摘要
高压直流输电系统包含了各种分层控制方式,具有高度的可控性,因其中极控制层的交流电压起动型低压限流环节(VDCOL)不适于直流故障情况。为了向系统提供高效稳定的运行,对直流电压起动进行研究,分析了VDCOL的电路结构与工作原理,在此基础上,详细研究了直流控制方式和低压限流环节的参数对大扰动后交直流混合输电系统电压和功率恢复的影响。运用PSCAD/EMTDC在CIGRE直流输电标准测试系统上仿真验证的结果证明,VDCOL环节能改善直流输电系统在交直流故障后的恢复特性,对其研究具有一定的工程实用意义与参考价值。
HVDC transmission system uses hierarchical control method and has its advanced control performance. The purpose is to supply efficient and stable operation. This paper mainly studies the VDCOL which is a part of polar control level and activated by DC voltage, and analyzes its circuit structure and operation principle. Thereby, the influence of DC system control modes and the parameters of VDCOL on voltage and power recovery after large disturbance in hybrid AC/DC systems is researched, and the result is verified by PSCAD/EMTDC on CIGRE benchmark mode. VDCOL can improve the recovery characteristic of DC system under disturbance.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2008年第6期1110-1114,共5页
High Voltage Engineering
基金
湖南省“十一五”重大科技专项(06GK1003-1)~~
