Control method for suppressing forest fire through distribution line tree barrier and related device

Abstract

The invention discloses a control method and a related device for suppressing a forest fire by a distribution line tree barrier, and the method comprises the steps: increasing a voltage signal of a neutral point through a step-up transformer, and calculating the natural zero-sequence admittance of a power grid system to the ground; when a single-phase earth fault is detected, the output instruction current of the active inverter is adjusted in real time to compensate a power grid system, so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusting arc suppression coil and the natural zero-sequence admittance, and the equivalent admittance of the active inverter is dynamically adjusted; and when the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-adjusting arc suppression coil and the natural zero-sequence admittance and the duration is greater than a plurality of power frequency periods, the compensation is determined to be successful. Therefore, the problems of inaccurate detection and untimely arc extinction when an existing power distribution network deals with forest fire risks caused by tree obstacles are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of arc suppression coil tuning, and in particular to a control method and related device for suppressing wildfires caused by tree barriers on distribution lines. Background Art

[0002] With the advancement of new power system construction and the continued expansion of distribution networks, arc suppression coil tuning technology faces even more severe challenges. Especially in areas prone to wildfires, the probability of grid grounding faults increases significantly due to the combined effects of complex environmental factors such as high temperatures, smoke, and burning vegetation, further amplifying the inherent defects of traditional arc suppression coils. Existing passive arc suppression devices can only compensate for the reactive component of the grounding current, but are unable to eliminate rapidly rising harmonic and active currents. In complex faults such as multi-point grounding caused by wildfires, residual current often exceeds the 10A safety threshold specified in the DL / T620 standard, becoming a key inhibitor of arc reignition, equipment damage, and even the spread of wildfires.

[0003] Under the unique operating conditions of wildfires, grid parameters exhibit significant time-varying characteristics. High temperatures cause the line's insulation resistance to ground to drop by 40-60%, and the ground capacitance to fluctuate by as much as ±30%. Furthermore, the conductive particles and smoke produced by the combustion increase the 3rd, 5th, and 7th harmonics in the fault current by 2-3 times compared to normal operating conditions, with the active component accounting for over 10%. Even with full compensation for the reactive component, the vector superposition of harmonics and active components can still result in residual currents as high as 15-25A, far exceeding the arc self-extinguishing threshold. More seriously, the frequent intermittent arc-flash ground faults in wildfire areas generate high-frequency transient overvoltages, with peak values reaching 3.5 times the phase voltage, directly threatening the insulation strength of the lines.

[0004] The prominent problems exposed by existing technologies in wildfire scenarios are mainly reflected in the following: ① There is an inherent delay of 10-15ms in fault response. When the fault occurs in the ±15° phase interval of the voltage zero crossing point, the transient residual current amplitude can reach 2.8 times the steady-state value and last for more than 100ms, providing sufficient energy for arc reignition; ② The theoretical peak value of the displacement overvoltage caused by line break in the undercompensated state reaches 9.6pu, which can easily cause phase-to-phase flashover at weak insulation points caused by wildfires; ③ The nonlinear conductive characteristics of the combustion products cause the line-to-ground admittance to exhibit significant frequency-varying characteristics, resulting in the fault line selection accuracy rate dropping to below 65%.

[0005] In response to the special needs of wildfire disasters, it is urgent to develop an active fully compensated arc extinguishing system with active compensation capabilities to achieve coordinated compensation of fundamental reactive power, harmonic components and active components, significantly reduce the disaster risk caused by continuous arc burning, and provide key technical support for the construction of smart distribution networks in wildfire-sensitive areas. Summary of the Invention

[0006] The present invention provides a control method and related device for suppressing wildfires caused by tree barriers on distribution lines, which are used to solve the problems of inaccurate detection and untimely arc extinguishing in existing distribution networks when dealing with the risk of wildfires caused by tree barriers.

[0007] In view of this, a first aspect of the present invention provides a method for controlling a distribution line tree barrier to suppress a wildfire, the method comprising:

[0008] The method is applied to an active fully compensated arc suppression system provided in a substation. The active fully compensated arc suppression system comprises: an active inverter, a turn-adjusted arc suppression coil, a step-up transformer, and a ground fault analysis module. The active inverter and the turn-adjusted arc suppression coil are connected in parallel and connected to the neutral point via the step-up transformer.

[0009] Methods include:

[0010] S1. After the neutral point voltage signal is increased by the step-up transformer, the natural zero-sequence admittance of the power grid system to the ground is calculated;

[0011] S2. Initializing the control parameters of the active inverter and performing fault detection on the power grid system through the ground fault analysis module. If a single-phase ground fault is detected, executing step S3;

[0012] S3. Adjusting the output command current of the active inverter in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusting arc suppression coil and the natural zero-sequence admittance;

[0013] S4. Dynamically adjust the equivalent admittance of the active inverter. When the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-adjusting arc suppression coil and the natural zero-sequence admittance and the duration is greater than several power frequency cycles, it is determined that the compensation is successful.

[0014] Optionally, initializing the control parameters of the active inverter includes: setting a compensation current response time and setting a harmonic suppression range.

[0015] Optionally, the performing fault detection on the power grid system by the ground fault analysis module includes:

[0016] The zero-sequence voltage is collected in real time, and when the zero-sequence voltage is greater than zero, it is determined that a single-phase grounding fault occurs in the power grid system.

[0017] Optionally, it also includes:

[0018] After updating the control parameters of the active inverter, the output command current of the active inverter is adjusted in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance;

[0019] The updated control parameters include: zero-sequence capacitance and zero-sequence voltage.

[0020] A second aspect of the present invention provides a control system for suppressing wildfires by tree barriers on distribution lines, the system comprising:

[0021] The boost unit is used to calculate the natural zero-sequence admittance of the power grid system to the ground after boosting the neutral point voltage signal through the boost transformer;

[0022] The detection unit is used to initialize the control parameters of the active inverter and perform fault detection on the power grid system. If a single-phase grounding fault is detected, the compensation unit is triggered;

[0023] a first compensation unit, configured to adjust the output command current of the active inverter in real time to compensate the power grid system, so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusting arc suppression coil and the natural zero-sequence admittance;

[0024] The verification unit is used to dynamically adjust the equivalent admittance of the active inverter. When the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-adjusting arc suppression coil and the natural zero-sequence admittance and the duration is greater than several power frequency cycles, the compensation is determined to be successful.

[0025] Optionally, initializing the control parameters of the active inverter includes: setting a compensation current response time and setting a harmonic suppression range.

[0026] Optionally, the performing fault detection on the power grid system includes:

[0027] The zero-sequence voltage is collected in real time, and when the zero-sequence voltage is greater than zero, it is determined that a single-phase grounding fault occurs in the power grid system.

[0028] Optionally, it also includes:

[0029] a second compensation unit, configured to adjust the output command current of the active inverter in real time to compensate the power grid system after updating the control parameters of the active inverter, so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance;

[0030] The updated control parameters include: zero-sequence capacitance and zero-sequence voltage.

[0031] A third aspect of the present invention provides a control device for suppressing wildfires caused by tree barriers on distribution lines, the device comprising a processor and a memory:

[0032] The memory is used to store program code and transmit the program code to the processor;

[0033] The processor is configured to execute the steps of the control method for suppressing wildfires by tree barriers on distribution lines as described in the first aspect according to the instructions in the program code.

[0034] A fourth aspect of the present invention provides a computer-readable storage medium for storing program code, wherein the program code is used to execute the control method for suppressing wildfires by tree barriers on distribution lines as described in the first aspect.

[0035] It can be seen from the above technical solutions that the present invention has the following advantages:

[0036] The present invention provides a control method for suppressing wildfires caused by tree barriers on distribution lines. By calculating the equivalent zero-sequence admittance provided by the active inverter, the system zero-sequence admittance, and the zero-sequence admittance of the arc suppression coil, this method achieves holographic sensing and precise arc suppression of ground faults through a fourth-order closed-loop control strategy (detection-calculation-compensation-verification), thereby reducing the risk of tree barrier ignition. This solves the problems of inaccurate detection and untimely arc suppression that exist in existing distribution networks when addressing the risk of wildfires caused by tree barriers. Through precise zero-sequence admittance calculation and a closed-loop control strategy, the present control method is able to monitor ground fault conditions in the distribution network in real time and rapidly adjust the output of the active inverter to achieve precise arc suppression at the fault point, effectively reducing the risk of tree barrier ignition. Furthermore, the application of this method improves the operating efficiency and safety of the distribution network, reducing power outages and economic losses caused by wildfire failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 A flow chart of a method for controlling a distribution line tree barrier to suppress wildfires provided by an embodiment of the present invention;

[0039] Figure 2 Provided in accordance with an embodiment of the present invention;

[0040] Figure 3 A schematic structural diagram of a control system for suppressing wildfires by tree barriers on distribution lines provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] It should be clarified that the present invention provides a control method for suppressing wildfires caused by tree barriers on distribution lines. Its purpose is to effectively overcome the technical deficiencies of traditional arc suppression systems in tree line discharge fault detection and wildfire early warning. Targeting the specific working environment of distribution lines in areas prone to wildfires, this method creates a virtual neutral point by injecting a reverse compensation current in real time. It is suitable for areas highly sensitive to wildfires, such as forests and dense vegetation, and aims to provide an effective solution for building an intelligent distribution network with wildfire prevention and control capabilities. The specific steps of the control method are as follows:

[0043] See also Figure 1 In one embodiment of the present invention, a control method for suppressing wildfires caused by tree barriers on distribution lines is provided. The method is applied to an active fully compensated arc suppression system installed in a substation. The active fully compensated arc suppression system includes: an active inverter, a turn-type arc suppression coil, a step-up transformer, and a ground fault analysis module. The active inverter and the turn-type arc suppression coil are connected in parallel and connected to the neutral point via the step-up transformer. Figure 2 shown.

[0044] It should be noted that the turn-adjustable arc suppression coil is a device used in power systems and is a type of arc suppression coil. It is commonly used in power systems where the neutral point is not directly grounded. Its main function is to compensate for the capacitive current generated when the system has a single-phase grounding fault, so as to reduce the arc at the fault point and the hazards caused thereby. The turn-adjustable arc suppression coil of the present invention is used to compensate for fundamental reactive power. Active inverter An active inverter is a power electronic device that converts direct current into alternating current of the same frequency as the power grid and returns it to the power grid. In an active inverter, "active" means that it can be connected to the power grid and transmit electrical energy to the power grid. The active inverter of the present invention is used to compensate for active components and harmonic components, as well as to inject reverse compensation current in real time, thereby creating a virtual neutral point, and realizing accurate detection of discharge faults caused by tree barriers on distribution lines and early warning of wildfires, as follows.

[0045] Methods include:

[0046] Step 101: After the neutral point voltage signal is boosted by a step-up transformer, the natural zero-sequence admittance of the power grid system to ground is calculated.

[0047] As you can understand, calculating the natural zero-sequence admittance of the power grid system to ground is a key step in assessing system status. This admittance reflects the response characteristics of the neutral point current to ground when the power grid is unbalanced. Accurately measuring this admittance allows for further analysis of the stability and security of the power grid system. After the step-up transformer boosts the neutral point voltage signal, the system captures more precise current and voltage data, enabling the calculation of a more accurate zero-sequence admittance value. This step provides crucial data support for subsequent fault analysis and early warning.

[0048] It should be noted that after the neutral point voltage signal is increased by the step-up transformer, the I0 signal and zero-sequence voltage U0 signal of each feeder are collected to calculate the system's natural zero-sequence admittance to ground;

[0049] Taking a distribution network with n outgoing lines as an example, when the system operates normally, the natural zero-sequence admittance to ground in the zero-sequence network is:

[0050]

[0051] 、 are the equivalent conductance to ground and the equivalent susceptance to ground of each line respectively.

[0052] Step 102 : Initialize the control parameters of the active inverter and perform fault detection on the power grid system through the ground fault analysis module. If a single-phase ground fault is detected, execute step 103 .

[0053] It should be noted that initializing the control parameters of the active inverter includes: setting the compensation current response time, typically 60ms; and setting the harmonic suppression range, typically covering harmonics from the 3rd to the 50th order. Furthermore, the zero-sequence voltage U0 is acquired in real time through a zero-sequence voltage transformer. When the zero-sequence voltage U0 is greater than zero, a single-phase ground fault is determined to have occurred in the power grid system. It is understood that upon detecting a single-phase ground fault, the active inverter can respond quickly, outputting a compensation current according to a preset control strategy to suppress the fault current, thereby minimizing the fault's impact on the power grid system. Furthermore, setting the harmonic suppression range effectively reduces harmonic interference with the power grid system, improving its stability and reliability. Furthermore, real-time acquisition and evaluation of the zero-sequence voltage U0 enable accurate and rapid fault location, providing strong support for subsequent fault resolution.

[0054] Step 103: Adjust the output command current of the active inverter in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance.

[0055] As can be understood, this compensation process can quickly respond to ground faults, effectively suppress the fault current, and reduce the impact of the fault on the power grid. Furthermore, by precisely controlling the output command current of the active inverter, the zero-sequence admittance of the power grid can be precisely adjusted, thereby ensuring stable operation of the power grid.

[0056] It should be noted that the principle of the present invention for compensating the power grid system is described as follows:

[0057] Without considering the influence of compensation current, the zero-sequence current of the fault line is Equal to the sum of the zero-sequence currents of all non-fault lines;

[0058] ;

[0059] Fault point ground current The sum of the ground currents generated by the natural zero-sequence admittance of all lines:

[0060] ;

[0061] Where, 、 are the natural zero-sequence admittance of the fault line to ground.

[0062] Zero-sequence admittance value of the fault line for:

[0063] ;

[0064] Considering the impact of the active arc suppression device on the zero-sequence network, the zero-sequence admittance value of the fault line is:

[0065] ;

[0066] Where, and They are the zero-sequence admittance provided by the inverter and the zero-sequence admittance of the arc suppression coil, I Z is the inverter output current, I P Output current of arc suppression coil.

[0067] The total zero-sequence admittance of the system in the compensated state is:

[0068] ;

[0069] The grounding current at the fault point after considering the compensation effect is:

[0070] ;

[0071] To make the grounding current at the fault point 0, .

[0072] Therefore, the dynamic full compensation control strategy is obtained, the compensation current is generated, and the active inverter outputs the command current, which is as follows:

[0073] According to the zero-sequence admittance of the active inverter = value, adjust the active inverter output command current in real time to meet the zero sequence admittance = When , the grounding current at the fault point is 0.

[0074] Step 104: Dynamically adjust the equivalent admittance of the active inverter. When the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-type arc suppression coil and the natural zero-sequence admittance and the duration is greater than several power frequency cycles, the compensation is determined to be successful.

[0075] It should be noted that by dynamically adjusting the active inverter equivalent admittance, for example, when the zero-sequence admittance provided by the inverter is satisfied = Compensation is considered successful when the fault condition persists for more than five power frequency cycles. At this point, the system enters a stable state, with the active inverter continuously outputting the command current, ensuring that the ground current at the fault point remains near zero, effectively preventing tree fires caused by ground current. This control method also features real-time monitoring, enabling timely detection and response to abnormalities in the line, further enhancing the safety and reliability of the distribution line.

[0076] In one embodiment, the control method for suppressing wildfires caused by tree barriers on power distribution lines of the present invention further includes:

[0077] After the control parameters of the active inverter are updated, the output command current of the active inverter is adjusted in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance; wherein the updated control parameters include: zero-sequence capacitance and zero-sequence voltage.

[0078] It should be noted that, to better prevent and control wildfires, adaptive regulation can also be performed. Specifically, based on an online parameter adjustment algorithm, parameters such as zero-sequence capacitance C0 and zero-sequence voltage R0 are updated, dynamically adjusting the inverter output to cope with load fluctuations and line topology changes. It is understood that these parameter updates ensure that under different operating conditions, the active inverter can always provide the appropriate zero-sequence admittance, matching the sum of the zero-sequence admittance of the turn-type arc suppression coil and the natural zero-sequence admittance. In addition, the system can also be equipped with a real-time monitoring module to monitor the operating status of the power grid. Once an abnormal situation is detected, such as a sharp change in load or a sudden change in the line topology, the adaptive regulation mechanism is immediately triggered to quickly adjust the inverter output, thereby effectively suppressing the risk of wildfires caused by tree obstacles. Through such an adaptive regulation mechanism, the safety and stability of the distribution line can be significantly improved.

[0079] Embodiments of the present invention provide a control method for suppressing wildfires caused by tree barriers on distribution lines based on injection compensation technology. By calculating the equivalent zero-sequence admittance provided by the active inverter, the system zero-sequence admittance, and the zero-sequence admittance of the arc suppression coil, a fourth-order closed-loop control strategy (detection-calculation-compensation-verification) is employed to achieve holographic sensing and precise arc suppression of ground faults, reducing the risk of tree barrier ignition. This addresses the issues of inaccurate detection and untimely arc suppression that plague existing distribution networks in addressing the risk of wildfires caused by tree barriers. Through precise zero-sequence admittance calculation and a closed-loop control strategy, the control method of the present invention monitors ground fault conditions in the distribution network in real time and rapidly adjusts the output of the active inverter to achieve precise arc suppression at the fault point, effectively reducing the risk of tree barrier ignition. Furthermore, the application of this method improves the operational efficiency and safety of the distribution network, reducing power outages and economic losses caused by wildfires.

[0080] The above is a control method for suppressing wildfires by tree barriers on distribution lines provided in an embodiment of the present invention. The following is a control system for suppressing wildfires by tree barriers on distribution lines provided in an embodiment of the present invention.

[0081] See also Figure 3 In an embodiment of the present invention, a control system for suppressing wildfires caused by tree barriers on distribution lines is provided, comprising:

[0082] The boost unit 201 is used to calculate the natural zero-sequence admittance of the power grid system to the ground after boosting the neutral point voltage signal through the boost transformer;

[0083] The detection unit 202 is used to initialize the control parameters of the active inverter and perform fault detection on the power grid system. If a single-phase grounding fault is detected, the compensation unit is triggered;

[0084] The first compensation unit 203 is configured to adjust the output command current of the active inverter in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusting arc suppression coil and the natural zero-sequence admittance;

[0085] The verification unit 204 is used to dynamically adjust the equivalent admittance of the active inverter. When the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-type arc suppression coil and the natural zero-sequence admittance and the duration is greater than several power frequency cycles, the compensation is determined to be successful.

[0086] In one embodiment, the control system for suppressing wildfires by tree barriers on power distribution lines of the present invention further includes:

[0087] The second compensation unit is used to adjust the output command current of the active inverter in real time to compensate the power grid system after updating the control parameters of the active inverter, so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance; wherein the updated control parameters include: zero-sequence capacitance and zero-sequence voltage.

[0088] Embodiments of the present invention provide a control system for suppressing wildfires caused by tree barriers on distribution lines based on injection compensation technology. By calculating the equivalent zero-sequence admittance provided by the active inverter, the system zero-sequence admittance, and the zero-sequence admittance of the arc suppression coil, a fourth-order closed-loop control strategy (detection-calculation-compensation-verification) is employed to achieve holographic sensing and precise arc suppression of ground faults, reducing the risk of tree barrier ignition. This addresses the issues of inaccurate detection and untimely arc suppression that plague traditional distribution networks when addressing the risk of wildfires caused by tree barriers. The control method of the present invention, through precise zero-sequence admittance calculation and a closed-loop control strategy, monitors ground fault conditions in the distribution network in real time and rapidly adjusts the output of the active inverter to achieve precise arc suppression at the fault point, effectively reducing the risk of tree barrier ignition. Furthermore, the application of this system improves the operational efficiency and safety of the distribution network, reducing power outages and economic losses caused by wildfires.

[0089] Furthermore, an embodiment of the present invention provides a control device for suppressing wildfires caused by tree barriers on distribution lines, the device comprising a processor and a memory:

[0090] The memory is used to store program code and transmit the program code to the processor;

[0091] The processor is configured to execute the steps of the control method for suppressing wildfires by tree barriers on distribution lines as described in the above method embodiment according to the instructions in the program code.

[0092] Furthermore, an embodiment of the present invention also provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the control method for suppressing wildfires by tree barriers on distribution lines as described in the above method embodiment.

[0093] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0094] In the several embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the embodiments described above are merely illustrative. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0095] Units described as separate components may or may not be physically separate, and 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0096] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0097] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0098] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for controlling forest fires caused by tree barriers on power distribution lines, characterized in that: The method is applied to an active fully compensated arc suppression system provided in a substation. The active fully compensated arc suppression system comprises: an active inverter, a turn-adjusted arc suppression coil, a step-up transformer, and a ground fault analysis module. The active inverter and the turn-adjusted arc suppression coil are connected in parallel and connected to the neutral point via the step-up transformer. Methods include: S1. After the neutral point voltage signal is increased by the step-up transformer, the natural zero-sequence admittance of the power grid system to the ground is calculated; S2. Initializing the control parameters of the active inverter and performing fault detection on the power grid system through the ground fault analysis module. If a single-phase ground fault is detected, executing step S3; S3. Adjusting the output command current of the active inverter in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusting arc suppression coil and the natural zero-sequence admittance; S4. Dynamically adjust the equivalent admittance of the active inverter. When the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-adjusting arc suppression coil and the natural zero-sequence admittance and the duration is greater than several power frequency cycles, it is determined that the compensation is successful.

2. The method for controlling forest fires caused by tree barriers on power distribution lines according to claim 1, characterized in that: Initializing the control parameters of the active inverter includes setting a compensation current response time and a harmonic suppression range.

3. The method for controlling forest fires caused by tree barriers on power distribution lines according to claim 1, characterized in that: The performing fault detection on the power grid system by the ground fault analysis module includes: The zero-sequence voltage is collected in real time, and when the zero-sequence voltage is greater than zero, it is determined that a single-phase grounding fault occurs in the power grid system.

4. The method for controlling forest fires caused by tree barriers on power distribution lines according to claim 1, characterized in that: Also includes: After updating the control parameters of the active inverter, the output command current of the active inverter is adjusted in real time to compensate the power grid system so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance; The updated control parameters include: zero-sequence capacitance and zero-sequence voltage.

5. A control system for suppressing wildfires by tree barriers on distribution lines, characterized in that: include: The boost unit is used to calculate the natural zero-sequence admittance of the power grid system to the ground after boosting the neutral point voltage signal through the boost transformer; The detection unit is used to initialize the control parameters of the active inverter and perform fault detection on the power grid system. If a single-phase grounding fault is detected, the compensation unit is triggered; a first compensation unit, configured to adjust the output command current of the active inverter in real time to compensate the power grid system, so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusting arc suppression coil and the natural zero-sequence admittance; The verification unit is used to dynamically adjust the equivalent admittance of the active inverter. When the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance of the turn-adjusting arc suppression coil and the natural zero-sequence admittance and the duration is greater than several power frequency cycles, the compensation is determined to be successful.

6. The control system for suppressing wildfires caused by tree barriers on power distribution lines according to claim 5, characterized in that: Initializing the control parameters of the active inverter includes setting a compensation current response time and a harmonic suppression range.

7. The control system for suppressing wildfires caused by tree barriers on power distribution lines according to claim 5, characterized in that: The fault detection of the power grid system includes: The zero-sequence voltage is collected in real time, and when the zero-sequence voltage is greater than zero, it is determined that a single-phase grounding fault occurs in the power grid system.

8. The control system for suppressing wildfires caused by tree barriers on power distribution lines according to claim 5, characterized in that: Also includes: a second compensation unit, configured to adjust the output command current of the active inverter in real time to compensate the power grid system after updating the control parameters of the active inverter, so that the zero-sequence admittance provided by the active inverter is equal to the sum of the zero-sequence admittance provided by the turn-adjusted arc suppression coil and the natural zero-sequence admittance; The updated control parameters include: zero-sequence capacitance and zero-sequence voltage.

9. A control device for suppressing wildfires by tree barriers on power distribution lines, characterized in that: The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the control method for suppressing wildfires by tree barriers on distribution lines according to any one of claims 1 to 4 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store program codes, and the program codes are used to execute the control method for suppressing wildfires by tree barriers on distribution lines according to any one of claims 1 to 4.

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