| 引用本文: | 蒋 玮,陈 武,胡仁杰,王晓东,杨永标.光伏发电系统中超级电容器充电策略[J].电力自动化设备,2014,34(12): |
| JIANG Wei,CHEN Wu,HU Renjie,WANG Xiaodong,YANG Yongbiao.Charging strategy for super capacitor of photovoltaic generation system[J].Electric Power Automation Equipment,2014,34(12): |
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| 摘要: |
| 利用超级电容器改进型RC模型对不同充电方法下超级电容器的充电效率进行了分析。提出了基于Boost级联Buck变换器（BoCBB）的光伏电池对超级电容器充电系统，前级Boost变换器与光伏发电系统连接，使用改进型扰动观察法进行光伏电池的最大功率点跟踪控制，后级Buck变换器使用分段式充电策略对超级电容器进行充电。基于该电路，提出了完整的超级电容器充电系统控制方法。提出了使用等效电流源分别对BoCBB的前后级电路进行建模的方法，基于该方法进行了充电系统主电路的建模以及电流环控制器设计。最后对不同光照情况下的光伏电池对超级电容器充电效率进行了仿真分析，并搭建了实验平台，通过2组对比实验，验证所提出的充电策略能够有效提高光伏电池对超级电容器的充电效率。 |
| 关键词: 光伏发电系统 超级电容器 储能 级联变换器 充电 效率 光伏电池 最大功率点跟踪 |
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| 基金项目:国家自然科学基金资助项目（51407025）；国家电网公司科技项目（电网与用户双向互动服务能力提升关键技术研究资助）（526408130022）；江苏省科技支撑计划（社会发展）（BE-2013737） |
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| Charging strategy for super capacitor of photovoltaic generation system |
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JIANG Wei1, CHEN Wu1, HU Renjie1, WANG Xiaodong2, YANG Yongbiao3
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1.Jiangsu Provincial Key Laboratory of Smart Grid Technology & Equipment，School of Electrical Engineering，Southeast University，Nanjing 210096，China;2.State Grid Changzhi Electric Power Supply Company，Changzhi 046011，China;3.NARI Technology Co.，Ltd.，Nanjing 211106，China
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| Abstract: |
| The improved RC model of super capacitor is applied in the analysis of its charging efficiency for different charging methods. A super capacitor charging system based on BoCBB（Boost Cascaded Buck converter） is proposed for photovoltaic power generation system and a complete control strategy is designed for it. The Boost converter is connected to photovoltaic system and an improved perturb-observe method is adopted to track the maximum power point. A multi-step charging strategy is adopted to charge the super capacitor by the Buck converter. The concept of equivalent current source is applied in the modeling of BoCBB front and back stages，based on which，the main circuits of charging system are modeled and the controller of current loop is designed. The charging efficiency of photovoltaic cell to super capacitor is simulated for different illumination intensities. A test platform is built and the comparative experiment shows the proposed charging strategy improves the charging efficiency effectively. |
| Key words: photovoltaic generation system super capacitor energy storage cascaded converter charging efficiency photovoltaic cells maximum power point tracking |
