Power Flow Analysis and DC‐Capacitor Voltage Regulation for the MMCC‐DSCC
Power Flow Analysis and DC‐Capacitor Voltage Regulation for the MMCC‐DSCC
复制标题
MMCC-DSCC 的潮流分析和直流电容器电压调节
DOI：
10.1002/eej.22463
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发表时间：
2015
影响因子：
0.4
通讯作者：
H. Akagi
中科院分区：
文献类型：
--
作者：
H. Fujita;M. Hagiwara;H. Akagi
本文讨论了一种基于双星星斩波单元（DSCC）的模块化多电平级联变换器（MMCC）的功率流分析和直流电容电压调节。该分析揭示了通过直流链路的循环电流与流出或流入每个斩波器单元的平均功率之间的关系。循环电流的DC分量向斩波器单元的上串和下串提供一半的有效输出功率，而相反，基频分量在上串和下串之间传输一定量的功率。因此，MDCC-DSCC可以通过控制循环电流的基频分量的幅度来平衡单元之间的电容器电压。提出了一种基于潮流分析的新型控制方法，并通过电路仿真验证了该方法的有效性。
This paper discusses power flow analysis and DC capacitor voltage regulation of a modular multilevel cascaded converter (MMCC) based on double‐star chopper cells (DSCC). This analysis reveals the relationship between the circulating current through the DC link and the average power flowing out of or into each chopper cell. The DC component of the circulating current supplies half the active output power to the upper and lower strings of the chopper cells, while in contrast the fundamental frequency component transfers an amount of power between the upper and lower strings. Thus, the MDCC–DSCC can balance the capacitor voltages among the cells by controlling the amplitude of the fundamental frequency component of the circulating current. A new control method based on power flow analysis is employed, and its effectiveness is verified by circuit simulation.