摘要：In an isolated DC microgrid consisting of photovoltaic cells, an energy storage unit and load,reasonable control of grid-connected two-way AC/DC converter can effectively realize coordinated powerdistribution and bus voltage stabilization of the microgrid. A mathematical model of grid-connectedconverter was established first in this paper, followed by a simulation analysis of the grid-connectedconverter under direct voltage control. In consideration of the fact that the ideal dynamic voltage responsecould not be realized by conventional control of the grid-connected converter, a seamless switching controlstrategy of inhibiting voltage fluctuation was proposed based on the voltage fluctuation analysis of theAC/DC converter, which improved the robust stability of the DC microgrid. The effectiveness andfeasibility of the proposed control strategy were verified through the simulation results.
其他摘要：In an isolated DC microgrid consisting of photovoltaic cells, an energy storage unit and load, reasonable control of grid-connected two-way AC/DC converter can effectively realize coordinated power distribution and bus voltage stabilization of the microgrid. A mathematical model of grid-connected converter was established first in this paper, followed by a simulation analysis of the grid-connected converter under direct voltage control. In consideration of the fact that the ideal dynamic voltage response could not be realized by conventional control of the grid-connected converter, a seamless switching control strategy of inhibiting voltage fluctuation was proposed based on the voltage fluctuation analysis of the AC/DC converter, which improved the robust stability of the DC microgrid. The effectiveness and feasibility of the proposed control strategy were verified through the simulation results.
