MMC-HVDC启动控制策略研究综述

A Survey of Research on Start-up Control Strategy based on MMC-HVDC

在基于模块化多电平换流器(MMC)高压直流输电系统(MMC-HVDC)正常运行之前需对换流器桥臂子模块电容预充电,为了减少预充电阶段产生的电压电流冲击,需对系统的预充电启动策略进行设计。首先分析了MMC的拓扑结构,工作原理和数学模型。然后重点阐述了MMC-HVDC系统的预充电过程,限流电阻的选取原则,单站和双站预充电策略并对其进行总结分析,以此为基础指出了今后关于MMC-HVDC启动控制方面的研究趋势和方向。

Before the normal operation of the modular multi-level converter （MMC） HVDC transmission system （MMC-HVDC）, it is necessary to pre-charge the capacitor of the converter arm sub-module, in order to reduce the voltage and current impact generated during the pre-charging phase, the system＇s pre-charge strategy need to be designed. Firstly, the topological structure, working principle and mathematical model of MMC are analyzed. Then, the pre-charging process of the MMC-HVDC system, the selection principle of the current limiting resistor, the single-station and dual-station pre-charging strategy are concluded and analyzed. Based on this, the research trends and directions of the MMC-HVDC control are pointed out.