Performance Investigation of Space Vector Pulse Width Modulated Inverter fed Induction Motor Drive


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.



  1. Space Vector Pulse Width Modulation (SVPWM)
  2. Sinusoidal Pulse Width Modulation (SPWM)
  3. Two Level Voltage Source Inverter (VSI)
  4. Total Harmonic Distortion (THD)
  5. Three Phase Induction Motor (1M).





Figure 1. Block diagram of SVPWM



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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Fuzzy Controller for Three Phases Induction Motor Drives


Because of the low maintenance and robustness induction motors have many applications in the industries. Most of these applications need fast and smart speed control system. This paper introduces a smart speed control system for induction motor using fuzzy logic controller. Induction motor is modeled in synchronous reference frame in terms of dq form. The speed control of induction motor is the main issue achieves maximum torque and efficiency. Two speed control techniques, Scalar Control and Indirect Field Oriented Control are used to compare the performance of the control system with fuzzy logic controller. Indirect field oriented control technique with fuzzy logic controller provides better speed control of induction motor especially with high dynamic disturbances. The model is carried out using Matlab/Simulink computer package. The simulation results show the superiority of the fuzzy logic controller in controlling three-phase induction motor with indirect field oriented control technique.


  1. Vector control
  2. Fuzzy logic
  3. Induction motor drive




Fig. 1. Block diagram of scalar controller for IM.


Fig. 2. Indirect Field Oriented Control of IM.



Fig. 3. Speed response of scalar and vector control


Fig 4. Torque response of scalar and vector control.


Fig. 5. Flux response of scalar control.


Fig. 6. Flux response of vector control.


Fuzzy logic controller shows fast control response with three-phase induction motor. Two different control techniques are used with Fuzzy logic controllers which are scalar and field oriented control techniques. Fuzzy logic controller system shows better response with these two techniques. Meanwhile, the scalar controller has a sluggish response than FOC because of the inherent coupling effect in field and torque components. However, the developed fuzzy logic control with FOC shows fast response, smooth performance, and high dynamic response with speed changing and transient conditions.


 [1] A. Mechernene, M. Zerikat and M. Hachblef, “Fuzzy speed regulation for induction motor associated with field-oriented control”, IJ-STA, volume 2, pp. 804-817, 2008.

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[5] Marino, R., S. Peresada and P. Valigi, “Adaptive input-output linearizing control of induction motors”, IEEE Trans. Autom. Cont., 1993.