Research On Maximum Power Tracking And Power Quality Control Of Microgrid Based On Photovoltaic Power Generation

With the development of science and technology,the demand for energy is also increasing gradually.Solar energy has become an important energy source.In recent years,photovoltaic power grid has been widely used.With the continuous progress of technology,the reliability of power supply has made great progress.Because some disturbances in the microgrid will bring great influence on the stable operation of the microgrid,the microgrid faults will be caused in serious cases.Therefore,it is an urgent problem to improve the power quality,make the micro grid run stably and improve the power quality.Meanwhile,the control strategy of new energy also needs to be further improved.First in this paper,we study the pv array maximum power point tracking strategy,based on a Firefly Algorithm(are Algorithm,FA)MPPT Algorithm of variable step,the structure and parameters of traditional FA Algorithm is analyzed and improved,disperses the Firefly initial position locating in the peaks of the possible voltage,and designs the twinkle is introduced to the adaptive adjustment fireflies step length,the FA Algorithm more practical in MPPT control direction.Compared with the other two algorithms,the simulation results show that this algorithm can track the maximum power point faster than the traditional algorithm.Secondly,by studying several micro power grid,the basic control strategy found that traditional methods have some shortcomings,this paper on the basis of the conventional droop control algorithm to join resistance coefficient ratio,and then studied the traditional PI algorithm of voltage and current double closed-loop,found its limitations,so the proposed control algorithm is based on PCI voltage current double closed loop control strategy,the method showed good control effect,can realize the communication and direct traffic at the same time zero steady-state error control.Finally,the simulation model is built in this paper,and Matlab/Simulink is used to conduct simulation analysis on the power quality control strategy combining the proposed improved FA algorithm,PCI control algorithm and improved droop control algorithm,so as to verify the feasibility of the proposed control algorithm.This paper has 52 pictures,3 tables and 47 references.