针对新能源场站送出线两相短路的负序阻抗重构距离保护  

Distance Protection Based on Negative-sequence Impedance Reconstruction for Phase-to-phase Short Circuit of Renewable Power Plant Transmission Lines

作　　者：晁晨栩 郑晓冬[1] 邰能灵[1] 叶海 刘虎林 韩俊 CHAO Chenru;ZHENG Xiaodong;TAI Nengling;YE Hai;LIU Hulin;HAN Jun(Key Laboratory of Control of Power Transmission and Conversion,Ministry of Education(Shanghai Jiao Tong University),Shanghai 200240,China;East China Branch of State Grid Corporation of China,Shanghai 200120,China)

机构地区：[1]电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市200240 [2]国家电网有限公司华东分部,上海市200120

出　　处：《电力系统自动化》2023年第22期101-109,共9页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52277112);上海市启明星计划资助项目(18QA1402100)。

摘　　要：受逆变器控制策略影响,逆变型新能源场站短路电流呈现幅值受限和相位受控特性。新能源场站送出线路及其下级线路发生两相短路故障时,送出线路逆变侧距离保护存在拒动和误动风险。文中提出适用于逆变电源的负序阻抗重构策略,使新能源场站在两相短路故障期间能够表现出恒定的负序阻抗角。在负序阻抗重构策略的配合下,附加阻抗角能够通过本地测量值准确求取,根据所求附加阻抗角自适应调整距离保护动作区域,提出负序阻抗重构距离保护方案。所提保护方案能够有效避免逆变侧距离保护在区内外非金属性两相短路故障下的拒动和误动,适应不同的新能源场站无功支撑策略。测试结果表明所提保护方案可以准确识别区内外非金属性两相短路故障。Affected by the control strategy,inverter-interfaced renewable power plants(IIRPPs)present the characteristics of limited short-circuit current amplitude and controlled phase.There are risks of malfunction of IIRPP-side distance protection during phase-to-phase faults.In this paper,a negative-sequence impedance reconstruction strategy suitable for inverter-based source is proposed,so that IIRPP can present a constant negative sequence impedance angle during phase-to-phase faults.With the cooperation of the negative sequence impedance reconstruction strategy,the additional impedance angle can be obtained by local measurements.The trip region is adjusted according to the additional impedance angle,and a distance protection scheme based on negative sequence impedance reconstruction is proposed.The proposed protection scheme can effectively avoid the malfunction of IIRPP-side distance protection during non-metallic phase-to-phase faults,and can adapt to different reactive power support strategies.The test results show that the proposed protection scheme can accurately identify external and internal non-metallic phase-to-phase faults.

关 键 词：新能源场站 距离保护 过渡电阻 附加阻抗 两相短路故障 

分 类 号：TM773[电气工程—电力系统及自动化]