Study On The Application Of Energy Storage Technology In Microgrid

With the constant progress of material technology and the rapid development of power electronic technology, various performance indexes for an energy storage device such as the capacity, the response speed, the power density and efficiency, etc. have made great progress, so the properties of energy storage device gets great improvements. The development of modern control theory makes the control of energy storage device easier and more flexible and the application field of energy storage device becomes more widely. In this paper, the ways, functions and feasibility of energy storage devices applied in microgrid are studied.Firstly, this paper studies the principle and structures of microgrid and summarizes technical requirements of each part of a microgrid and expounds the significance of microgrid in solving the existing problems of power system. This paper also analyzes the importantance of energy storage technology in microgrid, and gaves a detailed description of energy storage device applied in microgrid. The present development of energy storage technology is introduced and the advantages and disadvantages of various energy storage technologies are compared.Secondly, this paper studies the principles and structures of energy storage technology and sets up unified models of energy storage system based on comparing the common points of different energy storage devices. This paper studies the applications and feasibility for an energy storage system to be used in microgrids as micro power sources and energy storage devices, and gaves the application patterns of energy storage system used in microgrid and achieves a conclusion that there is no problem for an energy storage system to be used in microgrid. This paper designs the correspongding control system and studies capacity selection of energy storage system in microgrid and matching between different energy storage devices. Finally, taking SMES as an example, the energy storage system applied particularly in microgrid is tested by digital simulation in the environment of MATLAB/Simulink. This paper tests the properties of superconducting tapes and studies the properties of SMES and builds the SMES models and control systems. This paper studies how SMES can improve the voltage at the load terminal and how SMES can inhibit power oscillations in Microgrid by digital simulation. In this paper, the impacts of SMES parameters on Power Quality improving are studied, the effect of SMES application in microgrid is evaluated and we get a conclusion that SMES could be used in microgrid very well.