• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제3B권2호
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• pp.97-102
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• 2003

In this paper, a recurrent artificial neural network (RNN) based self-tuning speed controller is proposed for the high-performance drives of induction motors. The RNN provides a nonlinear modeling of a motor drive system and could provide the controller with information regarding the load variation system noise, and parameter variation of the induction motor through the on-line estimated weights of the corresponding RNN. Thus, the proposed self-tuning controller can change the gains of the controller according to system conditions. The gain is composed with the weights of the RNN. For the on-line estimation of the RNN weights, an extended Kalman filter (EKF) algorithm is used. A self-tuning controller is designed that is adequate for the speed control of the induction motor The availability of the proposed controller is verified through MATLAB simulations and is compared with the conventional PI controller.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 D
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• pp.2011-2013
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• 2003

The effects of sensor faults on motor variables and control performance in induction motor drives are analyzed by both theoretical approach and simulation study, Vector control and direct torque control method for induction motor are well known. To control speed or position, the informations on rotor speed and rotor or stator flux are required in these control algorithms. The speed is measured by encoder. and the rotor or stator flux is estimated using motor parameters and measured currents. The control input generated based on the information from a faulted sensor should be far from the desired value and deteriorates the overall control performance.

• 전력전자학회논문지
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• 제2권1호
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• pp.39-45
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• 1997

초고속 전동기 구동 시스템을 위하여 간접 신경회로망 제어기를 제안하였다. 고속의 가변 전동기구동에서의 속도응답은 긴 정착시간과 높은 오버슈트의 영향에 있게 되므로 고성능을 위하여 신경회로망 제어기와 신경회로망 에뮬레이터로 구성된 제어기를 사용하였으며, 신경회로망 에뮬레이터는 고속 전동기의 정수와 특성을 동정하는데 사용하였고, 제어기의 학습은 접속강도가 백프로퍼게이션에 의해 조절되도록 하였다. 그리고 시뮬레이션과 실험을 통하여 제안된 시스템의 특성과 장점을 확인하였다.

• 전력전자학회논문지
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• 제7권2호
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• pp.137-148
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• 2002

직접토크제어 기법은 벡터제어계 설계 및 운전시 요구되는 복잡한 좌표변환과 전류제어루프가 불필요하며, 빠른 토크응답을 얻을 수 있기 때문에 벡터제어 기법에 버금가는 유도전동기의 고성능 제어기법으로 인정되고 있다. 본 논문에서는 직접토크제어 기법 적용시 중요한 어려움의 하나로 지적되고 있는 저속영역에서의 자속저하 및 이로 인한 전류고조파의 증가 문제를 해결하기 위한 대책으로서 퍼지 가변 스위칭섹터 기법과 이 기법의 실시간 적용을 위한 실현방법을 제안하였다. 제안된 스위칭섹터 기법을 포함한 유도전동기 제어시스템의 실험적 성능을 고찰하기 위하여 DSP를 이용한 제어보드를 제작하였다. 시뮬레이션과 실험 결과는 제안된 퍼지 가변스위칭 섹터 기법을 도입함으로서 유도전동기 드라이브의 성능이 현저히 개선됨을 보여준다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.451-454
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• 2003

In this paper, the research trend and the sate-of-the-art of low cost motor drives are introduced with the recently increasing interest In various industrial applications, such as home appliance, hybrid electric vehicles, wind power systems, fuel cell systems, and etc. Based on this presented work, it is highly expected the power electronics technologies, which are accumulated through the last 20 years, can be effectively applied to actual application fields.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1999년도 전력전자학술대회 논문집
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• pp.518-521
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• 1999

This paper describes high speed squirrel cage induction motor drives without speed sensors using neural network based on Kalman filter Learning. High speed motors are receiving inverasing attentions in various applications, because of advantages of high speed, small size and light weight with same power level. Larning rate by Kalman filtering is time varying, convergence time fast, effect of initial weight between neurons is small.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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• pp.459-462
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• 1997

This paper presents a optimal PWM patterns, applied to voltage source inverter fed traction motor drives. To derive a PWM patterns of low harmonic characteristic, the analysis and simulations of several PWM techniques are carried out. The acquired PWM patterns can reduce the harmonics and switch the GTOs with low frequency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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• pp.46-48
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• 1997

Induction motor control using for adjustable speed drives has caused secondary effect such as harmonics. Therefore it is considered a various countermeasures to minimize these effects. In this paper, we analyzed the influence of harmonics that is generated by the inverter device for adjustable speed drive of induction motor at the load side.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.535-540
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• 1998

This paper discusses a triple stage current source GTO inverter system for high power motor drives. The energy rebound circuit of the triple stage inverter not only controls the spike voltage of the GTO inverter but also facilitates PWM control of the thyristor rectifier operated at unity fundamental input power factor. Based on Pspice simulation and experiments, the principles and PWM pulse pattern for removing specific lower harmonics in the inverter's output current are discussed in detail.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 전력전자학술대회 논문집
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• pp.10-13
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• 1998

In this paper, a control strategy of the three phase ZVT inverter for ac motor drives is proposed. The topology of ZVT inverter analyzed with a description of the control conditions dependent on the load current and MSVM(Modified Space Vector Modulation). The detailed simulation results indicate that zero-voltage operation during transition of the MSVM algorithm can be achieved.