Distance protection methods, systems, apparatuses, devices, media, and products

CN122931611APending Publication Date: 2026-10-16TSINGHUA UNIVERSITY
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Patent Information

Application Number
CN202510423468.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-03
Publication Date
2026-10-16

AI Technical Summary

Technical Problem

[0003]参照图1，图1为光伏系统送出线路的简化接地故障图，其中，左侧RES为规模化光伏电源，右侧Gird为无穷大电网，中断线路代表送出线路，在该光伏送出场景中，送出线路发生包含过渡电阻Rg的接地故障，此时需要确定故障电阻Rg的测量阻抗值来确定故障点，而确定阻抗值受到故障与控制的双重影响，导致故障电阻的测量阻抗可能不够准确，导致距离保护机制产生拒动与误动的风险，以导致无法及时对故障进行检测以及对系统进行保护

Benefits of technology

[0049]The distance protection method, system, device, equipment, storage medium, and program product of this application embodiment can, in the event of a photovoltaic system fault, determine the amplitude change ratio of the current value by determining the amplitude change ratio of the voltage value, and simultaneously determine the current change phase angle of the current value based on the voltage phase angle change and amplitude change ratio of the voltage value. By optimizing the actual current value obtained through the current change amplitude and current change phase angle, the accurate measurement impedance is determined by the optimized actual current value and the second voltage amplitude, i.e., Ohm's law. This reduces the risk of distance protection failure and false tripping, thereby enabling timely fault detection and system protection.

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Abstract

The application discloses a distance protection method, system, device, equipment, medium and product. The method comprises the following steps: in response to a control strategy switching instruction, obtaining a first voltage amplitude, a second voltage amplitude, a voltage phase angle change, an actual current value and a rated current value based on the control strategy switching instruction; determining an amplitude change ratio based on the first voltage amplitude and the second voltage amplitude; determining a current change amplitude of a photovoltaic system according to the amplitude change ratio and the rated current value; determining a current change phase angle based on the amplitude change ratio and the voltage phase angle change; determining an optimized current value according to the current change amplitude and the current change phase angle; determining a measured impedance based on the ratio of the second voltage amplitude and the optimized actual current value; and performing a research and judgment action of distance protection according to the measured impedance. According to the embodiment of the application, accurate measured impedance values can be obtained in time, the risk of rejection and misoperation of distance protection is reduced, and faults can be detected.
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