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Figure 1: Matlab/Simulink design flow process for the DTC SVPWM performance is analysed to demonstrate the effectiveness of direct torque control based space vector pulse width modulation technique and strategy for speed and torque control of a three-phase alternating current induction motor. As shown in figure 1, the simulation model of the whole system is built using the Matlab/Simulink software. The whole flow diagram process invokes the corresponding parameters and block diagram and is run by aclosed loop system design. Analysis, creativity and critical thinking takes place during the design and development of the direct torque control based space vector pulse width modu ation of a two level inverter fed three phase alternating current induction motor. Computer simulation results and the who e performance and behavior of the system are examined. The design for the direct torque control based space vector machine is shown in figure 2. pulse width modulation state The speed reference and load torque sets the initial states. The speed controller supplies the necessary flux and torque to the direct torque control space vector pulse width modulation controller which performs complex calculations for the switching frequency to feed the gates of three phase thyristor inverter.

Figure 1 Matlab/Simulink design flow process for the DTC SVPWM performance is analysed to demonstrate the effectiveness of direct torque control based space vector pulse width modulation technique and strategy for speed and torque control of a three-phase alternating current induction motor. As shown in figure 1, the simulation model of the whole system is built using the Matlab/Simulink software. The whole flow diagram process invokes the corresponding parameters and block diagram and is run by aclosed loop system design. Analysis, creativity and critical thinking takes place during the design and development of the direct torque control based space vector pulse width modu ation of a two level inverter fed three phase alternating current induction motor. Computer simulation results and the who e performance and behavior of the system are examined. The design for the direct torque control based space vector machine is shown in figure 2. pulse width modulation state The speed reference and load torque sets the initial states. The speed controller supplies the necessary flux and torque to the direct torque control space vector pulse width modulation controller which performs complex calculations for the switching frequency to feed the gates of three phase thyristor inverter.

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Figure 2: Direct torque control based space vector pulse width modulation inverter fed three phase alternating current induction motor finite state machine design
Figure 2: Direct torque control based space vector pulse width modulation inverter fed three phase alternating current induction motor finite state machine design
perform the simulation from 0 <t < 1.5 seconds and obtain the results. The initial conditions is preloaded to the alternating current induction motor, direct torque control space vector pulse width modulation controller, speed controller, braking chopper, three phase diode rectifier and two level three phase inverter. Scopes is added to obtain the graphical results from the machine terminal current and voltage response. Figure 3: Response of stator current, rotor speed, electromagnetic torque and DC bus voltage versus time
perform the simulation from 0 <t < 1.5 seconds and obtain the results. The initial conditions is preloaded to the alternating current induction motor, direct torque control space vector pulse width modulation controller, speed controller, braking chopper, three phase diode rectifier and two level three phase inverter. Scopes is added to obtain the graphical results from the machine terminal current and voltage response. Figure 3: Response of stator current, rotor speed, electromagnetic torque and DC bus voltage versus time
the load torque. The DC bus voltage have high ripple voltage at a maximum rotor speed condition of 500 rpm and an electromagnetic torque of 792 N.m caused by high speed sector changes and variable switching frequency. The alternating current induction motor then is set to decelerate its speed from 500 rpm to 0 rpm from 1 sec onwards decelerates linearly and very fast from 1 sec to 1.5 sec reducing its rpm speed. The stator current seems to widen wavelength or pulse width and the electromagnetic torque decreases load value stretching from 792 N.m down to 500 N.m from 1 sec to 1.5 sec up to a stable and final value of -792 N.m as it reaches its final state set by load torque reference. The DC bus voltage has some visible transient in preparation to switching into steady state from 1.5 sec to 1.7 sec and becomes stable at 1.7 sec onwards into 640 Vims. The measurement of machine terminal response for the switch voltages and switch currents in six sectors is obtained for the three phase diode rectifier. The measurements of the current and voltage switch are also obtained for the three phase thyristor inverter in six sectors. Three phase voltage response has been added in the measurement both for rectifier and inverter. The voltage switch response of the three phase diode rectifier for Usw1, Usw2, Usw3, Usw4, Usw5 and Usw6 is measured around -640V AC and the starting point is 0V continuously running at a finite time until extemal power supply is shut down. The power diodes respond very fast at switching frequency and hence the pulse width is very slim and not visible. The voltage switch response for six voltage sectors is in figure 4 and figure 5 respectively. Figure 4: Voltage switch response of three phase diode rectifier (Usw1, Usw2 and Usw3)
the load torque. The DC bus voltage have high ripple voltage at a maximum rotor speed condition of 500 rpm and an electromagnetic torque of 792 N.m caused by high speed sector changes and variable switching frequency. The alternating current induction motor then is set to decelerate its speed from 500 rpm to 0 rpm from 1 sec onwards decelerates linearly and very fast from 1 sec to 1.5 sec reducing its rpm speed. The stator current seems to widen wavelength or pulse width and the electromagnetic torque decreases load value stretching from 792 N.m down to 500 N.m from 1 sec to 1.5 sec up to a stable and final value of -792 N.m as it reaches its final state set by load torque reference. The DC bus voltage has some visible transient in preparation to switching into steady state from 1.5 sec to 1.7 sec and becomes stable at 1.7 sec onwards into 640 Vims. The measurement of machine terminal response for the switch voltages and switch currents in six sectors is obtained for the three phase diode rectifier. The measurements of the current and voltage switch are also obtained for the three phase thyristor inverter in six sectors. Three phase voltage response has been added in the measurement both for rectifier and inverter. The voltage switch response of the three phase diode rectifier for Usw1, Usw2, Usw3, Usw4, Usw5 and Usw6 is measured around -640V AC and the starting point is 0V continuously running at a finite time until extemal power supply is shut down. The power diodes respond very fast at switching frequency and hence the pulse width is very slim and not visible. The voltage switch response for six voltage sectors is in figure 4 and figure 5 respectively. Figure 4: Voltage switch response of three phase diode rectifier (Usw1, Usw2 and Usw3)
switching of thyristors as it was fed by direct torque control space vector pulse width modulation controller simulink block Figure 5: V oltage switch response of three phase diode rectifier (Usw4, Usw5 and Usw6)
switching of thyristors as it was fed by direct torque control space vector pulse width modulation controller simulink block Figure 5: V oltage switch response of three phase diode rectifier (Usw4, Usw5 and Usw6)
Figure 6: Combined phase voltage response of three phase diode rectifier (Uab, Ubc, Uca and Udc)
Figure 6: Combined phase voltage response of three phase diode rectifier (Uab, Ubc, Uca and Udc)
Figure 8: Combined voltage switch response of three phase thyristor inverter (Usw1, Usw2 and Usw3) Figure 7: Voltage switch response of three phase thyristor inverter (Usw! Usw2 and Usw3)
Figure 8: Combined voltage switch response of three phase thyristor inverter (Usw1, Usw2 and Usw3) Figure 7: Voltage switch response of three phase thyristor inverter (Usw! Usw2 and Usw3)
Figure 10: Combined voltage switch response of three phase thyristor inverter (Usw4, Usw5 and Usw6) Figure 9: Voltage switch response of three phase thyristor inverter (Usw4, Usw5 and Usw6)
Figure 10: Combined voltage switch response of three phase thyristor inverter (Usw4, Usw5 and Usw6) Figure 9: Voltage switch response of three phase thyristor inverter (Usw4, Usw5 and Usw6)
Figure 11: Phase voltage response of three phase thyristor inverter (Uab, Ubc, Uca and Udc)
Figure 11: Phase voltage response of three phase thyristor inverter (Uab, Ubc, Uca and Udc)
Figure 12: Combined phase voltage response of three phase thyristor inverter (Uab, Ubc, Uca and Udc)
Figure 12: Combined phase voltage response of three phase thyristor inverter (Uab, Ubc, Uca and Udc)
space vector pulse width modulation proceeds to its normal operation. Current switch response for three phase diode Figure 13: Current switch response of three phase rectifier diode (Isw1, Isw2 and Isw3)
space vector pulse width modulation proceeds to its normal operation. Current switch response for three phase diode Figure 13: Current switch response of three phase rectifier diode (Isw1, Isw2 and Isw3)
Figure 14: Combined current switch response of three phase rectifier diode (Isw1, Isw2 and Isw3)
Figure 14: Combined current switch response of three phase rectifier diode (Isw1, Isw2 and Isw3)
Figure 16: Combined current switch response of three phase rectifier diode (Isw4, Isw5 and Isw6) Figure 15: Current switch response of three phase rectifier diode (Isw4, Isw5 and Isw6)
Figure 16: Combined current switch response of three phase rectifier diode (Isw4, Isw5 and Isw6) Figure 15: Current switch response of three phase rectifier diode (Isw4, Isw5 and Isw6)
Institute of Electronics Engineers of the Philippines (IEC EP) Joumal Vol. 1, No. 1, pp. 27 - 36, July 2012. ISSN 2244 - 2146 (Print)
Institute of Electronics Engineers of the Philippines (IEC EP) Joumal Vol. 1, No. 1, pp. 27 - 36, July 2012. ISSN 2244 - 2146 (Print)
Figure 18: Combined current switch response of three phase thyristor inverter (Isw1, Isw2 and Isw3) Figure 17: Current switch response of three phase thyristor inverter (Isw1, Isw2 and Isw3)
Figure 18: Combined current switch response of three phase thyristor inverter (Isw1, Isw2 and Isw3) Figure 17: Current switch response of three phase thyristor inverter (Isw1, Isw2 and Isw3)
there is undesired current distortion as it was caused by abrupt of which high sampling frequency is needed in order for it to
there is undesired current distortion as it was caused by abrupt of which high sampling frequency is needed in order for it to
Figure 19: Current switch response of three phase thyristor inverter (Isw4, Isw5 and Isw6) Institute of Electronics Engineers of the Philippines (IEC EP) Joumal Vol. 1, No. 1, pp. 27 - 36, July 2012. ISSN 2244 - 2146 (Print)
Figure 19: Current switch response of three phase thyristor inverter (Isw4, Isw5 and Isw6) Institute of Electronics Engineers of the Philippines (IEC EP) Joumal Vol. 1, No. 1, pp. 27 - 36, July 2012. ISSN 2244 - 2146 (Print)
Figure 20: Combined current switch response of three phase thyristor inverter (Isw4, Isw5 and Isw6)
Figure 20: Combined current switch response of three phase thyristor inverter (Isw4, Isw5 and Isw6)
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