이중 병렬 3-레벨 인버터의 누설 전류 저감을 위한 5-레벨 공간 벡터 변조 기법
Five-Level Space Vector Modulation Method to Reduce Leakage Current of Two-Parallel Three-Level Inverters
- 주제(키워드) 이중 병렬 3-레벨 인버터 , 누설 전류
- 주제(DDC) 621.381
- 발행기관 아주대학교
- 지도교수 이교범
- 발행년도 2023
- 학위수여년월 2023. 2
- 학위명 석사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000032451
- 본문언어 한국어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This thesis proposes an improved five-level space vector modulation (SVM) of two-parallel three-level inverters to reduce leakage current. Two-parallel three-level inverters for higher power capacity are used in several applications, such as photovoltaic, wind power generation, and motor drive systems. The synchronized operation of parallel inverters makes the current distortion on the load side greater. Therefore, several asynchronous operation methods of parallel three-level inverters, such as interleaved modulation or five-level SVM, have been used to improve the current quality. These asynchronous operation methods are accompanied by several problems such as leakage current or zero-sequence circulating current (ZSCC). The five-level reduced common-mode voltage (RCMV) SVM has reduced ZSCC and reduced CMV compared to the interleaved modulation. The five-level RCMV SVM has a high-frequency CMV, and thus, it generates leakage current and problems such as electromagnetic interference and insulation breakdown. In this paper, the five-level reduced leakage current (RLC) SVM suppresses the leakage current by designing the switching sequence that lowers the CMV frequency of the five-level RCMV SVM. The effectiveness and validity of the proposed modulation are verified by simulations and experiments.
more목차
제 1 장 서론 1
제 2 장 병렬 3-레벨 인버터의 5-레벨 공간 벡터 분석 4
2.1 기존의 5-레벨 SVM 4
2.2 5-레벨 RCMV SVM 8
2.3 누설 전류 10
제 3 장 제안하는 5-레벨 RLC SVM 12
3.1 누설 전류 저감을 위한 스위칭 시퀀스 12
3.2 ZSCC를 저감하기 위한 스위칭 분배 법칙 18
제 4 장 시뮬레이션 결과 20
제 5 장 실험 결과 26
제 6 장 결론 29
참고문헌 30
