Research On Photovoltaic Maximum Power Point Tracking Technique Based On Gravity Search Algorithm

Photovoltaic(PV)systems are increasingly becoming a hot spot for research and development in the field of renewable energy generation,and the output efficiency of solar power systems is a hot topic that of most concern to researchers.However,the output of the solar power system is greatly influenced by the external environment and has obvious nonlinear characteristics.In this paper,the maximum power point tracking technology of photovoltaic power generation system is studied.Firstly,the mathematical model of photovoltaic cell and its array is built,the realization mechanism of photovoltaic power generation system MPPT is analyzed,and the output characteristics of photovoltaic cell are analyzed in detail.Then it classifies the commonly used MPPT algorithm,analyzes in detail the problems existing in the MPPT control technology in the process of maximum power point tracking under the changing external environment conditions,and proposes an MPPT algorithm based on the improved gravity search algorithm.In this study,the maximum output effect of pv system is improved by improving the tracking time and accuracy of existing MPPT tracking algorithm.Based on the gravity search algorithm,the dynamic weight is added into the gravity constant change factor,and the relative factors of memory and population information exchange are added into the particle velocity update formula to improve the algorithm.Igsa-mppt not only reduces tracking time and improves tracking accuracy,but also reduces reference voltage fluctuations.Finally,the simulation results are compared with the MPPT algorithm of particle swarm optimization(PSO-MPPT)and gravitational search algorithm(GSA-MPPT): Compared with PSO-MPPT and GSA-MPPT,the average tracking time of IGSA-MPPT is shortened by 0.023 s and0.0116 s,respectively,and the average growth rate of maximum power is increased by 1.7071%and 0.7001%,respectively.In the simulation of photovoltaic system with different illumination and temperature,its performance is also better than other algorithms.In conclusion,compared with other algorithms,IGSA-MPPT has better performance in tracking time and accuracy.In practical application,it can improve the output efficiency of photovoltaic power generation system.