摘要
根据换流阀的触发控制及保护原理,结合常规直流、特高压直流输电工程实际,对不同技术路线的换流阀控制系统进行了对比分析。西门子换流阀控制原理时序性强,在导通期不会对保护性触发产生误判断。但是其恢复期保护的控制策略不尽合理,较容易发生误触发故障。ABB换流阀控制原理简单可靠,但是其在控制脉冲区间内,不能够准确区分电流断续补发触发脉冲和保护性触发,在进行开路试验及小电流情况下,易造成保护性触发误动作。通过分析直流输电工程中阀控系统出现的有关故障,总结出不同技术路线阀控系统的优缺点,并对存在的问题提出相关解决建议。
According to the theory of converter firing control and protection, this paper analyzes the valve control system’s merits and demerits compared with different techniques based on the actual situation of the HVDC and UHVDC transmissions. Siemens valve control system is sequential. It could verdict the protective pulse accurately during the conducting state, but could not do it because of the unperfect control strategy, during the recovery period. ABB valve control system is simple and reliable. But during the firing pulse appeared, it could not distinguish the firing pulse sent again because of the discontinuous current and the protective pulse accurately, and would make the protective trigger faulty act, in the OLT mode or under the small DC load.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2014年第20期146-149,共4页
Power System Protection and Control
