Analysis of Thermal Characteristics of Controllable Devices in HVDC Converter Station

The controllable device is one of the main heat sources in the HVDC converter station, and the controllable devices have a high requirement for temperature. This paper studies the heat and the cooling problems of thyristors in the converter station. Taking the thyristor on the rectification side of ± 800 kV /10000 MW HVDC as an example, firstly, the loss power of a single thyristor is calculated by simulation based on the datasheet of the thyristor and the actual circuit of the project. Then the thermal model of the thyristor and valve tower of the converter station are built in the Ansys environment. And the junction temperature characteristic of the thyristor at different power is analyzed. What is more, the temperature and airflow distribution of the valve tower are given. Thirdly, the temperature distribution characteristics of thyristors with series and parallel cooling modes are compared. Finally, the temperature characteristics of the thyristors in the converter station are summarized. The method of heat dissipation to ensure the uniform temperature distribution of thyristor is also given. And the study in the paper can provide technical reference for the safe operation of the converter station.