In the NEM, notional interconnectors are used to provide a simple radial link representation of all the individual transmission lines that form the physical interconnection between two regional reference nodes. Dynamic inter-regional loss factor equations, defined in terms of the interconnector flow and key power system variables, are used to define the interconnector marginal loss factors for the current operating conditions. These equations are defined in Region Boundaries and Marginal Loss Factors for the NEM.
The losses on each notional interconnector can be determined by integrating the inter-regional loss factor equations (MLF-1). This approach is described in the above reference.
The inter-regional surplus is calculated by considering the energy transfers related to the notional interconnectors at each regional reference node. This is not a simple task as flows are generally measured across the regional boundaries and not at the reference nodes. It is therefore necessary to develop a methodology that separates the interconnector losses in such a way that the flow at each end of the interconnector can be determined.
This paper, ‘Proportioning Inter-regional Losses to Regions’, defines the methodology used to separate losses that occur on the NEM interconnectors and allocate them to the regions in which they occur.
This document has been updated to include the changes from the removal of the Snowy region from 1 July 2008.
For further information on this document, please contact: Keng Loh, System Operations Planning & Performance
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Proportioning of Inter-Regional Losses within Regions - 16 Jun 2008 170-0070.pdf |