Thermal Sensitive Parameters Extraction Method of UHVDC Thyristors Based on TCAD

Power thyristor is one of core components of ultra-high voltage direct current (UHVDC) transmission system. The operating junction temperature of thyristor is an important parameter to evaluate the operation state and health for UHVDC station. Thermal sensitive parameter method is the most widely used for junction temperature estimation and monitoring of semiconductor devices. The data source is mainly experiments. UHVDC thyristor have the characteristics of large volume and high voltage and current levels, which leads to the high cost of extracting thermal sensitive parameters. This paper presents a method for extracting thermal sensitive parameters based on technology computer aided design (TCAD) simulation. By modeling and calibrating the thyristor used in ±1100kV converter stations in China, the main thermal and electrical characteristics of the thyristor meet the data manual indicators. The simulation of thermal sensitive parameters in the whole working condition range is realized by setting the combined working conditions. In addition, the automatic extraction of thermal sensitive parameters in simulation results is realized through tools command programming.