Research On Maximum Power Control Of Photovoltaic Generation System

With the rapid development of current social economy, the demand for energy consumption is increasing, environmental pollution problems become more and more serious,which impacts on people's normal life and health seriously. It is urgent to solve the contradiction between the energy shortage and the survival of mankind effectively. In the development and utilization of new energy sources, solar photovoltaic power generation technology has become a new technology to reduce energy and environmental pressure because of its clean,no pollution,huge reserves and so on.Combined with the researchs and developments of PV power generation technology at home and abroad, this paper focuses on the maximum power point tracking control strategy of photovoltaic power generation, the main work is divided into the following parts:This paper describes the background and significance of the topic firstly, analyzes the development status and research trends of photovoltaic power generation at home and abroad, introduces the key technologies involved in the photovoltaic power generation.The basic principle of photovoltaic power generation and the relationship of photovoltaic cells and photovoltaic modules and photovoltaic array are researched and established the mathematical model and simulation model of photovoltaic cells.The output characteristics are simulated and analyzed, and this paper introduces briefly the composition and classification of photovoltaic power generation system.Aiming at the problem of maximum power point tracking control, the basic principle of constant voltage control method, perturbation observation method, and fuzzy control method are analyzed.The simulation models are established by Matlab/Simulink software,and verified the feasibility of the maximum power point tracking control for photovoltaic power generation.For the multi peak phenomenon in photovoltaic power generation, this paper combines with the PSO algorithm and the fuzzy control method,the fuzzy multi-objective control strategy based on PSO algorithm is researched, through the simulation analysis, verified the feasibility of the strategy in MPPT.Finally, according to the problems of parameter setting and external disturbance in the grid connected photovoltaic system, the control strategy based on backstepping sliding mode control is studied. In order to further study the maximum power point tracking problem, the PSO algorithm is improved. Through the simulation analysis, this control strategy has the characteristics of strong anti-interference of parameter settings and conditions outside interference are validated, the improved PSO algorithm has fast tracking speed and higher steady precision characteristics.