基于PWM可控变换器的接地残流全补偿控制方法研究  

A residual current compensation control method based on a PWM-controlled converter

作　　者：王鹏 冯光 王晗[2] 陈明 张建文[2] 施刚[2] 贾雅君 WANG Peng;FENG Guang;WANG Han;CHEN Ming;ZHANG Jianwen;SHI Gang;JIA Yajun(Electric Power Research Institute of State Grid Hehan Electric Power Company,Zhengzhou 450052,China;Shanghai Jiao Tong University Wind Power Research Center,Shanghai 200240,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南郑州450052 [2]上海交通大学风力发电研究中心,上海200240

出　　处：《电力系统保护与控制》2021年第18期110-118,共9页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2018YFB1501300);国网河南省电力公司科技项目资助(SGHADK00PJJS2000062)。

摘　　要：针对配电网中传统全补偿消弧装置接地残流实时补偿能力差且在故障恢复后长期处于谐振状态而不能及时退出的问题,提出基于PWM可控变换器的接地残流全补偿控制方法。对全补偿消弧装置的消弧原理进行了详细分析,并利用主动频率注入法实现对地电容的精确检测。从理论上推导了零序电压与接地残流分量的关系,提出单相接地残流全补偿的实时控制方法。利用主动阻尼电流注入法实时检测接地故障恢复,并给出主动阻尼电流数值的计算依据。最后,对某10 kV配电网的单相接地故障进行了数字仿真研究。仿真结果表明,接地故障电流能够得到快速有效的全补偿,故障恢复后全补偿装置能够快速退出运行,验证了所提控制策略的正确性和可行性。There is a problem of poor real-time compensation ability of a grounding residual current of traditional full compensation arc suppression device in a distribution network.There is also a long-time resonance state after fault recovery.Thus a full compensation control method of grounding residual current based on a PWM-controllable converter is proposed.The principle of full compensation fault arc suppression is discussed in detail,and the capacitance to ground is measured by the frequency sweep method.The relationship between zero sequence voltage and residual current component is theoretically deduced,and a real-time control method of residual current full compensation is proposed.The active damping current injection method is used to detect the ground fault recovery in real time,and the calculation basis of active damping current is analyzed theoretically.Finally,a digital simulation study on the compensating effect of the fault current based on a 10 kV single-phase grounding distribution network is carried out.The results show that the grounding fault current can be compensated for quickly and effectively,and the full compensation device can quickly exit the operation after the fault recovery.This shows the correctness and feasibility of the proposed control strategy.

关 键 词：单相接地故障 PWM可控变换器 全补偿消弧线圈 残流补偿 主动阻尼电流 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM46