군용차량용 로드-암 타입 능동 현수장치의 퍼지 논리 제어Lifetime prediction of DC-link film capacitors using stochastic methods
- Other Titles
- Lifetime prediction of DC-link film capacitors using stochastic methods
- Authors
- 신석산; 함형진; 이형철
- Issue Date
- Nov-2013
- Publisher
- 한국자동차공학회
- Keywords
- DC-link 커패시터; 인버터; 필름 커패시터; 확률 변수 저하 모델; 감마 과정 저하 모델; 모멘트법
- Citation
- 2013 한국자동차공학회 학술대회 및 전시회, pp.792 - 798
- Indexed
- OTHER
- Journal Title
- 2013 한국자동차공학회 학술대회 및 전시회
- Start Page
- 792
- End Page
- 798
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/161401
- Abstract
- In electronic vehicles (EVs) or hybrid electronic vehicles (HEVs), an inverter system has a DC-link capacitor to buffer the high frequency current. A film capacitor has been used as the DC-link capacitor in high level power system. The performance of the film capacitor has deteriorated over operating time. This can be one of critical factors in the EVs and HEVs. For this reason, the lifetime and reliability of the film capacitor are key factors to show the stability of the vehicle inverter system. Therefore, a lot of methods to predict the lifetime of the film capacitor using physical or chemical equations have been researched. However, these researches have a problem about robustness of uncertainty. In this paper, the lifetime and stability of the film capacitor are guaranteed by stochastic methods. A new model combined by random variable deterioration model and gamma process deterioration model to consider natural and sudden loss of the film capacitor is proposed. the parameters of each model are obtained by using curve fitting algorithm and method of moment. Using these models and algorithms, the lifetime of the film capacitor is predicted. Comparing experiment result and the proposed prediction model proves the proposed method has good accuracy.
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