This paper introduces Space Vector Pulse Width Modulation (SVPWM) Technique in detail and its implementation in MATLAB. Performance investigation of Sinusoidal Pulse Width Modulated and Space Vector Modulated Voltage Source Inverter (VSI) fed Induction Motor (1M) drive has done and their simulation results are compared with each other. Also FFT analysis for Sinusoidal Pulse Width Modulated and Space Vector Pulse Width Modulated VSl fed 1M drive is done and compared with each other. 20 HP 1M is used. The study confirms that 1M gives improved performance when it is fed from Space Vector Pulse Width Modulated VS1.
- Space Vector Pulse Width Modulation (SVPWM)
- Sinusoidal Pulse Width Modulation (SPWM)
- Two Level Voltage Source Inverter (VSI)
- Total Harmonic Distortion (THD)
- Three Phase Induction Motor (1M).
Figure 1. Block diagram of SVPWM
EXPECTED SIMULATION RESULTS
Figure 2. (a) Line to Line Voltage (Vab) of Space Vector Modulated VSI (b) Stator current (i,..) of IM (c) Electromagnetic Torque (Te) of IM (d) Rotor Speed (Nm) of 1M.
Figure 3 (a) Line to Line Voltage (Vab) of Sinusoidal Pulse Width Modulated VSI (b) Stator current (i,a) of IM ( c) Electromagnetic Torque (Te) of IM (d) Rotor Speed (Nm) of IM
Figure 4. FFT Analysis of Line to Line Voltage (Vab) of (a) Sinusoidal Pulse Width Modulated VSL (b) Space Vector Modulated VSL
The simulation study of SVPWM technique was presented and compared with SPWM technique. It was found that by using SVPWM technique, THD content present in inverter output voltage is less as compared with SPWM technique. Table III shows that the utilization of DC bus is l3.55% more for SVPWM compared TO SPWM technique. i. e. SVPWM technique achieved a better utilization of DC bus as compared with SPWM technique. The performance investigation of SPWM inverter and SVPWM inverter fed 1M drive was done. Table IV shows, in case of SVPWM increased rotor speed with reduced error band achieved as compared with SPWM. Also settling time is less for SVPWM as compared with SPWM. It was conclude that results for SVPWM technique are more convenient than SPWM technique.
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