单阀中允许最多BOD触发晶闸管级数的简要分析

Analysis on Number Limitation of BOD Triggered Thyristors in a Thyristor Valve

中国溪洛渡贵广一回、贵广二回等直流输电工程中均采用了直接光触发晶闸管换流阀。为了满足超高压、特高压工程的要求,换流阀采用众多晶闸管的串联技术。为了确保触发的可靠性,作为后备紧急保护触发,在每个晶闸管内部有集成了转折二极管(BOD)电路。笔者就该电路的工作原理和单阀中允许最多BOD触发晶闸管级数的限定原则进行分析。

Light triggered thyristor valves have been widely used in many Chinese HVDC or UHVDC power transmission projects, such as Xiluodu Project, GG I Project, and GG II Project, where many thyristors are connected in series in a thyristor valve. Break over diode （BOD） circuits are integrated into each thyristor to ensure reliable stand-by emergent protective triggering. The author analyzes the working principle of BOD circuit, and discusses the limiting principle of the maximum number of thyristors triggered by the BOD circuits in a thyristor valve.