Research And Design Of Household Single-phase Grid-connected Photovoltaic Generation System

Energy crisis has become another problem restricting the development of human beings,solar energy as the most promising renewable energy draws attention of more and morecountries.Photovoltaic power generation is the most promising utilization form of solarenergy, will become the main source of energy for human development, has been widelypopularized and applied.In this paper, the status of photovoltaic industry is described, the significance ofphotovoltaic power generation is discussed.The paper also introduces the status of the use ofhousehold photovoltaic power generation system.The paper introduces classifications of photovoltaic grid-connected power systems andthe characteristics of every structure. Compare and select the requried DC DC and DC ACcircuits. The paper discusses parameter settings of components in DC DC and DC ACcircuit. This paper do research and design of single-phase grid-connected photovoltaic powergeneration system of200W.Analyze the working principle and characteristics of photovoltaic cells, establish modelof photovoltaic cells. Make an analysis and comparison of several commonly used maximumpower point tracking methods, on this basis, the paper provides the improved perturbation andobservation method,make a simulation using MATLAB/Simulink.Simulation results verifythe correctness of the method.Secondly, in the control strategy,the paper describes theworking principle and control target of single phase photovoltaic grid connected inverter.Choose the voltage and current double closed loop method by comparing several parallelways.Using MATLAB/SIMULINK to build simulation model of control system ofphotovoltaic grid-connected inverter, simulation results demonstrate the feasibility andeffectiveness of the method.This part introduces the structure and control method of the system.The modular designand the module circuits of the system is given.This system uses TMS320F2812as the digitalcore, making a prototype of photovoltaic grid-connected inverter. The prototype is tested onfunction and efficiency.The prototype is with good electrical properties, and small volume,light weight, simple structure.The prototype is safe and reliable.