特高压直流换流阀TFM板发热原因分析及改造

Root-cause analysis and modification of TFM heating of UHVDC converter valve

换流阀是特高压直流输电系统中的关键设备,是换流站的"心脏",其作用是把交流电变换成直流电(称为整流),或者把直流电变换成交流电(称为逆变).TFM板是特高压用晶闸管换流阀的核心器件,其主要功能是实现阀控和换流阀之间信号的光电转换,完成对换流阀的触发、保护、状态检测等功能.而TFM板故障将直接影响直流系统的安全稳定运行.针对TFM板发热原因进行了分析,重点讨论了改造实施情况,并提出改进建议.

Converter valve is the key equipment in the UHVDC transmission system. It is the "heart" of a converter station. It converts alternating current into direct current(called rectification), or direct current into alternating current(called inverter). TFM board is the core device of UHV thyristor valve. Its main function is to complete the light-electric conversion of signals between VBE and converter valve, and also has the functions of protection, triggering, detection for the converter valve.TFM-board fault will directly affect the safe and stable operation of the DC system. This paper analyzes the causes of TFM heating, focuses on the implementation of the revamping, and puts forward some suggestions for improvement.