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Modular multilevel converter with partially rated integrated energy storage suitable for frequency support and ancillary service provision

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Title: Modular multilevel converter with partially rated integrated energy storage suitable for frequency support and ancillary service provision
Authors: Judge, P
Green, TC
Item Type: Journal Article
Abstract: Grid scale Energy Storage Systems (ESSs) have received significant interest in recent years due to their ability to reduce/defer investment in transmission/distribution networks, as well their ability to act as primary reserve sources and provide emergency support to the transmission system. This paper investigates the dual-purposing of a HVDC-Scale Modular Multilevel Converter (MMC), allowing it to also act as an ESS. This has potential application in primary frequency response provision and other services such as de-coupled power oscillation damping. In the proposed topology a certain percentage of submodules (SM) within the MMC have their capacitor interfaced through a DC-DC converter to an Energy Storage Element (ESE), formed of a battery or ultracapacitor. By applying appropriate control, energy can be exchanged from the ESE to the main SM capacitor of each ESE-SM, and from there to either the AC or DC bus. It was found that for some operating points, an injection of circulating current was required to facilitate exchanging energy with the ESE-SMs. Analysis shows that, for instance, an additional power injection to AC or DC terminal of 0.1 p.u. (10%) is possible with only 4% of the SMs replaced by Full-Bridge ESE-SMs, and no additional SMs added.
Issue Date: 1-Feb-2019
Date of Acceptance: 3-Oct-2018
URI: http://hdl.handle.net/10044/1/65211
DOI: https://dx.doi.org/10.1109/TPWRD.2018.2874209
ISSN: 0885-8977
Publisher: Institute of Electrical and Electronics Engineers
Start Page: 208
End Page: 219
Journal / Book Title: IEEE Transactions on Power Delivery
Volume: 34
Issue: 1
Copyright Statement: © 2018 The author(s). This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EEZ1419554
Keywords: Science & Technology
Engineering, Electrical & Electronic
DC-AC power converters
energy Storage
flexible AC transmission systems
frequency control HVDC transmission
Power Electroics
Energy Storage
0906 Electrical And Electronic Engineering
Publication Status: Published
Online Publication Date: 2018-10-18
Appears in Collections:Faculty of Engineering