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Simplified SVPWM Algorithm for Neutral Point Clamped 3 Level Inverter Fed DTC IM Drive

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In this paper, a simplified space vector pulse width modulation (SVPWM) method has been developed for three phase three-level voltage source inverter fed to direct torque controlled (DTC) induction motor drive. The space vector diagram of three-level inverter is simplified into two-level inverter. So the selection of switching sequences is done as conventional two-level SVPWM method.Where in conventional direct torque control (CDTC), the stator flux and torque are directly controlled by the selection of optimal switching modes. The selection is made to restrict the flux and torque errors in corresponding hysteresis bands. In spite of its fast torque response, it has more flux, torque and current ripples in steady state. To overcome the ripples in steady state, a space vector based pulse width modulation (SVPWM) methodology is proposed in this paper. The proposed SVPWM method reduces the computational burden and reduces the total harmonic distortion compared with 2-level one and the conventional one also. To strengthen the voice simulation is carried out and the corresponding results are presented.
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  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Simplified SVPWM Algorithm for Neutral Point Clamped 3-level Inverter fed DTC-IM Drive ABSTRACT: In this paper, a simplified space vector pulse width modulati   on (SVPWM) method has been developed for three phase three-level voltage source inverter fed to direct torque controlled (DTC) induction motor drive. The space vector diagram of three-level inverter is simplified into two-level inverter. So the selection of switching sequences is done as conventional two-level SVPWM method.Where in conventional direct torque control (CDTC), the stator flux and torque are directly controlled by the selection of optimal switching modes. The selection is made to restrict the flux and torque errors in corresponding hysteresis bands. In spite of its fast torque response, it has more flux, torque and current ripples in steady state. To overcome the ripples in steady state, a space vector based pulse width modulation (SVPWM) methodology is proposed in this paper. The proposed SVPWM method reduces the computational burden and reduces the total harmonic distortion compared with 2-level one and the conventional one also. To strengthen the voice simulation is carried out and the corresponding results are presented. KEYWORDS: 1.   SVPWM 2.   DTC  SOFTWARE:  MATLAB/SIMULINK  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 BLOCK DIAGRAM:   Fig.1.Block diagram of proposed DTC drive. EXPECTED SIMULATION    RESULTS: Fig 2 steady state plots of speed, torque, stator currents and stator flux for CDTC based IM drive at 1200 rpm.    ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Fig 3 Harmonic Spectrum of stator current along with THD. Fig. 4 Simulation results of 2-level SVPWM based DTC: steady-st   ate plots at 1200 rpm. Fig. 5 Harmonic Spectrum of stator current along with THD for 2-Level SVPWM based DTC-IM drive. Fig. 6 Starting transients in speed, torque, currents and flux for simplified SVPWM algorithm based 3-level inverter fed DTC-IM.  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail:   asokatechnologies@gmail.com ,  Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Fig. 7 Steady state plots of speed, torque, currents and flux for simplified SVPWM algorithm based 3-level   inverter fed DTC-IM. Fig. 8 Harmonic spectra of steady state line current for simplified SVPWM algorithm based 3-level inverter fed DTC-IM. Fig. 9 transients during step change in load for simplified SVPWM algorithm based 3-level inverter fed DTC-IM: a 30 N-m load is applied at 0.5 Fig. 10 Phase and line voltages during a step change in load for simplified SVPWM algorithm based 3-level inverter fed DTC-IM: a 30 N-m load is applied at 0.5 sec.
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