| Solar energy has become the favour of people for its rich resources and pollution-free.But the cost of solar cells is high and the raw material is also extremely limited.In addition,the utilization rate of solar energy is in very low stage,only10%or so.In order to improve the utilization of the rich resource,we have to track the maximum power point of solar energyStand-alone photovaltic generation system can meet the need for small and medium-size power users basically.Generally speaking,solar generation system consists of photovaltic array,battery and solar controller.The controller is to regulate and stabilize the voltage for maximum power point tracking,which also prevent storage battery overcharging and discharging to maintain system ballence.This article describes the basic components of photovaltic gengeration system and has given the characteristics and principles of solar cell.In order to study the performance of solar energy,we model and simulate the solar cell with sofeware combined with the physical parameters and the actual operating parameters.The model is in line with solar cell theory data from the simulation.we describe the concept of maximum power point tracking and several common algorithm through the analyses of characteristic and finalize the tracking algorithm.we also simulate the maximum power point tracking algorithm and verify the fast response and stability of the algorithm by MATLAB,combined with the main circle topology.The controller with MPPT can control charge and discharge to avoid overcharging or over discharging phenomenon,which can store the electricity energy gengerated by photovaltic cellThe system adopts DC-DC converter topology, analyzing and summarizing the advantages and disadvantages of various transform circuit,and TMS320F2812DSP chip as controller for maximum power point tracking and battery controlling,which uses IGBT and BUCK topology as maintopogy circuit.We also complete the design of software to achieve the functions of the controller... |
