特高压柔性直流内环电流异常原因分析及改进措施  

Abnormal Cause Analysis and Improved Measures of Flexible DC Inner Current

作　　者：王晨涛[1] 焦石 赖桂森 张健成 李舒维 赵成斌 WANG Chentao;JIAO Shi;LAI Guisen;ZHANG Jiancheng;LI Shuwei;ZHAO Chengbin(Guangzhou Bureau,EHV Power Transmission Company,CSG,Guangzhou 510663,China)

机构地区：[1]中国南方电网超高压输电公司广州局,广东广州510663

出　　处：《电工技术》2022年第23期236-238,242,共4页Electric Engineering

摘　　要：锁相环是柔性直流输电工程控制系统的关键技术之一。针对龙门换流站极2低端阀组控制系统内环电流异常导致换流器闭锁的情况,通过对故障录波的深入分析,发现现有控制策略中锁相环存在功能缺陷,于是提出预防锁相环饱和的改进措施,并在实时数字仿真系统RTDS仿真试验平台上进行仿真测试,以保障昆柳龙多端混合特高压直流输电系统安全稳定运行。Phase Locked Loop(PLL)is one of the key technologies of the VSC-HVDC control system.Aiming at the situation that inner current of the pole 2 low-end valve group control system of Longmen converter station of Kunliulong project causes the converter to block,through in-depth analysis of fault recorder,it is found that the existing control strategies have functional defects in the phase locked loop.Improvement measures to prevent phase-locked loop saturation are proposed.Simulation test is carried out on the RTDS simulation test platform of real-time digital simulation system to ensure the safe and stable operation of Kunliulong multi-terminal hybrid UHVDC transmission system.

关 键 词：柔性直流 锁相环 实时数字仿真系统 饱和 

分 类 号：TM721[电气工程—电力系统及自动化]