A Space Vector Pulse Width Modulation Technique to Reduce the Effects of Voltage Unbalances
Ashish B Chaudhari1, S. Jebarani Evangeline2
1Ashish B. Chaudhari, EEE Department, Karunya University, Coimbatore, India.
2Ms S. Jebarani Evangeline, EEE Department, Karunya University, Coimbatore, India.
Manuscript received on March 24, 2014. | Revised Manuscript received on April 14, 2014. | Manuscript published on April 30, 2014. | PP: 122-127  | Volume-3, Issue-4, April 2014. | Retrieval Number:  D2912043414/2013©BEIESP

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Abstract: A space vector pulse width modulation (SVPWM) technique is a special technique to determine the switching sequence of the semiconductor switches of the inverter. SVPWM provides more efficient use of the dc bus voltage, in comparison with the direct sinusoidal modulation technique. In this paper, switching pulses for three phase inverter has been carried out by using differentiation of alpha voltage vector. To obtain the phase angle, three phase voltages has to be transformed into voltage vectors alpha and beta using Clark’s transformation. In this paper, voltage vector beta has been carried out by differentiating alpha voltage vector using trigonometric relation between alpha and beta vector. The interaction between two voltage vectors has been reduced, which will give better result compare to conventional SVM method for unbalanced voltage conditions. Different unbalances has been introduced for analysis. MATLAB software has been used for simulation.
Keywords: Three phase Inverter, Space Vector Pulse Width Modulation, Clark’s transformation, Derivation of alpha voltage vector, Voltage unbalances.