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    SHE-PWM cascaded multilevel converter with adjustable DC sources control for STATCOM applications

    Access Status
    Fulltext not available
    Authors
    Law, Kah Haw
    Dahidah, M.
    Konstantinou, G.
    Agelidis, V.
    Date
    2012
    Type
    Conference Paper
    
    Metadata
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    Citation
    Law, K.H. and Dahidah, M. and Konstantinou, G. and Agelidis, V. 2012. SHE-PWM cascaded multilevel converter with adjustable DC sources control for STATCOM applications, pp. 330-334.
    Source Title
    Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012
    DOI
    10.1109/IPEMC.2012.6258867
    ISBN
    9781457720864
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/62742
    Collection
    • Curtin Research Publications
    Abstract

    This paper presents a new variation of the selective harmonic elimination pulse width modulation (SHE-PWM) technique applied to cascaded multilevel converter based STATCOM system. The DC voltage levels of the cascaded H-bridge converter are assumed variables, hence increasing the degrees of freedom in the formulation of the problem. This approach allows additional harmonics to be controlled when compared to the existing family of SHE-based multilevel control for the same converter configuration. The proposed modulation method also shows an interesting feature of fixed switching angles across the entire range of the modulation index, which alleviates the problem of online implementation. The proposed method solely relies on the availability of the variable DC voltage levels, which can be obtained by different topologies. For simplicity, a DC/DC buck converter is utilized in this paper to provide a variable DC voltage levels required by the H-bridges of the five-level converter. The STATCOM system is integrated with a current controller along with a voltage control loop for the buck converter to meet the reactive power demand of different loading conditions. The method is further compared with the conventional carrier-based pulse width modulation (CB-PWM) to show its improved characteristics. The effectiveness and the theoretical analysis of the proposed approach and validated through simulation studies. © 2012 IEEE.

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