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수학적 모델을 기반으로 한 단상 SRM의 고역률 저토크리플 구동방식
양가녕(Jianing Liang),김태형(Tae-Hyoung Kim),이동희(Dong Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This paper presents single-phase SRM drive system with single-stage high power factor and low torque ripple. Single-phase SRM has simple mechanical and electrical structure, robust and high speed operation characteristic. But conventional SRM drive with diode bridge rectifier and filter capacitor has a low power factor because of short charge time of capacitor. Therefore, this paper presents a novel single-phase SRM drive with single-stage structure circuit, which can improve the power factor and reduce peak torque ripple. A novel switching topology is presented base on mathematical analysis. The novel drive method is verified by simulations and experiments.
Series-Parallel Connected Capacitor Type Boost Converter for a Single-Phase SRM
이동희,양가녕,안진우 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.4
An active boost converter for a single phase SRM using series-parallel connected capacitors is proposed in this paper. The proposed active boost converter has two diodes and one power switch with an anti-parallel diode and one additional boost capacitor. The additional boost capacitor could be series or parallel connected to the dc-link capacitor to produce proper excitation and demagnetization voltage. The proposed active boost converter can easily achieve a fast excitation and demagnetization from the capacitor connection. In this paper, series and parallel connected converters are reviewed, and the detailed operating modes as well as the voltage characteristics of the proposed converter are analyzed. The simulation and experimental results shows the effectiveness of the proposed active boost converter.
직접 순시전압 제어기법에 의한 동기발전기의 고성능 여자 제어시스템
이동희,양가녕,이상훈,안진우,Lee, Dong-Hee,Liang, Jianing,Lee, Sang-Hoon,Ahn, Jin-Woo 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.5
본 논문에서는 부하 변동에 강인하고, 제어기의 구성이 매우 간단한 순시전압제어기법을 적용한 여자제어 시스템을 제안한다. 제안하는 순시전압 제어기법은 제어기의 이득을 결정하기 위한 복잡한 설계가 요구되지 않으며, 제어기의 시정수 설정만으로, 전력 변환 장치의 최대 응답성을 유도 할 수 있으며 과도 응답 상태에서 오버슈트의 발생을 크게 억제할 수 있는 장점이 있다. 제안된 순시전압 제어기법에 의한 동기 발전기 여자 시스템은 컴퓨터 시뮬레이션과 소형 발전기 시스템에 적용된 실험을 통하여 그 성능을 검증하였다. This paper presents a simple, robust excitation control system for synchronous generator using direct instantaneous voltage control(DIVC) method DIVC method can operate as maximum dynamics of power conversion system without any control gains such as PID controller. And the transient overshoot of generator voltage can be suppressed with a simple time constant. The proposed control scheme is verified by the computer simulation and experimental results in prototype generation system.
토크리플 억제와 역률개선을 위한 단상 SRM의 구동시스템
安珍雨(Jin-Woo Ahn),梁嘉寧(Jianing Liang) 대한전기학회 2006 전기학회논문지 B Vol.55 No.8
In the single-phase switched reluctance motor (SRM) drive, the required DC source is generally supplied by the circuit consisting of bridge rectifier with diodes and many filter capacitances connected with AC source. Although the peak torque ripple of SRM is small because of large capacity of the capacitance, the charge and discharge time swhich the AC source acts on the capacitance are small and the peak current will pass on the side of source, so power factor and system efficiency decrease. Therefore a novel SRM drive system is presented in this paper, which includes drive circuit realizing reduction of torque ripple and improvement of power factor and switching topology. The proposed drive circuit consists of one switching part and diodes which can separate the output of AC/DC rectifier from the large capacitance and supply power to SRM alternately in order to realize reduction of torque ripple and improvement of power factor through the tum on and tum off of switching part. In addition, the validity of method is tested by simulation and experiment.
단상 SRM의 운전 특성 개선을 위한 새로운 패시브 컨버터
이동희(Dong-Hee Lee),Jianing Liang(梁嘉寧),안진우(Jin-Woo Ahn) 대한전기학회 2009 전기학회논문지 Vol.58 No.8
This paper presents a novel passive converter for single phase SRM. The proposed passive converter has additional passive power circuit which is consisted by three diodes and one capacitor in the front-end of conventional asymmetric converter to supply a high negative bias during demagnetization. The high negative bias can reduce the demagnetization time and negative torque from tail current in single phase SRM. So, It can extend positive torque region by the extended turn-off position. In this paper, the structure and operating modes of a novel passive converter are introduced with mathematical model. The proposed single phase SRM using passive converter is verified by the computer simulation and experimental results.