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Embedding OFDM-based carrier communication into power control loop of converter in DC microgrids

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journal contribution
posted on 15.07.2021, 10:28 by Ruoqi Zhang, Yue Hui, Jiande Wu, Ruichi WangRuichi Wang, Zhengyu LinZhengyu Lin, Xiangning He
In direct current (DC) microgrids, communication between converters is necessary for better power distribution and finer energy scheduling. This paper proposes an orthogonal frequency division multiplexing (OFDM)-based carrier communication method for DC microgrid applications. The method integrates the communication function in the process of power conversion by modulating data into power control loop. To maximize the communication rate in a narrow band limited by PWM control, OFDM technology is applied in the data modulation process. The data is modulated to multiple low-frequency signal carriers, then the modulated wave is added to the output of the power control loop. Since no additional component is needed for sending data, this method has the advantages of low cost and simple implementation. In order to provide theoretical guidance for system design, the DC microgrid applying the proposed method is modeled. Furthermore, important issues of the communication system are discussed, including data frame for at and inter-symbol interference (ISI) problem. At last, a 2 kW DC microgrid experimental platform is established and 9.6 kbps communication rate with a transmission distance of 200 m is achieved, which verifies the feasibility of the proposed method.

Funding

National Natural Science Foundation of China (51977189)

Plug-and-play Low Voltage DC Microgrid for Cheap and Clean Energy

Engineering and Physical Sciences Research Council

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European Union’s Horizon 2020 research and innovation program (898194)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Transactions on Industrial Electronics

Volume

69

Issue

7

Pages

6914 - 6924

Publisher

Institute of Electrical and Electronics Engineers

Version

AM (Accepted Manuscript)

Rights holder

© IEEE

Publisher statement

© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Acceptance date

22/06/2021

Publication date

2021-07-14

Copyright date

2021

ISSN

0278-0046

eISSN

1557-9948

Language

en

Depositor

Dr Zhengyu Lin. Deposit date: 30 June 2021