In the existing piecewise fitting methods of photovoltaic array output characteristic curve,since the piecewise points need to be set manually and the fitting precision adjustment is not flexible,a fitting method based on the sliding window algorithm is presented. Also based on this fitting method,a photovoltaic array simulator of BUCK topology is designed. This method can automatically determine piecewise points and give the specific expression of each piecewise function according to the given maximum relative error of fitting and polynomial function forms. The fitting curve is continuous at piecewise points. By analysis of an example and simulation,the validity of this method is proved. The fitting method presented in this paper has a bet⁃ter fitting result than the method of determining piecewise points by experience or observation. Also the photovoltaic array simula⁃tor designed in this paper can simulate the output of a photovoltaic array well,which can replace photovoltaic array used for ex⁃perimental tests of photovoltaic power generation systems or devices.%针对现有光伏阵列输出特性曲线分段拟合方法中分段点需要人工设定，拟合精度调整不灵活等问题，提出一种基于滑动窗口算法的拟合方法，并且基于这种拟合方法，设计一种BUCK拓扑的光伏阵列模拟器。该方法能够根据设定的最大相对拟合误差和多项式函数形式自动确定分段点，并给出每个分段函数的具体表达式，并且拟合曲线在分段点处连续。通过算例和仿真的分析，证明了方法的有效性。结果表明，该合方法比凭经验或观察确定分段点的拟合方法有更好的拟合效果。该光伏阵列模拟器能够很好地模拟光伏阵列的输出，可以替代光伏阵列用于光伏发电系统或者装置的实验测试。
展开▼
