基于电压应力分析的柔性直流换流站故障限流阻抗参数优化  

Parameter Optimization for Fault Current Limiting Impedance of Flexible DC Converter Station Based on Voltage Stress Analysis

作　　者：魏能峤[1] 周念成[1] 罗永捷 王强钢[1] WEI Nengqiao;ZHOU Niancheng;LUO Yongjie;WANG Qianggang(State Key Laboratory of Power Transmission Equipment System Security and New Technology(Chongqing University),Chongqing 400044,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市400044

出　　处：《电力系统自动化》2020年第5期14-22,共9页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2018YFB0904600);国家自然科学基金资助项目(51707027)。

摘　　要：故障限流器(FCL)能在柔性直流电网短路故障识别后快速投入限流,以降低对直流断路器(DCCB)的要求。首先,通过分析FCL的工作原理,获取故障下含FCL的柔性直流换流站等效电路;计算不同阻抗类型的FCL故障电流和电压应力,分析其随故障限流阻抗参数变化的特征,提出理想限流阻抗并分析其特征。然后,提出以DCCB分断电流和FCL成本为优化目标的限流阻抗参数优化方法。在PSCAD/EMTDC中进行仿真对比,验证了电压应力计算和优化模型的正确性。Fault current limiter(FCL)could retrain fault current after identifying the short-circuit fault of the flexible DC grid to reduce the DC circuit breaker(DCCB)requirements.By analyzing the working principle of FCL,the equivalent circuit of flexible DC converter station including FCL with a fault is obtained.For the calculation of fault current and voltage stress of FCL with different impedance types,the characteristics of fault current limiting impedance parameters are analyzed,and the ideal current limiting impedance is proposed and its characteristics are analyzed.To optimize the DCCB breaking current and FCL cost,an optimization method for current limiting impedance parameter is proposed.Based on simulation in PSCAD/EMTDC,the correctness of the voltage stress calculation and optimization model is verified.

关 键 词：柔性直流换流站 故障限流器 限流阻抗 电压应力 参数优化 

分 类 号：TM721.1[电气工程—电力系统及自动化]