Abstract

The output voltage of an inverter (output of the LC filter) significantly deviates from the ideal sinusoidal waveshape under sinusoidal unipolar pulse width modulation with a sinusoidal modulating signal. Due to the error between desirable and practical waveshape of the output voltage, the total harmonic distortion deteriorates. To compensate for the distortion, the existing approach requires a lot of computational efforts to correct the pulse width of each gate pulse over an entire fundamental AC period. This paper proposes a simple method to reshape the modulating signal based on the predicted error signal in the rotating frame of reference. The proposed technique is validated experimentally on a DQ-controlled IGBT-based inverter module operating at 500 W, 110 V. The experimental results show an improvement in THD of the output voltage by approximately 5%.

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