Application of superconducting flywheel energy storage system to inertia-free stand-alone microgrid

Sun Ho Bae, Dong Hee Choi, Jung Wook Park, Soo Hyoung Lee

Research output: Contribution to journalArticle

Abstract

Recently, electric power systems have been operating with tight margins and have reached their operational limits. Many researchers consider a microgrid as one of the best solutions to relieve that problem. The microgrid is generally powered by renewable energies that are connected through power converters. In contrast to the rotational machines in the conventional power plants, the converters do not have physical rotors, and therefore they do not have rotational inertia. Consequently, a stand-alone microgrid has no inertia when it is powered by the only converter-based-generators (CBGs). As a result, the relationship between power and frequency is not valid, and the grid frequency cannot represent the power balance between the generator and load. In this paper, a superconducting flywheel energy storage system (SFESS) is applied to an inertia-free stand-alone (IFSA) microgrid. The SFESS accelerates or decelerates its rotational speed by storing or releasing power, respectively, based on its rotational inertia. Then, power in the IFSA microgrid can be balanced by measuring the rotor speed in the SFESS. This method does not have an error accumulation problem, which must be considered for the state of charge (SOC) estimation in the battery energy storage system (BESS). The performance of the proposed method is verified by an electromagnetic transient (EMT) simulation.

Original languageEnglish
Pages (from-to)1442-1448
Number of pages7
JournalJournal of Electrical Engineering and Technology
Volume12
Issue number4
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Flywheels
Energy storage
Rotors
Power converters
Electric power systems
Power plants

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

@article{5e2ee1c570894b4c9221ed4d70914704,
title = "Application of superconducting flywheel energy storage system to inertia-free stand-alone microgrid",
abstract = "Recently, electric power systems have been operating with tight margins and have reached their operational limits. Many researchers consider a microgrid as one of the best solutions to relieve that problem. The microgrid is generally powered by renewable energies that are connected through power converters. In contrast to the rotational machines in the conventional power plants, the converters do not have physical rotors, and therefore they do not have rotational inertia. Consequently, a stand-alone microgrid has no inertia when it is powered by the only converter-based-generators (CBGs). As a result, the relationship between power and frequency is not valid, and the grid frequency cannot represent the power balance between the generator and load. In this paper, a superconducting flywheel energy storage system (SFESS) is applied to an inertia-free stand-alone (IFSA) microgrid. The SFESS accelerates or decelerates its rotational speed by storing or releasing power, respectively, based on its rotational inertia. Then, power in the IFSA microgrid can be balanced by measuring the rotor speed in the SFESS. This method does not have an error accumulation problem, which must be considered for the state of charge (SOC) estimation in the battery energy storage system (BESS). The performance of the proposed method is verified by an electromagnetic transient (EMT) simulation.",
author = "Bae, {Sun Ho} and Choi, {Dong Hee} and Park, {Jung Wook} and Lee, {Soo Hyoung}",
year = "2017",
month = "1",
day = "1",
doi = "10.5370/JEET.2017.12.4.1442",
language = "English",
volume = "12",
pages = "1442--1448",
journal = "Journal of Electrical Engineering and Technology",
issn = "1975-0102",
publisher = "Korean Institute of Electrical Engineers",
number = "4",

}

Application of superconducting flywheel energy storage system to inertia-free stand-alone microgrid. / Bae, Sun Ho; Choi, Dong Hee; Park, Jung Wook; Lee, Soo Hyoung.

In: Journal of Electrical Engineering and Technology, Vol. 12, No. 4, 01.01.2017, p. 1442-1448.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Application of superconducting flywheel energy storage system to inertia-free stand-alone microgrid

AU - Bae, Sun Ho

AU - Choi, Dong Hee

AU - Park, Jung Wook

AU - Lee, Soo Hyoung

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Recently, electric power systems have been operating with tight margins and have reached their operational limits. Many researchers consider a microgrid as one of the best solutions to relieve that problem. The microgrid is generally powered by renewable energies that are connected through power converters. In contrast to the rotational machines in the conventional power plants, the converters do not have physical rotors, and therefore they do not have rotational inertia. Consequently, a stand-alone microgrid has no inertia when it is powered by the only converter-based-generators (CBGs). As a result, the relationship between power and frequency is not valid, and the grid frequency cannot represent the power balance between the generator and load. In this paper, a superconducting flywheel energy storage system (SFESS) is applied to an inertia-free stand-alone (IFSA) microgrid. The SFESS accelerates or decelerates its rotational speed by storing or releasing power, respectively, based on its rotational inertia. Then, power in the IFSA microgrid can be balanced by measuring the rotor speed in the SFESS. This method does not have an error accumulation problem, which must be considered for the state of charge (SOC) estimation in the battery energy storage system (BESS). The performance of the proposed method is verified by an electromagnetic transient (EMT) simulation.

AB - Recently, electric power systems have been operating with tight margins and have reached their operational limits. Many researchers consider a microgrid as one of the best solutions to relieve that problem. The microgrid is generally powered by renewable energies that are connected through power converters. In contrast to the rotational machines in the conventional power plants, the converters do not have physical rotors, and therefore they do not have rotational inertia. Consequently, a stand-alone microgrid has no inertia when it is powered by the only converter-based-generators (CBGs). As a result, the relationship between power and frequency is not valid, and the grid frequency cannot represent the power balance between the generator and load. In this paper, a superconducting flywheel energy storage system (SFESS) is applied to an inertia-free stand-alone (IFSA) microgrid. The SFESS accelerates or decelerates its rotational speed by storing or releasing power, respectively, based on its rotational inertia. Then, power in the IFSA microgrid can be balanced by measuring the rotor speed in the SFESS. This method does not have an error accumulation problem, which must be considered for the state of charge (SOC) estimation in the battery energy storage system (BESS). The performance of the proposed method is verified by an electromagnetic transient (EMT) simulation.

UR - http://www.scopus.com/inward/record.url?scp=85020862318&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020862318&partnerID=8YFLogxK

U2 - 10.5370/JEET.2017.12.4.1442

DO - 10.5370/JEET.2017.12.4.1442

M3 - Article

VL - 12

SP - 1442

EP - 1448

JO - Journal of Electrical Engineering and Technology

JF - Journal of Electrical Engineering and Technology

SN - 1975-0102

IS - 4

ER -