A Li-Ion Battery/Ultracapacitor Hybrid Power System for Electric Motorcycles
Date Issued
2014
Date
2014
Author(s)
Kuo, Han-Tse
Abstract
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.
Subjects
電動機車
車用混合儲電系統
能量管理策略
雙向直流對直流轉換器
鋰 離子電池
超電容
Type
thesis
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