MPPT Optimal Control Based On Disturbance Fuzzy Dual Mode

At present,fossil energy is increasingly exhausted and environmental problems are increasingly prominent.Photovoltaic power generation system has many advantages,such as clean,environmental protection,high efficiency and so on,so it shows great application potential in the field of new energy.In addition,with the rapid development of photovoltaic power generation technology,photovoltaic power generation tends to be widely used,and will gradually transition from supplementary energy to alternative energy.However,the output of photovoltaic cells is highly nonlinear due to the influence of light and temperature,which makes photovoltaic cells unable to output at the maximum power and affects the power generation efficiency of the system.So how to improve the efficiency of photovoltaic system is an urgent problem.At present,MPPT technology is generally used to improve the photoelectric conversion rate of photovoltaic system.The first mock exam algorithm can not improve the speed of tracking and the stability of the system simultaneously.In this paper,a disturbance fuzzy dual mode control algorithm is proposed to realize the optimal control of photovoltaic MPPT.Through the simulation and analysis of the dual-mode control algorithm and the traditional algorithm by Matlab,the hardware circuit of the system is designed,and the experimental platform is built to verify the rapidity and stability of the proposed disturbance fuzzy control method.This paper mainly includes the following aspects:(1)This paper introduces the advantages of photovoltaic power generation and the development status at home and abroad,and puts forward the research methods and main research contents.(2)This paper introduces the composition of photovoltaic system and the working principle of photovoltaic cells,establishes the mathematical model of photovoltaic cells and builds the Matlab simulation model,analyzes the output characteristics of photovoltaic cells,and gives the change rule of the output of photovoltaic cells when the external conditions change.(3)This paper introduces the typical DC / DC converter and boost boost circuit,studies the traditional MPPT control algorithm in MATLAB,analyzes the widely used algorithms such as disturbance observation method and fuzzy control method in detail,compares the simulation results,obtains the advantages and disadvantages of various algorithms,and provides a theoretical basis for improving the combination algorithm ofoptimization speed and system tracking stability at the same time.(4)On the basis of constructing disturbance observation method,fuzzy control method model and simulation,the disturbance fuzzy dual-mode MPPT optimal control algorithm is proposed.Through system simulation,the technical index data of the MPPT algorithm are analyzed by using the time of the first optimization,the stability of the output power and the time of the second optimization after the external environment changes.(5)On the basis of simulation,a small power experiment platform is built to design the hardware circuit of the photovoltaic power generation system,which verifies the superiority of the proposed disturbance fuzzy dual-mode control algorithm in improving the optimization speed and system stability.