Power conversion techniques for energy storage systems

Pao Yue-kong Library Electronic Theses Database

Power conversion techniques for energy storage systems


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
InnoPac Record: http://library.polyu.edu.hk/record=b2679533
URI: http://theses.lib.polyu.edu.hk/handle/200/7392
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.

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