19-05-2014, 04:57 PM
Study on protection Scheme for Micro-grid with Mobile Energy Storage Units
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Abstract
A method of dividing complex micro-grid into minor micro-grids and finally to the minimal micro-grid which
consists of one AC bus or one DC bus is presented according to classification principles. The protection scheme of
minimal micro-grid is discussed and then applied to the whole micro-grid. By analyzing parallel operation mode and
islanding operation mode of micro-grid, the protection scheme of each mode is given respectively.
© 2010 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Society for
Automobile, Power and Energy Engineering
Introduction
Building charging stations of electric vehicles is an important way to promote energy conservation and
low-carbon cost economy, and is a pilot project of construction of Strong Smart Grid. The energy storage
unit in an electric vehicle is mainly car batteries, so the electric vehicle can be called mobile energy storage
unit. Smart Grid calls for self-healing, interaction, compatibility, exchange of information etc, and
compatibility contains the access of renewable energy which needs the support of energy storage. Electric
vehicle, acting as the mobile energy storage unit, can interact with grid. With the mature technology and
the rapid increase in the number of electric vehicles and charging stations, V2G (Vehicle to Grid) has a
bright future. As a major part of V2G, mobile distributed energy storage units, which can realize user
participation and power interactivity, become the trend of developing future grid. Research on the charger
with high efficiency, high power factor, low harmonic content and two-way power flow, as well as the
intelligent charging stations that are efficient, safe, convenient, and compatible are becoming focused
gradually.
Conclusion
Complex micro-grid can be subdivided into several levels of minor micro-grids until the minimal
micro-grids. AC bus or DC bus minimal micro-grid can be regarded as load or bi-directional source when
setting the protection scheme of entire micro-grid. The complex micro-grid protection scheme can be like
the protection scheme of minimal micro-grid.