基于改进扰动观察法的光伏系统MPPT研究

MPPT research of photovoltaic system based on improved perturbation and observation method

针对传统扰动观察法追踪速度和稳态精度存在的矛盾,在此基础上进行改进,将恒定电压法、扰动观察法、电导增量法相结合,提出了一种改进算法用于光伏系统的最大功率追踪。首先对P-U曲线及传统扰动观察法工作原理进行了分析,然后阐述了改进算法的工作过程,最后在MATLAB/Simulink中搭建了仿真模型和实验平台进行验证。结果表明,改进算法相比传统算法具有良好的动态性能和稳态性能,既减小了到达最大功率点的时间,又降低了到达最大功率时的震荡。

In view of the contradiction between the tracking speed and the steady-state accuracy of the traditional disturbance and observation method,an improved algorithm was proposed to track the maximum power of photovoltaic system by combining the constant voltage method,disturbance and observation method and conductance increment method.Firstly,the working principle of P-U curve and traditional disturbance and observation method was analyzed,and the working process of the improved algorithm was described.Finally,the simulation model and experimental platform were built in MATLAB/Simulink.The results show that the improved algorithm has better dynamic performance and steady-state performance than the traditional algorithm,which not only reduces the time to reach the maximum power point,but also reduces the vibration when reaching the maximum power.