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Power line conditioner using cascade multilevel inverters for voltage regulation, reactive power correction, and harmonic filtering

  • US 6,075,350 A
  • Filed: 04/22/1999
  • Issued: 06/13/2000
  • Est. Priority Date: 04/24/1998
  • Status: Expired due to Fees
First Claim
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1. A power line conditioner operative for:

  • detecting a harmonic component in current flowing in an electric power line;

    computing a control voltage for extracting the harmonic component from the current flowing in the electric power line;

    computing a set of triggering phase angles for producing a quasi-square wave approximation of the control voltage;

    receiving a direct-current power source feedback signal representative of a continually obtained fully-charged voltage level in a plurality of direct-current power sources of a cascade multi-level inverter;

    based on the direct-current power source feedback signal, computing a direct-current phase angle offset for continually obtaining a desired fully-charged voltage level in the direct-current power sources;

    driving the cascade multi-level inverter to produce an output voltage corresponding to the quasi-square wave approximation of the control voltage adjusted by the direct-current phase angle offset; and

    supplying the output voltage to the electric power line to substantially extract the harmonic component from the current flowing in the electric power line.

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