Apologies, in advance, that this short article might be a bit cryptic.
On Thursday 15th February 2024 I posted an (initial) ‘sequence of events for what happened in Victoria through the day on Tuesday 13th February 2024 (via Timescale #1)’ … then updated later in the day to include what I labelled as Event #1.
Curiosity (and some external questions) drove me to open up NEMreview v7 just now and put together this trend of (Raise Regulation) FCAS supply from DUIDs on the mainland through the entirety of the day.
For those with a licence to the software, you can open your own copy of this query here.
We can certainly see the effect of the increased requirement for RaiseReg FCAS that the AEMO signalled in Market Notice 114561, which I have copied in here for ease of reference:
__________________________________________________
Notice ID : 114561
Notice Type ID : Subjects not covered in specific notices
Notice Type Description : MARKET
Issue Date : Tuesday, 13 February 2024
External Reference : Variation to FCAS regulation raise requirements: NEM Mainland – 13/02/2024
__________________________________________________
AEMO ELECTRICITY MARKET NOTICE
Variation to FCAS regulation raise requirements: NEM Mainland – 13/02/2024
FCAS Raise regulation requirements have been increased.to manage frequency.
The following constraint set has been invoked.
F-MAIN_RREG_0450 at 1200 hrs.
Manager NEM Real Time Operations
Nothing more to add…
There was some information on this in section 2.3 of AEMO’s preliminary report into Feb 13:
Prior to the event, AEMO was managing a sustained low frequency event including the loss of approximately
500 MW of generation from Stockyard Hill WF that occurred at approximately 1135 hrs and had increased the
minimum frequency control ancillary service (FCAS) regulation raise requirement. Constraint set
F-MAIN_RREG_0450 was invoked between 1200 hrs and 1355 hrs on 13 February 2024 to ensure mainland
regulation raise requirement was greater than 450 MW.