模块化多电平换流器多维度建模方法研究

目前可用于对模块化多电平换流器系统进行分析的仿真模型包括详细模型、高速等效模型和宽频模型，三种仿真模型各有优劣，应用范围有限。结合详细模型、高速等效模型以及宽频模型的优点，采用每个桥臂每种子模块单个详细模型、剩余子模块高速等效模型的方法，并考虑实际系统杂散元件的影响，在桥臂对应位置接入杂散元件，建立了模块化多电平换流器多维度模型。该模型兼具器件级电磁暂态特性仿真能力、高效性以及高准确度的特点，能够满足对模块化多电平换流器系统仿真的所有需求。基于PSCAD/EMTDC搭建了双端系统进行仿真，验证了所建立模块化多电平换流器多维度模型的正确性和有效性。

Study on multi-dimension model of modular multilevel converter

Present simulation models used to analyze MMC-HVDC are limited, there is no a model which is suitable for all situations. This paper takes detail model, accelerated model and wide-band model as lessons, and acquires a multi-dimension model about modular multilevel converter. It has one sub-module as a detail model and the other sub-modules accelerated model per arm. It also considers the effect of stray elements of real system by accessing the stray elements to the right positions. This model has the ability of device level electromagnetic transient simulation, and has the characteristics of high-efficiency and high-accuracy, so it could meet all the demand when the MMC-HVDC is simulated. A two-terminal simulation model of MMC-HVDC is built in PSCAD/EMTDC. It turns out that the multi-dimension model of modular multilevel converter is correct and effective.