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3-레벨 전압형 인버터의 커패시터 수명 연장을 위한 DC-링크 리플 전류 최소화 기법

DC-Link Ripple Current Minimization Method to Extend Capacitor Lifetime in Three-Level Voltage Source Inverters

초록/요약

This thesis presents a DC-link ripple current minimization method to extend the capacitor lifetime in three-level voltage source inverters (3L-VSIs). A DC-link ripple current is defined as the current that flows through the DC-link capacitors. When the space vector pulse width modulation (SVPWM) is adopted as a modulation method of the 3L-VSIs, a large DC-link ripple current is produced when the small vectors are applied. The produced large DC-link ripple current generates high heat losses in the DC-link capacitors, which shortens their lifetime and ultimately reduces the reliability of the 3L-VSIs. To mitigate the problem caused by the large DC-link ripple current, the proposed method substitutes the small vectors of SVPWM with large vectors. As the large vectors induce zero DC-link ripple currents, the minimized DC-link ripple currents and resulting extended lifetime of DC-link capacitors can be attained with the proposed method. In addition, the proposed method guarantees the neutral point voltage balancing, which is essential in the operation of 3L-VSIs. The performance and feasibility of the proposed method are demonstrated by simulation and experimental results.

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목차

제1장 서론 1
제2장 SVPWM 적용에 따른 DC-링크 리플 전류 분석 3
제3장 전해 커패시터의 수명 예측 8
제4장 DC-링크 리플 전류 최소화 기법 10
4.1 전압 벡터 선정 10
4.2 중성점 전압 밸런싱 14
제5장 시뮬레이션 17
5.1 시뮬레이션 회로도 및 파라미터 17
5.2 시뮬레이션 결과 18
제6장 실험 24
6.1 실험 환경 24
6.2 실험 결과 25
제7장 결론 26
참고문헌 27







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