Utility current feedback filter with pulse-width modulated power converter
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United States of America Patent
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Jun 11, 1996
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N/A
app pub date -
Mar 11, 1994
filing date -
Mar 11, 1994
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Abstract
A utility feedback filter for a self-commutated, pulse-width modulated power electronic converter. A feedback node is coupled to detect the utility current which is then utilized in a feedback loop through a feedback circuit. The feedback processed utility current is summed with the requested utility current, and the difference is used to generate a pulse-width modulation pattern. The damping factor can be adjusted by the feedback circuit, which preferably has a transfer function of K.sub.f +K.sub.d, where K.sub.f is a proportional feedback gain and K.sub.d is a derivative feedback gain. Utilization of the actual utility current provides precise control of the current supplied to the utility, which substantially reduces or even eliminates the high frequency harmonic components. Furthermore, by proper choice of the components in the feedback circuit, the resistive value of a damping resistor can be decreased, thereby reducing wasteful dissipation of power.
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