RESEARCH ON INFLUENCE OF PHOTOVOLTAIC AND LOAD POWER CHANGE ON JUNCTION TEMPERATURE OF POWER DEVICES IN PHOTOVOLTAIC ENERGY STORAGE CONVERTER

Xie Jiawei; Ying Zhanfeng; Xiong Cheng; Li Deming; Cheng Guo; Wang Ke

doi:10.19912/j.0254-0096.tynxb.2022-0348

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 191-197. DOI: 10.19912/j.0254-0096.tynxb.2022-0348

RESEARCH ON INFLUENCE OF PHOTOVOLTAIC AND LOAD POWER CHANGE ON JUNCTION TEMPERATURE OF POWER DEVICES IN PHOTOVOLTAIC ENERGY STORAGE CONVERTER

Xie Jiawei¹, Ying Zhanfeng¹, Xiong Cheng¹, Li Deming¹, Cheng Guo¹, Wang Ke²

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Abstract

In order to make the operators evaluate the thermal reliability of photovoltaic energy storage system more intuitively and quickly, taking a 2.5 kW small photovoltaic energy storage converter as the object. Based on the equivalent thermal network model, the influence of photovoltaic power and load demand power on the junction temperature of power devices in the converter is studied under the condition of no light curtailment and power limitation. The results show that the junction temperature of the unidirectional DC-DC converter is not affected by the load power, but increases nonlinearly with the increase of photovoltaic power. For bidirectional DC-DC converter, when the energy storage battery discharges, reducing the photovoltaic power and increasing load power will lead to the nonlinear increase of junction temperature. When the energy storage battery is charged, the variation of photovoltaic power and load power under the same conditions will lead to the nonlinear decrease of device junction temperature. The third-order polynomial model above can well describe the low-order nonlinear law of junction temperature variation of the above devices.

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photovoltaic system / power converters / power semiconductor devices / junction temperature / losses / thermal network model

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Xie Jiawei, Ying Zhanfeng, Xiong Cheng, Li Deming, Cheng Guo, Wang Ke. RESEARCH ON INFLUENCE OF PHOTOVOLTAIC AND LOAD POWER CHANGE ON JUNCTION TEMPERATURE OF POWER DEVICES IN PHOTOVOLTAIC ENERGY STORAGE CONVERTER[J]. Acta Energiae Solaris Sinica. 2023, 44(7): 191-197 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0348

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