An Improved Strategy for Modular Multilevel Converter at Low Speed Operation

One of the main problems of the Modular Multilevel Converter (MMC) for ship electric propulsion applications is the significant magnitude of capacitor voltage ripple at low speed operation. The commonly used solution is harmonic injection. In this paper, the injection rules are explored through the...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-08, Vol.394 (4), p.42085
Main Authors: Zeng, Qifan, Xiao, Fei, Ai, Sheng, Ren, Qiang
Format: Article
Language:English
Subjects:
Capacitors
Converters
Electric potential
Electric propulsion
Harmonics
Injection current
Low speed
Ripples
Voltage
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Summary:One of the main problems of the Modular Multilevel Converter (MMC) for ship electric propulsion applications is the significant magnitude of capacitor voltage ripple at low speed operation. The commonly used solution is harmonic injection. In this paper, the injection rules are explored through the dynamic relationship of MMC in a comprehensive way, and the harmonic characteristics of injection current are derived. Furthermore, the circulating current controller is modified according to the harmonics of injected current with changing frequency, which reduces the ripple of capacitor voltage effectively in a wide speed range. Simulation results are shown to demonstrate the effectiveness of the proposed method.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/394/4/042085