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PMSM의 DTC-PWM 방식에 의한 고성능 토크 제어
왕혜군(Huijun Wang),이상훈(Sang-Hun Lee),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, an advanced DTC(Direct Torque Control) scheme for PMSM(Permanent Magnet Synchronous Motor) is presented. The proposed DTC method uses a conventional torque estimator and torque error. But the switching signal is generated by PWM method according to the switching rules and torque error. A simple calculation of PMW without any complex determination of space vector can assure the constant switching frequency with an excellent control performance. The proposed torque control scheme for PMSM is verified by computer simulation.
왕혜군(Wang Huijun),이상훈(Sang-Hun Lee),이동희(Dong-Hee Lee),안진우(Jin-Woo Ahn) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
In this paper, a modified multi-level convert for low cost high speed switched reluctance (SR) drive is proposed. The proposed multi-level converter has reduced number of power switches and diodes than that of a conventional asymmetric converter for SRM, and lower voltage rating of the dump capacitor comparing with energy efficient c-dump converter. It can supply five operating modes that is boosted, DC-link, zero, negative bias and negative boosted voltage. The proposed multi-level converter has fast excitation and demagnetization modes of phase current, so dynamic response can be achieved. The proposed multi-level converter is verified by computer simulation and experimental results.
과도 응답 보상기를 가지는 동기발전기의 고성능 여자 제어시스템
이동희,왕혜군,김태형,안진우,Lee, Dong-Hee,Wang, Huijun,Kim, Tae-Hyoung,Ahn, Jin-Woo 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.5
여자제어 시스템의 AVR(Automatic Voltage Regulator) 장치는 발전기의 출력 전압을 일정하게 유지시키기 위하여, 여자기의 전압 또는 전류를 발전기 부하 전류 및 전압 변동에 따라 제어하는 역할을 수행한다. 이러한 AVR 장치의 응답성과 제어 특성은 발전기의 부하 변동 또는 과도 응답 상태에서의 출력 특성을 결정하게 된다. 본 논문에서는 고성능 전동기 제어 시스템에 널리 사용되고 있는 PWM 제어 시스템과 부하 변동에 강인하게 동작할 수 있는 과도 응답 보상기를 적용한 고성능 여자 시스템을 제안한다. 과도 응답 보상기는 발전기의 부하 전류 변동에 따라, 여자기의 제어신호를 PID 제어기의 출력에 더하여 빠른 속응성과 안정성을 가지도록 함으로써, 발전기의 출력 전압을 안정적으로 공급할 수 있도록 제어한다. 제안된 고성능 여자 시스템은 컴퓨터 시뮬레이션과 소형 발전기 시스템에 적용된 실험을 통하여 그 성능을 검증하였다. AVR(Automatic Voltage Regulator) of exciter control system in AC generator controls voltage and current according to load and terminal voltage variations in order to remain at the bus voltage. The output characteristics of main generator is dependent on the control performance of AVR. This paper presents the PWM type exciter system with transient response compensator for robust control of load variations. Additional transient response compensator generates compensation signal for load variation. So the proposed excitation control system has fast dynamic response in transient period and can control terminal voltage constantly. The proposed method is verified by the computer simulation and experimental results in prototype generation system.
새로운 하이브리드 극 구조의 베어링리스 SRM 설계 및 운전특성
李東熙(Dong-Hee Lee),王惠軍(Huijun Wang),安永珠(Young-Joo An),安珍雨(Jin-Woo Ahn) 대한전기학회 2008 전기학회논문지 Vol.57 No.12
Bearingless SRM(Switched Reluctance Motor) is researched for high speed or special applications which can not use mechanical bearing such as bio pump. In this paper, a novel hybrid pole bearing less SRM is presented. The proposed hybrid pole bearing less SRM has salient poles for torque and suspending force production. Motor torque is controlled by the phase currents in torque pole windings, and the suspending force is controlled by suspending currents in four suspending windings for radial direction suspension. Because the proposed bearing less SRM has divided pole structure, mutual effects between torque current and suspending current are very lower than the conventional one's. From this structure, the number of power devices for power converter can be reduced for bearing less SRM driving. The proposed hybrid pole bearing less SRM is verified by the FEM analysis and experimental results.