提升新能源电网中距离保护响应的策略

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中图分类号：TM77 文献标志码：A 文章编号：2097-3853（2025）04-0361-06

Strategies to improve response of distance protection in renewable power grid

HUANG Hui， DENG Huiqiong，HUANG Hongyu （Schoolof Electronic，Electrical Engineeringand Physics，FujianUniversityof Technology，Fuzhou ，China）

Abstract： With the wide application of renewable power generation system in power grid， its control strategy has an increasingly significant impact on distance protection performance.To solve this problem，a distance protection method based on voltage plane is proposed.Firstly，theoretical analysis reveals the performance degradation mechanism of the distance protection in the renewable power grid-connected system under fault conditions，especially the influence of the significant increase of the system power angle on the protection performance. Secondly，according to the characteristic that the system power angle is close to 90o after the fault，combined with the characteristic that the voltage cosine significantly increases the resistance to transition resistance when the power angle is large，an efective criterion for judging whether asymmetric phase fault occurs in the system is proposed.The simulation model constructed by Matlab/Simulink is verified，and results confirm that this scheme can reduce the interference of renewable power control strategies，showing a strong ability to resist transition resistance，and high sensitivity and reliability.

Keywords： distance protection； renewable power generation system； control strategy；transition resistance;voltage cosine quantity

距离保护作为输电线路保护的核心技术之一，因其保护范围及运行模式对系统运行状态变化的敏感性较低且能有效应对多种短路故障，在电力传输系统中得到了广泛应用[1-2]。（剩余6248字）