高压直流输电系统接地短路故障下的谐波电流分析与仿真研究  

Analysis and Simulation of Harmonic Current Under Ground Short Circuit Fault of HVDC System

作　　者：赵雯浩 周子瑶 王冰雁 蔺思玮 高成琨 朱迎怡 林奕含 ZHAO Wenhao;ZHOU Ziyao;WANG Bingyan;LIN Siwei;GAO Chengkun;ZHU Yingyi;LIN Yihan(China University of Mining and Technology,Xuzhou 221116,Jiangsu Province,China)

机构地区：[1]中国矿业大学,江苏徐州221116

出　　处：《电力与能源》2023年第5期441-447,455,共8页Power & Energy

摘　　要：高压直流输电系统发生短路故障后,短路电流会产生较大的电动力和热量,对设备、导体产生损坏,同时电网电压会大幅下降,危及电力系统的安全运行.针对12脉波换流器直流输电系统接地短路故障造成的谐波特性分布复杂、非特征次谐波问题,构建了单极性高压直流输电系统,探究了整流侧及逆变侧交流电源发生接地短路故障情况下直流电流与网侧电流的谐波分布.仿真结果表明:接地短路故障下,直流电流与网侧谐波电流畸变率的提升主要是由低次谐波引起的;短路故障发生在整流侧交流电源或逆变侧,对电流谐波分布的影响是不同的.该研究可为直流输电系统发生接地短路故障时的电流谐波特性分析以及谐波的抑制提供参考.When a short-circuit fault occurs in a HVDC transmission system,the short-circuit current will gener-ate large electrical power and heat,which will damage the equipment and conductors.At the same time,the power grid voltage will decrease significantly,endangering the safe operation of the power system.In order to solve the problem of complex harmonic distribution and non-characteristic orderharmonics caused by ground short circuit fault of 12-pulse converter HVDC system,a unipolar HVDC transmission system is constructed,and the harmonic distribution of DC current and grid current under the condition of ground short circuit fault of AC power supply on rectifier side and inverter side is investigated.The simulation results show that the distortion rate of DC current and harmonic current on the network side is mainly caused by the low orderharmonics.In the case that the short circuit fault occurs in the AC power supply on the rectifier side or the inverter side,the influence on the har-monic distribution of the current is different.This study provides a reference for current harmonic characteristics analysis and harmonic suppression of HVDC system when ground short circuit fault occurs.

关 键 词：高压直流输电 12脉波 接地短路故障 谐波电流畸变率 谐波特性 

分 类 号：TM721.1[电气工程—电力系统及自动化]