Implementation of Novel PWM Algorithm for the Reduction of Common Mode Voltage in VSI fed Induction Motor Drives
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Jan 20, 2015
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Abstract
This paper presents a high performance near state PWM (NSPWM) algorithm for the
reduction of common mode voltage (CMV) in direct torque controlled induction motor drives. In
the proposed algorithms, actual switching times are calculated using the concept of imaginary
times. As the proposed method did not use sector identification and angle information, it reduces
the complexity involved in conventional methods. To reduce CMV, in the proposed method active
voltage vectors are used to program the output voltage. NSPWM algorithm utilizes three adjacent
active voltage vectors for the composition of reference voltage vector. As the proposed NSPWM
algorithm is 120 degrees bus-clamping PWM algorithm, it reduces the switching losses of the
inverter by 33.33%. To validate the proposed algorithm, simulation studies have been carried out
using MATLAB-Simulink and results have been presented.
reduction of common mode voltage (CMV) in direct torque controlled induction motor drives. In
the proposed algorithms, actual switching times are calculated using the concept of imaginary
times. As the proposed method did not use sector identification and angle information, it reduces
the complexity involved in conventional methods. To reduce CMV, in the proposed method active
voltage vectors are used to program the output voltage. NSPWM algorithm utilizes three adjacent
active voltage vectors for the composition of reference voltage vector. As the proposed NSPWM
algorithm is 120 degrees bus-clamping PWM algorithm, it reduces the switching losses of the
inverter by 33.33%. To validate the proposed algorithm, simulation studies have been carried out
using MATLAB-Simulink and results have been presented.