【摘要】 分析了特高压直流输电系统交流单相故障、触发系统故障和阀短路引起的换相失败的机理和后续控制保护特性,在南方电网主网等值系统下采用基于实时数字仿真仪的直流控制保护数模仿真平台对上述3类诱因引发的换相失败进行了仿真,分析了不同诱因下换相失败控制特性及保护配合,并检验其动态性能间的差异。仿真分析表明,特高压直流输电换相失败在不同的故障诱因下有不同的控制保护特性。更多还原

【Abstract】 The mechanism of commutation failures in ?800 kV DC power transmission caused by the single-phase fault in AC system,the fault of trigger system and short-circuit of converter valve as well as the characteristics of subsequent control and protection are analyzed.Using equivalent system of China Southern Power Grid,the commutation failures caused by above-mentioned three kinds of inducements are simulated by real-time digital simulation(RTDS) based digital-analogue simulation platform for DC control and protection,and the control characteristics and protection coordination under commutation failures caused by different inducements are researched and the differences among dynamic characteristics are investigated.Simulation results show that the characteristics of control and protection under commutation failures in ?800 kV DC power transmission caused by different inducements are not the same one another.更多还原