研究目的
To assess the lifetime of a micro-inverter for PV applications considering operational conditions and to compare the proposed circuit with an active buffer against the conventional circuit based on a boost chopper.
研究成果
The micro-inverter with an active buffer demonstrates a very long lifetime due to over-designed power devices. The DC-link capacitor in the conventional circuit is identified as the dominant lifetime-limiting component. Future work aims to increase the accuracy of lifetime estimation by considering more factors and performing experimental tests.
研究不足
The study acknowledges the lack of experimental lifetime testing data and reliability models, leading to an evaluation based on thermal performance. The accuracy of lifetime estimation could be improved by considering temperature increments with radiation or including the lifetime of other components such as solder joints.
1：Experimental Design and Method Selection:
The study involves designing a micro-inverter with an active buffer to replace conventional electrolytic capacitors with ceramic capacitors for improved lifetime. The methodology includes theoretical models for lifetime estimation and detailed procedures for evaluating thermal performance under mission profiles.
2：Sample Selection and Data Sources:
The study uses annual mission profiles of ambient temperature and solar irradiance recorded in Arizona to simulate operational conditions.
3：List of Experimental Equipment and Materials:
The micro-inverter consists of a resonant isolated DC/DC converter, an active buffer, and a current source inverter (CSI). All capacitors in the inverter are ceramic.
4：Experimental Procedures and Operational Workflow:
The procedure includes translating mission profiles to thermal loading, applying rainflow cycle counting to junction temperature variations, and using lifetime models for power devices and electrolytic capacitors.
5：Data Analysis Methods:
The analysis involves Monte Carlo simulations with parameter variations to obtain a Probability Density Function (PDF) using a Weibull distribution for a realistic lifetime evaluation.
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