A New Evolutionary Technique Big Bang Big Crunch Optimization

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In previous chapters, the advantages and disadvantages of several modulation methods for multilevel converter have been summarized. In this chapter Fourier series and harmonic elimination theory is discussed briefly to derive the transcendental equations for the fundamental frequency switching method for multilevel inverter. In the second part of this chapter a new evolutionary technique Big Bang-Big Crunch optimization is used for solving the transcendental equations for the fundamental frequency switching method for multilevel inverters.

There are numerous methods which are as follows like (SPWM) First Sinusoidal Pulse Width Modulation, (MCPWM)Second, Multi-Carrier Pulse Width Modulation and (SHE-PWM) and Selective Harmonic Elimination Pulse Width Modulation which are implemented for harmonic elimination specially in multilevel inverter. (MCPWM)Multi-Carrier Pulse Width Modulation strategies are widely used, because they can be easily implemented to low voltage modules. Normally MCPWM can be classified and categorized as Level Shifted PWM (LS-PWM) and Phase Shifted PWM (PS-PWM) methods. (LS-PWM) Level Shifted PWM are characterized into three which are Firstly ,Phase Disposition Technique (PD), secondly ,Phase Opposition Disposition Technique (POD) thirdly Alternative Phase Opposition Disposition Technique (APOD) [45] [46] [47].

For the systems where high switching efficiency is needed, it is required and desirable to keep switching frequency much lower. In this state,

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