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首页> 外文期刊>Renewable Power Generation, IET >Permanent partial shading detection for protection of photovoltaic panels against hot spotting
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Permanent partial shading detection for protection of photovoltaic panels against hot spotting

机译：永久局部阴影检测，可保护光伏面板免受热斑

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摘要

Hot spot of photovoltaic (PV) panels leads to early degradation and even permanent damage of them. Partial shading is the main cause of hot spotting. Conventional bypass diodes are not able to rectify hot spotting perfectly and more efficient techniques are necessary. In this study, a simple technique is proposed for detection of partial shading and protection of the panels against hot spotting. Moreover, a strategy is used for discrimination between permanent and temporary partial shadings. Equivalent DC impedance of the panel is utilised to detect partial shading. Then, the shaded panel is open circuited using a simple relay to prevent hot spotting. The detection is confirmed or declined by measuring Thevenin impedance of the panel in a reclosing strategy. In the reclosing strategy, the panel is reconnected to the PV system for temporary partial shadings or disconnected from the system for permanent partial shading. The Thevenin impedance is calculated using open circuit voltage and short circuit current of the panel measured by a current sensor and a simple resistive voltage divider. The performance of the proposed method is evaluated using some experiments. The results confirm the performance of the technique for prevention of hot spotting.
机译：光伏（PV）面板的热点会导致面板的早期退化甚至永久性损坏。部分阴影是热点的主要原因。传统的旁路二极管无法完美地纠正热点，因此需要更有效的技术。在这项研究中，提出了一种简单的技术来检测部分阴影并保护面板免受热斑。此外，使用一种策略来区分永久和临时局部阴影。面板的等效直流阻抗用于检测部分阴影。然后，使用简单的继电器将阴影面板开路，以防止热点。通过在重合闸策略中测量面板的戴维宁阻抗，可以确认或拒绝检测。在重合策略中，将面板重新连接到PV系统以进行临时局部遮挡，或者从系统断开以进行永久性局部遮挡。戴维南阻抗使用由电流传感器和简单的电阻分压器测量的面板开路电压和短路电流来计算。通过一些实验评估了该方法的性能。结果证实了用于防止热点的技术的性能。

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