Control of parallel multirectifiers for a direct-drive permanent-magnet wind power generator

Zhuang Xu, Rui Li, Dianguo Xu

    Research output: Journal PublicationArticlepeer-review

    16 Citations (Scopus)


    This paper presents control strategies for a multimegawatt direct-drive permanent-magnet wind power generator with parallel-operating rectifiers linked by common dc bus. A model of a number of n rectifiers in parallel with a common dc link and zero-sequence current dynamics are derived and analyzed. The parallel-operating control is designed to restrain currents that flow between the power modules caused by power-device discrepancy and asynchronous operation of the parallel units. The multiple sets of pulse width modulation driving signals are generated by individual current control and produced by carrier phase-shifting synchronously. Each converter module is independent of each other identifying the rotor position by using an observer. The currents of each module are balanced and synchronized with respect to each other producing the optimal total generator torque. The experimental results that were obtained on a 1.5-MW platform proved the effectiveness of the control strategies.

    Original languageEnglish
    Article number6502690
    Pages (from-to)1687-1696
    Number of pages10
    JournalIEEE Transactions on Industry Applications
    Issue number4
    Publication statusPublished - 2013


    • Common dc link
    • parallel operating
    • permanent-magnet generator
    • wind power
    • zero-sequence currents

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Industrial and Manufacturing Engineering
    • Electrical and Electronic Engineering


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