NCPE 2016, KLESCET, Belagavi International Journal of Technology and Science, ISSN (Online) 2350-1111, (Print) 2350-1103 Volume 3, Issue 2, 2016 pp. 49-53 www.i3cpublications.org 49 Simulation of Space Vector Modulation in PSIM Vishnu V Bhandankar 1 and Anant J Naik 2 1 Goa College of Engineering Power and Energy Systems Eng., Farmagudi, Goa 403401 Email: vishnu.bhandankar@gmail.com 2 Goa College of Engineering Electrical and Electronics Dept., Farmagudi, Goa 403401 Email: ajn@gec.ac.in Abstract — Space Vector modulation technique was originally developed as vector approach to PWM for Three Phase inverter. Space vector modulation has become one of the most popular and important technique for three phase VSI, Brushless DC motor, switched reluctance motor and permanent magnet motor. It is a more sophisticated technique for generating sine wave that provides a higher voltage to the motor with lower total harmonic distortion. It confines space vectors to be applied according to the region where the output voltage vector is located. In this paper various advantages of Space vector are verified and also a comparison between SVPWM and Sine PWM for three phase 2 level VSI is discussed. Index Terms — Pulse width modulation, Direct current, and space vector PWM and Total harmonic distortion. I. INTRODUCTION SVPWM modulates the command voltage vector as a whole using three phase to two phase transformation. Basically, this algorithm aims to have the average of the output voltage vector equal to the command reference vector [1] .SVPWM is one of the most popular PWM technique for DC to AC conversion for the following reasons:  Wide linear range of operation.  Better DC link utilization.  15%more output voltage than conventional modulations.  Less harmonics content. SVPWM requires very complex on-line computation, which usually limits its operation up to several kHz of switching frequency. The difficulty increases when operation in undermodulation and overmodulation regions is required. In this case, different algorithms are required for each region [1].In this paper method used in [1] to simplify the operation by extending the operation from undermodultion to overmoduation has been used. A Three phase two level VSI with a balanced load has been shown in Fig. 1.Fig. 2 shows various PWM technique often used for 2 level three phase. In Section II operation of SVPWM (Space Vector PWM), Section III operation of Sine PWM, Section IV Simulation and results and in Section V Comparison between Sine and SVPWM has been done. Fig. 1 A 3-phase Voltage Source Inverter (VSI) Fig. 2 Various PWM Techniques for 2 level Three phase VSI II. SPACE VECTOR PWM(SVPWM) The output of two level inverter depends upon the switching state of switches S1-S6 of inverter shown in Fig. 1.The notation used for representing switching state is [Swa,Swb,Swc],Ex. [100] from upper half switch S1 is ON and from lower half S6 and S2 is ON. Considering all the switching states, the total switching states are: 2 3 =8.These switching states or vectors can be classified into 6 unit vector of magnitude 2/3 Vdc and 2 zero vectors .These vectors are represented as V0 [000]-V7 [111].Fig. 3 shows all eight vectors in dq frame. This results into splitting of dq frame into 6 equal sector and the hexagon form the boundary of the Space Vector modulation. Fig. 3 Space Vector modulation The modulation index m can be given as: =     1 (1) Where    is the magnitude of command or reference voltage vector and  1 is the peak value (