Research And Application Of Smart Photovoltaic Micro-Grid

With the development of economy and electric,people pay more and more attention on the effective utilization of recyclable energy.DC micro Grid become more and more popular as a new kind of g rid organization because of fewer conversion,high efficiency,convenient and flexible control.However,compared to AC micro grid,the control and management strategy of DC micro grid is not so developed and different country and natural resource are different.So it is difficult for us to ccoordinate these micro source,realize the complementary advantages of all kinds of functions.The power management is not only for the improvement of power quality,but also the economic benefit,which also offer great significance to the energy and environmental crisis.Paper has introduced the micro grid structure,as well as the different characteristics of micro power grid and energy storage device,and analyzes the corresponding control strategy.Further analyzed the dc micro power grid and its main advantages:It don’t need to consider the effect of phase and frequency;And greatly reduces the reactive power on the road in the online.What’s more,it Introduced the control strategy of battery and super capacitor as the energy storage device.The research object of this article for the micro source is DC micro grid which is made up of photovoltaic cells,battery energy storage.The grid as a supplement of energy can complement each other control systems.This paper designs a set of control circuit which can realize the two-way flow of energy to ensure the stability of the dc bus voltage,and it is able to replace the bi-directional inverter,which reduce the cost.The main work which should be done are as follows:Firstly state the concept of micro grid and DC micro grid,and describe the advantage of DC micro grid,analyze the which role PV cell and batteries have been played on the DC micro grid.And then research the strategy to control the PV cell and batteries of DC micro grid and the way to make sure that there is no time delayed to supplement the energy for users.Finally take the photos as the evidence to prove the strategys are efficient.