| Author: | Kong, Liting |
| Title: | Power conversion techniques for energy storage systems |
| Degree: | M.Sc. |
| Year: | 2014 |
| Subject: | Energy storage. Electric current converters. Hong Kong Polytechnic University -- Dissertations |
| Department: | Faculty of Engineering |
| Pages: | xvii, 99 leaves : ill. (some col.) ; 30 cm. |
| Language: | English |
| Abstract: | Energy storage systems (ESS) are becoming essential in future power applications, such as automobile applications, renewable generation systems and uninterruptable power supply (UPS). In an energy storage system, bidirectional DC-DC converter (BDC) is one of the key components to interface the DC bus and energy storage devices. Growing applications of ESS call for more and more advanced power conversion techniques. A comprehensive review of bidirectional topologies and soft switching techniques is presented at the beginning of this dissertation. Among the popular bidirectional topologies, phase-shift controlled Dual Active Bridge (DAB) converters are available with galvanic isolation, low components stresses, constant switching frequency operation, inherent zero-voltage switching (ZVS), low number of passive components and easy implementation. Therefore, DAB is very suitable for high-power and high-voltage applications. By using low on-state resistance MOSFETs on the low-voltage side, high efficiency is still achievable for low-power or low-voltage applications. However, the design of DAB is not straightforward. The rest of this dissertation intends to conduct a comprehensive study of DAB, including DC characteristics, ZVS conditions, small-signal modeling, closed-loop control design and implementation. To verify the theoretical analysis, the DAB is simulated by using Saber. A prototype of DAB is built and tested. A novel control configuration is proposed to implement bidirectional power flow. The design utilizes two phase-shift controllers, which are alternatively working to control the corresponding direction of power. Experiment results demonstrate that the proposed configuration can effectively control the bidirectional power flow. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b26795334.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.85 MB | Adobe PDF | View/Open |
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