基于改进滑模控制的光伏最大功率点跟踪技术

为了充分利用太阳能,改善光伏发电中普遍存在的跟踪速度慢、输出功率不稳定、转化效率低等缺点,基于光伏阵列工作特性和滑模变结构控制的特点,提出一种最大功率点跟踪控制策略。采用Boost电路作为实现电路,通过分析光伏阵列输出特性,设计相应滑模控制器,并对其中非线性分量进行改进;采用微滑模层代替传统的滑模面,减小系统振荡。利用Simulink仿真软件对该控制策略改进前后进行仿真分析,并与传统控制方法中的扰动观察法进行对比。仿真结果表明,该控制策略在跟踪速度、超调量以及跟踪的动态稳定性控制方面表现良好。

PV Maximum Power Point Tracking Technology Based on Improved Sliding Mode Control

In order to make full use of solar energy and improve the common shortcomings of photovoltaic(PV)power generation,such as slow tracking,unstable output power and low conversion efficiency,based on the characteristics of the PV array and the variable structure control of the sliding mode,a maximum power point tracking control strategy was proposed.The Boost circuit was used as the realization circuit.By analyzing the output characteristics of PV array,the corresponding sliding mode controller was designed,and the nonlinear component was improved.The traditional sliding mode surface was replaced by the micro sliding mode layer,which can reduce the oscillation of the system.Simulink simulation software was used to simulate the improved control strategy and made compare with the disturbance observation method in the traditional control method.The simulation results show that the control strategy performs well in tracking speed,overshoot control and tracking dynamic stability.