Discontinuous PWM Method with Reduced DC-link Ripple Current in Back-to-back Converters
- 주제(키워드) Power Electronics , Back to back , current ripple reduction
- 발행기관 아주대학교
- 지도교수 Kyo-Beum Lee
- 발행년도 2018
- 학위수여년월 2018. 2
- 학위명 석사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000026815
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This paper introduces a novel discontinuous pulse width modulation (DPWM) method to minimize the dc-link ripple current in back-to-back converters. DPWM is used in power converters to curtail the stress on the switching devices, therefore, extending the lifespan. However, as the conventional DPWM is used in a back-to-back topology, the ripple current of the dc-link severely increases during the regions when the power switches are clamped to the dc-bus. Furthermore, the dc-link ripple current reaches the amplitude value when the power switches of both converters are clamped to different dc-link buses. As a result, the life-span of the dc-link capacitor decreases as it endures more stress. To surmount this issue, the reference voltages should be obtained considering the intervals with the increased ripple current of the dc-link. It is achieved by adjusting the zero-sequence component to match the clamping states of both inverters. The efficacy and performance of the proposed method are demonstrated via the PSIM simulation and the experimental results.
more목차
CHAPTER I. INTRODUCTION 1
CHAPTER II. CONTROL METHODS OF THE VSI. 3
2.1 VSI Topology 3
2.2 Conventional PWM Methods 4
CHAPTER III. PROPOSED DPWM METHOD. 8
CHAPTER IV. SIMULATION RESULTS 14
CHAPTER V. EXPERIMENTAL RESULTS 19
CHAPTER VI. CONCLUSION 23
REFERENCES 24
