OPTIMAL SWITCHING LOSS REDUCTION IN THREE-PHASE VSI USING THRESHOLDED RIDER OPTIMIZATION ALGORITHM

G. Rajeshkumar and P. Sujatha Therese

Keywords

Voltage source inverter, switching losses, modulation index, reference angle, threshold basis

Abstract

This paper intends to develop a variable switching frequency system for switching loss minimization in a three-phase voltage source inverter. Switching losses are associated with the present value in switching instants, device voltage, and the number of commutations. Here, the number of commutations is minimized by varying the switching frequency over the fundamental period. The reduced switching loss is attained by optimizing the modulation index (MI) and reference angle. Thus, optimal switching patterns are generated with the optimized constraints, where the average value of switching losses over an entire period is determined, which has to be reduced. Accordingly, here, the optimization of MI and reference angle is carried out by thresholded rider optimization algorithm, which is the modification of the rider optimization algorithm. Finally, the experimental analysis is carried out for MI and a reference angle with respect to the switching loss parameter and total harmonic distortion.

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