Thermal modeling of through hole capacitors

IEEE Trans. Power Electron.

2021

The inevitable electro-thermal coupling among capacitors in a bank will lead to non-negligible errors to the temperature as well as the lifetime prediction of the individual capacitor. In this paper, the analytical thermal models with the corresponding design for capacitor banks are proposed considering the thermal coupling effect. Firstly, a measurement based lump thermal model and a physical model-based analytical thermal model are proposed. Then, with the help of the proposed thermal models, the design method for the thermal matching of capacitors in a bank is proposed by optimizing the parameters of individual capacitors, such as the rated parameters and actual loading. To validate the accuracy of the proposed design, case studies based on a capacitor bank with nine capacitors are presented.

Section: Introductionmentioning

confidence: 99%

Analytical Modeling and Design of Capacitor Bank Considering Thermal Coupling Effect

IEEE Trans. Power Electron.

2021

“…The research on thermal stress analysis about capacitor is mainly divided into mathematical models and physical models. In terms of mathematical models, a model for quickly estimating the hot spot temperature of the single capacitor is established in [17]. For applications with multiple capacitors, the thermal stress of the capacitor banks is discussed by establishing a convective and radiative heat transfer model in [18].…”

Section: Introductionmentioning

confidence: 99%

Multitimescale Reliability Evaluation of DC-Link Capacitor Banks in Metro Traction Drive System

Yao

IEEE Trans. Transp. Electrific.

et al. 2020

The reliability of DC-link capacitors in urban rail transit is considered as a major challenge because of significant maintenance impact. In this paper, the DC-link capacitor reliability is researched in metro traction drive system. In the small timescale of control level, the current harmonics of multiple operating conditions and different control methods in the DClink capacitor are discussed. The power loss is simulated by the capacitor harmonics of current and equivalent series resistance (ESR) in multi-operating conditions. Considering electro-thermal coupling, the time-ordered and continuity of thermal stress are analyzed to evaluate the hot spot temperature dynamic conformed to the reality. Combining with the analysis of electrical stress and thermal stress, a multi-timescale capacitor reliability evaluation method is proposed. It is divided into four steps: the discrete small timescale, the single route timescale, the daily operation timescale and the whole lifetime cycle. In the different timescales, the lifetime distribution changes with the dynamics of the complex mission profiles, so as to estimate the lifetime bottleneck of the DC-link capacitor banks with different control methods by the Weibull distribution. In addition, experimental validation is provided to verify the accuracy of the proposed method.

“…From the capacitor end-user perspective, the effort of overcoming the challenges can be divided into three categories which are reviewed in this paper: ①Electrothermal-lifetime modeling to support model-based sizing of capacitors [10][11][12][13][14][15] ; ② Multi-objective optimization of passive capacitor banks in terms of cost, size, efficiency, and reliability [16][17][18][19] ; ③New capacitor concepts based on active switching circuits [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] . The first effort is an analysis tool to predict the reliability performance of the capacitive DC links.…”

Section: Introductionmentioning

confidence: 99%

Capacitive DC links in power electronic systems-reliability and circuit design

Wang²

2018

Chin. J. Electr. Eng.

Capacitive DC links are an important part in voltage source power electronic converters, which contribute to cost, size and failure rate on a considerable scale. With more and more stringent constraints brought by industrial applications, the capacitive DC links encounter reliability aspect challenges. This paper presents a review on the reliability design and improvement of capacitive DC links from three aspects: 1) Quantitative reliability prediction for DC-link capacitors; 2) Reliabilityoriented design of passive DC-link capacitor banks; and 3) Advanced active DC links to exceed the limits of passive DC-link capacitors. Key solutions for each aspect are highlighted and discussed with case studies. This review serves to provide a picture of state-of-the-art research on the reliability design and improvement of capacitive DC links, highlight the key milestones in this area, and identify the corresponding challenges and future research directions.