| With the rapid development of power-electronics technology, the wider adoption ofrenewable energy sources, and the improvement and cost reduction of energy storagesystems, A variety of dc micro-grid have been proposed for commercial facilities .In orderto maximize the use of renewable energy , Effective control strategy must be adopted.Thus, research on energy control of dc micro-grid has become more and more popular.This paper takes a DC micro-grid which consists of photovoltaic array (PV), storagebattery and fuel cell as the study object. A method based on bus voltage droop is proposedfor achieving energy control of the system.Optimization object of each source is selected after the investigation of each sourcein this paper. For PV, mppt (maximum power point tracing) is implemented to achievemaximum efficiency of utilization of solar energy. Battery, as a indispensable element,should charge or discharge in a timely manner in the presence of power unbalance causedby renewable energy. In addition, the optimization of capacity of battery, should be takeninto account. Fuel cell has a operational band, which is called economic operational band.Its output current and voltage is relatively stable in this band. So, fuel cell should operatein the economic operational band.Different operation models of the system are described in detail. Distributed controltopology is adopted since it achieves a high degree of reliability. The control law isimplemented by embedding the portion of the control law related to the operation of eachsource in the source’s local controller. Each source controller communicates with the othernodes that affect its operation in order to determine its own mode of operation.In the end, simulation results are carried out by MATLAB software，the experimentalresults verify the energy control adopting bus voltage droop method.an experimentalplatform of dc micro-grid based on 2407DSP is built. The relevant control programs arecomplied. |
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