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이정효(Jung-Hyo Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.3
This paper proposes a interpolation error compensation method for PMSM torque control. In PMSM torque control, two dimensions look-up table(2D-LUT) is used for current reference generation due to its stable and robust torque control performance. However, the stored data in 2D-LUT is discreet, it is impossible to store all over the operation range. To reduce the reference generation error in this region, the 2D-Interpolation method is conventionally used, however, this method still remains the error affected by the number of stored data. Besides, in the case stored by fixed unit, this error is increased in field weakening region because of the small number of stored data. In this paper, analyzing the cause of this interpolation error, and compensating the method to reduce this error. Proposed method is verified by the simulation and experiment.
역기전력 추정기를 이용한 전류 모델 기반의 SPMSM 센서리스 벡터제어
이정효(Jung-Hyo Lee),유재성(Jae-Sung Yu),공태웅(Tae-Woong Kong),이원철(Won-Chul Lee),원충연(Chung-Yuen Won) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The current model based sensorless method has many benefits that it can be robust control for large load torque. However, this method should determine a coefficient of back electro motive force(back-emf). This coefficient is varied by load torque and speed. Also, the coefficient determining equation is not exist, so it is determined only by experiment. On the other hands, using only back-emf estimatior method can not drive in low speed area and it has weakness in load variation. For these problems, this paper suggests the hybrid sensorless method that mixes the back-emf estimator regarding saliency and the current based sensorless model. This estimator offers not only non-necessary coefficient for current sensorless model, but also wide speed area operating in no specific transition method.
DC-link 전압변동을 고려한 PMSM 토크제어의 성능 향상 방법
이정효(Jung-Hyo Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.11
This paper proposes a PMSM torque control method considering DC-link voltage variation and friction torque. In general EV/HEV application, two dimensions look-up table(2D-LUT) is used for reference current generation due to its stable and robust torque control performance. Conventionally, this 2D-LUT is established by flux-torque table to overcome the DC-link voltage variation. However, the flux table establishment is more complex than the speed table establishment. Moreover, one flux data reflects several speed conditions in variable DC-link voltage, friction torque cannot be considered by using the flux table. In this paper, speed-torque 2D-LUT is used for current reference generation. With this table, PMSM torque control is well achieved regardless of DC-link voltage variation by the proposed control method. Simulation and experimental results validate improvement of torque control error through friction torque compensation.
센서리스 제어 기법에 의해 보완된 두 개의 구형파 홀센서를 이용한 PMSM 제어 알고리즘
이정효(Jung-Hyo Lee),이택기(Taek-Ki Lee),김영렬(Young-Ryul Kim),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.5
The PMSM position sensor using two rectangular hall sensors can restrictively acquire the 90[°] position information of rotor according to electrical angle. Thus, the control method using this position sensor cannot react properly to a rapid load torque change. On the other hand, even though a sensorless method has the advantage of acquiring instantaneous rotor position information, the accuracy of position sensor can be determined by the gain value of estimator. This paper suggests a robust speed control method on torque fluctuation condition, which combines low cost two rectangular hall sensors and sensorless control method.
3상 AC-DC 승압형 컨버터를 이용한 SOC 추정 기반의 효율적 배터리 충전 알고리즘
이정효(Jung-Hyo Lee),원충연(Chung-Yuen Won) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.9
This paper presents battery charging method using 3-phase AC-DC boost converter. General battery charging method is that charging the battery voltage to the reference voltage according to the constant current(CC) control, when it reaches the reference voltage, charging the battery fully according to the constant voltage(CV) control. However, battery chaging time is increased because of the battery impedance, constant current charging section which shoud take the large amount of charge is narrow, and constant voltage charging section which can generate insufficient charge is widen. To improve this problem, we proposes the method to reduce the charging time according to the SOC(State of Charge) estimation using battery impedance.
Look-up table 기반 PMSM 제어시 최종 출력 데이터 선형 보간 오차 개선 방법
이정효(Jung-Hyo Lee) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.7
This paper proposes a novel linear interpolation method for improving final output data interpolation error appliable in look-up table based PMSM drive. Conventional linear interpolation method is generally 2D-Interpolation method which has two input parameters. This 2D-Interpolation method uses constant unit torque for reducing DSP processing time, it has a problem when the interpolation process is performed with final torque output, interpolated output can not follow the torque reference. In this paper, a modified conventional interpolation method is proposed to remove torque control error of final torque output data.