Research On Photovoltaic System Maximum Power Point Tracking And Islanding Effect Detection

With the rapid development of smart power grids,such questions as the paralleling operation of electric generators and the synchronous parallel between the smart power grids have gradually become heated topics in research.Above all,under the overall situation with increasingly severe energy crisis and impending environmental pollution worldwide,solar energy has attracted extensive attention from all circles of the world with its multiple advantages,such as the high reliability,recyclability,cleanness and pollution-free,etc.Under the current market-oriented economy,the energetic development and thorough utilization of solar energy is of great practical significance to the solution of power utilization in those economically undeveloped regions with no power supply.In the meanwhile,it is also where the transformation of Chinese energy structure and the improvement of the current energy should start and base on.First of all,the current situation of worldwide energy and the background of domestic and overseas research in this field are briefly introduced in this research.Next,the operating principle and characteristics of photovoltaic power generation are elaborated in details.Secondly,in consideration of the tracking of the maximum power point in the photovoltaic power generation system,the strengths and weaknesses of several methods are compared and analyzed.The system function of particles swarm optimization-based fuzzy controller rewriting is adopted in the tracking of the maximum power point.By virtue of MATLAB/Simulink-based modeling and simulation,results are acquired.It is demonstrated that this method can track the maximum power point more swiftly and accurately.In the last part,a research is conducted on a special fault detection method,namely island detection,in the photovoltaic grid-connected system to a certain extent.The basic concept and occurrence mechanism are taken as the entry point in the analysis of the strengths and weaknesses of several commonly utilized detection methods.Through MATLAB/Simulink-based modeling and simulation,islanding effect is detected with an active current output interference method.Through the simulation result finally achieved,it is learnt that this method is of great prospect and significance in the detection of islanding effect.