In this paper, a novel maximum power point tracking (MPPT) in PV system is presented. In sliding mode control schemes, discontinuous reaching law involves high control activity and the future may excite high-frequency dynamics. Reaching speed is also limited by using smoothing functions in reaching law of sliding mode control. Hence, a nonlinear reaching law is proposed by a fuzzy inference system as inputs in the sliding function, and to forecast the future error value, a one-step-ahead terminal voltage prediction is obtained by a grey prediction algorithm based on fractional-order model. The proposed algorithm has the advantage of high accuracy, maintaining faster response than other hardware implementations and handling both model-based and model-free approaches to make it easy for implement. Also, the new MPPT is integrated with novel design of dual-axis sun-tracking system based on rotational and linear joints. The system can be switched to linear-rotational or one-axis sun-tracking arbitrary as required by the user and automatically started up in the daytime with low electricity power consumption motors. Automatic sun tracking is attained against cloud disturbance and any weather conditions with high-power generation. The simulation and experimental results are presented to verify the effectiveness of the proposed dual-axis sun tracking and MPPT with a comprehensive comparison between the new approach and the other up-to-date algorithms and designs.

中文翻译：

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使用基于分数模糊灰色的滑模控制的线性旋转太阳跟踪系统的新型 MPPT

在本文中，提出了一种新颖的光伏系统最大功率点跟踪（MPPT）。在滑模控制方案中，不连续到达律涉及高控制活动，未来可能会激发高频动态。在滑模控制达到定律中使用平滑函数也限制了达到速度。因此，通过模糊推理系统提出非线性到达律作为滑动函数的输入，并为预测未来的误差值，通过基于分数阶模型的灰色预测算法获得提前一步的端电压预测. 所提出的算法具有精度高、保持比其他硬件实现更快的响应以及处理基于模型和无模型方法的优点，使其易于实现。还，新的 MPPT 集成了基于旋转和线性关节的双轴太阳跟踪系统的新颖设计。系统可根据用户需要任意切换为直线旋转或单轴追日，白天自动启动，低耗电电机。自动太阳跟踪是针对云干扰和高功率发电的任何天气条件实现的。仿真和实验结果通过新方法与其他最新算法和设计的综合比较来验证所提出的双轴太阳跟踪和 MPPT 的有效性。系统可根据用户需要任意切换为直线旋转或单轴追日，白天自动启动，低耗电电机。自动太阳跟踪是针对云干扰和高功率发电的任何天气条件实现的。仿真和实验结果通过新方法与其他最新算法和设计的综合比较来验证所提出的双轴太阳跟踪和 MPPT 的有效性。系统可根据用户需要任意切换为直线旋转或单轴追日，白天自动启动，低耗电电机。自动太阳跟踪是针对云干扰和高功率发电的任何天气条件实现的。仿真和实验结果通过新方法与其他最新算法和设计的综合比较来验证所提出的双轴太阳跟踪和 MPPT 的有效性。