A nonlinear sliding mode controller is proposed for a single stage grid-connected photovoltaic system with a novel nonlinear sliding surface. The proposed controller is designed to ensure maximum power extraction with unity power factor. There are two main advantages of the proposed sliding surface. The new surface will results in a first order sliding mode controller. The second advantage is that maximum power extraction is achieved by tracking DC-link voltage ($V_{dc}$) of the PV system. The proposed controller is also compared with the existing sliding mode controller in terms of both numerical simulation and experimental results. It is found that, the proposed controller’s performance is better than the existing controller in terms of power extraction and more robust when there are uncertainties and disturbance in PV system.

针对具有新型非线性滑动面的单级并网光伏系统，提出了一种非线性滑模控制器。所建议的控制器旨在确保以统一的功率因数获得最大的功率提取。所提出的滑动表面有两个主要优点。新表面将产生一阶滑模控制器。第二个优点是，通过跟踪直流母线电压（$V_{dC}$）。从数值模拟和实验结果两方面，将提出的控制器与现有的滑模控制器进行了比较。结果发现，在光伏系统存在不确定性和扰动的情况下，提出的控制器在功率提取方面的性能优于现有控制器，并且更加鲁棒。