Implementation of An Isolated Multi-Input Power Converter with Battery Energy Storage

• Main Authors: Cheng-Wei Hsu, 許正煒
• Other Authors: Tsair-Rong Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/16652165576358059377

碩士 === 國立彰化師範大學 === 電機工程學系 === 101 === The major object of this thesis is to develop an isolated multi-input converter for the renewable energy and grid hybrid power system. A lead acid battery tank is used as the energy storage of the power system. The developed isolated multi-input converter is derived from the flyback dc converter for low number of active switches and isolation between each power sources. A multi-windings transformer is adopted in the converter. The renewable energy, grid and lead acid battery tank are connected to the three primary side windings respectively. The only one secondary winding is connected to the load. Moreover, a relay is integrated into the lead acid battery side for bidirectional power flow. While the output power to the load is not required, the renewable energy can continuously deliver the power to the battery energy storage. Then, the energy stored in the battery tank can be transferred to the load at the next output power requirement. Therefore, the utilization of the renewable energy can be further improved. In this thesis, the operation modes of the multi-input converter are analyzed firstly. A prototype with 400W rated output power is practically constructed to verify the validity of the converter. The measured efficiency under 400W output power is about 80%. The constant current/ constant voltage charging testing is also carried out to verify that the multi-input converter can be operated at battery charging mode to store the additional renewable energy while the load is not requesting.