接入新能源孤岛系统的双极柔性直流系统盈余功率耗散策略  

Surplus Power Dissipation Strategy for Bipolar VSC-HVDC System with Integration of Islanded Renewable Energy Generation System

作　　者：张福轩 郭贤珊 汪楠楠[2] 田杰[2] 卢宇[2] 董云龙[2] ZHANG Fuxuan;GUO Xianshan;WANG Nannan;TIAN Jie;LU Yu;DONG Yunlong(State Grid Corporation of China,Beijing 100031,China;NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]国家电网有限公司,北京市100031 [2]南京南瑞继保电气有限公司,江苏省南京市211102

出　　处：《电力系统自动化》2020年第5期154-160,共7页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2016YFB0900602);国家电网公司科技项目(52094017000W)。

摘　　要：大容量新能源电能采用孤岛方式通过双极柔性直流系统送出具有广阔的应用前景。文中对存在的非故障极过负荷和直流过电压情况下的功率盈余特性进行了分析,提出了分组交流耗能电阻方案,分别设计了送端换流器故障和直流过压下的功率盈余控制策略,通过分组交流耗能电阻的精确投切避免功率盈余引起双极柔性直流系统停运。通过四端柔性直流电网实时数字仿真器(RTDS)和EMTDC仿真系统,对提出的2种功率盈余控制策略进行验证。仿真结果表明,所提策略能够实现功率盈余工况下的故障穿越,避免故障范围扩大。Large-capacity renewable energy is transmitted through bipolar voltage source converter based high voltage direct current(VSC-HVDC) system in the island mode, which has broad application prospects. This paper analyzes the power surplus characteristics under the non-fault-pole overload and DC overvoltage conditions. Then the scheme of grouped AC energy dissipation resistor is proposed. The power surplus control strategies are designed in the cases of converter fault in sending end and DC overvoltage. By accurately switching the grouped AC energy dissipation resistor, the outage of bipolar VSC-HVDC system caused by power surplus is avoided. The proposed two power surplus control strategies are verified in real-time digital simulator(RTDS) and EMTDC simulation system of four-terminal VSC-HVDC power grid. Simulation results show that the proposed strategies can realize fault ride-through under the condition of power surplus, and the expansion of fault coverage can be avoided.

关 键 词：柔性直流输电 新能源 孤岛系统 功率盈余 分组交流耗能电阻 故障穿越 

分 类 号：TM721.1[电气工程—电力系统及自动化]