Stability analysis of digitally controlled dual active bridge converters

doi:10.1007/s40565-017-0317-9

Home > Archive>Volume 6, Issue 2, 2018 >375-383. DOI:10.1007/s40565-017-0317-9

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Stability analysis of digitally controlled dual active bridge converters

DOI:

10.1007/s40565-017-0317-9

Author:

Ling SHI
Ling SHI
State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China
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Wanjun LEI
Wanjun LEI
State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China
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Zhuoqiang LI
Zhuoqiang LI
State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China
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Yao CUI
Yao CUI
State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China
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Jun HUANG
Jun HUANG
State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China
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Yue WANG
Yue WANG
State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China
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Affiliation:

1. State Key Laboratory of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi’an Jiaotong University, Xi’an 710000, China

Fund Project:

This work was supported by National Natural Science Foundation of China (NSFC) (No. 51207126).

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Abstract:

The dual active bridge (DAB) converters are widely used in the energy storage equipment and the distributed power systems. However, the existence of switching nonlinearity and control delay can cause serious stability problem to the DAB converters. Thus, this paper, studies the stability of a digitally controlled DAB converter with an output voltage closed loop controller. Firstly, to accurately study the stability in a DAB converter, a discrete-time model established in a whole switching period is obtained. The model considers the output capacitor ESR, the digital control delay, and sample-and-hold process. By using this model, the stabilities of the DAB converter versus the proportional controller parameter and the output capacitor ESR are analyzed and the critical values are predicted accurately. Moreover, the stability boundary of the proportional controller parameter and the output capacitor ESR is also obtained. The result shows that the value of the output capacitor ESR can have a great effect on the stability region of the proportional controller parameter. Finally, the theoretical analyses are verified by the simulation and experimental results.

Key words:Dual active bridge (DAB), Discrete time modeling, Stability analysis, Dynamics

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Online: March 20,2018
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