Multiple sampling PSC-PWM with hierarchical control architecture for MMC-DSTATCOM

Yuxiao Zhang, Ke Dai (Corresponding author), Chen Xu, Yong Kang, Ziwei Dai

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)1431-1440
JournalIET Electric Power Applications
Volume13
Issue number10
DOIs
Publication statusPublished - Oct 2019
Externally publishedYes

Keywords

  • PWM power convertors
  • static VAr compensators
  • hierarchical systems
  • power supply quality
  • digital signal processing chips
  • distributed control
  • electric potential
  • sampling methods
  • centralised control architecture
  • multidigital signal processors master-slave hierarchical control architecture
  • MMC-DSTATCOM
  • sub-module number
  • hierarchical architecture
  • multiple sampling PSC-PWM technique
  • natural sampling
  • harmonic current compensating
  • sampling frequency
  • modulation method
  • modular multilevel converter
  • high-power applications
  • high modularity
  • power quality
  • quadruple sampling phase-shifted-carrier pulse-width modulation strategy
  • hierarchical distributed control architecture
  • medium-voltage power distribution static synchronous compensator application
  • apparent power 2
  • 0 kVA
  • voltage 60
  • 0 V

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