Design and Analysis of Hybrid Power Systems with Variable Inertia Flywheel
Date Issued
2010
Date
2010
Author(s)
Su, Hung-Kuo
Abstract
The purpose of this study is to analyze and to develop the possible design concepts for the hybrid power systems with variable inertia flywheel. Through this study, we are able to synthesize and evaluate the hybrid systems and to compose of the hybrid power system with 1 engine, 1 flywheel and 1 engine, 1 flywheel, 1 electric machine. In the study, firstly, the “functional power graph” is developed, which can transform the traditional mechanical diagrams into a simplified graph for representing its mechanical structure and function. The atlases of structural graphs and functional power graph are built by a systematical design method, which includes all possible concepts of the hybrid power systems. The system for studying is 1 motor, 1 variable inertia flywheel which is used as the energy storage device, a planetary gear set, and a set of actuators. Then, the kinematic and kinetic equations of the hybrid power system are developed in order to establish the relationships of the speed and torque of all elements, and the specific speed and torque of the output can be found by using the software “ADVISOR” in various operation modes. Thus, with a prescribed mechanical brake energy recovery system model and a control model, a comprehensive analysis can be achieved. Finally, various driving modes, such as ECE, ECE+EUDC and New York Bus driving mode are investigated in order to demonstrate the characteristics of the hybrid power system. The numerical results show and conclude the effectiveness of the variable inertia flywheel, and the improvement on the efficiency of hybrid power systems.
Subjects
brake energy regeneration
hybrid power system
variable inertia flywheel
Type
thesis
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