Cascaded H-bridge 멀티레벨 인버터의 신뢰성 및 출력 품질 향상을 위한 Phase-shifted PWM 기반의 수정된 변조 기법
Modified Modulation Method based on Phase-shifted PWM Scheme for Improving Reliability and Output Performance of Cascaded H-bridge Multilevel Inverter
- 주제(키워드) Cascaded H-bridge 멀티레벨 인버터 , Phase-shifted PWM , 스위칭 손실 저감 변조 기법
- 발행기관 아주대학교
- 지도교수 이교범
- 발행년도 2021
- 학위수여년월 2021. 2
- 학위명 석사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000030594
- 본문언어 한국어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This thesis proposes a modified modulation method based on phase-shifted PWM (PS-PWM) method to improve reliability and output performance for cascaded H-bridge (CHB) multilevel inverter. In generally, the PS-PWM method is one of the popular modulation method because it has a high performance of output. However, this generates the higher switching loss than the other modulation method such as level-shifted PWM (LS-PWM) method. The switching loss leads to major failure mechanism about power semiconductor switch, therefore it should reduce for improving reliability of CHB multilevel inverter. The clamped scheme conducts different switching operation each leg of same cell for reducing switching loss. However, the clamped scheme distributes dwelling time of zero-voltage vector unevenly. This bring about increases THD of output current and decreases output performance of CHB multilevel inverter. To improve output performance, the proposed modulation method is distributed a dwelling time of zero-voltage vector evenly by modifying phase difference of triangular carrier waveforms. Finally, the proposed modulation method is applied the rotation method to distribute even lifetime through distributing power losses evenly. The validity of the proposed modulation method for CHB multilevel inverter is demonstrated by the simulation and experimental results.
more목차
제1장 서론 1
제2장 Cascaded H-Bridge (CHB) 멀티레벨 인버터의 구조 및 변조 기법 4
2.1 CHB 멀티레벨 인버터의 구조 및 동작 원리 4
2.2 Phase-shifted discontinuous PWM (PS-DPWM) 기법 7
2.3 Clamped PS-DPWM (CPS-DPWM) 기법 8
2.4 Even clamped PS-DPWM (ECPS-DPWM) 기법 9
제3장 손실 균등 분배를 위한 로테이션 기법 12
3.1 전류방향을 고려한 로테이션 기법 12
3.2 역률을 고려한 로테이션 기법 15
제4장 시뮬레이션 결과 17
4.1 시뮬레이션 회로도 및 파라미터 17
4.2 EPCS-DPWM 기법 시뮬레이션 결과 19
제5장 실험 결과 24
5.1 실험 세트 24
5.2 실험 결과 26
제6장 결론 31
참고문헌 32
