引用本文:饶宇飞,张鹏辉,李程昊,等.励磁涌流对高压直流输电系统换相失败的影响机理及评估方法[J].电力系统保护与控制,2019,47(13):54-61.
RAO Yufei,ZHANG Penghui,LI Chenghao,et al.Mechanism and evaluating method for HVDC commutation failure caused by inrush current[J].Power System Protection and Control,2019,47(13):54-61
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励磁涌流对高压直流输电系统换相失败的影响机理及评估方法
饶宇飞1,张鹏辉2,李程昊1,田春笋1,方 舟1,焦在滨2
(1.国网河南省电力公司电力科学研究院，河南 郑州 450052; 2.陕西省智能电网重点实验室(西安交通大学)，陕西 西安 710049)
摘要:
交流系统中合空载变压器会产生严重的励磁涌流。该励磁涌流的注入，在导致逆变器交流母线电压发生畸变的同时，也会引起基波电压的变化，这必然会对逆变器的换相过程产生影响。目前的研究主要集中在基波电压下降造成的换相失败，对于电压畸变引起的换相失败的研究较少。从换相电压对时间的面积角度阐述了电压畸变导致换相失败的机理，在此基础上提出快速评估励磁涌流是否会造成换相失败的方法，从而为采取及时有效的措施提供指导，这对电网的安全稳定运行具有重要的意义。最后，在PSCAD/EMTDC中进行了仿真分析，验证了所提的评估方法的有效性。
关键词:  高压直流输电  励磁涌流  换相失败  电压畸变  换相电压对时间的面积
DOI：10.7667/PSPC20191308
分类号:
基金项目:国家自然科学基金项目资助(51377129)
Mechanism and evaluating method for HVDC commutation failure caused by inrush current
RAO Yufei1,ZHANG Penghui2,LI Chenghao1,TIAN Chunsun1,FANG Zhou1,JIAO Zaibin2
(1. Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China;2. Shaanxi Key Laboratory of Smart Grid (Xi’an Jiaotong University), Xi’an 710049, China)
Abstract:
Switching on no-load transformer in AC system will generate serious inrush current. The injection of this inrush current will lead to the change of fundamental voltage and voltage distortion at AC bus of inverter, which will inevitable influence the commutation process of the inverter. At present, the research is mainly focused on the commutation failure caused by the change of fundamental voltage, while the study of commutation failure resulted by voltage distortion is less. The mechanism of commutation failure created by voltage distortion is analyzed from a perspective of the commutation voltage time area. On this basis, a quick way to evaluate whether the inrush current will bring about commutation failure or not is proposed. This will provide guidance for taking timely and effective actions, which have great sense of making sure the grid operate safely and stably. Finally, the PSCAD/EMTDC simulation results prove the method of evaluation is effective. This work is supported by National Natural Science Foundation of China (No. 51377129).
Key words:  HVDC  inrush current  commutation failure  voltage distortion  commutation voltage time area
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