水冷系统是模块化多电平换流器(Modular Multilevel Converter,MMC)必不可少的辅助系统,其正常运行是换流阀可靠工作的保证.这里以南京220 kV模块化多电平统一潮流控制器(Modular Multilevel Unified Power Flow Controller,MMUPFC)为研究对象,对MMUPFC及换流阀水冷系统进行了结构介绍.其次,针对目前MMUPFC正常运行时水冷系统去离子支路出现漏气的问题,在ANSYS-FLUENT仿真软件中对MMUPFC水冷系统去离子罐内液-气进行了多相流仿真建模,对故障形成机理进行了理论分析和研究.通过仿真研究,对水冷系统去离子罐内液位参数进行了设计.最后,在南京220kV MMUPFC换流站对水冷系统参数设计进行了实验验证,实验结果验证了这里设计的正确性和合理性.
Fault Analysis and Parameter Design of Water-Cooling System of MMC
The water-cooling system is an essential auxiliary system for modular multilevel converter(MMC)and the normal op-eration of the system is the guarantee of the reliability operation of the valve of MMC.Taking the Nanjing 220kV modular multi-level unified power flow controller(MMUPFC)as the research object,the structure of the MMUPFC and water-cooling system are introduced in this paper.And then,in order to solve the problem of air leakage in the deionizing branch of the water-cooling system during the normal operation of MMUPFC,a multiphase flow simulation model of the water-air flow in the deionizing tank is built in ANSYS-FLUENT simulation software and the fault formation mechanism is theoretically analyzed and studied.Besides,the liquid height in the deionization tank of the water cooling system is designed.Finally,the design of the water cool-ing system parameters are experimentally verified in Nanjing 220kV MMUPFC station,and the experimental results verified the correctness and rationality of the design method proposed in it.
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