Aging Mechanism and Life Estimation of Photovoltaic Inverter DC-link Capacitors in Alternating Humid and Thermal Environment
Article
Article Title | Aging Mechanism and Life Estimation of Photovoltaic Inverter DC-link Capacitors in Alternating Humid and Thermal Environment |
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Article Category | Article |
Authors | Gao, Quanyi, Li, Shuaibing, Cui, Yi, Kang, Yongqiang and Dong, Haiying |
Journal Title | Chinese Journal of Electrical Engineering |
Journal Citation | 10 (1), pp. 48-62 |
Number of Pages | 15 |
Year | 2024 |
Publisher | IEEE (Institute of Electrical and Electronics Engineers) |
Place of Publication | China |
ISSN | 2096-1529 |
Digital Object Identifier (DOI) | https://doi.org/10.23919/CJEE.2024.000054 |
Web Address (URL) | https://ieeexplore.ieee.org/document/10490169 |
Abstract | DC-link capacitors play a vital role in managing ripple voltage and current in converters and various devices. This study focuses on exploring the aging characteristics of DC-link capacitors in alternating humid and thermal environments aligned with the operational conditions in photovoltaic and wind power applications. Adhering to relevant power equipment standards, we designed a 24-h alternating humid and thermal aging environment tailored to the requirements of DC-link capacitors. An aging test platform is established, and 20 widely used metallized polypropylene film capacitors are selected for evaluation. Parameters such as the capacitance, equivalent series resistance (ESR), and phase angle are assessed during aging, as well as the onset time and extent of aging at various intervals. This study focuses on the aging mechanisms, analyzing electrode corrosion, the self-healing process, and dielectric aging. Fitting the aging characteristics enabled us to calculate the lifespan of the capacitor and predict it under different degrees of capacitance decay. The results show that under alternating humid and thermal conditions, capacitance attenuation and ESR increase exhibit exponential nonlinearity, influenced by factors such as the oxidation and self-healing of capacitive metal electrodes, dielectric main-chain fracture, and crystal transformation. This study underscores the pivotal role of encapsulation in determining the aging decay time. |
Keywords | DC-link capacitors; aging mechanism; life prediction; metallized film capacitors |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400803. Electrical energy generation (incl. renewables, excl. photovoltaics) |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Lanzhou Jiaotong University, China |
State Key Laboratory of Large Electric Drive System and Equipment Technology, China | |
School of Engineering |
https://research.usq.edu.au/item/z763v/aging-mechanism-and-life-estimation-of-photovoltaic-inverter-dc-link-capacitors-in-alternating-humid-and-thermal-environment
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