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Speed and power control of a slip energy recovery drive using voltage-source PWM converter with current controlled technique
(2013-01-01)
Tunyasrirut, Satean
;
Kinnaresb, Vijit
This paper introduces the speed and power control a slip energy recovery drive using voltage-source PWM converter with current-controlled technique. The slip energy occurred in the rotor circuit is transferred back to ac mains supply through a reactor and a step up transformer. The objective of the current-controlled technique is to increase power factor of the system and to reduce low order harmonics of the input line current. The drive system is designed and implemented using a voltage source inverter in conjunction with a boost chopper for DC link voltage, instead of a conventional drive using a 6 pulse converter or a Scherbius system. The slip power is recovered by the help of a voltage source inverter (VSI) based on a current-controlled technique. In order to keep the speed of the wound rotor induction motor constant over a certain range of operating conditions, the servo state feedback controller designed by a linear quadratic regulator (LQR) is also introduced and the PI controller designed by pole placement method is also introduced in control the slip power this paper. The overall control system is implemented on DSP, DS1104'TMS32F20control board. A 1 kW wound motor is employed for testing. It is found that the motor speed can be controlled to be constant in the operating range of 600-1200 rpm at no load and full load. It is also found that the harmonics of the input ac line current is reduced while the ac line input power factor is increased. © 2013 The Authors. Published by Elsevier B.V.
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Performance improvement of a slip energy recovery drive system by a voltage-controlled technique
(2010-10-01)
Tunyasrirut, Satean
;
Kinnares, Vijit
;
Ngamwiwit, Jongkol
This paper introduces the performance improvement of a slip energy recovery drive system for the speed control of a wound rotor induction motor by a voltage-controlled technique. The slip energy occurred in the rotor circuit is transferred back to ac mains supply through a reactor instead of a step up transformer. The objective of the voltage-controlled technique is to increase power factor of the system and to reduce low order harmonics of the input line current. The drive system is designed and implemented using a voltage source inverter in conjunction with a boost chopper for DC link voltage, instead of a conventional drive using a 6 pulse converter or a Scherbius system. The slip power is recovered by the help of a voltage source inverter (VSI) based on a space vector pulse width modulation (SVPWM) technique. In order to keep the speed of the wound rotor induction motor constant over a certain range of operating conditions, the servo state feedback controller designed by a linear quadratic regulator (LQR) is also introduced in this paper. The overall control system is implemented on DSP, DS1104'TMS320F240 controller board. The performance improvement of the proposed system is tested in comparison with the conventional Scherbius system and the modified conventional Scherbius system by a 12 pulse converter in conjunction with a chopper at steady state and at dynamic conditions. A 220 W wound motor is employed for testing. It is found that the motor speed can be controlled to be constant in the operating range of 450-1200 rpm at no load and full load. It is also found that the efficiency of the proposed system is remarkably increased since the harmonics of the input ac line current is reduced while the ac line input power factor is increased. © 2010 Elsevier Ltd.
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A DSP-based modified slip energy recovery drive using a 12-pulse converter and shunt chopper for a speed control system of a wound rotor induction motor
(2008-05-01)
Tunyasrirut, Satean
;
Ngamwiwit, Jongkol
;
Kinnares, Vijit
;
Furuya, Tadayoshi
;
Yamamoto, Yoshiichi
This paper introduces a modified slip energy recovery drive system for speed control of a wound rotor induction motor offering improvement of drive performance, particularly line power factor and overall system efficiency. A 12-pulse line commutated thyristor converter operating in an inverter mode in conjunction with an additional IGBT shunt chopper is employed to transfer slip energy back to ac mains supply via three phase transformers. This approach offers motor speed control by varying the duty cycle of the chopper instead of changing the inverter firing angle. As a consequence, supply power factor can be improved. The servo state feedback designed by linear quadratic regulator (LQR) with observer is also included in order to keep motor speed to be constant over a certain range of operating conditions by using the estimated dc link current derived from motor speed. The advantage of this technique is absence of current transducers for current feedback control loop. The overall control system is implemented on DSP, DS1104'TMS320F240 controller board. Experimental results are illustrated in order to validate performance of the proposed system. © 2007 Elsevier B.V. All rights reserved.
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Improvement of slip energy recovery drives with voltage source inverter for a speed control of wound rotor induction motors
(2007-12-01)
Tunyasrirut, Satean
;
Ngamwiwit, Jongkol
;
Kinnares, Vijit
;
Furuya, Tadayoshi
;
Yamamoto, Yoshiichi
This paper introduces the improvement of slip energy recovery drives with voltage source inverter for a speed control of wound rotor induction motors in order to reduce harmonics of input line current waveforms and improve its power factor. A boost chopper is used to connect the diode rectifier to DC link voltage, which is composed of a capacitor and voltage source inverter type space vector pulse width modulation (SVPWM). This scheme leads to be able to adjust the speed of the motor by the duty cycle of the chopper. The PI cascade controller is also introduced to control a speed to be constant when the load varies. An overview of the experimental test bench that the results are presented is three-fold. The first is the harmonics of input line current waveforms are reduced, the second power factor of the drive with VSI are improved and the third presented for a design PI controller for control a speed, where step change loading and unloading transients.
1
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Self-tuning fuzzy logic controller for direct torque control of slip energy recovery system
(2001-12-01)
Tunyasrirut, Satean
;
Ngamwiwit, Jongkol
;
Furuya, Tadayoshi
;
Yamamoto, Yoshiicshi
This paper proposes a design self-tuning fuzzy logic controller to control the slip energy recovery system. The control system is designed to maintain efficiency of motor by keeping the speed constant and the good transient response by using direct torque control. Fuzzy logic controller has been designed by genetic algorithm optimization technique as a means to determine and optimize the fuzzy logic controller design is discussed. In the proposed approach normalization factors and/or membership function parameters and/or the controller policy, are translated into bit-strings. These bit-strings are processed by the genetic algorithm and if the selection process as well as the objective function is chosen properly, a near-optimal solution can be found. To examine the efficiency of the proposed approach, a self-tuning fuzzy logic controller for direct torque control the wound rotor induction motor drive is designed the current in dc link circuit. A particular objective function is chosen to achieve a high dynamic performance. The simulation results demonstrate a significant enhancement in shortening the development time, and improving system performance over a conventional fuzzy logic controller.
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Control of the position dc servo motor by fuzzy logic
(2000-12-01)
Khongkoom, Nalunat
;
Kanchanathep, Attapol
;
Nopnakeepong, Suthichai
;
Tanuthong, Surasak
;
Tunyasrirut, Satean
In this paper, presents fuzzy logic controller is applied for control the position of dc servo motor. The position of the angle location is limited at -π to π radian. Fuzzy inference engine using angle position by angular position sensor, and angular velocity. The dc servo motor revolves the circle of axis at the number of revolutions are corresponding to binding voltage. In the revolved axis, there are the moment of inertia and viscous coefficient of frictions around its axis, it exerts the influence. The angle is detected by rotary encoder, and input as angular information of controlled system to computer. The applied voltage is determined by computer and sent to dc servo motor. The results of experiment on the real plant demonstrate that the proposed fuzzy logic controller is able to sensitiveness to variation of the reference position attention.
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Adaptive fuzzy-neuro controller for speed of wound rotor induction motor with slip energy recovery
(2000-12-01)
Tunyasrirut, Satean
;
Ngamwiwit, Jongkol
;
Furuya, Tadayoshi
;
Yamamoto, Yoshiichi
In this paper, we proposed an adaptive fuzzy-neuro controller to control the speed of wound rotor induction motor with slip energy recovery. An adaptive fuzzy-neuro controller has been designed by integrating two neural network models with a basic fuzzy logic controller. Using the backpropagation algorithm, the first neural network is trained as a plant emulator and the second neural network is used as a compensator for the basic fuzzy controller to improve its performance on-line. The function of the neural network plant emulator is to provide the correct error signal at the output of the neural fuzzy compensator without the need for any mathematical modeling of the plant. The scheme is applied to the control speed of wound rotor induction motor process. The simulation and experimental results show that the adaptive fuzzy-neuro controller gives the controlled system by keeping the speed constant and good transient response without overshoot can be obtained.
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Fuzzy logic control for speed of wound rotor induction motor with slip energy recovery
(1999-12-01)
Tunyasrirut, Satean
;
Kanchanathep, Attapol
;
Ngamwiwit, Jongkol
;
Furuya, Tadayoshi
Fuzzy Logic control is considered for speed of wound rotor induction motors with slip energy recovery. The speed is limited at some range of sub-synchronous speed of the rotating magnetic field. Control speed by adjusting resistance value in the rotor circuit that occurs the efficiency of power are reduced, because of the slip energy is lost when it passes through the rotor resistance. The control system is designed to maintain efficiency of motor. Fuzzy logic control method is applied for self-tuning the system by keeping the speed constant and adjusting the rotor current appropriated to the load. The good transient response without overshoot can be obtained.

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