基于静态电压补偿及衰减评估的逆变器能效优化方法

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中图分类号：TM615 文献标志码：A

Abstract： With increasing operation time， photovoltaic （PV） modules undergo aging， leading to reduced power generation capacity and a leftward shift of the operating point. This causes a decrease in the inverter's DC-side input voltage， gradually deviating from the rated voltage. This study explores the feasibility of optimizing PV string power generation efficiency through DC-side voltage compensation. The operating characteristics of PV modules and inverters are theoretically analyzed. Based on this，and combined with previous research on DC microgrid and DC terminal adaptation technologies， a DC voltage compensation device was developed and applied at the input end of the combiner box associated with an inverter in a PV power plant. An inverter efficiency degradation assessment model covering the full power range was used to evaluate efficiency decay over different time periods. Results show that the DC voltage compensation device can effectively supplement the power generation capacity of the PV strings and partially offset eficiency losses caused by equipment degradation and soiling. Significant efficiency improvements were observed under low-load operation.

Keywords： photovoltaic power generation； DC compensation; full-range inverter efficiency assessment; quality and efficiency improvement

维护存量光伏电站、提高电站发电能效是光伏领域的重要课题。（剩余7292字）