中文摘要：

针对模块化多电平换流器（modular multi-level converter，MMC）阀损解析计算结果不准确以及采用详细电磁暂态仿真计算耗时大的问题，本文提出一种利用MMC快速仿真模型精确计算中高频MMC阀损的计算方法。推导了利用MMC快速仿真模型精确计算MMC阀损的方法，提出MMC阀损的快速评估平台，并通过MMC详细开关模型与快速模型阀损计算结果比较验证了所提出的 MMC 快速计算模型阀损计算的准确性。而后对201电平 MMC 在50~1000 Hz 运行频率下的损耗进行了计算和对比，拟合了MMC阀损与有功功率以及MMC阀损与运行频率的关系。研究结果可以为中高频MMC的应用提供参考。

英文摘要：

The analytical method for MMC （modular multi-level converter） valve loss estimation is inaccurate while the method based on detailed electro-magnetic simulation is of low efficiency. To solve this problem, an accurate power loss evaluation method of MMC based on fast simulation of MMC was proposed. Mathematical equations for accurately evaluating the power loss were firstly deduced. A fast power loss evaluation platform was then proposed by linking the PSCAD/EMTDC and Matlab files. Accuracy of the power loss calculation result using the MMC fast simulation model was verified by comparing simulation results using the detailed switching model. Detailed analysis of a 201-level MMC running at 50~1000Hz was then presented. Relationship between the power loss and power transfer level and the relationship between the power loss and operating frequencies were presented and fitted. The research results of this paper can provide reference for the application of medium/high frequency MMC.