AEMO Scheduling Error Affecting Dispatch of Mintaro Power Station
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A constraint equation was designed to maintain flow on the Mintaro to Waterloo 132kV transmission line in South Australia below its continuous rating. This constraint equation is known as S>NIL_NIL_MNWT and it was not formulated in accordance with AEMO processes for the formulation of co-optimised constraint equations. As a consequence, AEMO has determined that a scheduling error occurred for those dispatch intervals in which this constraint bound during the period from 19 May 2009 to 14 January 2010.
S>NIL_NIL_MNWT did not include all relevant terms on the left hand side and affected the dispatch of Mintaro Gas Turbine Station whenever it bound. On 14 January 2010 it was reformulated to include all relevant interconnectors and generating units on the left hand side.
AEMO does not consider other Generators would have been constrained-on or constrained-off by it.
The scheduling error impacted on dispatch of Mintaro, generally by constraining Mintaro more than would have been expected with the correct constraint equation. However, in some intervals Mintaro has been constrained less than would have been expected. The range of the impact on Mintaro is 10 MW dispatched higher than expected to 18 MW dispatched lower than expected.
For further information on this document, please contact: Shantha Ranatunga, Market Operations & Performance.
Market Event Report – Scheduling Error Affecting Dispatch of Mintaro Power Station
06 Sep 2010 | filename: 0180-0006.pdf