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Method and apparatus for controlling a power converter

  • US 4,994,981 A
  • Filed: 09/30/1988
  • Issued: 02/19/1991
  • Est. Priority Date: 09/30/1988
  • Status: Expired due to Fees
First Claim
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1. A controller for a static power converter connecting an auxiliary power source to an AC power bus operating at a selected AC voltage such that said power converter operates to selectively interchange power between said auxiliary source and said AC power bus, each having internal impedances including an internal resistance and an internal reactance component, said controller acting in response to externally generated commands for real and reactive power interchanges and producing an internal voltage command signal and a phase command signal for controlling said power converter to produce an interchange current having a selected magnitude and phase corresponding to the desired real and reactive power interchanges, said controller comprising in combination:

  • a) first means for generating a signal proportional to said AC voltage of said AC power bus;

    b) second means for generating a sensed real power signal and a sensed reactive power signal indicative of the power being interchanges between said auxiliary power source and said AC power bus as a result of said interchange current;

    c) third means responsive to a real power command and to a reactive power command, said real power signal and said reactive power signal to generate an in-phase current command signal and a quadrature current command signal;

    d) fourth means responsive to said in-phase current command signal, to said quadrature current command signal and to said signal proportional to the AC bus voltage of said AC power bus to generate said internal voltage command signal;

    e) fifth means responsive to said in-phase current command signal, to said quadrature current command signal and to said signal proportional too said AC voltage to generate said phase command signal.

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