Dynamic overload capability of VSC HVDC interconnections for frequency support
File(s)
Published version
OA Location
Author(s)
Martinez Sanz, I
Judge, P
Spallarossa, C
Chaudhuri, B
Green, T
Type
Journal Article
Abstract
In future power systems, reduced overall inertia caused by an increased dominance of asynchronous generation and interconnections would make frequency control particularly challenging. As the number and power rating of voltage source converter (VSC) HVDC systems increases, network service provision would be expected from such systems and to do so would require overload capacity to be included in the converter specifications. This paper studies the provision of frequency services from modular multilevel converter (MMC)-based VSC HVDC interconnections using temperature-constrained overload capability. Overload of the MMC-based HVDC system is achieved through controlled circulating currents, at the expense of higher losses, and subject to a control scheme that dynamically limits the overload available in order to keep the semiconductor junction temperatures within operational limits. Two frequency control schemes that use the obtained overload capacity to provide frequency response during emergency conditions are investigated. The controllers' performance is demonstrated in the context of the future Great Britain transmission grid through a reduced equivalent test system. Simulation results show that even modest temperature margins which allow overload of MMC-based HVDC systems for a few seconds are effective as a primary frequency reserve and also reduce the loss of infeed requirements of such interconnections.
Date Issued
2017-12-01
Date Acceptance
2017-05-29
Citation
IEEE Transactions on Energy Conversion, 2017, 32 (4), pp.1544-1553
ISSN
0885-8969
Publisher
Institute of Electrical and Electronics Engineers
Start Page
1544
End Page
1553
Journal / Book Title
IEEE Transactions on Energy Conversion
Volume
32
Issue
4
Copyright Statement
This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Identifier
https://ieeexplore.ieee.org/document/7972971
Grant Number
EP/N030028/1
EEZ1419554
Subjects
Science & Technology
Technology
Energy & Fuels
Engineering, Electrical & Electronic
Engineering
Frequency control
HVDC
modular multilevel converters (MMC)
power system dynamics
VSC overload
POWER
SYSTEM
0906 Electrical and Electronic Engineering
Electrical & Electronic Engineering
Publication Status
Published
Date Publish Online
2017-07-10