A novel topology for solving the partial shading problem in photovoltaic power generation system
A novel topology for solving the partial shading problem in photovoltaic power generation system
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DOI：
10.1109/ipemc.2009.5157752
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Qi Zhang-;Xiangdong Sun;Y. Zhong;M. Matsui
中科院分区：
文献类型：
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作者：
Qi Zhang-;Xiangdong Sun;Y. Zhong;M. Matsui
在集中式或串式光伏（PV）系统中，PV模块必须串联连接，以便产生足够高的电压，以避免进一步放大并有效地驱动另外的转换器。这总是需要几十个光伏组件，但其中一些可能会受到树木，云或其他东西造成的部分阴影的影响。在这种情况下，从每个PV模块产生的功率变得不平衡，使得总输出功率大大降低。此外，局部阴影引起的热点效应很可能会损坏光伏电池，影响光伏系统的安全性。为了解决这些问题，本文提出了一种新型的光伏系统拓扑结构，该拓扑结构由多个光伏组件串联而成，每个光伏组件都有相应的能量反馈电路，通过独立的能量反馈电路将光伏系统的输出能量反馈给包括阴影光伏组件在内的相应电路。仿真和实验结果表明，该拓扑结构可以使每个光伏组件单独工作在最大功率点，而不受局部阴影的影响。能量反馈电路不是在无局部阴影的情况下工作的，在这种情况下它们没有功率损耗，因此提高了电路效率。
In centralized or string photovoltaic (PV) systems, PV modules must be connected in series in order to generate a sufficiently high voltage to avoid further amplification and to efficiently drive further converters. This always requires dozens of PV modules, however some of them maybe suffer from partial shadow caused by trees, clouds or other things. In this case, power generated from each PV module becomes unbalanced so that total output powers greatly decrease. Furthermore, hot-spot effect caused by partial shadow is likely to damage the PV cells and affect the security of PV system. In order to solve these problems, a novel topology of PV system composed of many series-connected PV modules with corresponding energy feedback circuits is proposed in this paper, a feedback circuit is independently utilized to feed the output energy of PV system to the corresponding circuit including shadowed PV module. The simulation and experimental results verify that the proposed topology can make each PV module operate on the maximum power point individually regardless of partial shadow. The energy feedback circuits do not operate without partial shadow, they have no power loss under this condition, therefore the circuit efficiency is improved.