逆变侧交流线路单相自适应重合闸的适用性分析与改进策略  

Applicability Analysis and Improved Strategy of Adaptive Single-phase Reclosure for AC Lines on Inverter Side

作　　者：宋金钊 李永丽[1] 张云柯 徐泉洲 SONG Jinzhao;LI Yongli;ZHANG Yunke;XU Quanzhou(Key Laboratory of Smart Grid,Tianjin University,Tianjin 300072,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津300072

出　　处：《高电压技术》2022年第3期1001-1010,共10页High Voltage Engineering

基　　金：国家重点研发计划(2016YFB0900603);国家电网有限公司科技项目(52094017000W)。

摘　　要：由于高压直流输电的换相失败问题以及直流控制系统的非线性响应,逆变侧交流架空输电线路发生单相接地故障后的电气量特征与纯交流系统不同。逆变侧交流架空输电线路单相跳闸后换流母线非故障相工频电压幅值、输电线路电流幅值和相位仍有短时波动,而纯交流系统中几乎无波动。分析了逆变侧交流系统电气量特征对单相跳闸后断开相恢复电压的影响。在此基础上,研究了传统单相自适应重合闸判据在逆变侧交流架空输电线路中的适用性。研究发现,由于断开相工频恢复电压在跳闸初期的波动,部分传统判据无法准确识别故障性质。针对这一问题,提出了适用于逆变侧交流架空输电线路的单相自适应重合闸判据改进策略。基于PSCAD/EMTDC的仿真数据验证了所分析的正确性及改进策略的有效性。Due to the commutation failure of high voltage direct current(HVDC)system and the nonlinear response of HVDC control,the electrical characteristics of high voltage alternating current(HVAC)overhead transmission lines on inverter side after occurrence of single-phase ground faults are different from those of pure HVAC system.After the single-phase tripping of AC overhead transmission line at inverter side,the amplitudes and the phases of power frequency voltage and transmission line current of the non-fault phase of commutation bus may still fluctuate for a short time,while there is hardly any fluctuation in the pure AC system.Therefore,we analyzed the influences of the electrical characteristics of the inverter side HVAC system on the recovery voltage of open phase after single-phase trip.Then,we investigated the applicability of traditional adaptive single-phase reclosure criterion to HVAC overhead transmission lines on the inverter side.The results show that,due to the fluctuation of power frequency recovery voltage at the initial stage of tripping,some traditional criteria cannot accurately identify the fault nature.To solve the problem above,an improved strategy of adaptive single-phase reclosure criterion for inverter side HVAC overhead transmission lines is proposed.The simulation results based on the PSCAD/EMTDC verify the correctness of the analysis and the effectiveness of the improved strategy.

关 键 词：单相自适应重合闸 纯交流系统 逆变侧交流系统 工频恢复电压 适用性分析 改进策略 

分 类 号：TM762.2[电气工程—电力系统及自动化]