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Projects: Projects for Investigator
Reference Number NIA_NGET0161
Title Detection and control of inter-area oscillations (DACIAO)
Status Completed
Energy Categories Other Power and Storage Technologies(Electricity transmission and distribution) 100%;
Research Types Applied Research and Development 100%
Science and Technology Fields ENGINEERING AND TECHNOLOGY (Electrical and Electronic Engineering) 100%
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Project Contact
No email address given
National Grid Electricity Transmission
Award Type Network Innovation Allowance
Funding Source Ofgem
Start Date 01 October 2015
End Date 01 October 2018
Duration 36 months
Total Grant Value £300,000
Industrial Sectors Power
Region London
Programme Network Innovation Allowance
Investigators Principal Investigator Project Contact , National Grid Electricity Transmission (100.000%)
Web Site http://www.smarternetworks.org/project/NIA_NGET0161
Objectives The intended outputs of this project would be: -Improved understanding of inter-area mode phenomena Development of a method and analysis package capable of identification of existing low magnitude inter-area modes and providing early warning of the onset of their severity Appraisal and assessment of control options and the methodologies surrounding their application on the GB transmission system. The detection method identifies oscillatory events that are currently observed The analysis approach is able to highlight the risk of any inter-area modes developing The control strategy (or strategies) can be demonstrated to have the capability to successfully limit the observed oscillations and approaches to responding flexibly to new modes/ optimally setting the control system at the design side are identified.
Abstract An inter-area oscillation on the GB network has been seen at times between England and Scotland, with a frequency of about 0. 5Hz. It is managed by using transient stability programs like DigSilent and the power system stabilisers and other controllers of existing plant on the system have been designed so as to provide a damped response to this inter-area oscillation. As noted in National Grid’s System Operability Framework (SOF), Synchronous Generation will inherently respond to naturally damp oscillation away from 50Hz given the synchronous torque, related to these machines’ inertia which is continuously applied to the transmission system from these power stations. As such, at present it requires an extreme combination of power flow and network depletion scenario to provoke an inter-area mode on the GB Transmission system. As shown in all Future Energy Scenarios (FES) and in the analysis contained within the SOF, as the GB network accommodates greater levels of connection and penetration of Non-Synchronous Generation (for example wind power and HVDC imports from Europe), this reduces the levels of Synchronous Generation available to damp frequency oscillation, and it is expected that further new inter-area oscillations may emerge, for example between Cornwall and East Anglia and that inter-area modes will become more noticeable and dangerous, given the lack of the presence of any corrective action upon the system attuned to these modes. It is essential to detect these before they become serious and to design control strategies that are capable of handling more than half a dozen modes simultaneously. Detection: Utilising mathematical theories concerning complex perturbation theory and signal identification, we will develop a novel approach founded upon Bayesian methods to identify significant oscillatory signals in phasor measurement unit data and the manner of their evolution. These will be like phonemes - identified in time, frequency and amplitude - but also with a spatial mode structure. We will from this describe the range of control space defined from current network dynamics. The intent of such work will be to construct models, which based on the outputs from Wide Area Monitoring can identify the first signs of new inter-area mode evolution. Control: Based on the inferred mode structure, we will develop a model for the relevant parts of the electricity network and determine what changes could be implemented to limit the oscillations. We will examine a variety of designed and responsive control approaches that might be applied to power electronic controllers and seek to develop a flexible approach capable of responding to multiple modal behaviours in the future system, including the potential for modes as yet unidentified.Note : Project Documents may be available via the ENA Smarter Networks Portal using the Website link above
Publications (none)
Final Report (none)
Added to Database 09/08/18