An integrated inverter with maximum power tracking for grid-connected PV systems
An integrated inverter with maximum power tracking for grid-connected PV systems
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DOI：
10.1109/tpel.2005.850906
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发表时间：
2005-07-01
影响因子：
6.7
通讯作者：
Chung, HSH
中科院分区：
文献类型：
--
作者：
Ho, BMT;Chung, HSH
本文提出了一种用于并网光伏系统的逆变器。它可以在广泛的日照范围内全局定位电池板的最大功率点，并将太阳能馈送到电网。其结构主要将先前开发的最大点跟踪方法和输出电流整形功能集成到降压-升压衍生转换器中，然后通过电网频率桥将整形电流逆变到电网。使用串联连接代替与转换器输出并联的存储电容器，因此所需的电容器额定电压低于传统逆变器的额定电压。最重要的是，逆变器输出电流谐波对电容值不太敏感。 30W 实验室原型机已经建成。研究了不同日照下的跟踪能力、反演效率和大信号响应。对逆变器性能进行了详细分析。理论预测得到了实验结果的验证。
An inverter for grid-connected photovoltaic systems is presented in this paper. It can globally locate the maximum power point of the panel over wide insolation and feed the solar energy to the grid. Its structure mainly integrates a previously developed maximum point tracking method and output current shaping function into a buck-boost-derived converter and then inverts the shaped current through a grid frequency bridge to the grid. Instead of having a storage capacitor connecting in parallel with the converter output, series connection is used, so that the required capacitor voltage rating is lower than that in classical inverters. Most importantly, the inverter output current harmonics are less sensitive to the capacitor value. A 30-W laboratory prototype has been built. The tracking capability, inversion efficiency, and large-signal responses at different insolations have been investigated. Detailed analysis on the inverter performance has been performed. The theoretical predictions are verified with the experimental results.