混合直流输电系统控制策略分析与研究  

Hybrid HVDC System Control Strategy Analysis and Research

作　　者：张谢平 宁雪姣 ZHANG Xie-ping;NING Xue-jiao(East China Electric Power Design Institute Co.,Ltd.of CPECC,Shanghai 200063,China)

机构地区：[1]中国电力工程顾问集团华东电力设计院有限公司

出　　处：《电力勘测设计》2019年第12期28-33,39,共7页Electric Power Survey & Design

摘　　要：混合高压直流输电(high voltage direct current transmission,HVDC)结合了常规直流输电和柔性直流输电的优点,是高压输电的重点发展方向。本文介绍了三者在控制策略方面的差异及存在的问题,研究了电流源型换流器(line commutation converter,LCC)-模块化多电平换流器(modular multilevel converter,MMC)型混合直流系统的多段式启动控制策略,半桥MMC结合阻流二极管的直流线路故障限制措施,合理设置控制器参数提升交流系统故障穿越能力,检验了交流电压长期跌落系统的应对能力,并分析了控制系统稳定性。采用PSCAD/EMTDC软件搭建仿真模型,验证了控制策略的有效性,为实际工程提供参考。Hybrid HVDC combines the advantages of conventional HVDC and flexible HVDC,and is the key development direction of HVDC. This paper analyzes the differences between hybrid HVDC and conventional HVDC / flexible HVDC and existing problems. Multi-stage start control strategy of the LCC-MMC hybrid HVDC system is studied,and the direct-current line fault limiting measure of half-bridge MMC combined with resistive diode is researched.Setting controller parameters reasonably can improve alternating current system fault ride-through capability.The ability of the system to cope with long-term alternating current voltage drops is verified and the stability of the proposed control system is analyzed.Based on the actual project,the simulation model is built by PSCAD/EMTDC,which verifies the effectiveness of the control strategy and provides reference for practical engineering.

关 键 词：混合直流输电 控制策略 LCC-MMC 故障穿越 过电压限制 

分 类 号：TM72[电气工程—电力系统及自动化]