Small drop in NEM Mainland Frequency with Stanwell Unit 3 offline
A quick look at a small drop in frequency seen on Wednesday 16th October 2024.
frequency disruption
A collation of articles pertaining to some larger disruptions in system frequency (such as outside of the Normal Operating Frequency Band – NOFB).
Drop in System Frequency on Saturday 5th October 2024 – Part 2
To further understand the frequency drop we delve into the 4-second data (used for regulation FCAS contribution calculations) in this Part 2, looking at generating units (including BDUs).
Minor drop in NEM Mainland System Frequency on Friday 11th Oct 2024, most likely related to trip of LYA1
A quick record of the trip of Loy Yang A1 unit just prior to 08:40 (NEM time) this morning … Friday 11th October 2024:
Mainland frequency trends lower for a few minutes on late Sunday afternoon 6th October 2024.
A short article looking at system frequency late afternoon Sunday 6th October 2024.
Drop in System Frequency (approx 15:45 NEM time) on Saturday 5th October 2024
Looking back at system frequency, we see a noticeable drop in system frequency around ~15:45 (NEM time) on Saturday 5th October 2024. (a) There's no large trip of a coal unit that coincides (b)...
Small frequency dip with Bayswater unit 3 tripping offline on Wednesday 2nd October 2024
A short article looking at a small drop in system frequency on Wednesday 2nd October 2024, perhaps related to Bayswater unit 3 tripping offline.
There was a second drop in System Frequency on the Mainland (at ~16:45) on Thursday 5th September 2024
There were two significant drops in frequency on Thursday 5th September 2024. Whilst the first coincided with (brief) Market Suspension, in this article we take a look at the second (around 16:45).
Drop in System Frequency on the Mainland on Thursday 5th September 2024
A quick look at how System Frequency trended down with the IT issues experienced at AEMO impacting on the dispatch process.
Jump in mainland System Frequency, coincident with potline trip at Portland smelter
We take a quick look, after (at 00:01 Wednesday 28th August 2024) both potlines at Portland Smelter tripped.
Tasmania’s grid frequency on Friday 12 April 2024
Three data points points help to highlight the change in grid frequency in Tasmania on 12 April 2024.
14 hours of trended (mainland) frequency on Tuesday 13th February 2024
A first article from me after starting to delve into a 14-hour time series of AEMO's 4-second data for Tuesday 13th February 2024 (this one a trend of frequency to highlight points of interest).
Plenty of things went wrong in Queensland last Tuesday, but some very important things went right
Whilst there were many things that went wrong on Tuesday 25th May 2021 (last week), guest author Allan O'Neil highlights that there were at least 4 things that went right - contributing to a...
Hornsdale Frequency data seems to confirm QNI separated on 25th May
Two brief (but important) observations made possible with a chart published on RenewEconomy with respect to the Hornsdale Power Reserve.
There were 3 events on Tue 25th May – and it seems likely that QNI separated briefly in Event 2
A deeper look at the frequency data (our own, and also from some others) reveals a number of other interesting things about what happened on Tuesday 25th May 2021 in Queensland.
Three Events Yesterday – with Mainland Frequency as low as 48.555Hz
Part 5 in an expanding series, looking at what happened in QLD on Tuesday 25th May 2021 - this one looking at system frequency.
Almost three years on – reflections on Frequency Control in the NEM
Guest author (and power system control specialist), Kate Summers, looks at what's changed since she published a paper on frequency control in the NEM back in January 2017.
When the NEM’s Largest Generating Unit Trips …
A follow-on to my earlier article of a couple weeks ago, looking at another instance where a team effort was required to counter a drop in system frequency following the loss of generation at...
FCAS in Action – What Happens When a Generator Trips? (or Never let the data get in the way of a good story)
Understanding the FCAS response by all generators when a unit trips in the NEM. A detailed look at the Loy Yang A unit trip in December 2017 and the contribution of the Hornsdale Power...