지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2007.10
- 수록면
- 137 - 142 (6page)
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초록· 키워드
오류제보하기
This paper proposes an overmodulation method for improving the voltage utilization of NPC type 3-level inverter for traction drives.
The conventional railway vehicle has used a vector control to MI=0.907 and a slip-frequency control from MI=0.907 to the six-step mode. The slip-frequency control has less output torque dynamics than the vector control. In this paper, the linear region of NPC type 3-level inverter output voltage is extended to the six-step mode by using overmodulation strategy. As a result, vector control can be adapted in the whole regions and it leads to better output torque dynamics comparing with the conventional slip frequency control in overmodulation region.
The overmodulation range is divided into two modes depending on the modulation index (MI), In the overmodulation region Ⅰ, the reference angles are derived from the Fourier series expansion of the reference voltage corresponds to the MI. In the overmodulation region Ⅱ, the holding angles are also derived in the same way. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.
The conventional railway vehicle has used a vector control to MI=0.907 and a slip-frequency control from MI=0.907 to the six-step mode. The slip-frequency control has less output torque dynamics than the vector control. In this paper, the linear region of NPC type 3-level inverter output voltage is extended to the six-step mode by using overmodulation strategy. As a result, vector control can be adapted in the whole regions and it leads to better output torque dynamics comparing with the conventional slip frequency control in overmodulation region.
The overmodulation range is divided into two modes depending on the modulation index (MI), In the overmodulation region Ⅰ, the reference angles are derived from the Fourier series expansion of the reference voltage corresponds to the MI. In the overmodulation region Ⅱ, the holding angles are also derived in the same way. Therefore, it is possible to obtain the linear control and the maximized utilization of PWM inverter output voltage.
목차
Abstract
Ⅰ. INTRODUCTION
Ⅱ. NPC TYPE 3-LEVEL INVERTER
Ⅲ. OVERMODULATION STRATEGY
Ⅳ. SIMULATION AND EXPERIMENTAL RESULTS
Ⅴ. CONCLUSION
ACKNOWLEDGEMENT
REFERENCES
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