Decentralized Control Strategy for an AC Co-Phase Traction Microgrid

Lan Ma, Yuhua Du, Leilei Zhu, Fan Yang, Shibiao Xiang and Zeliang Shu
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Lan Ma: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Yuhua Du: College of Engineering, Temple University, Philadelphia, PA 19122, USA
Leilei Zhu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Fan Yang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Shibiao Xiang: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Zeliang Shu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China

Energies, 2020, vol. 14, issue 1, 1-16

Abstract: High speed and heavy loads have become more prevalent in the traction power supply system recently. To ensure system operating stability, better power quality, and sufficient power capacity, improvements are needed over the conventional traction system. Inspired by the concept of a microgrid (MG), an AC co-phase traction MG system was proposed. Substations were connected to the traction grid as distributed generators operate in islanded mode. Droop control was adopted as the primary control to stabilize the system’s operating frequency and voltage. Considering the operating features of the substation and locomotive load, a de-centralized secondary control strategy was proposed for AC co-phase traction MG system operation with enhanced resiliency. The proposed control strategy could increase system stability and prevent circulation currents between substations. Moreover, the proposed de-centralized coordination between substations does not rely on communication, which promotes the system’s “plug-and-play” functionality. Stability analysis was undertaken and the proposed controller was proved to be exponentially stable. The dynamic response of the proposed controller was validated using comprehensive case studies in MATLAB/Simulink.

Keywords: circulation current; co-phased traction system; secondary control; microgrid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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