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| 基于静态电压补偿及衰减评估的逆变器能效优化方法 |
| Research on inverter efficiency optimization method based on static voltage compensation and degradation assessment |
| 投稿时间：2024-05-22 |
| DOI：10.13259/j.cnki.eri.2025.03.005 |
| 中文关键词: 光伏发电|直流补偿|全功率段逆变器效率评估|提质增效 |
| 英文关键词:photovoltaic power generation DC compensation full-range inverter efficiency assessment quality and efficiency improvement |
| 基金项目: |
| 作者 | 单位 | | 王雷 | 上海电力新能源发展有限公司,上海 200010
上海明华电力科技有限公司,上海 200090 | | 邹健 | 上海电力新能源发展有限公司,上海 200010
上海明华电力科技有限公司,上海 200090 | | 徐亦淳 | 上海电力新能源发展有限公司,上海 200010
上海明华电力科技有限公司,上海 200090 | | 霍勇 | 上海电力新能源发展有限公司,上海 200010
上海明华电力科技有限公司,上海 200090 | | 董昕昕 | 上海电力新能源发展有限公司,上海 200010
上海明华电力科技有限公司,上海 200090 | | 薛明华 | 上海电力新能源发展有限公司,上海 200010
上海明华电力科技有限公司,上海 200090 |
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| 中文摘要: |
| 光伏组件随着投运时间增长会发生老化，导致发电能力下降，且工作点左移，使得逆变器直流侧输入电压下降，逐渐偏离额定电压。探讨采用直流侧补偿方式优化光伏组串发电效能的可行性，并对光伏组件和光伏逆变器的工作特性进行了研究。在此基础上，结合前期直流微网和直流末端适配技术研究成果，研制了直流电压补偿装置，并将其应用于某光伏电站逆变器下属汇流箱的输入端。利用全功率段逆变器有功转换效率评估模型评估不同时间周期内逆变器效率衰减情况。结果表明，该直流电压补偿装置能够有效补充光伏组串的发电能力，且在一定程度上抑制了设备性能衰减以及积灰等因素带来的效率降低的影响，使低负载运行下效率提升显著。 |
| 英文摘要: |
| 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 efficiency losses caused by equipment degradation and soiling. Significant efficiency improvements were observed under low-load operation. |
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