Research And Design Of Energy Storage In Stand-alone Photovoltaic System

As a new green energy,solar energy has been concerned by the world.Photovoltaic power generation is one of the most widely used solar energy,and has a very good prospect.Independent photovoltaic power generation system,as a way of photovoltaic power generation,has been accepted and used by many people.In the independent photovoltaic power generation system to quickly find the maximum power point and can have a great influence on the stable working efficiency of the whole system;at the same time,the energy storage equipment as an important part of the photovoltaic system,the use of the length of time and the rationality of the charging system economy,practicality also has a great influence.And the user in building the system,reasonable matching battery and photovoltaic array capacity can reduce the economic cost to a great extent,in addition to the daily use of power of independent photovoltaic system,the effective lightning protection can largely reduce economic losses.Therefore,it is of great significance to study the charging mode,capacity calculation and lightning protection measures of MPPT and energy storage devices in stand-alone photovoltaic power generation.This paper first introduces the analysis of the status quo at home and abroad of photovoltaic power generation and energy storage technology and the power of independent photovoltaic system framework,and to analyze the characteristic of photovoltaic battery,in accordance with its principle,using simulation software to build a simulation model,the output waveform to prove its characteristics.Then several classical maximum power tracking methods are analyzed and compared,and the MATLAB simulation software is used for simulation verification.Finally,an optimized MPPT algorithm is proposed,and the waveform is compared with that of the previous algorithm.The second is to improve the independent photovoltaic power generation system in battery life and charging efficiency,and puts forward several charging method,comparative analysis and Optimization in the three section of the original charging mode,the MPPT maximum power tracking method and phase charging method used in conjunction,and in the three section on the basis of the original increase,four stepcharging method,and put forward a set of charging strategy.The simulation model is built on the MATLAB simulation software.The simulation results show that the method can effectively improve the efficiency of the battery charging and discharging mode.Finally,this paper puts forward a set of engineering design independent solar photovoltaic power generation system,capacity design method,including PV arrays and batteries and on the basis of the original capacity,puts forward a set of optimized design,effectively reduce the economic cost to build independent photovoltaic system.At the same time,in the design of lightning protection technology,in the original external lightning protection technology to increase the Faraday cage,can effectively resist the electromagnetic pulse effect,improve the lightning protection effect.And the design of three internal lightning protection measures,as well as the choice of grounding resistance.