基于超螺旋滑模控制光伏MPPT的实现

Super-twisting sliding mode controller used in photovoltaic system MPPT

针对光伏发电过程中功率输出随机性的问题,提出一种基于超螺旋(Super-Twisting)二阶滑模控制的MPPT实现方法。此方法基于Boost升压电路,通过选取合适的滑模面将离散控制率转移到高阶,使控制量在时间上连续,从而设计了一种无抖颤滑模变换器,以实现光伏输出最大功率跟踪,并消除抖振的影响。为了验证算法的优越性,在Matlab/Simulink中搭建光伏发电系统模型进行仿真实验。结果表明:在光照强度和温度变化的条件下,相比于传统的控制算法,二阶滑模控制算法能快速实现最大功率跟踪,具有很强的鲁棒性。

Considering the random output of photovoltaic power generation in the process of generating electricity,a Super-Twisting sliding mode control algorithm for Maximum Power Point Tracking(MPPT)is proposed which is based on Boost circuit.By selecting appropriate sliding mode surface,the higher-order discrete control rate can be obtained,which leads to continuous control variables in time.Thus a chattering-free sliding mode converter is designed to achieve the MPPT,meanwhile,the influence of chattering is effectively eliminated.In order to verify the superiorities of the algorithm,a photovoltaic power generation system model is built in Matlab/Simulink to carry out simulation experiments.Compared with the traditional control algorithm,the results reveal that the proposed method can quickly achieve the MPPT under the disturbances of variable light and temperature,which exhibits strong robustness simultaneously.