基于自适应占空比扰动算法的光伏发电系统MPPT控制

Maximum Power Point Tracking Control of PV Power Generation System Based on Adaptive Duty Cycle Perturbation Algorithm

常规的扰动观察法在光伏阵列的最大功率点跟踪中应用广泛,算法简洁,容易实现,但由于采用固定步长扰动,不能同时获得较高的跟踪速度与稳态跟踪精度。针对这个矛盾,提出了一种新的自适应占空比扰动算法,运用Matlab/Simulink对光伏发电系统MPPT控制进行了建模与仿真,并研制了一台控制器,在BOOST变换器上与定步长扰动法进行了对比实验,仿真和实验结果证明该算法能准确快速地跟踪光伏阵列的最大功率点,大大提高了系统的动态和稳态性能。

The conventional perturbation and observation（P＆O）method is widely used in the photovoltaic array maximum power point tracking system, the algorithm is simple and easy to implement, but the excellent dynamic response and stable performance is difficult to achieve synchronously because using fixation step dis- turbance. A new adaptive duty cycle perturbation algorithm in view of the contradiction was presented, the MPPT control of PV power generation system was established and simulated with Matlab/Simulink and a con- troller was developed, the algorithm with fixed step perturbation method for the comparative experiments on the BOOST converter, simulation and experimental results validate that the algorithm can quickly and accurate- ly track the PV array maximum power point,and greatly improved the system dynamic and steady-state per- formance.