Optimization and Design of a Cascaded DC/DC Converter Devoted to Grid-Connected Photovoltaic Systems
Optimization and Design of a Cascaded DC/DC Converter Devoted to Grid-Connected Photovoltaic Systems
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DOI：
10.1109/tpel.2011.2167159
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发表时间：
2012-04
影响因子：
6.7
通讯作者：
S. Vighetti;J. Ferrieux;Y. Lembeye
中科院分区：
文献类型：
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作者：
S. Vighetti;J. Ferrieux;Y. Lembeye
在建筑物中集成光伏(PV)模块会导致阴影问题，从而极大地减少这些系统产生的能量。此外，大多数光伏组件都是为独立应用而设计的，这些应用的输出电压适用于铅电池。事实上，这种光伏组件的历史规模可以在并网系统的情况下讨论。本文提出了一种基于Boost斩波的级联式DC/DC转换器。首先，我们将展示这种拓扑的优势和局限性。其次，此拓扑将进行优化，以最大限度地提高效率或最大限度地减少容量。这种优化的独到之处在于，变流器的参数和光伏电池的布置都是可变参数。事实上，整个系统都进行了优化。为了实现这些优化，建立了升压斩波器不同部件的损耗和体积的半经验模型。该优化使用连续的二次规划算法。考虑到整个规格范围内的优化结果，提出了一种灵活的解决方案，并给出了实验结果。最后，在典型阴影的不同情况下，对与多个光伏相连的优化拓扑进行了评估。
The integration of photovoltaic (PV) modules in buildings causes problems with shadows that can strongly reduce the energy produced by these systems. Moreover, most PV modules are designed for stand-alone applications that have output voltage adapted to lead batteries. Indeed, this historical sizing of PV modules can be discussed in the case of grid-connected systems. In this paper, a cascaded dc/dc converter based on boost chopper is proposed. First, the advantages and the limits of this topology will be shown. Second, this topology will be optimized to maximize the efficiency or minimize the volume. The originality of this optimization is that the converters' parameters and the arrangement of the PV cells are variable parameters. Indeed, the optimization is done on the entire system. To realize these optimizations, semiempiric models of losses and volumes of different components of a boost chopper were developed. The optimization uses a successive quadratic programming algorithm. Considering the optimization results over the whole range of the specifications, a flexible solution is developed and experimental results are presented. Finally, optimized topologies connected to several PV are evaluated at different situations of typical shadows.