Ancillary services definitions, markets and practices in the world
Paper i proceeding, 2011

Ancillary services are some operational reserved services procured by the Transmission System Operator (TSO) for keeping a balance between supply and demand, stabilizing the transmission system and maintaining the power quality on an economical basis in any competitive electricity market environment. This paper discusses different types of ancillary services and their characteristics and challenges in the power market in order to find an efficient combination of ancillary services with the least reservation cost that secures reliable transmission system operation. An overview of practical experiences regarding performance of ancillary services in several competitive markets in the Europe, Australia and New Zealand will be discussed. Further, wind power as a disputable ancillary service will be presented in brief. In addition, some efficient proposals for revising the design and implementation of those markets will be mentioned in conclusions.

Independent System Operator

Power Market Management

Power Quality

Ancillary Services

Wind Power


Ali Mehdipour Pirbazari

Chalmers, Energi och miljö, Elkraftteknik

2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America, T and D-LA 2010

978-145770487-1 (ISBN)


Annan elektroteknik och elektronik





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