Open AccessMultiple sampling PSC‐PWM with hierarchical control architecture for MMC‐DSTATCOM
Author(s) -
Zhang Yuxiao,
Dai Ke,
Xu Chen,
Kang Yong,
Dai Ziwei
Publication year - 2019
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.815
H-Index - 97
eISSN - 1751-8679
pISSN - 1751-8660
DOI - 10.1049/iet-epa.2018.5784
Subject(s) - pulse width modulation , sampling (signal processing) , architecture , computer science , control theory (sociology) , control (management) , control engineering , engineering , electrical engineering , voltage , artificial intelligence , telecommunications , geography , archaeology , detector
The modular multilevel converter (MMC) is attractive for medium‐ and high‐power applications because of its high modularity, availability and power quality. In this study, a quadruple sampling phase‐shifted‐carrier pulse‐width modulation (PSC‐PWM) strategy based on hierarchical distributed control architecture for MMC in medium‐voltage power distribution static synchronous compensator (DSTATCOM) application is presented. Compared to centralised control architecture, the multi‐digital signal processors master–slave hierarchical control architecture can enhance the scalability of MMC‐DSTATCOM and the sub‐module (SM) number can expand without limitation. To take advantage of the proposed hierarchical architecture, the multiple sampling PSC‐PWM technique is employed to improve the converter performance. The spectrum of the electromotive force of MMC with quadruple sampling is almost the same as that of natural sampling, which leads to fewer harmonics in reactive and harmonic current compensating. Besides, it also raises the sampling frequency so that the MMC‐DSTATCOM can compensate harmonic at the low SM switching frequency. The effectivenesses of the proposed architecture and modulation method are verified by experimental results obtained from a 60 V/2 kVA downscaled prototype.