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Control system for a current source converter supplying an AC bus

  • US 5,041,959 A
  • Filed: 08/14/1990
  • Issued: 08/20/1991
  • Est. Priority Date: 08/14/1990
  • Status: Expired due to Term
First Claim
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1. A control system for a current source converter for powering a polyphase AC load and having the characteristics of an AC voltage regulator comprising:

  • a) an electrical power converter including both AC terminals and DC terminals, configured to deliver power from a DC current source to an AC load;

    b) a capacitor commonly coupled in parallel with said load to said AC terminals;

    c) a control and gating circuit coupled to the converter for supplying control signals to the converter;

    d) means for furnishing a voltage magnitude reference signal;

    e) means responsive to said voltage magnitude reference signal to develop a command signal representing a reactive current magnitude command;

    f) means for furnishing a polyphase voltage reference signal;

    g) means to sense current in said capacitor and provide a current signal representative thereof;

    h) a calculator responsive to said polyphase voltage reference signal and said current signal to resolve said current signal into signals representing its real and reactive components with respect to said polyphase voltage reference signal; and

    i) a current control loop responsive to said command signal and to said signals representing said real and reactive components to maintain the real component essentially at zero value and the reactive component at a value represented by said command signal.

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