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The space vector is a simultaneous representation of all the three-phase quantities. Space vector representation of the three-phase inverter output voltages is introduced next. Thus it follows that the leg voltages will have six distinct and discrete values in one cycle (360°). that one inverter leg's state changes after an interval of 60° and their state remains constant for 60° interval. Leg voThe legge waveform of a three-phase VSI. The power circuit of a three-phase VSI.įigure 2. One of these two is a controllable device and another one is a diode for protection. 1Įach switch in the inverter leg is composed of two back-to-back connected semiconductor devices. The power circuit topology of a three-phase VSI is shown in Fig. THREE-PHASE VSI MODELLING REVIEWĪ mathematical model of three-phase is presented here based on space vector representation. Various simulation results are also included. Finally, a MATLAB/SIMULINK model for the SVPWM is presented. This is followed by the basic principle of SVPWM. Firstly model of a three-phase inverter is presented on the basis of space vector representation.
#Three phase rectifier matlab simulink software#
The reason for the choice of MATLAB/SIMULINK as a development tool is because it is the most important and widely used simulation software and is an integral part of a taught programme in most of the universities in Electrical/Electronics Engineering courses. The main focus of this article is to develop a simple MATLAB/SIMULINK model. This improves the harmonic performance of this method. The major advantage of SVWPM stem from the fact that there is a degree of freedom of space vector placement in a switching cycle. The SVPWM is identified as an alternative method of determination of switching pulse width and their position. Space vector modulation improves dc bus utilization by 15.15%, further digital implementation of this scheme is easier.
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The maximum output voltage from VSI utilizing this scheme is limited to 0.5V dc (peak) or 0.353 rms. The major disadvantage of this scheme is a lower dc bus utilization. The most popular among those are carrier-based sinusoidal PWM and SVPWM. A number of PWM techniques have been presented to obtain variable voltage and frequency supply. Variable voltage and frequency supply for as drives are invariably obtained from a three-phase VSI.