基于扰动观察和二次插值的光伏发电最大功率跟踪控制

MPPT control for PV power generation system based on P&O algorithms and quadratic interpolation

提出了一种改进的光伏发电最大功率跟踪方法,由扰动观察法和二次插值法相结合,搜索到最大功率点,通过恒压法使光伏阵列工作在该点。该方法综合了以上三种方法的优点,可以避免扰动观察法控制时电压震荡造成的功率损失,以及恒电压法控制时不能随环境条件实时调整工作电压的缺陷。在Matlab/Simullink平台上进行了建模仿真,并研制了一台控制器,以验证所提出方法的有效性。仿真和实验结果表明,采用所提出的控制方法,能快速精确地搜索到光伏阵列的最大功率点,工作电压稳定。

An improved maximum power point tracking method for PV power generation system is proposed.The maximum power point is sought through perturbobserve algorithms and quadratic interpolation method, then ,the PV panel will be forced to operate at the maximum power point through constant voltage tracking. As aresult,taking the advantage of the above three methods,the new method avoids the power loss caused by voltage oscillation when using PO algorithm and overcomes the shortcomings that operation voltage can not be adjusted with environment change when using constant valtage tracking.The whole system is modeled and simulated on MATLAB/Simulink and a controller is developed.Simulation and experimental results validate that the proposed method can search the maximum power point of PV array precisely and fast,and the operation voltage is stable.