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Space vector

# Space vector - Application Note Space Vector...

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Application Note: Space Vector Pulse-Width-Modulation For use with Inverters Department of Computer and Electrical Engineering Michigan State University East Lansing, MI Written by: Christopher Roff March 30, 2005 ________________________________________________________________________ Abstract There are numerous methods to create pulse-width-modulation available for use with inverters. Sinusoidal PWM is a widely used method especially in the field of motor control, but with digital applications becoming more widely used, SVPWM has its advantages. Hysteresis is another method but is based on a “guess and check” method of providing PWM to its application. How to derive SVPWM for use with an inverter to control ac drives is a relatively newer alternative and has many advantages over these other methods. Keywords Space vector, PWM, inverter, switching, average voltage vector, sinusoidal PWM.

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Introduction The idea behind SVPWM is to create a rotating space vector that will be used in motor control algorithms for various applications. One method is to create a voltage controlled space vector that will be applied to the stator to provide appropriate currents depending on the application. Space vector PWM is implemented using an inverter to apply the switching times. Objective The method presented here is creating a rotating space vector at constant frequency to be implemented with a three-phase inverter. The inverter will use three pole switching techniques to control the three base voltages making up the desired rotating vector. The switching setup is shown in the figure below. A switch is up if it’s 1 and down if it’s 0. [1]
Procedure Due to the setup of the inverter, various switching times of the three phase voltages (e^j*0, e^j*2pi/3, e^j*4pi*3) must be calculated. The use of real time controls such as RT-Linux would be ideal for calculating these times. Also the use of real time controls greatly enhances the practical application of SVPWM. The method of transmitting switching times to the inverter must be chosen by the user and is not covered in these application notes. Code segments that calculate the switching times

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Space vector - Application Note Space Vector...

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