Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1995-06-27
1997-01-14
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307105, H02M 112
Patent
active
055946305
ABSTRACT:
An add-on distortion scrubber for use in an AC power generation system comprises an parallel connected inverter having a first DC link capacitor coupled in parallel, and a series connected inductive tie impedance. The inverter produces an output voltage having controllable magnitude, phase, and frequency components and operates by sensing the AC voltage waveform of the AC power generation system and controlling its output magnitude, phase, and frequency to fundamentally match the AC voltage waveform. In this way, the inverter appears as a virtual no-load to the AC power generation system while removing the harmonics therefrom. Alternatively, the scrubber inverter may be configured as a dedicated load filter by coupling it to the power input of the load. The scrubber inverter senses the total power delivered to the load/scrubber combination and generates an appropriate waveform to cancel the harmonics generated by the load. In a further embodiment, with a controlled relationship of the inductive tie impedance, the add-on distortion scrubber is utilized with a main power inverter operating in a full square wave mode to produce a sinusoidal output. The output of the main power inverter is coupled through an output inductance and a parallel filter capacitor to a parallel connected inductive tie impedance of the add-on distortion scrubber. The scrubber inverter compensates for the harmonics generated by the main inverter and provides a clean output without heavy filter components.
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Berhane Adolf
Makeever Jeffery J.
Nguyen Matthew V.
Sundstrand Corporation
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