摘要
继发性换相失败给多馈入直流输电(MIDC)系统的安全运行带来严重威胁,针对继发性换相失败影响因素的研究有着非常重要的意义。首先根据换流器工作原理并结合MIDC系统结构特点研究了继发性换相失败的发生机理;然后对继发性换相失败的两个因素:换相失败引起交流电压的变化和多馈入直流输电系统耦合关系进行了详细的分析;最后在PSCAD/EMTDC中建立了MIDC系统模型,仿真分析了典型工况下MIDC系统继发性换相失败的影响因素。根据仿真结果,多馈入系统中交流故障、多馈入系统电压交互影响因子和多馈入短路比共同决定了继发性换相失败的发生。
In MIDC system, safety and stability of whole AC power system might be impacted seriously by followed commutation failure. It is important to research on factors of this fault. In this paper, the mechanism of followed commutation failure in multi-infeed HVDC transmission system is analyzed according to the operation and structure of MIDC system firstly. Then, based on the analysis results, AC voltage fluctuation by commutation failure and coupling of multi-infeed transmission HVDC system is studied respectively as the impact factors of followed commutation failure. Finally, a multi-infeed HVDC transmission system model is established in PSCAD/EMTDC, and the process of followed commutation failure in MIDC system under typical operation condition is presented. Comprehensive simulation results show that followed commutation failure in MIDC system would be codetermined by AC fault, MIIF and MSCR.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第5期72-78,84,共8页
High Voltage Apparatus
基金
国家电网科技项目(5209401350BW)~~
关键词
多馈入直流输电系统
继发性换相失败
交流故障
多馈入系统电压交互影响因子
多馈入短路比
multi-infeed HVDC transmission system
followed commutation failure
AC system fault
multi-infeed critical short circuit ratio
multi-infeed interaction factor
