Redesign of the DAB converter with considerations of its stability issue

Modularization and unitization of electrical power conversion devices have become new development trends. The dual active bridge (DAB) converter is a typical sub-module, which is widely applied in distributed power supply to provide the required power interface form for smart interconnected grid. H...

Full description

Saved in:
Bibliographic Details
Main Author: Zhang, Shuying
Other Authors: Jack Zhang Xin
Format: Final Year Project
Language:English
Published: 2019
Subjects:
Online Access:http://hdl.handle.net/10356/78789
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-78789
record_format dspace
spelling sg-ntu-dr.10356-787892023-07-07T16:33:19Z Redesign of the DAB converter with considerations of its stability issue Zhang, Shuying Jack Zhang Xin School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering::Power electronics Modularization and unitization of electrical power conversion devices have become new development trends. The dual active bridge (DAB) converter is a typical sub-module, which is widely applied in distributed power supply to provide the required power interface form for smart interconnected grid. However, there are still many problems to be solved in actual use. When the DAB converter operates individually, the control method may influence the stability. Furthermore, another key issue is due to the existence of the impedance interaction, the cascaded converter systems often suffer instability, although the DAB converters have been designed separately for stable operation previously. Therefore, the aim of the project is to study the stability issue of DAB converter. Focusing on the DAB converter controlled by single phase-shift mode, firstly, the minor loop gain T is obtained from the matrix forms of some significant variables in DAB converter by using the MATLAB, and lately, the Nyquist plots of T is analyzed to judge if the system is stable. And then by modeling the PID converter, the parameters design guideline is set. Finally, the stability analysis is verified by the simulation results. In addition, in order to address the stability problem of the DAB converter cascaded system, the impedance model is utilized. The input impedance of the load system should always exceed the peak output impedance of the source converter, which is required by the Middlebrook’s impedance criterion. And concurrently the resonant parameters are determined to proceed the simulation. Eventually, the impedance model and stability analysis are demonstrated by the simulation results. Bachelor of Engineering (Electrical and Electronic Engineering) 2019-06-28T01:00:44Z 2019-06-28T01:00:44Z 2019 Final Year Project (FYP) http://hdl.handle.net/10356/78789 en Nanyang Technological University 41 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering::Power electronics
spellingShingle Engineering::Electrical and electronic engineering::Power electronics
Zhang, Shuying
Redesign of the DAB converter with considerations of its stability issue
description Modularization and unitization of electrical power conversion devices have become new development trends. The dual active bridge (DAB) converter is a typical sub-module, which is widely applied in distributed power supply to provide the required power interface form for smart interconnected grid. However, there are still many problems to be solved in actual use. When the DAB converter operates individually, the control method may influence the stability. Furthermore, another key issue is due to the existence of the impedance interaction, the cascaded converter systems often suffer instability, although the DAB converters have been designed separately for stable operation previously. Therefore, the aim of the project is to study the stability issue of DAB converter. Focusing on the DAB converter controlled by single phase-shift mode, firstly, the minor loop gain T is obtained from the matrix forms of some significant variables in DAB converter by using the MATLAB, and lately, the Nyquist plots of T is analyzed to judge if the system is stable. And then by modeling the PID converter, the parameters design guideline is set. Finally, the stability analysis is verified by the simulation results. In addition, in order to address the stability problem of the DAB converter cascaded system, the impedance model is utilized. The input impedance of the load system should always exceed the peak output impedance of the source converter, which is required by the Middlebrook’s impedance criterion. And concurrently the resonant parameters are determined to proceed the simulation. Eventually, the impedance model and stability analysis are demonstrated by the simulation results.
author2 Jack Zhang Xin
author_facet Jack Zhang Xin
Zhang, Shuying
format Final Year Project
author Zhang, Shuying
author_sort Zhang, Shuying
title Redesign of the DAB converter with considerations of its stability issue
title_short Redesign of the DAB converter with considerations of its stability issue
title_full Redesign of the DAB converter with considerations of its stability issue
title_fullStr Redesign of the DAB converter with considerations of its stability issue
title_full_unstemmed Redesign of the DAB converter with considerations of its stability issue
title_sort redesign of the dab converter with considerations of its stability issue
publishDate 2019
url http://hdl.handle.net/10356/78789
_version_ 1772828603893940224