Research On Electrical Design And MPPT Algorithm In A Rooftop Distributed Photovoltaic Power Station

In this paper,the design and research object of the 6MWp roof distributed photovoltaic power station in a paper making enterprise is designed and the electrical system of the whole photovoltaic power station is designed,and a MPPT algorithm based on particle swarm optimization and traditional P&O is proposed to solve the multi peak power problem of shadow occlusion.The main contents of this paper are as follows:This paper takes the photovoltaic power system as the research object,introduces the current situation of the development of photovoltaic power generation and the principle of the photovoltaic power generation system,as well as the structure and main equipment of the distributed photovoltaic power generation system.Through the analysis and comparison of various system plans,the electrical design and access scheme that meet the requirements of the project are put forward.According to the selection and parameter design of photovoltaic components,inverters,transformers,etc.according to the electrical design scheme,an electrical system of each subsystem is designed,and the two system design of the photovoltaic power generation system is designed according to the equipment layout and system characteristics,including the design of equipment communication scheme and the photovoltaic monitoring of the converge box,inverter and so on.Combined with the operation data and simulation model of photovoltaic power station,the influence of centralized MPPT on generation efficiency in distributed photovoltaic power generation system is analyzed.Finally,aiming at the problem of power multi-peak caused by shadow occlusion,this paper proposes a MPPT control algorithm which combines the particle swarm optimization algorithm with the traditional improved variable-step P&O,and the system simulation model is established by Matlab/Simulink software,and the effectiveness of the control algorithm is verified by simulation.