Evaluation of Space Vector Switching Patterns Based on Reference Functions and Switching Loss Factor in VSI Fed Induction Motor Drive

摘要

Space vector pulse width modulation (SVPWM) technique has become the most popular and important PWM techniques for three-phase voltage source inverters (VSI) fed control of induction, brushless dc, switched reluctance (SR) and permanent magnet synchronous motors. SVPWM is a method of pre-calculation of switching timing instants for various sections of target output which has options in terms of positioning vectors inside every sampling interval. Even though the basic structure for all SVPWM variants is same, there are more options in the arrangement of the voltage vectors in each sector. Competency of difference SVPWM variants can be understood through their analog equivalencies (reference). This paper presents eight different variations of SVPWM. A comparative evaluation of all these variants in terms of attributes such as switching loss factor (SLF), distortion factor (DF) and total harmonic distortion (THD) in output line voltage is reported. Simulation results are provided to illustrate the analysis.