go to top scroll for more

Projects: Projects for Investigator
Reference Number	NIA_NGTO030
Title	Overload Rotation to Increase Capacity of Transmission Boundaries
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 December 2018
End Date	31 July 2021
Duration	ENA months
Total Grant Value	£159,000
Industrial Sectors	Power
Region	London
Programme	Network Innovation Allowance
Investigators	Principal Investigator	Project Contact , National Grid Electricity Transmission (100.000%)
	Industrial Collaborator	Project Contact , National Grid plc (0.000%)
Web Site	https://smarter.energynetworks.org/projects/NIA_NGTO030
Objectives	It is envisaged that the capacity of transmission boundaries can be increased by overloading the individual boundary circuits for a limited time period and then reducing their loading whilst overloading other circuits in the next time period. This is the concept of rotating overloads across different circuits exploiting the existing overload ratings of the assets. This rotation of overloading may provide an effective increase in boundary power flows under normal and fault conditions. can be . The proposed method can be applied in both normal and emergency system operation. It consists of three main components:Dynamic thermal ratings of boundary circuits are used instead of nominal ratings.Overload rotation is done on individual boundary circuits to provide higher circuit capacity during a longer time period.Commercial aspects of generation rescheduling (for overload rotation) need to be investigated.It is expected that dynamic thermal ratings will be higher than the nominal ratings. This project will deliver the following work packages: WP1: Overload Rotation Model and Software: The Overload Rotation Model is a multi-stage mixed integer optimization model whose objective is to maximise power flows over boundary circuits in all time intervals by using the minimum amount of controllable actions. The model constraints are power flow equations, thermal and voltage limits. The control room ratings are used for all assets as nominal loading limits, whilst during emergencies boundary circuits are loaded up to dynamic thermal ratings that are produced in WP2. The overload rotation is realized by generation rescheduling, load curtailment and network switching. WP1 Deliverables at the end of the study period:Mathematical model and Matlab software for the Overload Rotation Model.Full specification of the network data required for the Overload Rotation Model.Results of the initial model testing on the standard IEEE reliability test network IEEE RTS-96.WP2: Dynamic Thermal Ratings of Boundary Circuits:WP2 investigates dynamic thermal ratings of boundary circuits. Dynamic thermal ratings are calculated using the IEC thermal balance model that takes into account external factors and loading conditions. Dynamic thermal ratings are input parameters in the Overload Rotation Model and are used as maximum loading limits of boundary circuits.WP2 Deliverables at the end of the study period Provide a range of dynamic thermal ratings of boundary circuits for different typical external conditions that prevail in the relevant geographical region.WP3: Testing of the Overload Rotation Model on National Grid Boundaries: Relevant boundaries and parts of the National Grid transmission network surrounding them are studied. The network models with all relevant data are provided by National Grid. The overload rotation is tested on up to three boundaries, where two boundaries can be geographically close to each other. Each boundary is studied under critical loading and network conditions.Capabilities of existing generation and load customers, as well as network switching are used to assess potential overloading of boundary circuits. Where these capabilities are deemed insufficient, connection of new generation, demand and energy storage customers is further investigated.WP3 Deliverable at the end of the study period:Capabilities of existing and new customers to deliver boundary circuit overloading.WP4: Commercial Aspects of Overload Rotation: This WP investigates commercial aspects of the overload rotation from both the societal and utility perspective. The societal benefit is the monetary value from deferred/avoided network investments. A utility will benefit from connection revenues contributed by the new customers who are willing to participate in the new ancillary service. A methodology to allocate (a part of) these benefits to existing and new customers needs to be developed, as well as incentive/reward regime.WP4 Deliverable at the end of the study period:A review of potential methodologies to apportion monetary benefits between utility and customers participating in the overload rotation; as overload rotation may require the participation of multiple parties. The objectives of this project is to determine the feasibility of overload rotation and quantify the benefits it can provide.
Abstract	It is envisaged that the capacity of transmission boundaries can be increased by overloading the individual boundary circuits for a limited time period and then reducing their loading whilst overloading other circuits in the next time period. This is the concept of rotating overloads across different circuits exploiting the existing overload ratings of the assets. This rotation of overloading may provide an effective increase in boundary power flows under normal and fault conditions. This is deemed appropriate because requirements for high power transfers are usually limited to 1 to 2 hours during system operation. On the other hand, in many European countries, overcurrent protection is set to 120% for, typically 20 minutes; this spare capacity can be used in the case of system.
Publications	(none)
Final Report	(none)
Added to Database	02/12/22