A Li-Ion Battery/Ultracapacitor Hybrid Power System for Electric Motorcycles

• Main Authors: Han-Tse Kuo, 郭漢澤
• Other Authors: Wei-Song Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/06155407508252380882

碩士 === 國立臺灣大學 === 電機工程學研究所 === 102 === This thesis presents a design of Li-ion battery/ultracapacitor hybrid power system for electric motorcycles. The hybrid power system consists of a dc/dc converter for controlling electrical current out of the battery, and another dc/dc converter for controlling electrical current out of the ultracapacitor. The energy management strategy directs the power-split controller to manipulate the duty cycles of the converters that splits load power for the battery and ultracapacitor. The energy management tries to constrain battery’s discharge and charge currents, assign urgent load power to the ultracapacitor, and maintain the state-of-charge of the ultracapacitor within permissible range. The hybrid power system is tested respectively with a pulse train, a stepwise function, and a driving cycle of an EM50 electric motorcycle. The simulation results show that the magnitudes of current and change rate of current of the battery satisfy the specifications and no harm occurs on the battery. The state-of-charge of the ultracapacitor retains within the permissible range that makes the ultracapacitor capable of supplying urgent power or retrieving regenerated power at any moment. It is shown that neither passive design nor semi-active design can achieve similar performance under the same test conditions.