| Growing concerns about energy crisis and environmental issues have attracted agreat deal of interest in the PV system using the nonpolluting renewable solar energy.The PV DC system, as an important policy to mitigate energy and environmentalissues and implement sustainable development, have less energy transmission, highefficiency, easy to expand other energy and low cost and improve the energyefficiency of buildings through DC bus directly to load.First, in order to reduce energy transmission link, improve efficiency of PV gridand independent system, the PV DC system composed of PV DC Grid-modules, loadand mains is proposed in this paper. Studied the output characteristics of PV moduleconvert solar into electrical.Secondly, as the core of PV DC system, PV DC Grid-module have a highperformance DC/DC converter with maximum power point tracking. The selection,design and analysis methods of the suitable dc-dc converter are researched.Thirdly, the main function of PV DC system is satisfied the demand of the load,the equivalent method of switching-power load and dc-motor load is researched. Thecontrol system of PV DC system is derived and the strategy and design method ofcontroller is gived.Finally, in order to solve the volatility of the DC bus caused by the change oflight intensity, load and mains, PV DC Grid System with Energy Storage is proposed.The influences of the system with energy storage into the DC bus is studied, work atdifferent voltage. The control system of PV DC grid system with energy storage isderived and the strategy and design method of controller is gived. The hardware andsoftware of the lead-acid battery and control are designed. |
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