hmodkhalid

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    1. Simulation and comparison of SPWM and SVPWM control for three-phase inverter

      In the SVPWM method, a rotating reference voltage vector is provided as a voltage reference instead of three phase modulated waves. The magnitude and frequency of the fundamental component on the line side are controlled by the magnitude and frequency of the reference vector respectively. The highest peak phase fundamental possible in sine-triangle PWM is very small compared to space vector PWM. Space vector modulation (SVM) technique has become an important PWM technique for three-phase voltage inverters used to control AC induction, brushless DC, switched reluctance and permanent magnet synchronous motors in automotive companies. Studies on space vector modulation techniques have shown that space vector modulation techniques utilize the DC bus voltage more efficiently and produce less harmonic distortion compared to sinusoidal PWM (SPWM) techniques. This paper first establishes a space vector PWM model and simulates the performance with MATLAB/SIMULINK software and its simulation software to compare it with sinusoidal PWM. Simulation studies have shown that space vector PWM uses the DC bus voltage more efficiently and produces less THD compared to sinusoidal PWM

      download times 6 type Paper uploaded 2018-03-22

    2. Modeling, simulation and performance analysis of frequency converters

      The need for variable speed of AC induction motors arises in certain industrial applications which is usually difficult to achieve since the speed of the induction motor is fixed. Available control techniques such as variation of supply voltage, variation of number of poles etc. are characterized by low efficiency and high maintenance cost. Improvements in power electronics through improvements in semiconductor technology to increase reliability and reduce cost of electronic devices have led to the development of modern solid-state electronics. A variable frequency motor drive is an electronic device that is able to control the speed of an induction motor by varying the frequency to increase efficiency, reliability and low maintenance cost. This paper presents the modeling, simulation and performance analysis of such a variable frequency drive using matlab/simulink models. It successfully achieves the control of an induction motor from zero speed to nominal speed by varying the frequency of the applied AC voltage using the pulse width modulation method.

      download times 2 type Technical Documentation uploaded 2018-03-21

    3. Comparative Analysis of Scalar and Vector Control

      This paper presents scalar and vector control of three-phase induction motors. The name scalar control indicates that the magnitude of the controlled variable is varied while neglecting the effects of any coupling in the machine. Scalar control is a very simple method of controlling the speed of an induction motor compared to the more complex vector control. Vector control is based entirely on mathematical equations to control the three-phase torque and speed model of an indirect vector control VSI-fed cage-type asynchronous motor drive through pulse width modulation. Results for both scalar and vector control techniques are included at the end.

      download times 1 type Application Documents uploaded 2018-03-21

    4. SVPWM INVERTER FED permanent magnet brushless DC motor drive

      Frequency converters with pulse width modulation are increasingly being used in many emerging industrial applications for more efficient performance. Recent developments in power electronics and semiconductor technology have led to widespread use of power electronic converters in power electronic systems. Several pulse width modulation (PWM) schemes are used to obtain variable voltage and frequency supply from three-phase voltage source inverters. Among the different PWM techniques proposed for voltage feedback inverters, the sinusoidal PWM technique has been generally accepted. But the trend to use space vector PWM (SVPWM) is increasing because of simpler digital implementation, reduced harmonics, reduced switching losses, and better DC bus utilization. This paper focuses on the progressive development of SVPWM implemented on PMBLDC motors. Simulation results are obtained using MATLAB/Simulink environment to study the effectiveness of the proposed technique.

      download times 0 type Application Documents uploaded 2018-03-21

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