Resonant Switched-Capacitor Converters for Sub-module Distributed Photovoltaic Power Management
Resonant Switched-Capacitor Converters for Sub-module Distributed Photovoltaic Power Management
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DOI：
10.1109/tpel.2012.2206056
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发表时间：
2013-03
影响因子：
6.7
通讯作者：
J. Stauth;M. Seeman;K. Kesarwani
中科院分区：
文献类型：
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作者：
J. Stauth;M. Seeman;K. Kesarwani
本文讨论了一类用于光伏（PV）能量优化的分布式电源变换器的原理和实现。谐振开关电容器转换器在子模块级与光伏电池串并联配置，以在遮阳或不匹配的情况下改善能量捕获。转换器在并联阶梯结构中工作，在通常连接到旁路二极管的终端上的单元串之间强制执行电压比。通过双芯电缆和连接器，平衡功能从子模块级扩展到整个系列串。并联配置允许转换器只处理不匹配的功率，如果阵列中没有不匹配，则关闭。测量结果表明，当短路电流失配梯度高达40%时，插入损耗低于0.1%，有效转换效率高于99%。该电路实现消除了大功率磁性元件，实现了小于6毫米的垂直占地面积。将谐振拓扑结构的优点与开关电容拓扑结构进行了比较。
This paper discusses the theory and implementation of a class of distributed power converters for photovoltaic (PV) energy optimization. Resonant switched-capacitor converters are configured in parallel with strings of PV cells at the sub-module level to improve energy capture in the event of shading or mismatch. The converters operate in a parallel-ladder architecture, enforcing voltage ratios among strings of cells at terminals normally connected to bypass diodes. The balancing function extends from the sub-module level to the entire series string through a dual-core cable and connector. The parallel configuration allows converters to handle only mismatch power and turn off if there is no mismatch in the array. Measurement results demonstrate insertion loss below 0.1% and effective conversion efficiency above 99% for short-circuit current mismatch gradients up to 40%. The circuit implementation eliminates large power magnetic components, achieving a vertical footprint less than 6 mm. The merits of a resonant topology are compared to a switched-capacitor topology.