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International Journal of Power System Operation and Energy Management

Abstract

Multilevel inverters are increasingly being used in high power medium voltage applications when compared to two level inverter due to their merits, such as lower common mode voltage, lower dv/dt, lower harmonics in output voltage and current. Among various modulation techniques for a multilevel inverter, space vector pulse width modulation is poplar due to the merits like, it directly uses the control variable given by the control system and identifies each switching vector as a point in complex space. However the implementation of the SVPWM for a multilevel inverter is complicated. The complexity is due to the difficulty in determining the location of the reference vector, the calculations of on times and the determination and selection of switching states. The multilevel SVPWM method uses the concepts of two level modulations to calculate the on times of an n-level inverter. Use of multilevel inverters has become popular for motor drive applications. Various topologies and modulation strategies will be studied from the available literature. This work is devoted to the study and simulation of a new NPC multilevel inverter system typically suitable for high-performance high-power applications. Simulation of this work will be done in MATLAB/Simulink .

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