中文说明： 数值分析的EULER法，三相光伏逆变并网的仿真，基于分段非线性权重值的Pso算法，通过matlab代码，计算多重分形非趋势波动分析matlab程序,借鉴了主成分分析算法（PCA）。
English Description：
Euler method for numerical analysis, simulation of three-phase photovoltaic grid connected inverter, based on piecewise nonlinear weights of the PSO algorithm, through MATLAB code calculated multifractal detrended fluctuation analysis matlab program, and using the principal component analysis (PCA) algorithm.