Research On Power Control Strategy Of Microgrid

When the micro-grid is islanding, micro-grid including new energy power generation in the maintenance of voltage/frequency levels and maintain a balance of power there is great difficulty in basic aspects. Therefore, we made the following study.First, based on MATLAB/simulink simulation software to build a wind power generation system、photovoltaic(PV) system、battery simulation model, based on perturbation and observation method as the maximum power point tracking photovoltaic system was simulated to study, research the bi-directional DC-DC battery charging and discharging control structure model; then, a variety of inverter and its control method models,based on the microgrid master-slave and peer from two control structure studied separately, the simulation results demonstrate that the control model was built correctly and in the load fluctuations process can maintain good regulation.Secondly, propose the improved P-V/Q-F droop control method, simulation studies in parallel operation of distributed power micro-grid containing a different number, the simulation results show that the improved droop control method can accurately control in proportion to the output power of each power supply;further,in the microgrid containing scenery storage power are considered charging and discharging process of the battery.Finally, research the micro-grid energy management system, implemented by the power supply side of the automatic adjustment of smaller load fluctuations in accordance with the capacity size, real-time monitoring of the micro grid situation by the EMS, automatic adjustment larger microgrid change, in order to maintain the micro-grid continue to run, and made a simulation under different circumstances. Simulation results show that the improved droop control and energy management system compatible applications to achieve stable operation of a variety of micro-grid situations.