Panel-to-Substring Differential Power Processing Converter With Embedded Electrical Diagnosis Capability for Photovoltaic Panels Under Partial Shading
Panel-to-Substring Differential Power Processing Converter With Embedded Electrical Diagnosis Capability for Photovoltaic Panels Under Partial Shading
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DOI：
10.1109/tpel.2021.3064706
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发表时间：
2021-09
影响因子：
6.7
通讯作者：
M. Uno;Kazuma Honda
中科院分区：
文献类型：
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作者：
M. Uno;Kazuma Honda
已经开发了各种类型的差分功率处理（DPP）转换器，以通过排除部分遮蔽问题（诸如发电量的减少和多个最大功率点的出现）来提高部分遮蔽光伏（PV）面板的能量产量。同时，光伏系统需要故障诊断工具来检测导致整个系统发电量减少的过早劣化和故障，以及在最坏的情况下，危险情况，如火灾。本文提出了一种新型的DPP转换器以及使用DPP转换器的电气诊断技术。所提出的DPP转换器不仅解决了部分阴影问题，而且还提供了电气诊断能力。在诊断模式中，DPP转换器向面板注入交流电流，并且可以根据对注入的交流电流的电压响应来计算面板的交流阻抗。利用样机进行了详细的运行分析和实验验证测试。结果表明，提高了部分遮蔽的光伏电池板的发电量和建议的DPP转换器的电气诊断能力。
Various kinds of differential power processing (DPP) converters have been developed to improve the energy yield of partially-shaded photovoltaic (PV) panels by precluding partial shading issues, such as the reduction in power generation and the occurrence of multiple maximum power points. Meanwhile, PV systems require fault diagnosis tools to detect premature deterioration and malfunctions that lead to a reduction in power generation of the system as a whole and, in the worst case, hazardous situations, such as a fire. This article proposes a novel DPP converter as well as an electrical diagnosis technique using the DPP converter. The proposed DPP converter not only addresses the partial shading issues but also provides the electrical diagnosis capability. In the diagnosis mode, the DPP converter injects ac currents to a panel, and an ac impedance of the panel can be calculated from the voltage response to the injected ac currents. The detailed operation analysis and experimental verification tests using a prototype were performed. The results demonstrated the improved power yield from partially shaded PV panels and the electrical diagnosis capability of the proposed DPP converter.