A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation

Chen, Guipeng, Peng, Hao, Zeng, Rong, Hu, Yihua ORCID: 0000-0002-1007-1617 and Ni, Kai ORCID: 0000-0002-7467-2921 (2018) A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation. IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, 6 (3). pp. 1595-1604.

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Abstract

This paper proposes a fundamental frequency sorting algorithm for balancing the floating capacitors in modular multilevel converters with low-frequency carrier phase shift modulation. The relationship between the driving pulses and submodules (SMs) is rebuilt in every fundamental period by sorting the voltage increments and present voltages. Besides, an improved and simplified strategy is proposed to predict the charging abilities of the driving pulses, so as to avoid sorting the voltage increments. Based on the proposed method, the switching frequency of each power device and the carrier frequency are identical, which reduces the operational losses for applications regarding high power. At the same time, the sorting frequency is as low as the fundamental frequency, which alleviates a large amount of computational cost, and the necessity to measure arm currents is omitted. In this case, the arm current sensors are eliminated, and simplified communication among the central controller and the local ones is set up. Finally, a three-phase 1-MVA simulation platform with 120 SMs and a down-scaled 6-kVA experimental prototype with 48 SMs are constructed to validate the proposed approach.

Item Type:	Article
Uncontrolled Keywords:	Capacitor voltage balancing method, carrier phase shift (CPS) modulation, fundamental frequency sorting algorithm (FFSA), modular multilevel converter (MMC)
Depositing User:	Symplectic Admin
Date Deposited:	06 Mar 2019 09:52
Last Modified:	16 Mar 2024 20:09
DOI:	10.1109/JESTPE.2017.2764684
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3033823

Available Versions of this Item

• A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation. (deposited 21 Nov 2017 09:57)
  • A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation. (deposited 06 Mar 2019 09:52) [Currently Displayed]