Analysis And Application Of Power Supply Technology Of Photovoltaic Power Generation System In Buildings

The eletricity of Chinese construction mainly rely on municipal power grid,and thermal power are the main supply for the municipal power grid.And the thermal power use the fuel which is non-renewable resources.When the municipal power grid expand quickly and the electricity increase,the municipal power grid are bear more perssure.The photovoltaic system of construction is a good supplement for the municipal power grid because of its environmental and no need to occupy the land.When the price of the photovoltaic reduce and the national policy to support,there will be a very good development for the photovoltaic system of construction.The thesis gives the main structure of the photovoltaic system: Photovoltaic system can divide to independent system and the grid connected system.And the grid connected system divide into the high voltage type and low voltage type.Next the thesis introduce the load characteristics and power distribution structure of civil construction.And it mainly contain lighting,motor and the special electricity.When the independent photovoltaic system use for the lighting load,it will get the highest efficiency.A 177.2 m building is used as the research object,and give the independent photovoltaic system scheme for it.After select the parameters of the wires and the equipment,then analysis the energy consumption and protection.The independent photovoltaic system will have a low efficiency because of load matching problem.The same building is used as the research object,and give high voltage grid connected PV system scheme and Low voltage grid connected PV system scheme for the building.Similarly select the parameters of the wires and the equipment,then analysis the energy consumption and protection.Central grid connected system always has a High efficiency because it has no load matching problem.The distributed power system could improve efficiency if reducing power supply,and let the power supply less than the use,and the insufficient part of power will supply by the municipal power.After compare all scheme,the best schme for Civil construction is the centralized grid system.When the amount of PV power generation is no more than 25% of the transformer's capacity,we use low voltage grid connected PV system better.When the amount more than 25%,then we use High voltage grid connected PV system better,it can supply power to the superior power grid.This thesis mainly researchs the photovoltaic power supply technology for construction,and it can promote the application for photovoltaic system in building.