柔性直流输电系统损耗计算方法及其实测分析

开展针对基于模块化多电平换流器的高压直流（modular multilevel converter based high voltage direct current，MMC-HVDC）输电系统的损耗研究，对高压直流输电系统的设计与优化具有重要意义。提出一种基于模块化多电平换流器的高压直流输电系统损耗计算的实用方法。首先，根据MMC-HVDC输电系统的拓扑结构和器件参数建立MMC-HVDC输电系统及其各个器件的损耗计算模型，并通过仿真计算精确求解MMC-HVDC输电系统及其器件不同运行工况的损耗系列数据；然后再利用数据拟合的方法得到便于工程应用的损耗计算公式；最后，针对厦门柔性直流输电系统工程，采用本文方法求得损耗计算公式，并与实测结果进行了对比分析。分析表明，利用该损耗拟合公式计算和评估MMC-HVDC输电系统的损耗可满足工程精度要求。

Power Loss Calculation Method and Practically Measured Results of VSC-HVDC Transmission System

The study on the power loss calculation method for modular multilevel converter based high voltage direct current （MMC-HVDC） transmission system has great importance to the design and optimization of HVDC transmission system. This paper proposes a practical power loss calculation method for MMC-HVDC. Firstly， we construct the power loss calculation models for MMC-HVDC and each component according to the topology of MMC-HVDC and the parameters of components， and exactly solve the loss data of MMC-HVDC and its components under different operating conditions through simulation calculation. Then， we use data fitting method to obtain the loss calculation formula convenient for engineering application. Finally， according to the VSC-HVDC transmission system in Xiamen， we compare the results of the proposed loss calculation formula with the practically measured results. The results show that the loss of MMC-HVDC calculated and evaluated by the proposed fitting formula can meet the engineering accuracy requirements.