Comparative Analysis of 3-, 5- and 7-Level Inverter Using Space Vector PWM

Abstract— The above concept brings out the method for the multilevel inverters for generation of space vector pulse width modulation (SVPWM) signals. The small triangles formed by the adjacent voltage space vectors are called sectors. Such six sectors around a voltage space vector forms a hexagon called sub hexagon. The space vector diagram of a multilevel inverter can be viewed as composed of a number of such sub hexagons. In the proposed method, we are finding the switching sequence to two level inverter and this can be extended to any number of levels of inverter.new technique (Reverse Mapping) is proposed in this paper, by which these two-level vectors are translated to the switching vectors of the multilevel inverter by adding the center of the sub hexagon to the two-level vectors.. The scheme is explained for a five-level diode clamped inverter, and experimental results are presented for a three-level 5- level and 7-level diode clamped inverter. Multilevel inverters are the one,which can have a specify choice for various power application.Two level inverters waveforms are not smooth as the multi-level inverters. which can from different levels of the voltageDC. The most widely used techniques for implementing the pulse width modulation (PWM) strategy for multilevel inverters are sine-triangle PWM (SPWM) and space vector PWM (SVPWM). In multilevel SPWM, the reference sine wave is compared with a number of level-shifted carriers to decide the switches to be turned on [5]. In the SVPWM scheme, the sampled value of the reference voltage space vector which is the combined effect of the three-phase voltages is realized by switching the nearest voltage space vectors among the inverter voltage vectors. There are different techniques available for implementing SVPWM

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