| Nowadays,the shortage of traditional energy has become a great challenge,which faced by all countries,so that the new energy power generation has attracted more and more attention.Solar energy act as the most promising clean energy was widely concerned in many renewable energy.At the same time,with the technical development of power electronics and energy storage components,the distributed photovoltaic study on the micro grid system has been developing rapidly.The DC micro-grid under grid-disconnected circumstance has the advantages of stable operation and simple control,also let be attention.The object of this study is DC micro-grid system under grid-disconnected circumstance,which included PV array,battery and controllable load.Firstly,a photovoltaic DC micro-grid model was established,it included the simulation model of photovoltaic battery,Buck interface circuit of micro-power,Buck/Boost converter circuit and the simulation model of the battery.Secondly,this paper designed a power control strategy of photovoltaic DC micro-grid and applied improved adaptive variable-step and constant pressure control strategy in photovoltaic power system;The battery of energy storage system realized bi-directional charge and discharge control with the DC bus by voltage and current double loop PI control.Its controllig simulation results show that the control strategy can ensure the photovoltaic DC micro-grid power balance.Finally,according to the system model and control strategy,we builded the experimental platform of photovoltaic DC microgrid by using DSP2812,and then do the independent PV power generation experiments and battery charge and discharge experiments under different conditions,the experimental results further verified the rationality of the photovoltaic DC micro-grid power control strategy. |
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