Research Of Maximum Power Point Tracking Algorithm For Photovoltaic Array Under Partial Shading

The use of energy is indispensable in the progress of human society.With the continuous development of science and technology,traditional energy can no longer meet human needs.The research of new energy has become a hot topic.As a green and renewable energy source,solar energy has bright future and even becomes a substitute for non-renewable energy.Photovoltaic power generation is a major form of solar energy utilization.In recent years,many scholars have conducted research and the majority of the research are on arrays under ideal conditions.Photovoltaic arrays may receive non-uniform illumination due to various factors such as foliage,dark clouds,buildings in real life and the output curve exhibits multiple extreme values.In this case,the traditional algorithm may find the local maximum power point,which affects the efficiency of photovoltaic power generation.Therefore,it is of great significance to study the maximum power point tracking technology of PV array under shading condition.Aiming at the defect,this paper proposes two different algorithms.Most photovoltaic power stations in western China are in the form of centralized large-scale.Therefore,an improved particle swarm optimization algorithm based on environmental parameters is a good algorithm.As a new intelligent algorithm,this algorithm is suitable for searching the maximum value of the multi-peak characteristic curve.In the east-central part of China,buildings are dense and distributed photovoltaic power generation is generally used.The maximum power point tracking is performed for each photovoltaic cell,followed by series and parallel connection.This paper proposes a hysteresis loop variable step-rate perturbation observation method based on power variation.The above two methods are simulated and analyzed in MATLAB/Simulink.The results show that the two algorithms can track the maximum power point more quickly and the dynamic and stability are very good.Then the paper also designed the specific circuit and the corresponding software to verify its feasibility.