基于ARX模型的局部阴影光伏阵列非机理建模研究

摘要

The existence of partial shadow makes the output characteristic curve of Photovoltaic array presents many peak state, the traditional equivalent model is no longer applicable, and the existing methods to establish the mechanism model of partial shadow photovoltaic array is relatively complex and has a strong nonlinear, which is difficult to adapt to the application of practical engineering. Starting from the simplified model, this paper puts forward a mechanism model of partial shadow photovoltaic array based on ARX model. First of all, after linear interpolation, the output data obtained from the improved mechanism model as the identification data input. Then change the order of ARX model and compare the identification results based on different order number, making the highest accuracy ARX model as the final output. The simulation results proved that the mechanism model has high degree of accuracy and simplification, and satisfies the requirements of experiment simulation of shadow photovoltaic array and engineering application.%局部阴影的存在使得光伏阵列输出特性曲线呈多峰状态，传统的等效模型已不再适用，现有方法建立的机理模型也较为复杂且非线性很强，难以适应于实际工程的应用。从简化模型出发，本文提出基于ARX模型的阴影光伏阵列非机理模型。先将从改进的机理模型中获得的输出数据经线性插值后作为辨识数据输入，再改变ARX模型阶次，比较基于不同阶数的ARX模型的辨识结果，以精确度最高的ARX模型作为最终输出。通过仿真验证，所建非机理模型具有较高的精确度和简化程度，满足阴影光伏阵列实验仿真及工程应用的要求。