基于扰动观察法的光伏发电系统MPPT控制算法研究

Research of photovoltaic system MPPT control algorithm based on perturbation and observation method

针对传统的扰动观察法在对光伏阵列进行最大功率跟踪时产生的跟踪速度和精度的矛盾,提出一种以固定电压法启动和变步长扰动观察法相结合的跟踪方法,并利用MATLAB对新算法进行仿真。仿真结果表明:该方法可以快速、准确地跟踪最大功率点,尤其在光照突变等条件下可实现光伏电池的最大功率跟踪,并消除系统在最大功率点的振荡。

When max power point tacking（MPPT） is applied to photovoltaic array,there is a speed and precision contradiction in conventional perturbation and observation method.In order to solve the problem,a new track method,combining constant voltage start method and vary step length perturbation and observation method,was presented in this paper,and its algorithm was verified in MATLAB circumstances.The simulation result shows that it can track the MPPT quickly and precisely,especially when the illumination changes abruptly,it can realize MPPT efficiently and eliminate the oscillation around the MPP.