모듈형 멀티레벨 컨버터의 스위칭 손실 저감을 위한 하이브리드 변조 기법
A Hybrid Modulation Method for Switching Losses Reduction in Modular Multilevel Converters
- 주제(키워드) 모듈형 멀티레벨 컨버터 , 스위칭 손실 저감
- 발행기관 아주대학교
- 지도교수 이교범
- 발행년도 2018
- 학위수여년월 2018. 2
- 학위명 석사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000027301
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This paper proposes a novel modulation technique for switching losses reduction in modular multilevel converters (MMCs). The MMC is considered as the development trend topology for medium- and high-voltage applications. However, the MMC requires numerous power devices to generate demanded output quality. Plenty of power devices generate enormous power losses for the system with requiring high cost and a large heat sink for each of the device. For that reason, this paper proposes the hybrid modulation method for the switching losses reduction in the MMC. The proposed modulation scheme combines fundamental-frequency modulation (FFM) scheme and phase-shifted carrier based pulse-width modulation (PS-PWM) scheme. In addition, an additional rotation method is included for voltage-balancing and power distribution among the sub-modules (SMs). Finally, the power losses of three-phase MMC are decreased with retained good output quality of the system. Simulation and experimental results are included to show and verify the performance of proposed hybrid modulation method.
more목차
CHAPTER I. INTRODUCTION 1
CHAPTER II. MODULAR MULTILEVEL CONVERTER 4
2.1 Basic Structure of the MMC 4
2.2 Modeling of the MMC 6
2.3 Conventional PS-PWM Method 8
CHAPTER III. PROPOSED MODULATION METHOD 10
3.1 Principle of the Hybrid Modulation Method 11
3.2 Additional Rotation Method 14
CHAPTER IV. SIMULATIONS 17
4.1 Simulation Results 18
4.2 Switching Losses Analysis 21
CHAPTER V. EXPERIMENTS 23
CHAPTER VI. CONCLUSIONS 28
REFERENCES 29
