Global Photovoltaic Maximum Power Point Tracking Methods And Applications

Solar energy plays an important role in the power generation.It employs a non-pollution facility to solve the energy and environment crisis.This paper studies the maximum power point tracking(MPPT)solution for the PV system under partial shading phenomenon,the research includes three aspects,PV cell model,MPPT control algorithm,and MPPT control system.Therefore,the following research has been down in this paper:(1)This paper mainly focuses on the characteristics of nonlinearity and uncertainties of the power-voltage characteristics of the PV cells.The mathematical modeling of the photovoltaic cells based on the theory of photovoltaic,and the simulation has been done under power generation case using different environmental conditions.Based on these results,the V-I characteristic showed a regular variation under the different environment factors.With different shading conditions,the output power-input voltage characteristic curve of photovoltaic power generation system presents different non-convex function characteristics,which proves the correctness of simulation results for the further researches of maximum power point tracking method for complex characteristic curves.At the same time,the simulation model of MPPT control system is established,which provides an experimental platform for the further study of MPPT control algorithm.(2)This paper puts forward a kind of improved simulated annealing algorithm and gradient disturbance observation method.They create a hybrid MPPT controller by integrating the pervious methods.First,an improved simulated annealing algorithm is included,to solve the random search extremum mathematical problems.Then,design a hybrid MPPT controller to control the global maximum power point tracking,solving the classical local extremum search method which cannot be solved by global extremum search obstacles.(3)This paper creates a set of solar photovoltaic power generation MPPT control system based on hybrid algorithm.Using the Boost converter as the main control hardware,a set of control software based on embedded system is developed,which uses the actual output PWM waveform of the control system to complete the solar circuit system.The experimental results show that the new method can effectively improve the efficiency of photovoltaic power generation.