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Hopf-type Bifurcation in Three-Phase PFC Power Supplies Connected to Non-ideal Power Grid

Meng HuangChi K.TseSiu-Chung Wong

Department of Electronic and Information Engineering, The Hong Kong Polytechnic University

摘要:Three-phase power factor correction (PFC) power supplies are commonly used to convert ac power from a threephase grid to a regulated dc voltage. However, the non-ideal power grid may drive the converter to enter a low-frequency instability region. In this paper, a low-frequency instability phenomenon in three-phase PFC power supplies is reported. The converter can also be regarded as exhibiting a Hopf-type bifurcation in which the dc output voltage oscillates at 150 Hz, and large amount of harmonics appear on the line current. We develop an averaged model of the grid-converter system to predict the low-frequency instability. Additionally, as a result of the emergence of low-frequency oscillation, the stability boundary leading to a catastrophic bifurcation changes dramatically. These phenomena are verified with realistic cycle-by-cycle simulations.
会议名称:

2012 Fifth International Workshop on Chaos-Fractals Theories and Applications

会议时间:

2012-10-18

会议地点:

中国辽宁大连

  • 专辑:

    工程科技Ⅱ辑

  • 专题:

    电力工业

  • 分类号:

    TM46

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