Application Of Inductive Filtering Transformer In Photovoltaic Grid Connected System

With the rapid development of photovoltaic industry,the power quality problems caused by the inverter nonlinear devices are widely concerned.Photovoltaic power plant will produce harmonic current,which may affect the safe and stable operation of the power grid,and also may affect the normal operation of other electrical equipments.Therefore,it is of great significance to study the power quality of grid connected photovoltaic system.The main contents of this thesis include the following aspects.First of all,this thesis introduces the current situation of photovoltaic power generation at home and abroad.It expounds the significance of photovoltaic power generation and the necessity of developing photovoltaic power generation industry.From the aspect of power quality,this thesis analyzes the current situation of harmonic suppression and reactive power compensation,and makes an overall evaluation of the power quality of maple Township photovoltaic power station,obtained the necessity of harmonic suppression.Secondly,this thesis introduces the technology of inductive filtering,and introduces the basic principle of induction filter transformer and the working principle of SVG.On the basis of the existing inductive filtering technology scheme,the thesis puts forward a new scheme of harmonic suppression and reactive power compensation with SVG and load.The characteristics of induction filter transformer are analyzed,and the technical advantage of the inductive filtering scheme is revealed.Again,details a variety of technical conditions and principle of transformer should meet in the design process,analyzes the design of the three winding transformer,calculates methods of main parameters of engineering.This thesis introduces the design method of common filter,analyzes the parameters of each component which affects the filtering performance,and gives the topology structure of the inductive filter.Then determines the final filter design parameters,and capacity verification.Finally,based on the case study of the grid connected photovoltaic power plant,the system simulation model is established with MATLAB software.Simulation and analysis are carried out from the following three aspects:the harmonic of the inductive filtering and the traditional filter two schemes on the inhibition ability of comparative analysis,analysis of voltage stability characteristics of inductive filtering and SVG combination phase characteristics of voltage and the voltage stability characteristic in fault state.The simulation results are given to verify the superiority of the proposed filter transformer and SVG integrated scheme in harmonic suppression and reactive power compensation.