LCC-VSC混合级联直流技术在江苏电网的应用研究  

Application of LCC-VSC Hybrid Cascaded DC Technology in Jiangsu Power Grid

作　　者：王之伟 郑建华 万振东 程亮 史大军 虞瑄 WANG Zhiwei;ZHENG Jianhua;WAN Zhendong;CHENG Liang;SHI Dajun;YU Xuan(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,Jiangsu Province,China;East China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Huangpu District,Shanghai 200001,China)

机构地区：[1]国网江苏省电力有限公司,江苏省南京市210000 [2]中国电力工程顾问集团华东电力设计院有限公司,上海市黄浦区200001

出　　处：《全球能源互联网》2025年第1期3-12,共10页Journal of Global Energy Interconnection

摘　　要：阐述了LCC-VSC混合级联直流拓扑方案和基本运行特性。结合江苏电网发展中存在的主要问题,分析了混合级联直流在江苏电网的应用背景。重点针对多直流馈入后的安全稳定、受端负荷中心受电能力提升等问题,研究并分析了应用混合级联直流技术的优势。研究分析表明,与常规直流技术相比,混合级联直流技术有利于降低受端多馈入直流间相互影响,有利于减少周边常规直流换相失败次数,有利于提高受端电网安全稳定水平。通过多个VSC换流器运行方式的灵活切换,可为交流电网提供必要的潮流控制和动态无功支撑能力,提升受端负荷中心受电能力。最后,结合江苏电网特点,提出了混合级联多端直流技术进一步发展和应用的设想。The LCC-VSC cascaded DC topology and basic operating characteristics are expounded.Combined with the main problems in the development of Jiangsu power grid,the application background of hybrid cascaded DC in Jiangsu power grid is analyzed.Focusing on the problems of security and stability with multi-feed DC and the improvement of the power receiving capacity of load center,the advantages of applying the hybrid cascaded DC technology are studied and analyzed.The research and analysis show that,compared with the conventional DC technology,the hybrid cascaded DC technology is beneficial to reduce the interaction between the multi-feeding DC at the receiving end,reduce the number of commutation failures of the nearby conventional DC,and improve the secutity and stability level of the receiving end power grid.Through the flexible switching of the operation modes of multiple VSC converters,the necessary power flow control and dynamic reactive power support capabilities can be provided for the AC power grid,and the power receiving capacity of the receiving end load center can be improved.Finally,combined with the characteristics of Jiangsu power grid,the idea of further development and application of hybrid cascaded multi-terminal DC technology is proposed.

关 键 词：混合级联直流系统 换相失败 江苏电网 直流多馈入系统 安全稳定 受端电网 

分 类 号：TM715[电气工程—电力系统及自动化] TM743