基于滑模控制的光伏系统MPPT控制策略

MPPT CONTROL STRATEGY FOR PHOTOVOLTAIC SYSTEM BASED ON SLIDING MODE CONTROL

针对现有的太阳电池最大功率点跟踪方法中存在的跟踪速度慢、在最大功率点附近存在振荡、外界环境发生变化时可能产生误判等不足，提出一种基于滑模控制的太阳电池最大功率点跟踪方法。在建立DC-DC变换器模型的基础上设计滑模控制器，得出控制函数，并通过李雅普诺夫方法进行稳定性和存在性分析。利用Matlab／Simulink对太阳电池模型进行仿真，验证该滑模控制策略的可行性；建立基于扰动观察法的太阳电池最大功率点跟踪模型，与滑模控制方法进行比较。结果表明在外界环境变化的情况下，该方法可实现较快的跟踪速度和较好的稳定精度，在自适应和抗干扰上具有较大优势。

The existing strategies of maximum power point tracking （MPPT） control for solar cells have some shortages, such as the slow tracking speed, oscillation near the maximum power point, misjudgment when the external environment changes, etc. insufficient, the MPPT control strategy of solar cells based on the sliding mode control is proposed. The sliding mode controller is designed based on the establishment of the DC-DC converter model and the control function is gotten, and the stability and existence are analyzed by the Lyapunov method. The Matlab/Simulink is used to simulate the model of solar cells and verify the feasibility of the sliding mode control strategy. The MPPT model of solar cells is set up based on the perturbation and observation method and then it is compared with the sliding mode control method. The results show that the method has faster tracking speed and more stable tracking precision in the case of the external environment changes, and its self-adaptation and anti-interference are also better.