Research On Micro-nets Dynamic Characteristics Based On Photovoltaic Micro-sources

As the rapid development of economy and increases of energy demand, people have more sights on a distributed generation energy technology; micro grid has gradually become the trend. Solar is the most important basic energy in a variety of renewable energy. In this paper, the output of photovoltaic power generation system is not controllable features in the micro-net, so we use the fuel cells and super capacitors to manage the output energy of PV array. The fuel cells have slow dynamic response and it needs a long time to start; super capacitor has high power density and rapid response. Through energy management, the super capacitor provides power when there is a mutation in the load power, then stable fuel cell output.Simulation models are designed based on PSCAD / EMTDC platform, corresponding control strategies. Results show that the hybrid energy storage system can achieve good tracking of daily load forecast, and real-time power adjustment on the DC bus, reducing the adverse effects caused by output fluctuations of PV arrays on the micro grid. So the effectiveness of control strategies designs is verified.