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Power Flow Analysis and DC‐Capacitor Voltage Regulation for the MMCC‐DSCC
Author(s) -
Fujita Hideaki,
Hagiwara Makoto,
Akagi Hirofumi
Publication year - 2015
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22463
Subject(s) - chopper , capacitor , electrical engineering , engineering , power (physics) , voltage , modular design , electronic engineering , control theory (sociology) , computer science , physics , control (management) , quantum mechanics , artificial intelligence , operating system
SUMMARY 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.