基于改进型非奇异终端滑模控制的光伏MPPT实现

Photovoltaic MPPT Based on Improved Non-singular Terminal Sliding Mode Control

光伏阵列的输出功率随着环境条件和负载变化而波动,为提高光伏发电系统的效率,提出一种基于改进型非奇异终端滑模控制的MPPT实现方法。此方法基于Boost电路的独立光伏发电系统,针对传统线性滑模控制在光伏MPPT响应速度慢、稳态抖振显著等问题,设计了改进型非奇异终端滑模切换面以提高系统稳态精度,解决了传统终端滑模控制存在的奇异问题。在保证快速响应的前提下,简化了非奇异终端滑模控制律并验证了系统的稳定性,从而降低控制系统的复杂程度。仿真与试验结果表明,在光照强度和温度变化的条件下,与传统控制方法相比,所提方法可以快速跟踪光伏最大功率点,具有更高的跟踪精度,系统具有很强的鲁棒性。

The output power of photovoltaic arrays fluctuates with environmental conditions and loads.To improve the efficiency of photovoltaic power generation systems,a MPPT method based on improved non-singular terminal sliding mode control is proposed.The method is applied to the standalone photovoltaic power generation system based on the Boost converter.Considering the slow response and significant steady-state chattering phenomenon of the traditional linear sliding mode photovoltaic MPPT control,an improved non-singular terminal sliding mode surface is designed to improve the steady-state accuracy of the system.It solves the singular problem of traditional terminal sliding mode control.On the premise of the fast response,the non-singular terminal sliding mode control law is simplified so that the complexity of the control system is reduced,and the stability of the system is verified.With the irradiation and temperature condition change,the simulation and experimental results show that compared with the traditional control method,the proposed method can quickly track the photovoltaic maximum power point with higher tracking accuracy and the system has strong robustness.