Research And Implementation Of Computer Aided System In Civil Building Based On AutoCAD Environment

Relative to the coal power generation, the solar energy is inexhaustible renewableresources, photovoltaic power generation system has the advantage of free fromcontamination. Therefore, with the energy-saving emission reduction has receivedmore and more attention of the state and society, grid-connected photovoltaic powergeneration system in the civil buildings has been widely applied.At present, in civil building engineering design, China’s photovoltaicgrid-connected generation system is mostly engineers rely on their own experience,using artificial way calculate and design, this way has great uncertainty andsubjectivity, and the query and calculation data is more, that will inevitably lead tosome errors caused by human factors. With the rapid development of computertechnology and penetration of subjects, using the computer technology can effectivelyovercome the disadvantages, those brings from design engineers using artificialcalculation and design, thus free designers from the tedious work, designers havefocused on the development of science and technology.This paper is based on the knowledge of photovoltaic grid-connected generationsystem, combined with the engineers, investment and social perspective, thensummarizes several useful mathematical model about the civil construction ofgrid-connected photovoltaic system engineering design:The calculation model of thesolar battery in matrix surface radiation, The calculation model of the solar battery inthe matrix installation angle, the calculation model of PV array minimum allowablespacing,the calculation model of grid-connected photovoltaic system installedcapacity, the identified model of the building lightning protection class,environmental benefit analysis model. Those mathematical models provide a goodtheoretical basis for the design of photovoltaic grid-connected generation systemcomputer aided design software.Taking advantage of the Access database knowledge, this article use VBA (VisualBasic for Application) development tools for the secondary development through theAutoCAD software, when the AutoCAD software activities, it can Automatically loadcustom menu,by clicking the menu bar of the menu item,it can operate the developedsoftware,which has good man-machine interactive interface and convenient operationcharacteristics.The Grid-connected PV system CAI designed software is divided into three functional module: System calculation、draw pv modules and design results query、modify and output. The main function of the realization is as following:New projectinformation、The best Angle of Pv modules and element receiving the total solarradiation calculation、System installed calculation、 Photovoltaic module and gridinverter matching selection、 Pv modules minimum installed spacing metercalculation、 Installation the grid-connected PV system building lightningproofcategory sure、System year、month generating capacity estimation、System investmentand the investment capital recovered in calculation、The system of environmentalprotection benefit analysis、Related database updation、Related information output indesign process、Automatic drawing plan of the pv modules in the AutoCAD softwaredrawing area a ccording to the result of system design.