Abstract
A generalized procedure of decoupled pulse width modulation (DCPWM) based on Method called Direct Torque Control (DTC) for Open Ended Winding Induction motor drive (OEWIM) is anticipated in this paper. This drive topology uses two isolated dc sources with equal magnitudes, feeding two standard two level three-phase inverters. To overcome the complexity in classical space vector pulse width modulation (SVPWM) algorithm, a simple generalized approach is presented in this research by using the phase voltages. With this procedure, various PWM algorithms can be generated by varying a constant value. The dual inverters are operating independently with half of the switching frequency. To show the usefulness of proposed PWM fed DTC drive, simulation results analysis has been carried out by using MATLAB and results obtained.
Highlights
With the development of the Direct Torque Control (DTC) for IM [1-2], these are employed in high performance industrial applications
To continue constant switching frequency, the switching frequency is taken as 3kHz for space vector pulse width modulation (SVPWM) and 4.5kHz for all remaining discontinuous PWM (DPWM) methods [8-11]
A simplified generalized approach is proposed for decoupled PWM based Open Ended Winding Induction motor drive (OEWIM) drive
Summary
With the development of the DTC for IM [1-2], these are employed in high performance industrial applications. To meet high power applications, a variety of multilevel inverter (MLI) topologies such as diode clamped, capacitor clamped, cascaded, etc were projected to the DTC fed drives. These topologies give neutral point oscillations or require much number of sources or capacitors and unbalancing problems. This topology gives the output voltage similar to that of MLI topology and these topologies will be appropriate for high power applications These topologies will reduce the harmonic distortion when compared to two-level. Among the different Pulse width modulation techniques, space vector PWM [7] is popular due to its numerous advantages such as less harmonic distortion, etc, This technique requires complex calculations to generate the switching times. To show the usefulness of the projected approach, numerical simulation results were presented
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