A Flexible DC Voltage Balancing Control Based on the Power Flow Management for Star-Connected Cascaded H-Bridge Converter

This paper presents the flexible dc capacitor voltages balancing control method for star-connected cascaded H-bridge converters. In this paper, the power flows are analyzed by investigating all the converter's control freedoms. Based on the analyses, users can accomplish the dc capacitor voltag...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2016-11, Vol.52 (6), p.4946-4954
Main Authors: Chen, Hsin-Chih, Wu, Ping-Heng, Lee, Chia-Tse, Wang, Ching-Wei, Yang, Ching-Hsiang, Cheng, Po-Tai
Format: Article
Language:English
Subjects:
Automatic voltage control
Balancing
Capacitor voltage balancing control
Capacitors
Control methods
Electric converters
Electric potential
low-voltage ride-through (LVRT)
Mathematical model
modular multilevel cascaded converter
Power conversion
Power flow
Pulse width modulation
PWM cascaded converter
Static synchronous compensators
static synchronous compensators (STATCOM)
Voltage
Weighting
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Summary:This paper presents the flexible dc capacitor voltages balancing control method for star-connected cascaded H-bridge converters. In this paper, the power flows are analyzed by investigating all the converter's control freedoms. Based on the analyses, users can accomplish the dc capacitor voltage balancing with both negative-sequence current and zero-sequence voltage. These two kinds of control options are further integrated together with the defined weighting factor K. The low-voltage ride-through operation of a proposed control method is also discussed in this paper. The control method is verified with a 220-V 1-kVA static synchronous compensators based on the star-connected cascaded H-bridge converters, and the experimental test results show that all the dc voltages are well regulated at the commanded value with different weighting factor K.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2016.2600667