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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。
China Xiluodu Guiyu back to Guiyang second back and other DC transmission projects are used directly triggered thyristor valve. In order to meet the requirements of EHV and UHV projects, a series of thyristor series technology is adopted in the converter valve. In order to ensure the reliability of the trigger, as a backup emergency protection trigger, integrated in each thyristor turn diode (BOD) circuit. The author of the circuit and the working principle of the single valve allows up to BOD triggered thyristor series limit the principle of analysis.