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A grid interface current control strategy for DC microgrids

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posted on 05.10.2021, 15:35 authored by Muhannad Alshareef, Zhengyu LinZhengyu Lin, Fulong Li, Fei Wang
In this paper, a grid interface current control strategy is presented for a DC microgrid, which aims to reduce the disturbance from PV generation and the load variation to the main grid without a grid interface converter. The grid interface current is directly controlled by a battery DC-DC converter within the DC microgrid. Based on a comprehensive analysis of the battery DCDC converter and interface current control, the control system has been mathematically modelled. This enabled two transfer functions to be derived that reflect the dynamic response of the inductor current to the duty cycle variation (inner loop), and the dynamic response of the grid interface current to the inductor current variation (outer loop). Experimental study has been done to assess the effectiveness of the proposed control strategy. The experimental results indicate that the proposed control strategy has a good performance to control the grid interface current without an interface converter, regardless the variations of both PV and the load conditions.

Funding

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 programme under grant agreement No.734796

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

CES Transactions on Electrical Machines and Systems

Volume

5

Issue

3

Pages

249-256

Publisher

China Electrotechnical Society (CES) and the Institute of Electrical Engineering of the Chinese Academy of Sciences

Version

VoR (Version of Record)

Rights holder

© CES

Publisher statement

This is an Open Access Article.

Acceptance date

09/03/2021

Publication date

2021-09-28

Copyright date

2021

ISSN

2096-3564

Language

en

Depositor

Dr Zhengyu Lin. Deposit date: 10 September 2021

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