自适应趋近律滑模控制的光伏系统最大功率点跟踪控制

MPPT Control of Photovoltaic Systems Based on Adaptive Convergence Law Sliding Mode Control

在光伏系统最大功率点跟踪(MPPT)控制中,针对扰动观察法响应速度慢、抖振显著,传统滑模控制无法兼顾响应速度与抖振,在幂次趋近律与变速趋近律的基础上,提出基于自适应趋近律滑模控制的光伏系统MPPT控制策略。当系统状态远离滑模面时,幂次项可保证足够大的趋近速度;当系统状态趋近滑模面时,变速项可调整滑模区宽度,削弱抖振,使系统最终稳定。仿真结果表明,基于自适应趋近律滑模控制的光伏系统MPPT控制策略能有效提高光伏发电系统的稳定性和稳态准确性,增大高光伏发电系统响应速度。

In the MPPT control of photovoltaic system,because of the slow response speed and significant jitter of the disturbance observation method,the traditional sliding mode control cannot balance the response speed and jitter.Based on the power convergence law and the variable speed convergence law,we propose an MPPT control strategy for photovoltaic system based on the adaptive convergence law sliding mode control.When the system state is far from the sliding mode surface,the power term can ensure a large convergence speed;when the system state converges to the sliding mode surface,the variable speed term adjusts the width of the sliding mode area with the system state to weaken the jitter,which makes the system stable in the end.The simulation results show that the proposed MPPT control strategy for PV system based on adaptive convergence law sliding mode control can effectively improve the stability and steady-state accuracy of PV power generation system and increase the response speed of high PV power generation system.