Successful operation of three-phase current controllers requires measurement of the instantaneous values of phase currents. An innovative method to estimate the three-phase currents from dc-link current is presented. A sinusoidal curve-fitting observer that does not use any of the load parameters is employed. Using the firing signals and the dc-link current for corrective action, the observer generates stable three-phase feedback signals, even during short periods when the phase current information is not present in the dc-link current.
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Saritha et al. (2007) studied this question.
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