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Sinusoidal Three-Phase Current Reconstruction and Control Using a DC-Link Current Sensor and a Curve-Fitting Observer

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2 Author(s)
Saritha, B. ; Indian Inst. of Technol. Madras, Chennai ; Janakiraman, P.A.

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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Industrial Electronics, IEEE Transactions on  (Volume:54 ,  Issue: 5 )