摘要
直流换相失败后的功率动态特性会对交流系统的安全稳定产生很大影响.文章从换相失败的本质出发,详细分析了直流换相失败的机理及影响因素.建立了多馈出直流输电系统模型,探讨直流闭锁对多馈出直流系统直流电流的影响,并分析直流闭锁引发换相失败的影响因素.基于直流标准测试系统搭建两回直流系统进行仿真验证,分析结果与仿真结果表明,直流系统间的耦合阻抗、交流系统的短路容量、直流闭锁容量都是影响多馈出直流系统发生换相失败的主要原因.
The power dynamic characteristics after DC commutation failure have a great impact on the safety and stability of AC system.Starting from the essence of commutation failure,the mechanism and influencing factors of DC commutation failure are analyzed in detail.A model of multi-outfeed HVDC transmission system is established.The influence of DC blockage on DC current of multi-outfeed HVDC system is discussed.The influencing factors of commutation failure caused by DC blockage are analyzed.Based on the DC Standard Test system,a two-circuit DC system is built for simulation and verification.The results of analysis and simulation show that the coupling impedance between DC systems,the short-circuit capacity of AC systems,and the DC blocking capacity are the main factors affecting the commutation failure of multi-outfeed DC systems.
作者
尹纯亚
李凤婷
张增强
余中平
YIN Chunya;LI Fengting;ZHANG Zengqiang;YU Zhongping(School of Electrical Engineering,Xinjiang University,Urumqi Xinjiang 830047,China;Economic Research Institute,State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi Xinjiang 830011,China)
出处
《新疆大学学报（自然科学版）》
CAS
2019年第2期138-145,共8页
Journal of Xinjiang University(Natural Science Edition)
基金
国家自然科学基金项目(51877185)
国家电网科技项目(SGXJJY00GHJS1800065)
关键词
换相失败
多馈出直流系统
直流闭锁
关断角
commutation failure
multi-outfeed DC system
DC blocking
Extinction angle
