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This paper gives an idea to simulation of three-dimensional space vector modulation for neutral point clamped multilevel inverter. Three dimensional-space vector modulation (3D-SVM) algorithm is progressed method of two dimensional-space vector modulation (2D-SVM) algorithm; it leads to reduce the complexity in reference vector identification and switching time calculation, also it includes the various advantages of 2D-SVM like minimized total harmonic distortion, reduced EMI issues. A simple system for the assortment of switching state vectors to track the reference voltage vectors without using any redundant switching vectors. This proposed method tracks the reference vector by identifyinglsubcubes and prisms by using mathematicallconditions. Here the cost of the proposedltechnique is independentlof voltagellevels oflinverter. This paper realizes the accomplishment of 3D-SVM using a neutral point clamped inverter. The simulation results of the proposed method are verified using MATLAB/Simulink.

In this paper, an overview of three-phase inverter topologies for supplying non-symmetrical, non- linear and single phase loads is presented. Today non-symmetrical and non-linear loads dominate in electric power systems. This is even more evident in the isolated systems like uninterruptible power supply, renewable energy sources operating in island mode or auxiliary power supply in railway vehicles. Three-phase inverters therefore must be able to supply three-phase as well as single-phase loads and at the same time not affect the power quality. There are currently three inverter topologies capable of doing this. A special emphasis is given on a three-phase four- leg inverter topology. In addition, two of the most used modulation techniques for three-phase four-leg inverter are described. Mathematical model in abc and dq0 coordinate system is also derived. At the end, the paper outlines some of the existing control design challenges and their solutions.