Improved microgrid energy storage device model in microgrid mode switching process

Microgrid has two operating modes, that is the state of being intergrated in external grid and the state of island operation, and can switch freely between the two states. As microgrid containing renewable energy power generations which are full of randomness and there is conflict that the randomness of micro source power supply and the randomness of users electricity need is temporal mismatch between the two sides, the key to solving this problem is the introduction of an energy storage device. Therefore, the study the energy storage device has played an extremely important role in microgrid study. With further microgrid research, a lot of simulation tools are used to explore the characteristics of microgrid and verify the effects of new proposed control means, one of which is digsilent, the software has a general energy storage device model. However, in the course of using the model it was found that the model does neither meet theoretical calculation results expectations nor conform to the actual situation under certain conditions, such as microgrid island operation or mode switching, the problem has been proposed and validated. After theoretical analysis, the method to improve the energy storage model is proposed, and its improved results are validated by simulation experiments, the results show that the new improved storage model is more consistent with theoretical expectations and realities than the original model.