In weaklink power grids, after a normal main transformer closing without load,the inrush current is injected into power grid. It is very likely to cause large harmonic distortion at the end of the system, thus lead to serious harmonic overvoltage, which can cause damage to electrical equipment and load and bring serious economic losses. In order to solve the problem of overvoltage protection which is unable to respond to harmonic overvoltage for the existing transmission lines, the method of harmonic overvoltage protection for transmission lines is put forward. The proposed method can correctly respond to fundamental overvoltage and harmonic overvoltage of transmission line, effectively isolate the propagation of harmonic overvoltage in power grid and protect equipment from harmonic overvoltage damage. The effectiveness of the proposed method is verified by experiments.
参考文献
相似文献
引证文献
引用本文
丁宣文,朱 鑫,周文越.输电线路谐波过电压保护实现方法[J].四川电力技术,2023,46(3):66-70. DING Xuanwen, ZHU Xin, ZHOU Wenyue. Implementation Method of Harmonic Overvoltage Protection for Transmission Line[J]. SICHUAN ELECTRIC POWER TECHNOLOGY,2023,46(3):66-70.