Ancillary transmission services
Ancillary services comprise both system support requirements and end user requirements, which should be distinguished and treated separately. End user requirements could be met most efficiently locally rather than via the bulk power network. System support requirements should be provided or procured by the transmission entity, with costs folded into load-sensitive tariffs. The author considers ancillary services to fall in four areas: active energy (frequency control, which implies default regulation and loss compensation); reactive energy; capacity (reserves); and operation management (security and coordination). Each of these, insofar as they relate to the network, provides indivisible support of network functioning. The term `indivisible` is used vis-a-vis individual energy market trensactions. Candidates for ancillary services should be discussed first in terms of their respective characterstics and requirements. Most importantly, it is necessary to ask, who or what gives rise to the need for a particular service? For whose benefit is it provided? Can responsibility for use of the service always be traced to the responsible party? For those services which are system requirments, additional questions must be addressed. How can costs be assigned equitably? Then, because of the disparate nature of these four categories, the manner in which each should be procured must be considered. These and related issues are discussed on a case-by-case basis in this article.
- OSTI ID:
- 379387
- Journal Information:
- Electricity Journal, Vol. 9, Issue 5; Other Information: PBD: Jun 1996
- Country of Publication:
- United States
- Language:
- English
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