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首页> 外文期刊>Journal of power sources >Passive hybridization of a photovoltaic module with lithium-ion battery cells: A model-based analysis
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Passive hybridization of a photovoltaic module with lithium-ion battery cells: A model-based analysis

机译：光伏模块与锂离子电池的被动混合：基于模型的分析

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Standard photovoltaic battery systems based on AC or DC architectures require power electronics and controllers, including inverters, MPP tracker, and battery charger. Here we investigate an alternative system design based on the parallel connection of a photovoltaic module with battery cells without any intermediate voltage conversion. This approach, for which we use the term passive hybridization, is based on matching the solar cell's and battery cell's respective current/voltage behavior. A battery with flat discharge characteristics can allow to pin the solar cell to its maximum power point (MPP) independently of the external power consumption. At the same time, upon battery full charge, voltage increase will drive the solar cell towards zero current and therefore self-prevent battery overcharge. We present a modeling and simulation analysis of passively hybridizing a 5 kWp PV system with a 5 kWh LFP/graphite lithium-ion battery. Dynamic simulations with 1-min time resolution are carried out for three exemplary summer and winter days using historic weather data and a synthetic single-family household consumer profile. The results demonstrate the feasibility of the system. The passive hybrid allows for high self-sufficiencies of 84.6% in summer and 25.3% in winter, which are only slightly lower than those of a standard system. (C) 2017 Elsevier B.V. All rights reserved.
机译：基于交流或直流架构的标准光伏电池系统需要电力电子设备和控制器，包括逆变器，MPP跟踪器和电池充电器。在这里，我们研究了基于光伏模块与电池单元的并联连接而无需任何中间电压转换的替代系统设计。这种方法（我们使用术语“被动杂交”）基于匹配太阳能电池和电池单元各自电流/电压行为的方式。具有平坦放电特性的电池可以独立于外部功耗将太阳能电池固定在最大功率点（MPP）。同时，在电池充满电后，电压升高将驱动太阳能电池趋向于零电流，因此可以自我防止电池过充电。我们介绍了将5 kWp光伏系统与5 kWh LFP /石墨锂离子电池被动混合的建模和仿真分析。使用历史天气数据和综合的单户家庭消费者资料，在三个示例性的夏季和冬季，以1分钟的时间分辨率进行了动态模拟。结果证明了该系统的可行性。被动式混合动力车的夏季自给率很高，冬季自给率达到84.6％，冬季仅达到25.3％，仅略低于标准系统。 （C）2017 Elsevier B.V.保留所有权利。

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