Issue |
Sci. Tech. Energ. Transition
Volume 77, 2022
|
|
---|---|---|
Article Number | 22 | |
Number of page(s) | 15 | |
DOI | https://doi.org/10.2516/stet/2022019 | |
Published online | 20 December 2022 |
Regular Article
Decentralized control of islanding/grid-connected hybrid DC/AC microgrid using interlinking converters
Indian Institute of Technology Roorkee, Haridwar 247667, India
* Corresponding author: t.diress@yahoo.com
Received:
1
April
2022
Accepted:
7
October
2022
This paper presents decentralized control of an islanding/grid-connected DC/AC hybrid microgrid (μG) using battery energy storage system (BESS) and distributed energy resource (DER). In DC/AC μG unified with different DERs and BESS, the intermittent output nature of DERs due to fluctuating input characteristics and strong interaction of sources, loads, and primary grid, causes variations in frequency and bus voltage. To solve these issues, the paper proposes a decentralized control method which incorporates active/reactive power (P/Q) control, DC virtual droop control, voltage control, frequency droop control, current control, maximum power point tracking, and a phase-locked loop (PLL). The coordination and integration of various control parameters will ensure a smooth transition as well as the overall stability of the system. The BESS and DER’s interfacing converters are autonomously controlled in this control scheme without communication using the frequency droop and bus voltage control. Correspondingly, the control techniques comprehend different operating modes depending on the state of charge of BESS, distributed generation, and grid. During switching the two interlinking converters (IC), high-frequency harmonics are created, which are eventually mitigated by the inductor-capacitor-inductor (LCL) filters employed in the AC bus. Virtual droop control will ensure active damping of the harmonics in the LCL network. The maximum power transfer in interlinking converters (ICs) is improved using the proposed approach for input-source variations. Simulations were performed using MATLAB/Simulink and verified using the hardware in the loop (HIL) to prove the effectiveness of the control scheme proposed.
Key words: DC/AC microgrid / Decentralized control / Distributed energy resource / Frequency droop control / MPPT / P/Q control
© The Author(s), published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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