Abstract
Abstract This paper discusses various compensation strategies for shunt active power filters using a generalized theory of instantaneous reactive power. A general instantaneous vector expression for filter current in terms of active and reactive powers has been derived. The general time domain algorithm for filter reference currents in terms of source powers has been given. It is shown that the algorithm works under balanced and unbalanced source voltages while producing a set of balanced three-phase source currents at a desired power factor. Detailed simulation results using matlab have been presented to validate the proposed theory for balanced as well as unbalanced supply voltages.
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