Applying Used Electric Vehicle Battery in DC Microgrid Operations

• Main Authors: Min-Jui Chen, 陳敏睿
• Other Authors: Chan-Nan Lu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/50978737453256866283

碩士 === 國立中山大學 === 電機工程學系研究所 === 102 === Power system may fail or go unstable due to either man-made or natural reasons. Some of the reliability problems can be solved by implementing distributed energy generator, such as solar photovoltaic and wind farm in the grid. Using high capacity energy storage system with renewable generator is an effective but expensive approach. In order to reduce the investment cost of energy storage system, used EV batteries are proposed. Once batteries have reached the end of their useful life in vehicles, at around 70% to 80% of initial capacity, placing them into a localized energy storage system will extend their lifetime usage and further reduce the cost on distributed generators integration. In this thesis, an isolated DC power system including solar photovoltaic and used EV batteries is investigated. Batteries with different state of health (SOH) would have different power capacity. Discharging rates of multiple batteries with different SOH are investigated in order to achieve the largest energy output or highest efficiency of storage system. Using the obtained battery discharging ratios, the parameters in the proposed DC microgrid droop control can be obtained. Dynamic simulations of the DC microgrid operations are presented.