Study On Control Algorithm Of Maximum Power Piont Tracking For Photovoltaic Power Generation System Based On Sliding Mode Variable Structure Control

With the sustainable development of the global economy,energy is an important factor affecting economic development,and traditional energy is gradually depleted and accompanied by an increasingly serious environmental pollution problem.Human beings must solve these problems so as to embark on the road of sustainable development,so the development of new energy is the trend.Solar energy has obvious advantages by the world's attention,but the current price of photovoltaic panels is still high,and photoelectric conversion efficiency is low,so greatly restricting the promotion of photovoltaic power generation system.The study of photovoltaic power generation technology is to promote people to increase the use of solar energy,to improve the performance of photovoltaic power generation system.The maximum power point tracking(MPPT)control is the core technology of photovoltaic power generation.The research is very important to improve the efficiency of the system and reduce the operating cost.This paper will focus on small photovoltaic power generation system controller in-depth study,focusing on photovoltaic array maximum power tracking control algorithm.In order to solve the shortcomings of some methods in terms of maximum power tracking speed,accuracy,stability and anti-jamming ability,this paper proposes a method to implement the maximum power point tracking control of photovoltaic power generation system by using sliding mode variable structure control algorithm.The synchronous Boost converter is used as the DC-DC converter circuit and designe the hardware circuit of the controller.Finally,the small photovoltaic power generation system controller is developed based on STM32F405.Based on the characteristic equation of photovoltaic cell output,this paper uses Matlab/Simulink to establish the PV array simulation model,and obtains the output characteristic curve of PV cell.According to the structure of the independent photovoltaic power generation system,the synchronous Boost circuit is used as the DC / DC converter circuit,and the simulation model of the maximum power point tracking control system is established.The tracking performance of traditional disturbance observation method,conductance increment method and sliding mode control algorithm is simulated under the light intensity changes drastically and disturbs the environment conditon.Compared with the simulation results,it is found that the sliding mode algorithm has the characteristics of fast tracking speed,good stability and strong anti-interference ability.Finally,using sliding mode control algorithm for photovoltaic maximum power tracking experiment on the design of the hardware platform,then analysis of experimental results.The work done in this paper provides the basic data for the future application of the algorithm to the photovoltaic power generation system.