• Title/Summary/Keyword: Slip Power Recovery

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A Study on the High Performance Slip Power Recovery System in Induction Motor (유도전동기의 고성능 슬립전력 회수방식에 대한 연구)

  • Park, Han-Ung;Park, Seong-Jin;An, Jin-U;Park, Jin-Gil;Kim, Cheol-U;Hwang, Myeong-Mun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.8
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    • pp.431-439
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    • 1999
  • Among the variable-speed AC motor drive systems, the static slip power recovery system has been widely adopted in large power drives because a high efficiency drive can be obtained by recovering the slip power to the AC line. Although many improvements have been made in this system, several problems also remain such as the need of transformer in inverter AC side, which results in limiting speed control range and increasing the losses, production of reactive power by the control of inverter firing angle, harmonics in line currents, and so on. This paper presents the novel high performance slip power recovery system using the boost converter and small size filter in the rotor circuit, which recovers slip power of a wound rotor induction machine to AC supply efficiently with the aid of the boost converter, in which most of the problems in conventional system can be solved. The speed can be controlled by the duty ratio of the converter switch, not by inverter firing angle. As a results, the proposed system can operate in high power factor and the harmonic currents caused by the inverter and rectifier can be considerably suppressed. The validity of the proposed system verified by demonstrating the good agreement in the simulation and experimental results.

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A New Slip Power Recovery System by Switch Mode Converter (스위치모드 컨버터에 의한 새로운 슬립전력 회수시스템)

  • 박한웅;박성준;김철우;황영문
    • The Transactions of the Korean Institute of Power Electronics
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    • v.4 no.1
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    • pp.73-81
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    • 1999
  • A new slip power recovery system applying a switch mode converter to the rotor circuit of the wound rotor induction machine is proposed and investigated in this paper. With the analysis of the steady-state performances of the proposed system, it can be shown that the speed can be controlled by the duty ratio of the converter switch and the several characteristics of a conventional system can be also improved. In particular, the low power factor and the harmonic components in the line current, which are the main disadvantages of the conventional system, is significantly improved, and linear speed regulation can be obtained. Theoretical and experimental results are presented and illustrated to demonstrate the satisfactory working of the proposed system.

Fuzzy Technique based Chopper Control for Slip Energy Recovery System with Twelve-Pulse Converter

  • Tunyasrirut, S.;Ngamwiwit, J.;Furuya, T.;Yamamoto, Y.
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.509-514
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    • 2004
  • This paper introduces the modified slip energy recovery system in order to improve its power factor and to reduce harmonics of line current waveforms. Twelve pulse line commutated converter with the chopper type IGBT is applied where the chopper is applied across the DC terminal and the chopped DC is fed to the converter operating as an inverter and then passed through the wye-wye and delta-wye transformer circuit. This scheme leads to be able to adjust the speed of the motor by the duty cycle of the chopper operating in PWM mode. The fuzzy logic controller is also introduced to the modified slip energy recovery system for keeping the motor speed to be constant when the load varies. The experimental results in testing the 0.22 kW wound rotor induction motor from no-load condition to rated condition show the effectiveness of the proposed control scheme.

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Slip Power Recovery System by Switch Mode Converter (스위치모드 콘버어터에 의한 슬립전력 회수시스템)

  • Whang, Young-Moon;Choo, Young-Bae;Park, Han-Woong;Kim, Jung-Hong
    • Proceedings of the KIEE Conference
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    • 1997.07a
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    • pp.221-223
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    • 1997
  • This paper deals with the slip power recovery system using switch mode converter in the inverter DC side, which recovers slip power of induction machine to AC line with the aid of the boost converter. As a results, the motor speed can be controlled by the duty ratio of boost switch, not by inverter firing angle. This results that the reactive power produced by phase controlled inverter and diode rectifier can be greatly reduced and linear speed regulation can be obtained. Moreover, the harmonic components of line current caused by the commutation in inverter and rectifier can be considerably suppressed. Therefore, most of the problems in conventional system can be solved.

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Adaptive Control for Speed of Wound Rotor Induction Motor With Slip Energy Recovery

  • Tunyasrirut, Satean;Kanchanatep, Attapol;Ngamwiwit, Jongkol;Furuya, Tadayoshi
    • 제어로봇시스템학회:학술대회논문집
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    • 1998.10a
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    • pp.419-422
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    • 1998
  • This paper presents how to design speed control 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. The problem with speed control by adjusting resistance value in the rotor circuit reduces the efficiency of power, because of the slip energy is lost when it passes through the rotor resistance. The control system is designed to maintain efficiency of motor, where it recovers loss energy by returning it to the system to improve the efficiency. A new PI control method of adaptive control [1],[13]is applied for the system with cascade type PI controller on the main loop to keep the speed constant and the internal loop to adjust the rotor appropriated current of the load provides the good transient response without overshoot.

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A Control Strategy for Flywheel Energy Storage / Recovery System with Induction Machine (유도기를 이용한 플라이휠 에너지 저장 및 재생 시스템 제어 기법)

  • Son Jang-Kyung;Lee Hong-Hee;Nho Eui-Cheol;Kim Heung-Gun;Chun Tae-Won
    • The Transactions of the Korean Institute of Power Electronics
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    • v.10 no.5
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    • pp.494-500
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    • 2005
  • The paper proposed a control strategy for flywheel energy/recovery system with induction machine at the dynamic UPS system using the flywheel stored mechanical energy. The performances for the vector controlled induction generator are compared with those for the induction generator using slip control method. The strategy to improve the transient responses for dc link capacitor voltage is suggested at the transition from the motoring mode to the generating mode. The strategy Proposed by the paper is verified with experiment results using 32bit DSP.

Performance of Double Fed Induction Machine at Sub- and Super-Synchronous Speed in Wind Energy Conversion System

  • Eskander, Mona N.;Saleh, Mahmoud A.;El-Hagry, Mohsen M.T.
    • Journal of Power Electronics
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    • v.9 no.4
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    • pp.575-581
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    • 2009
  • In this paper two modes of operating a wound rotor induction machine as a generator at sub-and super-synchronous speeds in wind energy conversion systems are investigated. In the first mode, known as double fed induction generator (DFIG), the rotor circuit is fed from the ac mains via a controlled rectifier and a forced commutated inverter. Adjusting the applied rotor voltage magnitude and phase leads to machine operation as a generator at sub-synchronous speeds. In the second mode, the machine is operated in a slip recovery scheme where the slip energy is fed back to the ac mains via a rectifier and line commutated inverter. This mode is described as double output induction generator (DOIG) leading to increase the efficiency of the wind-to electrical energy conversion system. Simulated results of both modes are presented. Experimental verification of the simulated results are presented for the DOIG mode of operation, showing larger amount of power captured and better power factor when compared to conventional induction generators.

A study on optimum design and high efficiency operation for commutatorless Kramer type slip power recovery system of induction motor (유도전동기의 무정류자 크레므형 슬립전력회수 시스템의 적정설계 및 고효율화 운전에 관한 연구)

  • 유춘식;홍순일;노창주;이형기
    • Journal of Advanced Marine Engineering and Technology
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    • v.11 no.4
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    • pp.59-74
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    • 1987
  • In this dissertation, a complete model of commutatorless static Kramer type slip power recovery system of 3.phi. induction motor has been designed and tested in the laboratory, and the experimental results are compared with the numerical values. The main results of this study are summerized as follows. (1) Maintenance and repair of the mechanical commutator is obviated by adopting a thyristor commutator in place of the mechanical commutator in the conventional Kramer system. (2) The experimental results of developed torque, and stator current are generally coincided with the numerical values obtained by the derived equation, proving their validity. (3) This system is simulated and the following operational characteristics are obtained with suitable design values : (a) The speed control range of 7:1 is obtained when the turn ratio of induction motor is lowered to about 3:1 to 4:1 and the generating constant of auxiliary synchronous motor is increased to 120-175 range. (b) Its efficiency can be increased to 75-85%, the range for static Scherbius system and its power factor takes values in the range of 65-85%, which is twice of the range for static Scherbius system.

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Fuzzy-Neuro Controller for Speed of Slip Energy Recovery and Active Power Filter Compensator

  • Tunyasrirut, S.;Ngamwiwit, J.;Furuya, T.;Yamamoto, Y.
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.480-480
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    • 2000
  • In this paper, we proposed a fuzzy-neuro controller to control the speed of wound rotor induction motor 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. Recently, the emergence of artificial neural networks has made it conductive to integrate fuzzy controllers and neural models for the development of fuzzy control systems, Fuzzy-neuro controller has been designed by integrating two neural network models with a basic fuzzy logic controller. Using the back propagation 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 difficulty of fine-tuning the scale factors and formulating the correct control rules in a basic fuzzy controller may be reduced using the proposed scheme. The scheme is applied to the control speed of a wound rotor induction motor process. The control system is designed to maintain efficiency of motor and compensate power factor of system. That is: the proposed controller gives the controlled system by keeping the speed constant and the good transient response without overshoot can be obtained.

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