+AMD1:2019 CSV 高压直流（HVDC）系统用电压源换流器（VSC）阀的功率损耗第2部分:模块化多电平换流器

[中文适用范围]： IEC 62751的这一部分详细介绍了基于“模块化多电平转换器”的高压直流系统中阀门功率损耗的计算方法。适用于每个模块单元在每个开关位置仅使用单个关断半导体器件的情况，以及每个开关位置由多个关断半导体器件串联组成的情况（也称为“级联两电平转换器”）。主要公式适用于两电平“半桥”配置，但附录A也提供了如何将结果扩展到其他类型的MMC构建模块配置的指导。该标准主要针对绝缘栅双极晶体管（IGBT），但在使用其他类型的关断半导体器件时也可作为指导。除了转换器阀门之外，高压直流站中其他设备的功率损耗不在本标准的范围内。本标准不适用于线路换向转换器高压直流系统的转换器阀门。 [外文原描述]： IEC 62751-2:2014+A1:2019 gives the detailed method to be adopted for calculating the power losses in the valves for an HVDC system based on the "modular multi-level converter", where each valve in the converter consists of a number of self-contained, two-terminal controllable voltage sources connected in series. It is applicable both for the cases where each modular cell uses only a single turn-off semiconductor device in each switch position, and the case where each switch position consists of a number of turn-off semiconductor devices in series (topology also referred to as "cascaded two-level converter"). The main formulae are given for the two-level "half-bridge" configuration but guidance is also given as to how to extend the results to certain other types of MMC building block configuration. This consolidated version consists of the first edition (2014) and its amendment 1 (2019). Therefore, no need to order amendments in addition to this publication.