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Unbalanced DC-Link voltage regulation in a back-to-back 3-level PWM converter for a double-fed induction motor-generator

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3 Author(s)

An unbalanced DC-link voltage regulation strategy is proposed for a three-level voltage source inverter used in the rotor cascade of a double-fed asynchronous motor-generator. The major problem in determining the presence of the unbalanced component is investigated and a solution is proposed using an adaptable filter. This latter is only of a low order and is designed to ensure easy implementation into a (DSP). The regulator is based on the injection of a second order harmonic and its design is presented as well as an investigation of the critical point for correct action of the regulator. Real measurements performed on a low-power test bench after implementation into a DSP validate the accuracy and quality of the filter as well as the control strategy proposed.

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Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 6 )