Single-phase ground fault compensation processing method and related device

Abstract

The application discloses a single-phase grounding fault compensation processing method and related devices, and the method comprises the following steps: tuning the arc suppression coil so that the distance between the arc suppression coil and the resonance point changes from the first distance to the second distance, and the second distance is smaller than the first distance; obtaining the zero sequence electric signal obtained by sampling the zero sequence system when the sampling module is in the second distance between the arc suppression coil and the resonance point; determining the fault point residual voltage and the fault point residual current of the target distribution network circuit according to the zero sequence electric signal; determining the target compensation value of the target distribution network circuit according to the fault point residual voltage and the fault point residual current; and controlling the compensation module to compensate the target distribution network circuit according to the target compensation value. The method disclosed in the application is beneficial to improving the processing effect on the cable single-phase grounding fault.

Description

Technical Field

[0001] This invention relates to the field of circuit analysis and processing technology, and in particular to a single-phase grounding fault compensation method and related apparatus. Background Technology

[0002] In the current construction of urban and rural power grids, the cableization of medium-voltage distribution networks is accelerating, especially in urban areas where full cable coverage has been achieved. While this trend improves power supply reliability, it also significantly increases the risk of single-phase grounding faults in cables. The frequent "cable trench fires" (caused by grounding arcs) in recent years have caused large-scale power outages, seriously threatening power supply safety and social production. Existing neutral grounding methods face fundamental challenges: although arc suppression coils can compensate for ground capacitance current and suppress arc overvoltage, they cannot handle active and harmonic components, thus leading to the need to improve the effectiveness of existing technologies in handling single-phase grounding faults in cables. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a single-phase grounding fault compensation method and related apparatus. Adopting the solution of this application is beneficial for improving the handling effect of single-phase grounding faults in cables.

[0004] Firstly, a single-phase grounding fault compensation method is applied to an active power compensator. The active power compensator includes a sampling module, a compensation module, and a zero-sequence system. The zero-sequence system includes an arc suppression coil and is connected to the neutral point of the target distribution network circuit. The method includes: tuning the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, where the second distance is less than the first distance; acquiring the zero-sequence electrical signal obtained by the sampling module from the zero-sequence system when the distance between the arc suppression coil and the resonant point is the second distance; determining the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal; determining the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point; and controlling the compensation module to compensate the target distribution network circuit based on the target compensation value.

[0005] As can be seen, in this embodiment, by tuning and amplifying the zero-sequence signal near the resonant point, the detection sensitivity of high-impedance faults is significantly improved. It can preferentially detect the active and harmonic components of arc overvoltage that cannot be detected in existing technologies, and then compensate for the active and harmonic components of arc overvoltage. This effectively solves the compensation blind zone of existing technologies and the safety hazards of traditional compensation schemes, and improves the handling effect of single-phase grounding faults in cables.

[0006] In conjunction with the first aspect, in one possible embodiment, the sampling module further includes a gain module. Before determining the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal, the method further includes: determining the pulse width of the zero-sequence electrical signal; determining the signal amplitude of the zero-sequence electrical signal based on the pulse width; determining the amplification factor of the zero-sequence electrical signal based on the signal amplitude, wherein the signal amplitude and the amplification factor are inversely correlated; and controlling the gain module to amplify the zero-sequence electrical signal based on the amplification factor.

[0007] As can be seen from the embodiments of this application, intelligent amplification of zero-sequence electrical signals is achieved through dynamic gain control based on pulse width and signal amplitude. This not only enhances the detection capability of weak fault signals but also avoids signal saturation, improves measurement accuracy and system reliability, provides a basis for the identification and compensation of 15kΩ high-resistance faults, and improves the handling effect of single-phase grounding faults in cables.

[0008] In conjunction with the first aspect, in one possible embodiment, the sampling module further includes a signal follower, and before determining the pulse width of the zero-sequence electrical signal, the method further includes: processing the zero-sequence electrical signal based on the signal follower to increase the input impedance of the zero-sequence electrical signal and decrease the output impedance of the zero-sequence electrical signal.

[0009] As can be seen from the embodiments of this application, the impedance matching processing of the signal follower effectively solves the signal distortion problem caused by impedance mismatch in traditional measurement, and ensures the accuracy of fault signal acquisition.

[0010] In conjunction with the first aspect, in one possible embodiment, determining the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point includes: determining the composite error of the target distribution network circuit based on the residual voltage and residual current at the fault point; obtaining the gain coefficient of the target distribution network circuit; and determining the target compensation value of the target distribution network circuit based on the composite error and the gain coefficient.

[0011] As can be seen, in the embodiments of this application, the residual voltage-residual current joint control strategy comprehensively considers the voltage and current characteristics of the fault point, and dynamically generates the target compensation value by utilizing composite error and adjustable gain coefficient, providing an effective technical means to solve high-resistance grounding faults.

[0012] In conjunction with the first aspect, in one possible embodiment, the active power compensator further includes a triangular wave comparator, which controls the compensation module to compensate the target distribution network circuit according to the target compensation value, including: acquiring the actual compensation value obtained by the sampling module sampling the compensation signal output by the compensation module; determining the compensation deviation of the compensation module according to the target compensation value and the actual compensation value; inputting the compensation deviation into the triangular wave comparator to obtain the adjustment signal output by the triangular wave comparator; and adjusting the compensation signal output by the compensation module according to the adjustment signal.

[0013] As can be seen from the embodiments of this application, by adopting the triangular wave comparison current tracking control strategy, the accurate closed-loop control of the compensation signal is achieved, which improves the system stability and provides a reliable technical guarantee for the full-state compensation of single-phase grounding faults in the distribution network.

[0014] In conjunction with the first aspect, in one possible embodiment, before obtaining the actual compensation value obtained from the compensation signal output by the sampling module and the compensation module, the method further includes: obtaining circuit data of the target distribution network circuit, and pre-synchronizing the compensation module according to the circuit data; after the pre-synchronization of the compensation module is completed, connecting the compensation module to the target distribution network circuit; and adjusting the amplitude and phase of the compensation module according to the circuit data within a preset time.

[0015] As can be seen from the embodiments of this application, the phase-synchronous grid connection control technology achieves rapid and accurate synchronization between the compensation module and the distribution network system. This pre-synchronization mechanism effectively avoids the inrush current and equipment damage caused by phase asynchrony in traditional solutions, ensuring the safe and reliable connection of the active compensator to the system and improving the dynamic response speed and stability of the system.

[0016] In conjunction with the first aspect, in one possible embodiment, the active power compensator further includes a temperature sensing module, and the method further includes: acquiring temperature data collected by the temperature sensing module; acquiring a temperature threshold of the target distribution network circuit; if the temperature data is not less than the temperature threshold and the duration is not less than a first preset time, then performing derating control on the compensation module; if the temperature data is not less than the temperature threshold and the duration is not less than a second preset time, then performing trip protection on the target distribution network circuit.

[0017] As can be seen from the embodiments of this application, intelligent thermal management of the compensation module is realized through real-time monitoring by the temperature sensing module and the equipment hierarchical protection mechanism, which significantly improves the reliability and safety of the active power compensator in long-term operation and solves the overheating risk problem of high-power power electronic equipment in the fault compensation process.

[0018] Secondly, embodiments of this application provide a single-phase grounding fault compensation processing device for performing a single-phase grounding fault compensation processing method. The device includes a sampling module, a compensation module, and a zero-sequence system. The zero-sequence system includes an arc suppression coil and is connected to the neutral point of the target distribution network circuit. The device includes:

[0019] The adjustment unit is used to tune the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, where the second distance is smaller than the first distance.

[0020] The acquisition unit is used to acquire the zero-sequence electrical signal obtained by the sampling module when the distance between the arc suppression coil and the resonant point is the second distance.

[0021] The determination unit is used to determine the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal.

[0022] The determination unit is used to determine the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point.

[0023] The compensation unit is used to control the compensation module to compensate the target distribution network circuit according to the target compensation value.

[0024] Thirdly, embodiments of this application provide an electronic device including a processor, a memory, a communication interface, and one or more programs, the one or more programs being stored in the memory and configured to be executed by the processor, and one or more instructions being adapted to be loaded by the processor and to execute part or all of the methods of the first aspect and / or the second aspect.

[0025] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program for electronic data interchange, wherein the computer program causes a computer to perform part or all of the methods of the first aspect and / or the second aspect.

[0026] Fifthly, this application provides a computer program product that, when read and executed by a computer, causes the computer to perform part or all of the methods of the first aspect and / or the second aspect.

[0027] It is understood that the beneficial effects of the embodiments of the second to fifth aspects can be referred to the beneficial effects of the method of the first aspect, and will not be repeated here. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0029] Figure 1 This is a schematic diagram illustrating an application scenario of a single-phase grounding fault compensation method provided in an embodiment of this application.

[0030] Figure 2A An equivalent circuit diagram of a zero-sequence system provided in this application embodiment;

[0031] Figure 2B A resonance curve of a zero-sequence system provided in an embodiment of this application;

[0032] Figure 3A circuit compensation control schematic diagram of an active power compensator provided in an embodiment of this application;

[0033] Figure 4 A flowchart illustrating a single-phase grounding fault compensation method provided in this application embodiment;

[0034] Figure 5 A schematic diagram of an automatic hierarchical amplifier circuit provided in an embodiment of this application;

[0035] Figure 6 A schematic diagram of an impedance matching circuit provided in an embodiment of this application;

[0036] Figure 7 A flowchart illustrating another single-phase grounding fault compensation method provided in this application embodiment;

[0037] Figure 8 A block diagram of a compensated PID control provided in an embodiment of this application;

[0038] Figure 9 A schematic diagram of a triangular wave comparison control principle provided in an embodiment of this application;

[0039] Figure 10 A flowchart illustrating another single-phase grounding fault compensation method provided in this application embodiment;

[0040] Figure 11 This is a schematic diagram of the structure of a single-phase grounding fault compensation and processing device provided in an embodiment of this application;

[0041] Figure 12 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0042] Reference numerals: Application scenario: 100; Active power compensator: 101; Target distribution network circuit: 102; Operation and maintenance terminal: 103; Control system: 1011; Sampling module: 1012; Compensation module: 1013; Single-phase grounding fault compensation and processing device: 1100; Adjustment unit: 1101; Acquisition unit: 1102; Determination unit: 1103; Compensation unit: 1104; Electronic equipment: 1200; Memory: 1201; Processor: 1202; Communication interface: 1203; Bus: 1204. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0044] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] The embodiments of this application will now be described with reference to the accompanying drawings.

[0047] Example 1: Please refer to Figure 1 , Figure 1 This is a schematic diagram of an application scenario for a single-phase grounding fault compensation method provided in an embodiment of this application. In this application scenario 100, there are an active power compensator 101, a target distribution network circuit 102, and an operation and maintenance terminal 103.

[0048] The active power compensator 101 is used to acquire relevant information about the target distribution network circuit 102, and based on the real-time acquired information, determine whether a single-phase ground fault has occurred in the target distribution network circuit 102. If a single-phase ground fault has occurred in the target distribution network circuit 102, it generates a compensation current to resolve the fault. Furthermore, the active power compensator 101 can also send relevant information about the target distribution network circuit 102 or generate relevant warning messages about the target distribution network circuit 102 to the operation and maintenance terminal 103.

[0049] The active power compensator 101 also includes a control module, which includes one or more control devices such as a central processing unit (CPU) or a microcontroller unit (MCU) to execute subsequent steps.

[0050] The target distribution network circuit 102 is a circuit system that establishes a connection between the load or energy storage device and the power grid to realize bidirectional flow of electrical energy.

[0051] The maintenance terminal 103 is a terminal device for personnel managing and maintaining the active power compensator 101 and the target distribution network circuit 102. It is used to receive information sent by the active power compensator 101 or to remotely control the active power compensator 101, etc.

[0052] In this embodiment, the source power compensator 101 includes a sampling module, a compensation module, and a zero-sequence system. The zero-sequence system includes an arc suppression coil and is connected to the neutral point of the target distribution network circuit 102.

[0053] The active power compensator 101 tunes the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, and the second distance is less than the first distance.

[0054] After a single-phase ground fault occurs, the zero-sequence system starts to operate and compensates based on the current circuit state in the target distribution network circuit 102. At this time, the active power compensator 101 will adjust the inductance value of the arc suppression coil so that its operating point is close to the resonance point (i.e., the inductive reactance of the arc suppression coil in the zero-sequence circuit is close to the ground capacitance), thereby amplifying the zero-sequence electrical signal by utilizing the resonance effect.

[0055] See, for example Figure 2A , Figure 2A An equivalent circuit diagram of a zero-sequence system is provided for an embodiment of this application, wherein E0 is the neutral point of the distribution network, L is the zero-sequence coil, R is the zero-sequence resistor, C is the zero-sequence capacitor, and iL, iR and i are used to indicate the direction of current.

[0056] Please see Figure 2B , Figure 2B This application provides a resonance curve diagram of a zero-sequence system according to an embodiment. Where I0 is the zero-sequence current and V0 is the zero-sequence voltage, based on... Figure 2B It can be seen that in a 10kV zero-sequence system, the typical amplification factor of the zero-sequence electrical signal (in this case, the voltage signal) can reach 10 times (i.e., X). L / r times, where X L (where r is the inductance of the zero-sequence coil and r is the resistance of the zero-sequence resistor), which significantly enhances the ability to detect subtle fault characteristics (such as kHz-level transient disturbances caused by high-resistance grounding).

[0057] The active power compensator 101 acquires the zero-sequence electrical signal obtained by the zero-sequence system when the arc suppression coil and the resonant point are at a second distance.

[0058] The sampling module samples the zero-sequence electrical signal obtained from the zero-sequence system when the distance between the arc suppression coil and the resonant point is a second distance. The zero-sequence electrical signal includes zero-sequence voltage and zero-sequence current.

[0059] The active power compensator 101 determines the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal.

[0060] For example, in the zero-sequence equivalent circuit model, the active power compensator 101 uses the displacement voltage formula and current relationship, combined with the sampled data, to calculate the residual voltage and residual current at the fault point in real time.

[0061] The active power compensator 101 determines the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point.

[0062] The target compensation value includes compensation for active, reactive, and harmonic components to ensure smooth switching of the system under various fault conditions.

[0063] The active power compensator 101 controls the compensation module to compensate the target distribution network circuit according to the target compensation value.

[0064] Specifically, please see Figure 3 , Figure 3 This is a schematic diagram of the circuit compensation control of an active power compensator provided in an embodiment of this application. The active power compensator 101 includes a control system 1011, a sampling module 1012, and a compensation module 1013. It can be seen that the control system 1011 obtains the target compensation value based on the input signal (including zero-sequence electrical signal, etc.) of the sampling module, and then performs modulation output control on the compensation module 1013, thereby controlling the drive part of the compensation module 1013 to drive the inverter part to output the compensation signal. At the same time, the sampling module 1012 also samples the output signal of the drive part and sends it to the control system 1011. The control system 1011 adjusts the output control of the compensation module 1013 based on the output signal.

[0065] As can be seen, in this embodiment, by tuning and amplifying the zero-sequence signal near the resonant point, the detection sensitivity of high-impedance faults is significantly improved. It can preferentially detect the active and harmonic components of arc overvoltage that cannot be detected in existing technologies, and then compensate for the active and harmonic components of arc overvoltage. This effectively solves the compensation blind zone of existing technologies and the safety hazards of traditional compensation schemes, and improves the handling effect of single-phase grounding faults in cables.

[0066] The following will explain the specific steps; please refer to [link / reference]. Figure 4 , Figure 4 This is a flowchart illustrating a single-phase grounding fault compensation method provided in an embodiment of this application, which can be based on... Figure 1 The application scenario 100 shown is implemented as follows: Figure 4 As shown, steps S401-S405 are included:

[0067] S401: The active power compensator tunes the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, where the second distance is less than the first distance.

[0068] The active power compensator tunes the arc suppression coil to bring it closer to the resonant point, thereby amplifying the zero-sequence electrical signal (such as the zero-sequence voltage signal).

[0069] S402: The active power compensator sampling module samples the zero-sequence electrical signal obtained by the zero-sequence system when the distance between the arc suppression coil and the resonant point is the second distance.

[0070] Optionally, the sampling module further includes a gain module. Before determining the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal, the method further includes: determining the pulse width of the zero-sequence electrical signal; determining the signal amplitude of the zero-sequence electrical signal based on the pulse width; determining the amplification factor of the zero-sequence electrical signal based on the signal amplitude, wherein the signal amplitude and the amplification factor are inversely correlated; and controlling the gain module to amplify the zero-sequence electrical signal based on the amplification factor.

[0071] Specifically, in the embodiments of this application, the signal processing procedure when the sampling module includes a gain module is explained.

[0072] Before determining the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal, the pulse width of the zero-sequence electrical signal must first be determined. The pulse width reflects the time-domain characteristics of the signal and can be used to identify the fault type and intensity. For example, when a single-phase ground fault occurs, the zero-sequence electrical signal may exhibit a pulse waveform with a specific pulse width (such as a short pulse generated by a momentary arc grounding or a long pulse generated by a high-resistance grounding). By detecting the pulse width in real time, the transient characteristics of the fault can be preliminarily judged.

[0073] Secondly, the signal amplitude of the zero-sequence electrical signal is determined based on the pulse width. There is a statistical correlation or empirical mapping relationship between pulse width and signal amplitude; for example, a wider pulse usually corresponds to higher signal energy or amplitude, while a narrower pulse may represent a transient disturbance with a lower amplitude. Using a predetermined lookup table or calculation formula, an estimated value of the signal amplitude can be derived from the pulse width, providing input parameters for subsequent gain adjustment.

[0074] Then, the amplification factor of the zero-sequence electrical signal is determined based on the signal amplitude, where the signal amplitude and amplification factor are inversely correlated. When the signal amplitude is small (such as a weak fault signal, for example, a kHz-level disturbance caused by a 15kΩ high-impedance grounding), a high amplification factor (e.g., 60dB) is used to enhance signal sensing sensitivity; when the signal amplitude is large (such as a low-impedance grounding or arcing grounding), a low amplification factor (e.g., 20dB) is used to prevent ADC saturation or distortion. This inverse correlation ensures optimized signal processing within the ADC range, resolving the range conflict of traditional ADCs.

[0075] Finally, the zero-sequence electrical signal is amplified by a gain module based on the amplification factor. The gain module may include a programmable amplifier or an automatic gain control circuit, which dynamically adjusts the gain parameters according to a determined amplification factor, thereby precisely amplifying the zero-sequence electrical signal. For example, real-time gain switching can be achieved through digital potentiometers or FPGA control, ensuring the signal remains at an appropriate level during subsequent processing, facilitating accurate extraction of fault characteristics.

[0076] For example, please see Figure 5 , Figure 5 This is a schematic diagram of an automatic hierarchical amplification circuit provided in an embodiment of this application. The sampling module specifically uses... Figure 5 The automatic graded amplifier circuit shown identifies the pulse width of a zero-sequence electrical signal. The circuit includes a pulse width detection circuit, a counter, an analog switch, and an adder circuit. The pulse width detection circuit comprises a diode RB, a first operational amplifier OPA1, a first resistor R1, and a second resistor R2. The adder circuit comprises a first adder resistor Ro1, a second adder resistor Ro2, a third adder resistor Ro3, a fourth adder resistor Ro4, and a second operational amplifier OPA2. Different combinations of adder resistors and the second operational amplifier OPA2 achieve different amplification rates. The connection relationships of the components are shown in the figure. Vi and Vo represent the input and output points of the signal.

[0077] The pulse width detection circuit is used to detect the pulse width of the zero-sequence electrical signal, the counter is used to determine the signal amplitude of the zero-sequence electrical signal, and the analog switch and adder circuit are used to realize real-time gain switching and achieve precise amplification based on the current gain.

[0078] As can be seen from the embodiments of this application, intelligent amplification of zero-sequence electrical signals is achieved through dynamic gain control based on pulse width and signal amplitude. This not only enhances the detection capability of weak fault signals but also avoids signal saturation, improves measurement accuracy and system reliability, provides a basis for the identification and compensation of 15kΩ high-resistance faults, and improves the handling effect of single-phase grounding faults in cables.

[0079] Optionally, the sampling module further includes a signal follower. Before determining the pulse width of the zero-sequence electrical signal, the method further includes: processing the zero-sequence electrical signal based on the signal follower to increase the input impedance of the zero-sequence electrical signal and decrease the output impedance of the zero-sequence electrical signal.

[0080] Specifically, in the embodiments of this application, the signal preprocessing process when the sampling module includes a signal follower is explained. Before determining the pulse width of the zero-sequence electrical signal, the active power compensator processes the zero-sequence electrical signal based on the signal follower to increase the input impedance of the zero-sequence electrical signal and decrease the output impedance of the zero-sequence electrical signal.

[0081] For example, please see Figure 6 , Figure 6 This application provides a schematic diagram of an impedance matching circuit, including a first capacitor C1, a second capacitor C2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a third operational amplifier OPA3, with the connections shown in the figure. Vi and Vo represent the input and output points of the signal. The signal follower uses a bootstrap signal follower circuit to achieve high input impedance (>10MΩ) and low output impedance (<1Ω).

[0082] In practical applications, when a zero-sequence electrical signal enters the sampling module, it is first processed by a signal follower. High input impedance ensures that almost no load effect is generated when acquiring signals from the zero-sequence distribution network system, avoiding attenuation or distortion of the original signal; low output impedance enhances the signal driving capability and can effectively isolate the load effect of subsequent circuits (such as gain modules and ADC sampling circuits), ensuring the stability and accuracy of signal transmission.

[0083] As can be seen from the embodiments of this application, the impedance matching processing of the signal follower effectively solves the signal distortion problem caused by impedance mismatch in traditional measurement, and ensures the accuracy of fault signal acquisition.

[0084] S403: The active power compensator determines the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal.

[0085] The active power compensator specifically calculates the residual voltage and residual current at the fault point in real time by combining the displacement voltage formula and current relationship with the sampled data.

[0086] S404: The active power compensator determines the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point.

[0087] The target compensation value here includes one or more of the compensation amounts for active power, reactive power, and harmonic components, ensuring that the system switches smoothly under various fault conditions.

[0088] S405: The active power compensator controls the compensation module to compensate the target distribution network circuit according to the target compensation value.

[0089] The active power compensator generates a corresponding control signal based on the target compensation value, so that the compensation module inputs the corresponding compensation signal to the target distribution network circuit to achieve compensation for the target distribution network circuit.

[0090] Example 2: The above-described application embodiments mainly describe a single-phase ground fault compensation method. Based on the embodiments of this application, a more detailed compensation method focusing on determining the compensation value is also provided. Please refer to... Figure 7 , Figure 7 This is a flowchart illustrating another single-phase ground fault compensation method provided in an embodiment of this application, which can be based on... Figure 1 The application scenario 100 shown is implemented, including steps S701-S707:

[0091] S701: The active power compensator tunes the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, where the second distance is less than the first distance.

[0092] S702: The active power compensator sampling module samples the zero-sequence electrical signal obtained by the zero-sequence system when the distance between the arc suppression coil and the resonant point is the second distance.

[0093] S703: The active power compensator determines the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal.

[0094] S704: The active power compensator determines the composite error of the target distribution network circuit based on the residual voltage and residual current at the fault point.

[0095] Specifically, it is a comprehensive index characterizing the deviation of the system from the ideal compensation state. Its calculation takes into account the amplitude and phase differences of the residual pressure and residual current, reflecting whether the system is currently in an over-compensated, under-compensated, or fully compensated state, and providing input for the accurate calculation of subsequent compensation amounts.

[0096] S705: Active power compensator obtains the gain coefficient of the target distribution network circuit.

[0097] Specifically, the gain factor includes the scaling factor. K p Integral coefficient K i and differential coefficients K d These coefficients constitute the core parameters of the controller.

[0098] Furthermore, these coefficients can be dynamically adjusted according to the system's operating state to adapt to different compensation requirements. For example, when overcompensation causes transient voltage oscillations, the differential coefficient can be appropriately increased. K d To enhance damping; when undercompensation leads to sluggish response, increase the proportional gain. K p To speed up the response.

[0099] S706: The active power compensator determines the target compensation value of the target distribution network circuit based on the composite error and gain coefficient.

[0100] Specifically, the target compensation value of the target distribution network circuit satisfies the following formula (1):

[0101] (1)

[0102] Where u(t) is the target compensation value, K p For proportionality coefficient, K i For integral coefficients, K d These are the differential coefficients. Further, please refer to... Figure 8 , Figure 8 This application provides a block diagram of a compensated PID control, where APC is the compensation module, and the proportional-integral-derivative (PID) elements correspond to the proportional coefficient, integral coefficient, and derivative coefficient, respectively. It can be seen that the gain coefficient can be dynamically adjusted based on the actual compensated output value and related data using electrical measuring equipment.

[0103] As can be seen, in the embodiments of this application, the residual voltage-residual current joint control strategy comprehensively considers the voltage and current characteristics of the fault point, and dynamically generates the target compensation value by utilizing composite error and adjustable gain coefficient, providing an effective technical means to solve high-resistance grounding faults.

[0104] S707: The active power compensator controls the compensation module to compensate the target distribution network circuit according to the target compensation value.

[0105] For detailed explanations of steps S701-S703 and S707, please refer to the explanations and related content of steps S401-S405, which will not be repeated here.

[0106] Optionally, the active power compensator further includes a triangular wave comparator, which controls the compensation module to compensate the target distribution network circuit according to the target compensation value, including: obtaining the actual compensation value sampled by the sampling module from the compensation signal output by the compensation module; determining the compensation deviation of the compensation module according to the target compensation value and the actual compensation value; inputting the compensation deviation into the triangular wave comparator to obtain the adjustment signal output by the triangular wave comparator; and adjusting the compensation signal output by the compensation module according to the adjustment signal.

[0107] Specifically, in the embodiment of the present application, the active power compensator further includes a triangular wave comparator.

[0108] First, the active power compensator controls the compensation module to output a compensation signal based on the target compensation value. At this time, the active power compensator obtains the actual compensation value sampled by the sampling module from the compensation signal output by the compensation module. The actual compensation value reflects the characteristic parameters of the compensation signal currently actually output by the compensation module, including the amplitude, phase, etc. of the compensation current. The sampling module collects the electrical signal at the output end of the compensation module in real time through a high-precision sensor and transmits it to the control system after ADC conversion.

[0109] Next, the compensation deviation of the compensation module is determined according to the target compensation value and the actual compensation value. This deviation value reflects the difference between the current output and the expected output and is the basis for subsequent adjustment.

[0110] Then, the compensation deviation is input into the triangular wave comparator to obtain the adjustment signal output by the triangular wave comparator.

[0111] Exemplarily, please refer to Figure 9 , Figure 9 which is a schematic diagram of triangular wave comparison control provided by the embodiment of the present application. As shown in the schematic diagram of Figure 9 , the triangular wave comparator includes a triangular wave generating circuit, a fourth operational amplifier OPA4, and a fifth operational amplifier OPA5. The connection relationship is as shown in the figure.

[0112] i is the carrier current signal of the triangular wave, is the modulated wave current signal. When >i, the PWM waveform outputs a high level; when <i, the PWM waveform outputs a low level. The system adopts a control method with a fixed switching frequency (10 kHz). The compensation deviation signal is compared with a high-frequency triangular carrier wave (carrier ratio N = fc / f = 200, modulation ratio M = 0.8 1.2) to generate a PWM adjustment signal with a specific duty cycle.

[0113] Finally, the compensation signal output by the compensation module is adjusted according to the adjustment signal. By controlling the turn-on and turn-off timing of the IGBT power devices in the compensation module through the compensation signal, the amplitude and phase of the compensation current output by the compensation module are adjusted in real time to make it quickly track the target compensation value.

[0114] As can be seen from the embodiments of this application, by adopting the triangular wave comparison current tracking control strategy, the accurate closed-loop control of the compensation signal is achieved, which improves the system stability and provides a reliable technical guarantee for the full-state compensation of single-phase grounding faults in the distribution network.

[0115] Optionally, before obtaining the actual compensation value from the compensation signal output by the sampling module and the compensation module, the method further includes: obtaining the circuit data of the target distribution network circuit, and pre-synchronizing the compensation module according to the circuit data; after the compensation module is pre-synchronized, connecting the compensation module to the target distribution network circuit; and adjusting the amplitude and phase of the compensation module according to the circuit data within a preset time.

[0116] Specifically, in this embodiment, before obtaining the actual compensation value from the compensation signal output by the sampling module and the compensation module, the active power compensator also acquires the circuit data of the target distribution network circuit. The circuit data includes key parameters such as system voltage, frequency, and phase.

[0117] Then, the compensation module is pre-synchronized based on circuit data. Specifically, in the proposed embodiment, the traditional line voltage synchronization scheme is abandoned, and low-voltage side phase voltage synchronization technology of voltage transformer is adopted to ensure that the voltage waveform output by the compensation module is consistent with the voltage waveform of the grounded phase in the target distribution network circuit. During the pre-synchronization process, the control system accurately tracks the phase and frequency of the system voltage through phase-locked loop technology, adjusts the output of the oscillator inside the compensation module, and achieves initial synchronization with the power grid.

[0118] After the compensation module is pre-synchronized, it is connected to the target distribution network circuit. At this point, the output characteristics of the compensation module are basically matched with the power grid, avoiding potential inrush currents or voltage surges that might occur during direct connection. Finally, the amplitude and phase of the compensation module are adjusted within a preset time according to the circuit data. This adjustment process is completed within 20ms after grid connection. The control system fine-tunes the voltage amplitude and phase output of the compensation module based on real-time collected circuit data, ensuring it is completely consistent with the system voltage, guaranteeing smooth grid connection and eliminating harmonic currents.

[0119] As can be seen from the embodiments of this application, the phase-synchronous grid connection control technology achieves rapid and accurate synchronization between the compensation module and the distribution network system. This pre-synchronization mechanism effectively avoids the inrush current and equipment damage caused by phase asynchrony in traditional solutions, ensuring the safe and reliable connection of the active compensator to the system and improving the dynamic response speed and stability of the system.

[0120] Example 3: The above application examples describe a single-phase ground fault compensation method that focuses on determining the compensation value. Based on this, and assuming that the active power compensator also includes a temperature sensing module, this application example also provides another more detailed single-phase ground fault compensation method.

[0121] Please see Figure 10 , Figure 10 This is a flowchart illustrating another single-phase ground fault compensation method provided in an embodiment of this application, which can be based on... Figure 1 The application scenario 100 shown is implemented, including steps S1001-S1009.

[0122] S1001: The active power compensator tunes the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, and the second distance is less than the first distance.

[0123] S1002: The active power compensator sampling module samples the zero-sequence electrical signal obtained by the zero-sequence system when the distance between the arc suppression coil and the resonant point is the second distance.

[0124] S1003: The active power compensator determines the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal.

[0125] S1004: The active power compensator determines the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point.

[0126] S1005: The active power compensator controls the compensation module to compensate the target distribution network circuit according to the target compensation value.

[0127] For detailed explanations of steps S1001-S1005, please refer to the explanations and related content of steps S401-S405, which will not be repeated here.

[0128] S1006: The active power compensator acquires temperature data collected by the temperature sensing module.

[0129] Specifically, the temperature data includes the real-time temperature of key components of the compensation module (such as IGBTs, thin-film capacitors, and other power devices), which is collected in real time by temperature sensing modules (such as thermocouples and thermistors) distributed at various key locations of the active power compensator.

[0130] S1007: The active power compensator obtains the temperature threshold of the target distribution network circuit.

[0131] Specifically, the active power compensator acquires the preset temperature threshold of the target distribution network circuit. The temperature threshold is a critical temperature value set according to the equipment's safe operation requirements, and its determination takes into account various factors such as the component's rated temperature, ambient temperature, and historical operating data.

[0132] S1008: If the temperature data is not less than the temperature threshold and the duration is not less than the first preset time, the active power compensator will perform derated operation control on the compensation module.

[0133] Specifically, if the temperature data is not less than the temperature threshold and the duration is not less than a first preset time (e.g., 5 minutes), then the compensation module is derating. Derating refers to reducing the output power of the compensation module (e.g., reducing the compensation current amplitude) to reduce device heating and prevent the temperature from rising continuously. In practice, the control system reduces the target compensation value by a certain percentage (e.g., 80%), thereby reducing the workload of power devices such as IGBTs.

[0134] S1009: If the temperature data is not less than the temperature threshold and the duration is not less than the second preset time, the active power compensator will trip the target distribution network circuit.

[0135] If the temperature data is not less than the temperature threshold and the duration is not less than the second preset time (e.g., 10 minutes, and the second preset time is greater than the first preset time), then the target distribution network circuit will trip for protection. This indicates that derating operation has failed to effectively control the temperature rise, the system judges that there is an overheating risk, and in order to avoid equipment damage, the control compensation module completely exits operation and triggers the corresponding protection circuit action.

[0136] As can be seen from the embodiments of this application, intelligent thermal management of the compensation module is realized through real-time monitoring by the temperature sensing module and the equipment hierarchical protection mechanism, which significantly improves the reliability and safety of the active power compensator in long-term operation and solves the overheating risk problem of high-power power electronic equipment in the fault compensation process.

[0137] Optionally, the temperature data includes the rated temperature and real-time temperature of the components of the compensation module. Obtaining the temperature threshold of the target distribution network circuit includes: obtaining a first preset temperature threshold; calculating the temperature threshold based on the preset temperature threshold, the difference between the rated temperature and the real-time temperature of the components, and the target compensation value, wherein the temperature threshold satisfies the following formula (2):

[0138] (2)

[0139] Where T1 is the temperature threshold, T0 is the first preset temperature threshold, P1 is the first weight, t0 is the real-time temperature of the component, t1 is the real-time temperature of the component, P2 is the second weight, u0 is the target compensation value, and Q is the conversion coefficient.

[0140] Specifically, in this embodiment, the specific calculation process for obtaining the temperature threshold of the target distribution network circuit is explained. Temperature data includes the rated temperature t1 and real-time temperature t0 of the compensation module components. Obtaining the temperature threshold of the target distribution network circuit includes the following steps:

[0141] First, obtain the first preset temperature threshold T0. The first preset temperature threshold T0 is a basic threshold set based on the safe operating temperature range of power devices (such as IGBTs, film capacitors, etc.) in the compensation module, or a fixed value set in advance.

[0142] Next, based on the first preset temperature threshold T0, the difference between the component's rated temperature t1 and the component's real-time temperature t0, and the target compensation value u0, the temperature threshold T1 is calculated using the above formula (2).

[0143] In equation (2), (t0 - t1) reflects the degree of deviation of the current temperature of the component from the rated temperature, while (u0 × Q) characterizes the current compensation load level of the system. The first weight P1 and the second weight P2 are configured according to the specific application scenario and device characteristics to balance the influence of temperature deviation and compensation load on the temperature threshold.

[0144] As can be seen, in this embodiment, a dynamic temperature threshold calculation model is established by introducing multiple parameters such as the real-time temperature of the component, the rated temperature, and the target compensation value. This intelligent calculation method can automatically adjust the temperature protection threshold according to the actual operating status of the equipment: when the component temperature is high or the compensation load is large, the temperature threshold is appropriately lowered to trigger protection in advance; when the operating conditions are good, the threshold is correspondingly increased to fully utilize the equipment capacity. This adaptive mechanism not only ensures equipment safety but also optimizes system operating efficiency, solves the problem that fixed temperature thresholds cannot adapt to complex operating conditions, and improves the reliability and service life of active power compensators in the single-phase ground fault compensation process.

[0145] Through the methods described in the above embodiments, it can be seen that in this solution, the zero-sequence signal is amplified by tuning near the resonant point, which improves the detection sensitivity of high-resistance faults and effectively solves the compensation blind zone of existing technologies and the safety hazards of traditional compensation schemes, thus improving the handling effect of single-phase grounding faults in cables. Dynamic gain control based on pulse width and signal amplitude enhances the detection capability of weak fault signals while avoiding signal saturation, improving measurement accuracy and system reliability. Impedance matching processing by the signal follower ensures the accuracy of fault signal acquisition. The residual voltage-residual current joint control strategy, the triangular wave comparison current tracking control strategy, and the over-phase synchronous grid-connected control technology provide effective technical means to solve high-resistance grounding faults. Real-time monitoring by the temperature sensing module and the equipment hierarchical protection mechanism improve the reliability and safety of the active power compensator during long-term operation.

[0146] Based on the description of the above configuration method embodiments, this application also provides a single-phase ground fault compensation processing device 1100, which can operate in... Figure 1 A computer program (including program code) is shown in the active power compensator 101 and is used to execute it. Figure 4 , Figure 7 and Figure 10 The method shown. See also Figure 11 , Figure 11 This is a schematic diagram of a single-phase ground fault compensation and processing device provided in an embodiment of this application. The single-phase ground fault compensation and processing device 1100 includes:

[0147] The adjustment unit 1101 is used to tune the arc suppression coil so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, the second distance being smaller than the first distance;

[0148] The acquisition unit 1102 is used to acquire the zero-sequence electrical signal obtained by the sampling module when the distance between the arc suppression coil and the resonant point is the second distance.

[0149] The determination unit 1103 is used to determine the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal;

[0150] The determining unit 1103 is used to determine the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point.

[0151] The compensation unit 1104 is used to control the compensation module to compensate the target distribution network circuit according to the target compensation value.

[0152] In one possible embodiment, the sampling module further includes a gain module. Before determining the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal, the determining unit 1103 is specifically used to: determine the pulse width of the zero-sequence electrical signal; determine the signal amplitude of the zero-sequence electrical signal based on the pulse width; determine the amplification factor of the zero-sequence electrical signal based on the signal amplitude, wherein the signal amplitude and the amplification factor are inversely correlated; and control the gain module to amplify the zero-sequence electrical signal based on the amplification factor.

[0153] In one possible embodiment, the sampling module further includes a signal follower, and before determining the pulse width of the zero-sequence electrical signal, the adjustment unit 1101 is specifically configured to: process the zero-sequence electrical signal based on the signal follower to increase the input impedance of the zero-sequence electrical signal and decrease the output impedance of the zero-sequence electrical signal.

[0154] In one possible embodiment, in determining the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point, the determining unit 1103 is further specifically used to: determine the composite error of the target distribution network circuit based on the residual voltage and residual current at the fault point; obtain the gain coefficient of the target distribution network circuit; and determine the target compensation value of the target distribution network circuit based on the composite error and the gain coefficient.

[0155] In one possible embodiment, the active power compensator further includes a triangular wave comparator. In terms of controlling the compensation module to compensate the target distribution network circuit according to the target compensation value, the acquisition unit 1102 is specifically used to: acquire the actual compensation value obtained by the sampling module sampling the compensation signal output by the compensation module; determine the compensation deviation of the compensation module according to the target compensation value and the actual compensation value; input the compensation deviation into the triangular wave comparator to obtain the adjustment signal output by the triangular wave comparator; and adjust the compensation signal output by the compensation module according to the adjustment signal.

[0156] In one possible embodiment, before obtaining the actual compensation value from the compensation signal output by the sampling module and the compensation module, the acquisition unit 1102 is further specifically used to: acquire the circuit data of the target distribution network circuit, pre-synchronize the compensation module according to the circuit data; after the compensation module is pre-synchronized, connect the compensation module to the target distribution network circuit; and adjust the amplitude and phase of the compensation module according to the circuit data within a preset time.

[0157] In one possible embodiment, the active power compensator further includes a temperature sensing module, and the acquisition unit 1102 is specifically used to: acquire temperature data collected by the temperature sensing module; acquire the temperature threshold of the target distribution network circuit; if the temperature data is not less than the temperature threshold and the duration is not less than a first preset time, then perform derating operation control on the compensation module; if the temperature data is not less than the temperature threshold and the duration is not less than a second preset time, then perform trip protection on the target distribution network circuit.

[0158] Based on the description of the above method and device embodiments, please refer to... Figure 12 , Figure 12 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 12 The electronic device 1200 shown (specifically, the electronic device 1200 may be a computer device) Figure 1 The active power compensator 101 shown includes a memory 1201, a processor 1202, a communication interface 1203, and a bus 1204. The memory 1201, processor 1202, and communication interface 1203 are interconnected via the bus 1204.

[0159] The memory 1201 may be a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM).

[0160] The memory 1201 can store programs. When the program code stored in the memory 1201 is executed by the processor 1202, the processor 1202 and the communication interface 1203 are used to execute the various steps of the single-phase ground fault compensation processing method of the embodiments of this application.

[0161] The processor 1202 may be a general-purpose central processing unit (CPU), microcontroller, application specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the electronic device 1200 of this application embodiment, or to execute the single-phase ground fault compensation processing method of this application method embodiment.

[0162] The processor 1202 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the single-phase ground fault compensation method of this application can be completed by the integrated logic circuits in the hardware of the processor 1202 or by instructions in software form. The processor 1202 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microcontroller or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in the memory 1201. The processor 1202 reads the information in the memory 1201 and, in conjunction with its hardware, performs the functions required by the units included in the electronic device 1200 of this application embodiment, or performs the single-phase grounding fault compensation processing method of this application method embodiment.

[0163] The communication interface 1203 uses a transceiver device, such as, but not limited to, a transceiver, to enable communication between the electronic device 1200 and other devices or communication networks. For example, data can be acquired through the communication interface 1203.

[0164] Bus 1204 may include a pathway for transmitting information between various components of electronic device 1200 (e.g., memory 1201, processor 1202, communication interface 1203).

[0165] It should be noted that, although Figure 12 The illustrated electronic device 1200 only shows a memory 1201, a processor 1202, and a communication interface 1203. However, those skilled in the art should understand that in specific implementations, the electronic device 1200 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the electronic device 1200 may also include hardware devices for implementing other additional functions. Moreover, those skilled in the art should understand that the electronic device 1200 may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 12 All the devices shown.

[0166] This application also provides a chip, which includes a processor and a data interface. The processor reads instructions stored in the memory through the data interface to implement the single-phase grounding fault compensation method.

[0167] Optionally, as one implementation, the chip may further include a memory storing instructions, and the processor is used to execute the instructions stored in the memory. When the instructions are executed, the processor is used to execute the single-phase ground fault compensation processing method.

[0168] This application also provides a computer-readable storage medium storing instructions that, when executed on a computer or processor, cause the computer or processor to perform one or more steps of any of the above methods.

[0169] This application also provides a computer program product containing instructions. When the computer program product is run on a computer or processor, it causes the computer or processor to perform one or more steps of any of the methods described above.

[0170] Those skilled in the art will appreciate that the functionality described in conjunction with the various illustrative logic blocks, modules, and algorithmic steps disclosed herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functionality described by the various illustrative logic blocks, modules, and steps can be stored or transmitted as one or more instructions or codes on a computer-readable medium and executed by a hardware-based processing unit. The computer-readable medium may comprise a computer-readable storage medium, which corresponds to a tangible medium, such as a data storage medium, or a communication medium that includes any medium facilitating the transfer of a computer program from one place to another (e.g., based on a communication protocol). In this way, the computer-readable medium may substantially correspond to (1) a non-transitory tangible computer-readable storage medium, or (2) a communication medium, such as a signal or carrier wave. The data storage medium may be any available medium accessible by one or more computers or one or more processors to retrieve instructions, code, and / or data structures for implementing the techniques described in this application. A computer program product may comprise a computer-readable medium.

[0171] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory, or any other media that can be used to store desired program code in the form of instructions or data structures and is accessible by a computer. Furthermore, any connection is properly referred to as computer-readable media. For example, if instructions are transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of media. However, it should be understood that the computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other temporary media, but are specifically addressed to non-temporary tangible storage media. As used herein, disks and optical discs include compact optical discs (CDs), laser optical discs, optical discs, digital versatile optical discs (DVDs), and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs reproduce data optically using lasers. The combination of the above items should also be included in the scope of computer-readable media.

[0172] Instructions can be executed by one or more processors, such as digital signal processors (DSPs), general-purpose microcontrollers, application-specific integrated circuits (ASICs), field-programmable arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Therefore, the term "processor" as used herein can refer to any of the foregoing structures or any other structures suitable for implementing the techniques described herein. Furthermore, in some aspects, the functionality described in the various illustrative logic blocks, modules, and steps described herein can be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated into combined codecs. Moreover, the techniques can be fully implemented within one or more circuit or logic elements.

[0173] The technology of this application can be implemented in a wide variety of devices or apparatuses, including wireless handheld devices, integrated circuits (ICs), or a set of ICs (e.g., chipsets). The various components, modules, or units described in this application are intended to emphasize functional aspects of the apparatus for performing the disclosed technology, but do not necessarily need to be implemented by different hardware units. In fact, as described above, the various units can be combined with suitable software and / or firmware within coded hardware units, or provided via interoperable hardware units (containing one or more processors as described above).

[0174] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the specific descriptions of the corresponding steps in the foregoing method embodiments, and will not be repeated here.

[0175] It should be understood that in the description of this application, unless otherwise stated, " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B can represent A or B; where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple. Additionally, to facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first," "second," etc., are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and the terms "first," "second," etc., do not necessarily imply difference. In this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0176] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the division of units is merely a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The coupling, direct coupling, or communication connection shown or discussed between each other may be indirect coupling or communication connection through some interfaces, apparatuses, or units, and may be electrical, mechanical, or other forms.

[0177] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0178] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. This computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be read-only memory (ROM), random access memory (RAM), or magnetic media, such as floppy disks, hard disks, magnetic tapes, magnetic disks, or optical media, such as digital versatile discs (DVDs), or semiconductor media, such as solid state disks (SSDs).

[0179] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

[0180] The device embodiments described above are merely illustrative. The units and modules described as separate components may or may not be physically separate. Furthermore, some or all of the units and modules can be selected to achieve the purpose of this embodiment, depending on actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0181] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for compensating for single-phase grounding faults, characterized in that, The method is applied to an active power compensator, which includes a sampling module, a compensation module, and a zero-sequence system. The zero-sequence system includes an arc suppression coil and is connected to the neutral point of the target distribution network circuit. The method includes: The arc suppression coil is tuned so that the distance between the arc suppression coil and the resonant point changes from a first distance to a second distance, where the second distance is less than the first distance. When the arc suppression coil and the resonant point are at a second distance, the sampling module samples the zero-sequence electrical signal obtained by the zero-sequence system. The residual voltage and residual current at the fault point of the target distribution network circuit are determined based on the zero-sequence electrical signal. Determining the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point specifically includes: determining the composite error of the target distribution network circuit based on the residual voltage and residual current at the fault point; obtaining the gain coefficient of the target distribution network circuit; and determining the target compensation value of the target distribution network circuit based on the composite error and the gain coefficient. The compensation module is controlled to compensate the target distribution network circuit according to the target compensation value.

2. The method according to claim 1, characterized in that, The sampling module further includes a gain module. Before determining the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal, the method further includes: Determine the pulse width of the zero-sequence electrical signal; The signal amplitude of the zero-sequence electrical signal is determined based on the pulse width. The amplification factor of the zero-sequence electrical signal is determined based on the signal amplitude, and the signal amplitude is inversely correlated with the amplification factor. The gain module is controlled to increase the gain of the zero-sequence electrical signal according to the amplification factor.

3. The method according to claim 2, characterized in that, The sampling module further includes a signal follower, and before determining the pulse width of the zero-sequence electrical signal, the method further includes: The zero-sequence electrical signal is processed by the signal follower to increase the input impedance of the zero-sequence electrical signal and decrease the output impedance of the zero-sequence electrical signal.

4. The method according to any one of claims 1-3, characterized in that, The active power compensator further includes a triangular wave comparator, and the step of controlling the compensation module to compensate the target distribution network circuit according to the target compensation value includes: The actual compensation value is obtained by the sampling module sampling the compensation signal output by the compensation module; The compensation deviation of the compensation module is determined based on the target compensation value and the actual compensation value; The compensation deviation is input into the triangular wave comparator to obtain the adjustment signal output by the triangular wave comparator; The compensation signal output by the compensation module is adjusted according to the adjustment signal.

5. The method according to claim 4, characterized in that, Before obtaining the actual compensation value obtained by the sampling module sampling the compensation signal output by the compensation module, the method further includes: Obtain the circuit data of the target distribution network circuit, and pre-synchronize the compensation module based on the circuit data; After the compensation module is pre-synchronized, the compensation module is connected to the target distribution network circuit; The compensation module is subjected to amplitude and phase adjustments within a preset time according to the circuit data.

6. The method according to any one of claims 1-3, characterized in that, The active power compensator further includes a temperature sensing module, and the method further includes: Acquire the temperature data collected by the temperature sensing module; Obtain the temperature threshold of the target distribution network circuit; If the temperature data is not less than the temperature threshold and the duration is not less than the first preset time, then the compensation module is subjected to derating control. If the temperature data is not less than the temperature threshold and the duration is not less than the second preset time, then the target distribution network circuit will be tripped for protection.

7. A single-phase ground fault compensation and processing device, characterized in that, The device is used to perform a single-phase ground fault compensation method. The device includes a sampling module, a compensation module, and a zero-sequence system. The zero-sequence system includes an arc-suppression coil and is connected to the neutral point of the target distribution network circuit. The device includes: An adjustment unit is used to tune the arc-suppression coil so that the distance between the arc-suppression coil and the resonant point changes from a first distance to a second distance, wherein the second distance is less than the first distance; The acquisition unit is used to acquire the zero-sequence electrical signal obtained by the sampling module from the zero-sequence system when the distance between the arc suppression coil and the resonant point is a second distance. The determining unit is used to determine the residual voltage and residual current at the fault point of the target distribution network circuit based on the zero-sequence electrical signal. The determining unit is configured to determine the target compensation value of the target distribution network circuit based on the residual voltage and residual current at the fault point, specifically including: determining the composite error of the target distribution network circuit based on the residual voltage and residual current at the fault point; obtaining the gain coefficient of the target distribution network circuit; and determining the target compensation value of the target distribution network circuit based on the composite error and the gain coefficient. The compensation unit is used to control the compensation module to compensate the target distribution network circuit according to the target compensation value.

8. An electronic device, characterized in that, The method includes a processor, a memory, a communication interface, and one or more programs, said programs being stored in the memory and configured to be executed by the processor, said programs including instructions for performing the steps of the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for electronic data interchange, wherein the computer program causes a computer to perform the method as described in any one of claims 1-6.

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