Research On An Internet Structure Based Control System For Energy Microgrid

Energy consumption currently is mostly caused by non-renewable energy, while the usage rate for recyclable energy is very low. And this is an urgent problem to be solved for the energy crisis. It is obvious that energy crisis can be solved by increasing the using rate of green energy and renewable energy. In order to realize this great goal, we have not only to construct large wind-power plant and solar-energy plant but also take the advantage of small capacity renewable distributed energy. Some scholars have put forward the concept micro power grid for the purpose to make full use of distributed energy for residential users. As an efficient way for the usage of the distributed power supply, micro power grid is developing very fast both at home and abroad, where North Carolina State University is US has put forward a new intelligent micro grid system-FREEDM(Future Renewable Electric Energy Delivery and Management).Based on advanced concepts of the FREEDM system, in this paper we put forward the internet structure energy micro network and do some research on it. Firstly, we interpret the idea of intelligent micro grid and then do some modeling and simulations for the distributed energy, stockpile equipment and the load.Secondly, by doing some simulations, modeling and analysis of the topology the solid state transformer, we put forward solid state transformer structure which is suitable for this project. The research on the solid state transformer at home is still in the beginning. In this paper, on the basis of the prior work of the others, we make some improvements for the traditional voltage and current double close-loop controller, furthermore, put forward a new controlling method.At last, we do some researching on the internet structure energy micro network controlling system, set up the simulation platform for the system and configure it with such parameters as energy, stored energy and load. We also research the function of DROOP in this system according to different loads and power as well as the energy balance control for the system due to the DROOP. By simulation, we figure out that internet structure energy micro network system has a better controlling capacity.