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This paper deals with the effects of unbalanced source voltages on Indirect Matrix Converter (IMC). A detailed theoretical analysis is presented for the harmonic content of input and output currents when unbalanced voltages are applied at IMC input. A control strategy is proposed, where the modulation index of inverter section of IMC is dynamically varied to eliminate the harmonic components of input currents caused due to unbalanced input voltages. A laboratory prototype is developed to verify the effectiveness of the control strategy. Experimental waveforms and harmonic spectrums show excellent agreement between theoretical analysis and simulation results.

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