直流换流阀单元模块蒸发冷却系统的仿真分析与试验

对直流换流阀的发热问题和目前主流的水冷技术存在的缺陷进行研究,提出采用蒸发冷却技术用于直流换流阀单元模块的冷却。针对由5英寸晶闸管集成的直流换流阀单元模块,设计包含贴壁式蒸发器、集气管、回液管和冷凝器等组成的蒸发冷却系统。建立单元模块蒸发冷却的仿真分析模型,得到不同功率工况下晶闸管表面的温度分布情况。试验数据与仿真结果误差在8%以内,验证了计算和试验的准确性。研究表明,蒸发冷却技术的应用使得晶闸管的温度分布更加均匀,冷却余量增大,可保障直流换流阀单元模块的载流能力,这将为直流换流站采用蒸发冷却系统提供分析和设计依据。

Simulation and Experimental Study on the Evaporative Cooling System of HVDC Valve Unit

This paper summarized the heat problem and water cooling technology of HVDC converter valve,and presented applying evaporative cooling technology to HVDC field.A model was designed for the 5-inch thyristors,composed of a wall-type evaporator,gas collecting pipe,liquid tube and condenser,etc.Based on this model,the temperature fields of the thyristors in different power conditions are calculated by FEM.The percentage error between simulation data and experimental result is under 8％.And the results have verified the accuracy of the calculation and test.Studies have shown that the application of evaporative cooling technology makes the temperature distribution of thyristors more uniform,and the increasing of cooling margin can guarantee the current-carrying capacity of HVDC converter valve unit.These results will offer theoretical and design support for using of evaporative cooling technology in HVDC station.