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引用次数: 3
摘要
为了从太阳能光伏(PV)阵列中提取最大输出，文献中提出了各种最大功率点跟踪(MPPT)算法。在所有的MPPT算法中，最常用的是P&O (Perturb and Observe)算法，因为它简单，易于实现。但是，传统的P&O算法存在一定的局限性。当工作点在最大功率点附近振荡时，其稳态效率较差;当大气条件发生突然变化时，其动态响应较差。此外，对于单相并网光伏系统，直流电压包含二次谐波纹波。这种电压纹波引起PV电压的稳态振荡。为了克服这些局限性，本文提出了一种改进的P& O算法。在任何大气条件的变化下，它都显示出更好的稳态响应和动态响应。在MATLAB/SIMULINK环境下验证了该方案的性能。
A Modified MPPT Algorithm for Single Phase Grid Connected PV System
To extract maximum output from a solar photovoltaic (PV) array, various maximum power point tracking (MPPT) algorithms have been proposed in the literature. Among all the MPPT algorithms, Perturb and Observe (P&O) algorithm is most commonly used because it is simple and easy to implement. But, the conventional P&O algorithm has some limitations. It has poor efficiency at steady state as the operating point oscillates around the maximum power point (MPP) and it shows poor dynamic response if a sudden change in atmospheric condition takes place. Also, for single phase Grid connected PV system, dc-link voltage contains a second harmonic ripple. This voltage ripple causes steady state oscillations in PV voltage. To overcome all these limitations, a modified P& O algorithm has been proposed in this paper. It shows improved steady state response and dynamic response during any change in atmospheric condition. The performance of the proposed scheme is verified using MATLAB/SIMULINK based environment.
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