MISSION PROFILE BASED LIFETIME PREDICTION FOR SINGLE-PHASE BOOST POWER DECOUPLING PHOTOVOLTAIC INVERTER

Zhang Liuchen; Zhang Ya; Mao Meiqin

doi:10.19912/j.0254-0096.tynxb.2020-1100

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (7) : 109-114. DOI: 10.19912/j.0254-0096.tynxb.2020-1100

MISSION PROFILE BASED LIFETIME PREDICTION FOR SINGLE-PHASE BOOST POWER DECOUPLING PHOTOVOLTAIC INVERTER

Zhang Liuchen, Zhang Ya, Mao Meiqin

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Abstract

A method based on mission profile is proposed for predicting the lifetime of the single-phase Boost power decoupling photovoltaic grid-connected inverter. Firstly, the annual solar irradiance and ambient temperature of the installation site are taken as the mission profile, and the junction temperature data of IGBT under different operation conditions are obtained through thermal model simulation by PLECS. Then, the corresponding IGBT junction temperature profile under a yearly mission profile of the installation point is simulated by using the interpolation look-up table method. The lifetime of a single IGBT is predicted by the junction temperature cycle lifetime model. Finally, the distribution function of IGBT’s lifetime is calculated through Monte Carlo method, and the lifetime distribution of the inverter system is predicted by the reliability evaluation block diagram of the series system. The simulation results show that the lifetime distribution of the inverter is no less than 5 years, which meets the ISO9001 quality management system certification.

Key words

lifetime prediction / reliability evaluation / Monte Carlo method / photovoltaic inverter / mission profile / power decoupling

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Zhang Liuchen, Zhang Ya, Mao Meiqin. MISSION PROFILE BASED LIFETIME PREDICTION FOR SINGLE-PHASE BOOST POWER DECOUPLING PHOTOVOLTAIC INVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(7): 109-114 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1100

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