Generalized Scalar PWM Algorithm for VSI Fed Induction Motor Drives with Reduced Complexity


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Abstract


This paper presents a simple and novel generalized pulse width modulation (GPWM)
algorithm for voltage source inverter fed induction motor drives. The classical space vector
approach requires angle and sector information for the calculation of switching times, which
increases the complexity of the PWM algorithm. Hence, to reduce the complexity, the proposed
GPWM algorithm generates the modulating signals by using the instantaneous phase voltages
only. In the proposed algorithm, a unique zero sequence signal is added to the instantaneous
phase voltages in order to generate the modulating waveforms. By varying a constant in the zero
sequence signal from 0 to 1, various PWM algorithms such as space vector PWM (SVPWM) and
discontinuous PWM (DPWM) algorithms are generated. Moreover, a simple overmodulation
algorithm is also presented in this paper. Thus, the proposed GPWM algorithm generates all
possible PWM algorithms in the entire modulation region. To validate the proposed algorithm,
several simulation and experimental results are presented and compared. The results show the
best agreement with the published work.


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Keywords


CPWM, DPWM, GPWM, Harmonic Distortion

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References


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