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논문 기본 정보

자료유형
학술대회자료
저자정보
Xiaonan Gao (Technical University of Munich) Wei Tian (Technical University of Munich) Zhenbin Zhang (Shandong University) Ralph Kennel (Technical University of Munich)
저널정보
전력전자학회 ICPE(ISPE)논문집 ICPE 2019-ECCE Asia
발행연도
2019.5
수록면
160 - 165 (6page)

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초록· 키워드

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Modular multilevel converters (MMCs) have become an attractive topology for medium-voltage motor drive applications due to their modular construction and voltage scalability. The main drawback of using MMC to drive motors is the large voltage variation of submodule (SM) capacitors when the motor is running at a low speed with a large load torque condition. Operating in the quasi two-level mode of MMCs is an effective solution for such a problem. The arm current commutation control is the most important part for the operation of MMCs in the quasi two-level mode. This paper proposes a new current commutation method. The general idea is to use the delay control method to realize the arm current commutation. Therefore, the key point is to decide when to delay the operation of a submodule at each step during the commutation process. In this paper, the model predictive control (MPC) method with extrapolation technique has been used to determine whether to delay the SM at the present moment. Therefore, the waveforms of the two arms in the same phase may not be completely complementary throughout the whole commutation period. Due to such non-complementary PWMs, the currents between two arms can be exchanged.

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Abstract
I. INTRODUCTION
II. QUASI TWO-LEVEL OPERATION
III. CONTROL SCHEME FOR MMC IN THE QUASI TWOLEVEL OPERATION MODE
IV. PROPOSED CONTROL METHOD
V. SIMULATION RESULTS
VI. CONCLUSION
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