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

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.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [4]
  1. Xiamen Univ. (China)
  2. Zhejiang Univ., Hangzhou (China).
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Liverpool (United Kingdom)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1474487
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Journal of Emerging and Selected Topics in Power Electronics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2168-6777
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Chen, Guipeng, Peng, Hao, Zeng, Rong, Hu, Yihua, and Ni, Kai. A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation. United States: N. p., 2018. Web. doi:10.1109/JESTPE.2017.2764684.
Chen, Guipeng, Peng, Hao, Zeng, Rong, Hu, Yihua, & Ni, Kai. A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation. United States. doi:10.1109/JESTPE.2017.2764684.
Chen, Guipeng, Peng, Hao, Zeng, Rong, Hu, Yihua, and Ni, Kai. Sat . "A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation". United States. doi:10.1109/JESTPE.2017.2764684. https://www.osti.gov/servlets/purl/1474487.
@article{osti_1474487,
title = {A Fundamental Frequency Sorting Algorithm for Capacitor Voltage Balance of Modular Multilevel Converter With Low-Frequency Carrier Phase Shift Modulation},
author = {Chen, Guipeng and Peng, Hao and Zeng, Rong and Hu, Yihua and Ni, Kai},
abstractNote = {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.},
doi = {10.1109/JESTPE.2017.2764684},
journal = {IEEE Journal of Emerging and Selected Topics in Power Electronics},
number = 3,
volume = 6,
place = {United States},
year = {2018},
month = {9}
}

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