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낮은 스위칭 주파수로 구동되는 유도전동기의 모델예측토크제어
최유현(Yuhyon Choi),한정호(Jungho Han),송중호(Joongho Song) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.3
When medium and large induction motors are driven by 2-level inverters with low switching frequency, induction motors provoke deteriorated performances resulted from large torque ripples, flux ripples, and large current distortion. Model predictive torque control(MPTC) for a fast torque control of induction motors is also suffered from large torque ripples when the induction motors are fed by 2-level inverters that are based on 6 active voltage vectors with low switching frequency restricted. To solve this problem, this paper proposes a new MPTC method based on both a 12 active voltage vector and an optimized duty ratio calculation. The proposed control strategy illustrates its effectiveness under the various operating conditions through simulation works.
직류링크 전류를 이용한 인터리브드 양방향 컨버터의 상전류 불균형 보상 방법
한정호(Jungho Han),최유현(Yuhyon Choi),송중호(Joongho Song) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.8
This paper presents a compensation method of unbalanced phase currents in interleaved bi-directional converters. Phase currents in interleaved bi-directional converter are apt to be unbalanced due to circuit parameter error and switch operation difference. This problem causes the switch element failure and the reduced efficiency of the converter. Therefore, it is necessary that a certain balance control algorithm is provided in interleaved bi-directional converter system. In this paper, a balance control algorithm based on the circular chain control method is proposed. Further, in order to reduce the number of phase current sensors, this paper shows a simple method in which phase currents can be extracted indirectly through a DC-link current sensor in both charging and discharging modes. The validity and the effectiveness of the proposed phase currents balance control algorithm are illustrated through the simulation results.