Design issues of hybrid power supply systems

• Main Author: Wang, Gucheng
• Other Authors: Wang Youyi
• Format: Theses and Dissertations
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Electric power::Auxiliaries, applications and electric industries
• Online Access: https://hdl.handle.net/10356/51127
• Institution: Nanyang Technological University

With increasing concerns of energy crisis, renewable energies such as photovoltaic generation, wind energy and fuel cell have caused great attention to researchers and engineers. However, such energy systems -cannot satisfy users’ need individually resulted from the effect of environment or dynamic response, etc. Hybrid power supply systems have been widely studied and considered as a promising solution, which have been extensively used on portable electronics, hybrid electric vehicles, photovoltaic generation substation, etc. These hybrid power supply system make the best use of their operating characteristics, and obtain higher efficiencies than those systems which consist of a single power source. But these hybrid power supply systems’ topologies are in parallel and many power converters are used; this may result to the intricateness of the controller and decrease the system’s stability. In this thesis, a Multiple Input Hybrid Converter (MIHC) topology is proposed. The small signal modeling of the MIHC was built in the study. The energy management strategy for the MIHC, which has considered the actual vehicle operation cases and the most serious situation, was also developed. Based on MATLAB/SIMULINK, the proposed topology is simulated. In Chapter 4, a testing platform of PEM fuel cell/battery hybrid power supply system for the proposed MIHC topology is developed to verify the correctness of the presented theory and design. The simulation and experimental results have shown the feasibility and priority of the proposed MIHC topology. In the advanced research, a modified MIHC is developed to achieve regenerative function. To validate the practical performance of the proposed topology, a hybrid system with battery and ultra-capacitor as power sources, is developed and applied on an electric bicycle based on the modified MIHC. In order to improve the performance of the battery stack’s discharge capacity and prolong its lifetime, a battery equalization system is also studied and applied in the simulation and experiment setup.