Model-Free Power Control for Low-Voltage AC Dispatchable Microgrids with Multiple Points of Connection

Geovane dos Reis, Eduardo Liberado, Fernando Marafão, Clodualdo Sousa, Waner Silva and Danilo Brandao
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Geovane dos Reis: Instituto de Ciências Tecnológicas (ICT), Campus Itabira, Universidade Federal de Itajubá (UNIFEI), Itabira 35903-087, Brazil
Eduardo Liberado: Campus of Rosana, São Paulo State University (UNESP), Rosana 19273-000, Brazil
Fernando Marafão: Campus of Sorocaba, São Paulo State University (UNESP), Sorocaba 18087-180, Brazil
Clodualdo Sousa: Instituto de Ciências Tecnológicas (ICT), Campus Itabira, Universidade Federal de Itajubá (UNIFEI), Itabira 35903-087, Brazil
Waner Silva: Instituto de Ciências Tecnológicas (ICT), Campus Itabira, Universidade Federal de Itajubá (UNIFEI), Itabira 35903-087, Brazil
Danilo Brandao: Graduate Program in Electrical Engineering, Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, Brazil

Energies, 2021, vol. 14, issue 19, 1-20

Abstract: This paper proposes a modified version of the power-based control (MPBC) applied to microgrids (µGs) with multiple points of connection (i.e., utility grid itself or any other neighboring µG). Using the MPBC, single-phase distributed energy resources (DERs) arbitrarily connected between the phases share the amounts of balanced power, while the unbalanced and homopolar power are steered only to the line-to-neutral inverters. The control technique is based on a three-level hierarchical control using narrow bandwidth, low data rate communication that properly coordinates the DERs connected to three-phase four-wire µGs. The MPBC allows the DERs to steer power flow at any of the multiple points of common coupling of a multi-PCC dispatchable µG. The modified control proposed herein is evaluated through simulation results using MATLAB/SIMULINK considering a real urban distribution grid with typical operational elements and conditions. When compared to the original power-based control (PBC), results show that a meshed µG may reach power benchmarks with accommodation time 80% lower when applying MPBC. Moreover, it may also lead to significant power loss reduction (about of 5%) in some studied cases.

Keywords: dispatchable microgrids; multi-PCC microgrids; hierarchical control; power sharing (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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