随着化石能源的枯竭以及使用过程带来的环境污染问题日益严重，可再生清洁能源引起了全球的关注。太阳能作为可再生能源之一，有着清洁、储量丰富等诸多优点而倍受人们的关注。光伏发电是利用太阳能资源的主要形式之一，但光伏电池输出特性曲线会随着光照强度、环境温度等因素的变化而变化，从而影响光伏电池的光电转换率。最大功率点跟踪(MPPT)技术是提高光伏电池输出功率的关键技术，对整个光伏发电系统发电量的提升有着至关重要的作用。 本文以最大限度提高光伏电池输出功率为目标，研究了MPPT光伏控制器及其控制算法。首先通过分析光伏电池工作原理，建立了光伏电池等效电路工程数学模型，并通过光伏电池仿真模型得出光伏电池的输出特性与光照强度和温度的关系。其次对常规MPPT算法的优缺点进行了分析，并针对滑模控制抖振问题做了改进和优化，通过Matlab/Simulink仿真平台将优化后的算法与传统算法进行比较，验证了优化后的算法具有良好的控制性能。然后，对MPPT光伏控制器的硬件电路和软件程序进行了设计，包括主电路DC/DC电路，无源无损软开关电路，控制电路，采样电路等硬件电路的选择和参数的计算。软件的设计包括主程序的设计及ADC中断子程序和PWM中断子程序的设计等。 最后，通过搭建的光伏控制系统实验平台来验证优化后的MPPT控制算法的性能和验证MPPT控制器对光伏电池输出功率的提升效果。实验结果表明，优化后的滑模控制法具有良好的控制效果以及所设计的MPPT控制器能有效的提高光伏电池输出的发电量。

With the depletion of fossil energy and the growing environmental pollution problems caused by the use of renewable energy, renewable clean energy has attracted global attention. As one of the renewable energy sources, solar energy has attracted many people's attention because of its many advantages such as cleanliness and abundant reserves. Photovoltaic power generation is one of the main forms of utilizing solar energy resources, but the output characteristic curve of photovoltaic cells will change with the changes of light intensity, ambient temperature and other factors, thus affecting the photoelectric conversion rate of photovoltaic cells. Maximum Power Point Tracking (MPPT) technology is a key technology to improve the output power of photovoltaic cells, and plays a vital role in the increase of power generation of the entire photovoltaic power generation system. The paper aims to maximize the output power of photovoltaic cells and carried out research on the MPPT photovoltaic controller and its control algorithm. Firstly, by analyzing the working principle of photovoltaic cells, a mathematical model of photovoltaic cell equivalent circuit engineering was established, and the relationship between the output characteristics of photovoltaic cells and the light intensity and temperature was obtained through the simulation model of photovoltaic cells. Secondly, the advantages and disadvantages of the conventional MPPT algorithm are analyzed, and the chattering problem of sliding mode control is improved and optimized. The optimized algorithm is compared with the traditional algorithm through the simulation platform of MATLAB/Simulink, which proves that the optimized algorithm has good control performance. Then, the hardware circuit and software program of MPPT photovoltaic controller are designed, including the main circuit DC/DC circuit, passive lossless soft switch circuit, control circuit, sampling circuit and other hardware circuit selection and parameter calculation. The design of software includes the design of main program and ADC interrupt subroutine and PWM interrupt subroutine. Finally, an experimental platform of photovoltaic control system was set up to verify the performance of the optimized MPPT control algorithm , and to verify the effect of MPPT controller on improving the output power of photovoltaic cells. The experimental results show that the optimized sliding mode control method has good control effect and the designed MPPT controller can effectively improve the output of photovoltaic cells.