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中文摘要：
模块化多电平变流器（modular multilevel converter,MMC）启动过程需要对电容进行充电,目前主要采用不控充电,但该充电方法并不能将电容电压充到稳态运行时的电压值。为解决该问题,根据半桥子模块的3种工作状态,提出了闭锁充电过程和半闭锁充电过程,能将子模块的电容电压充到稳态运行时的电压值。3分析了交流侧和直流侧的闭锁和半闭锁充电过程,并提出了具体的实现方法。仿真结果表明了所提方法的有效性,电容能被充到稳态电压值,且充电过程中没有电流过冲。
英文摘要：
During the startup process of modular multilevel converter （MMC） the capacitor has to be charged and at present the uncontrolled charging is mainly used. However, using such a charging method the capacitor voltage cannot reach the value for the steady state operation of sub-modules. In allusion to it, based .on the three working conditions of half-bridge sub-module a block charging process and a half-block charging process, by which the capacitor voltage of sub-modules can be charged up to the value for the steady state operation of the sub-module, are proposed. The block charging process at the AC side as well as the half-block charging process at the DC side are analyzed, and concrete implementation approaches are put forward. Simialation results show that the proposed charging methods are available and the capacitor can be charged up to the value for its steady state operation, meanwhile there is no overshoot current during the charging process.
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