuning is greater than or equal to the threshold V2, then continue to execute the second preset rule until the neutral point voltage after secondary tuning is less than the threshold V2. If the neutral point voltage after secondary tuning is less than the threshold V2, then the damping is determined to be successful, and the resistor grounding device is reset.

[0053] It should be noted that when the operating mode changes, the controller immediately issues a trip command to QF. R Disconnect and exit the resistor branch to avoid affecting the automatic tuning of the arc suppression coils at each station; simultaneously, start the longest tuning time T. δ Time and continuously monitor U n0 FZ When U is detected during tuning... n0 FZ When the voltage exceeds the preset operating threshold V2, the controller simultaneously closes QF. R With QF R1 This switches the grounding method from medium resistance to low resistance, strongly damping the tuning overshoot voltage and maintaining T. δ1 ;T δ1 Upon expiration, the controller disconnects QF. R Perform a verification measurement; if U at this time n0 FZ If the action threshold is lowered, damping suppression is considered successful, and QF is immediately disconnected. R1 And close QF again R Restore the system to grounded state with the medium resistance of R1 and R2 connected in series, thus ending this operation mode change handling process; if in T δ U did not appear before the timer expired n0 FZ If the action threshold is exceeded, then in T δ Close QF at that time R Restore the intermediate resistance to ground to complete the handling process.

[0054] Specifically, the first rule is:

[0055] Disconnect resistor branch switch QF R To enable automatic tuning of each arc suppression coil, an upper limit T for tuning time is set. δ To reach T δ That is, the neutral point resistance.

[0056] The second rule is:

[0057] Resistor branch switch QF RClose the circuit breaker, QF R1 When the circuit breaker is closed, switching to low-resistance grounding dampes and suppresses the overvoltage of the arc suppression coil, with a delay of T. δ1 Disconnect QF R Check the neutral point displacement voltage of the power grid.

[0058] Furthermore, in some embodiments, upon entering the ground fault mode, the controller trips QF. R The resistor branch is disconnected, and the arc suppression coils at each station compensate for the capacitive current of the fault circuit to reduce the arc sustaining conditions and induce voltage drop; the controller continuously monitors U. n0 FZ When it drops below V2 and the fault is determined to be recovered, close QF. R This returns the device to its normal operating state with the resistance grounded. The current transformer (TA) is used to record the connection and disconnection current information of the resistor branch, and the controller synchronously records U. n0 FZ V1, V2, k, T δ T δ1 and QF R With QF R1 At the moment of action, a complete operation log and traceable action evidence are formed. Through the coordination of the above-mentioned device configuration, signal acquisition, discrimination method and control timing, the present invention achieves rapid differentiation of changes in operating mode and grounding faults without changing the existing arc suppression coil configuration and control logic. When voltage surges may occur during the tuning process, strong damping is implemented with low-resistance grounding. After verification, it returns to the stable mode of medium-resistance grounding, thereby achieving effective suppression and reliable return to the tuning overvoltage.

[0059] In summary, this invention, by employing medium-resistance grounding to provide basic damping during normal operation and combining the amplitude increment of the neutral point voltage with DC mode joint discrimination, can quickly and reliably distinguish between changes in operating mode and grounding faults, reducing misjudgments and malfunctions. Simultaneously, it does not interfere with the automatic tuning sensing of the arc suppression coils at each station, thus providing an accurate prerequisite for subsequent control actions. Furthermore, by first releasing the resistance branch to allow coil tuning during changes in operating mode and setting a clear maximum tuning time and voltage action threshold, once the voltage rises above a preset value, it immediately switches to low-resistance grounding to implement strong damping for tuning overvoltage, effectively reducing overvoltage peak values. By shortening the duration and limiting the surge speed, the risk of resonance caused by tuning disorder is avoided, reducing various overvoltage risks to primary equipment and neutral point devices (medium-resistance damped lightning overvoltage, random harmonic overvoltage, and low-resistance damped tuning overvoltage), and improving the safety margin under multi-station distributed compensation conditions. In addition, by reviewing after the damping retention period and restoring to medium-resistance grounding in the order of "arc suppression first, then restoration", the arc suppression coil is used to compensate for the capacitive current in fault scenarios, and the system returns to normal operation after fault recovery. This closed-loop strategy makes the control logic clear, reduces unnecessary damping intervention and repetitive actions, and improves the stability of grounding equipment.

[0060] like Figure 4 As shown, this invention proposes an overvoltage tuning system based on the parallel coordination of a resistor and an arc-suppression coil. The system includes:

[0061] Event type discrimination module 10 is used to install a resistor grounding device at the neutral point of the distribution network. During the normal operation of the resistor grounding device, the neutral point voltage of the power grid is collected, and the event type is determined according to the neutral point voltage. The event type includes changes in operating mode and grounding fault.

[0062] The initial tuning module 20 is used to perform initial tuning based on a first preset rule when the event type is a change in the operating mode, and to determine whether the neutral point voltage after the initial tuning is greater than the threshold V2.

[0063] The secondary tuning module 30 is used to perform secondary tuning based on the second preset rule if the neutral point voltage after the first tuning is greater than the threshold V2, and to determine whether the neutral point voltage after the secondary tuning is less than the threshold V2.

[0064] The device reset module 40 is used to continue executing the second preset rule if the neutral point voltage after secondary tuning is greater than or equal to the threshold V2, until the neutral point voltage after secondary tuning is less than the threshold V2. If the neutral point voltage after secondary tuning is less than the threshold V2, the damping is determined to be successful and the resistor grounding device is reset.

[0065] In another aspect, the present invention also proposes a storage medium on which one or more programs are stored, which, when executed by a processor, implement the above-described overvoltage tuning method based on the parallel coordination of a resistor and an arc suppression coil.

[0066] In another aspect, the present invention also proposes an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to realize the above-mentioned overvoltage tuning method based on the parallel coordination of a resistor and an arc suppression coil.

[0067] Those skilled in the art will understand that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can mean any means that can contain stored, communicated, propagated, or transmitted programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0068] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0069] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0070] While embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of the invention as set forth in the claims. Furthermore, the invention described herein may have other embodiments and can be implemented or carried out in various ways.

Claims

1. A method for overvoltage tuning based on parallel coordination of resistance and arc suppression coil, characterized in that, The method comprises: installing a resistance grounding device at a neutral point of a power distribution network, collecting a neutral point voltage of the power distribution network during normal operation of the resistance grounding device, and determining an event type according to the neutral point voltage, the event type including a change in operation mode and a grounding fault; when the event type is a change in operation mode, performing first tuning based on a first preset rule, and determining whether the neutral point voltage after the first tuning is greater than a threshold V2; if the neutral point voltage after the first tuning is greater than the threshold V2, performing second tuning based on a second preset rule, and determining whether the neutral point voltage after the second tuning is less than the threshold V2; if the neutral point voltage after the second tuning is greater than or equal to the threshold V2, continuing to execute the second preset rule until the neutral point voltage after the second tuning is less than the threshold V2, and if the neutral point voltage after the second tuning is less than the threshold V2, determining that damping is successful, and resetting the resistance grounding device.

2. The overvoltage tuning method based on the parallel coordination of the resistance and the arc-extinguishing coil according to claim 1, characterized in that, The resistance grounding device comprises a resistance branch switch QF R , a series resistance R1, a series resistance R2, an R1 short-circuit switch QF R1 , a resistance branch current transformer TA, a neutral point voltage transformer TV N and a computer controller M.

3. The overvoltage tuning method based on the parallel coordination of the resistance and the arc-extinguishing coil according to claim 2, characterized in that, The step of determining the event type according to the neutral point voltage comprises: QF of the resistance grounding device R closing, QF R1 disconnecting, the power grid works in the middle resistance grounding mode of the series connection of the resistances R1 and R2, and overvoltage in the power grid is damped By means of a neutral point voltage transformer TV N The neutral point voltage U of the power grid is acquired n0 FZ When V2 > U n0 FZ V1, no DC mode component EWMF is detected, then the event type is determined as a change in operating mode, V1 being a threshold value. When U n0 FZ V2, or detecting a direct current mode component EWMF, then the event type is determined to be a ground fault.

4. The overvoltage tuning method based on the parallel coordination of the resistance and the arc-extinguishing coil according to claim 3, characterized in that, The first rule is: The resistance branch switch QF is opened R , so that each arc-extinguishing coil is automatically tuned, and the upper limit T of the tuning duration is set δ , and T is reached δ , i.e. the neutral point resistance is combined.

5. The overvoltage tuning method based on the parallel coordination of the resistance and the arc-extinguishing coil according to claim 4, characterized in that, The second rule is: Switching on the resistance branch switch QF R Switching on, switching to low resistance grounding to damp the arc suppression coil tuned overvoltage R1 Switching on, switching to low resistance grounding to damp the arc suppression coil tuned overvoltage, delay T δ1 Switching off QF R Checking the neutral point displacement voltage of the power grid.

6. The overvoltage tuning method based on the parallel coordination of the resistance and the arc-extinguishing coil according to claim 5, characterized in that, The method further comprises: When the event type is ground mode, open QF R , the arc suppression coil supplements the fault loop capacitance current until U n0 FZ <V2, and QF R is closed, and the device returns to normal.

7. An overvoltage tuning system based on the parallel coordination of a resistance and an arc suppression coil, characterized by The system comprises: an event type determination module configured to install a resistance grounding device at a neutral point of a power distribution network, collect a neutral point voltage of the power distribution network during normal operation of the resistance grounding device, and determine an event type according to the neutral point voltage, the event type including a change in operation mode and a grounding fault; a first tuning module configured to, when the event type is a change in operation mode, perform first tuning based on a first preset rule, and determine whether the neutral point voltage after the first tuning is greater than a threshold V2; a second tuning module configured to, if the neutral point voltage after the first tuning is greater than the threshold V2, perform second tuning based on a second preset rule, and determine whether the neutral point voltage after the second tuning is less than the threshold V2; a device resetting module configured to, if the neutral point voltage after the second tuning is greater than or equal to the threshold V2, continue to execute the second preset rule until the neutral point voltage after the second tuning is less than the threshold V2, and if the neutral point voltage after the second tuning is less than the threshold V2, determine that damping is successful, and reset the resistance grounding device.

8. A storage medium, characterized by The storage medium stores one or more programs, which are executed by the processor to implement the overvoltage tuning method based on parallel coordination of a resistance and an arc extinction coil according to any one of claims 1-7. 9.An electronic device, comprising a memory and a processor, wherein: the memory is configured to store a computer program; the processor is configured to execute the computer program stored on the memory to implement the overvoltage tuning method based on parallel coordination of a resistance and an arc extinction coil according to any one of claims 1-7.

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