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자료유형
학술대회자료
저자정보
Bo Guan (Beijing Jiaotong University) Chenchen Wang (Beijing Jiaotong University)
저널정보
전력전자학회 ICPE(ISPE)논문집 ICPE 2015-ECCE Asia
발행연도
2015.6
수록면
2,770 - 2,775 (6page)

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For medium/high voltage high-power neutral-point-clamped (NPC) three-level converters, narrow pulses appear usually when modulation waves are close to ±1 and 0. To ensure reliable switching and the safety, a long narrow pulse limit time needs to be set. Narrow pulse problems will become prominent. Meantime, neutral-point voltage balance problem of three-level NPC converters is a key issue that should be seriously considered. The strong coupling effects between narrow pulse problem and neutral-point voltage balance problem is also worth attention. Ignoring the strong coupling effects, traditional narrow pulse methods realize narrow pulse compensation and neutral-point voltage balance separately. Considering the two problems and the coupling effects, a novel narrow pulse compensation method is proposed. By analyzing the limits of modulation waves caused by narrow pulses, narrow pulses are eliminated completely in this paper. Simulation and experimental results show that it has a good performance for narrow pulse compensation and has few adverse effects on neutral-point voltage balance. The overall performance is better than traditional narrow pulse compensation methods.

목차

Abstract
I. INTRODUCTION
II. THE PRINCIPLE OF THREE-LEVEL CONVERTERS, THE DEFINITION OF NEUTRAL-POINT VOLTAGE BALANCE AND NARROW PULSES
III. THE TRADITIONAL NARROW PULSE COMPENSATION METHODS AND THEIR SHORTCOMINGS
IV. TWO MODIFIED ZERO-SEQUENCE VOLTAGE INJECTION METHODS FOR NARROW PULSE COMPENSATION
V. SIMULATION AND EXPERIMENTS
VI. CONCLUSIONS
REFERENCES

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