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Utility current feedback filter with pulse-width modulated power converter

  • US 5,526,252 A
  • Filed: 03/11/1994
  • Issued: 06/11/1996
  • Est. Priority Date: 03/11/1994
  • Status: Expired due to Term
First Claim
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1. A power flow control apparatus coupled between an AC source of electrical energy and a DC source of electrical energy, said power flow control apparatus comprising:

  • a power electronic converter coupled to the DC source and including a plurality of switches;

    a pulse-width modulation system coupled to the power electronic converter to control said plurality of switches to supply a power flow in accordance with a power flow control waveform responsive to a current reference signal;

    a passive filter coupled between said power electronic converter and said AC source;

    for individual phases of the AC sourcea current feedback sensor positioned at a feedback node between said passive filter and said AC source to supply a feedback signal,a feedback circuit coupled to receive said feedback signal, said feedback circuit processing said feedback signal to supply a processed feedback signal, anda summing circuit coupled to receive said processed feedback signal and the current reference signal, which is applied to said pulse-width modulation system, to produce a summed signal that controls said power electronic converter.

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