Single-switch voltage equalizer using multi-stacked buck-boost converters for partially-shaded photovoltaic modules
Single-switch voltage equalizer using multi-stacked buck-boost converters for partially-shaded photovoltaic modules
复制标题
用于部分遮蔽光伏模块的使用多堆叠降压-升压转换器的单开关电压均衡器
DOI：
10.1109/tpel.2014.2331456
复制
发表时间：
2015
影响因子：
6.7
通讯作者：
Akio Kukita
中科院分区：
文献类型：
--
作者：
Masatoshi Uno;Akio Kukita
包含多个模块/子串的光伏 (PV) 串的部分遮蔽会引发一些问题，例如发电量显着减少以及出现多个最大功率点 (MPP)（包括全局和本地 MPP），从而阻碍 MPP 跟踪算法。建议使用多层降压升压转换器的单开关电压均衡器来解决部分阴影问题。与需要与光伏模块/子串的数量成比例的多个开关的传统均衡器相比，单开关拓扑可以大大简化电路。所提出的电压均衡器可以通过在传统降压-升压转换器（例如 SEPIC、Zeta 和 Ćuk 转换器）上堆叠电容器-电感器-二极管滤波器来获得。还提出并讨论了均衡器的最佳均衡策略，以有效地补偿部分阴影的光伏组件。针对基于 SEPIC 的拓扑执行基于简化等效电路的操作分析。使用基于 SEPIC 的电压均衡器进行实验均衡测试，模拟由三个子串组成的光伏电池板的部分阴影条件。均衡器消除了局部 MPP，并增加了可提取的最大功率，证明了所提出的电压均衡器的功效。
Partial shading on a photovoltaic (PV) string comprising multiple modules/substrings triggers issues such as a significant reduction in power generation and the occurrence of multiple maximum power points (MPPs), including a global and local MPPs, that encumber MPP tracking algorithms. Single-switch voltage equalizers using multistacked buck–boost converters are proposed to settle the partial shading issues. The single-switch topology can considerably simplify the circuitry compared with conventional equalizers requiring multiple switches in proportion to the number of PV modules/substrings. The proposed voltage equalizers can be derived by stacking capacitor–inductor–diode filters on traditional buck–boost converters, such as SEPIC, Zeta, and Ćuk converters. The optimum equalization strategy is also proposed and discussed for the equalizers to compensate the partially shaded PV modules efficiently. Operational analysis based on a simplified equivalent circuit is performed for a SEPIC-based topology. Experimental equalization tests using the SEPIC-based voltage equalizer were performed emulating partially shaded conditions for a PV panel comprising of three substrings. Local MPPs were eliminated and extractable maximum powers increased by the equalizer, demonstrating the efficacy of the proposed voltage equalizer.