用于弱电网互联的柔性直流输电系统双端构网型控制  

Dual-end grid-forming control of flexible DC transmission system for weak grid interconnection

作　　者：蔡海青 郭琦 杨仁炘 黄立滨 施刚[3] 顾浩瀚 苏明章 CAI Haiqing;GUO Qi;YANG Renxin;HUANG Libin;SHI Gang;GU Haohan;SU Mingzhang(State Key Laboratory of HVDC,Electric Power Research Institute of China Southern Power Grid,Guangzhou 510663,China;National Energy Power Grid Technology R&D Centre,Guangzhou 510663,China;School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System,Guangzhou 510663,China;Key Laboratory for Power System Simulation of China Southern Power Grid,Guangzhou 510663,China)

机构地区：[1]南方电网科学研究院有限责任公司直流输电技术全国重点实验室,广东广州510663 [2]国家能源大电网技术研发(实验)中心,广东广州510663 [3]上海交通大学电子信息与电气工程学院,上海200240 [4]广东省新能源电力系统智能运行与控制企业重点实验室,广东广州510663 [5]中国南方电网公司电网仿真重点实验室,广东广州510663

出　　处：《电力自动化设备》2023年第9期202-209,共8页Electric Power Automation Equipment

基　　金：广东省新能源电力系统智能运行与控制企业重点实验室开放基金资助项目(GPKLIOCNEPS⁃2022⁃KF⁃01)。

摘　　要：针对常规跟网型控制下柔性直流输电系统不具备电网频率支撑能力、弱电网运行能力差的问题,提出了一种柔性直流输电系统的双端构网型控制策略.利用直流电容的动力学特性,将柔性直流输电系统模拟为同步电动机-连轴-同步发电机运行,使其具备良好的弱电网运行能力与电网主动支撑能力.在此基础上,设计了柔性直流输电系统的电网故障穿越策略.在PSCAD/EMTDC软件中进行仿真验证,结果表明所提柔性直流输电系统的双端构网型控制策略具备弱电网适应能力、快速潮流调节能力、电网频率主动支撑能力以及电网故障穿越能力.In order to solve the problem that the flexible DC transmission system under the conventional grid-following control does not have the ability to support the grid frequency and the operation performance under weak grid conditions is poor,a dual-end grid-forming control of flexible DC transmission system is proposed.Based on the inherent dynamics of DC capacitance,the flexible DC transmission system is emu⁃lated as a synchronous motor-shaft-synchronous generator system,so that it has good weak grid operation ability and active grid support ability.On this basis,the fault ride-through strategy of the flexible DC trans-mission system is designed.The simulative results of PSCAD/EMTDC show that the proposed control strategy has the weak grid adaptation capability,fast power flow regulation capability,active frequency support capability and grid fault ride-through capability.

关 键 词：柔性直流输电 弱电网 构网型控制 频率支撑 故障穿越 

分 类 号：TM721.1[电气工程—电力系统及自动化]