Grid frequency on 13th February 2024
Grid frequency had dropped to 49.689 Hz. We take an initial look into the timeseries of grid frequency recorded on the day.
system frequency
Mainland System Frequency drops through the floor with ‘Significant Power System Event’ on Tue 13th Feb 2024
Second quick article about 13th February 2024 ... with mainland power system frequency dropping through the floor in this 'Significant power system event' in Victoria.
The NEMs frequency behaviour – how is it going?
Following recent online discussions, Bruce Miller has produced this in-depth analysis of frequency behavior in th NEM.
Has adding wind and solar upped the need for FCAS in the NEM?
Allan O'Neil digs through historic FCAS enablement and utilisation levels to examine whether there is an increasing trend in recent years.
Investigating last Friday’s frequent frequency swings
Allan O'Neil provides an explainer about how small deviations in supply and demand are managed in the NEM, in order to help us understand the apparent swings in frequency that we noted in QLD...
Twelve hours of Mainland NEM System Frequency on Friday 3rd February 2023
Another article today presenting 12 hours of history of System Frequency (to ~14:00 on Friday 3rd February 2023) with a few questions added. Comments welcome!
A messy separation: a look at the frequency swings in SA during Saturday afternoon’s islanding event
Dan Lee takes a quick look at 5-second frequency data to show SA's separation from the rest of the NEM and the ensuing frequency swings on late Saturday afternoon.
Slightly more detail on System Frequency on Friday 14th October 2022 (Part 4)
Zooming into the ~7 minute period during which the initial event occurred in TAS on Friday 14th October 2022.
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.
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.
Observations of differences in system frequency in the Mainland NEM (comparing 2019 to 2021)
One of the many data sets being crunched as part of our analytical efforts underpinning the development of 'GenInsights21' is system frequency. In this short article today, we share some initial observations on how...
Both units trip at Callide C on Wednesday 13th January 2021
A pretty rare event in the NEM, when two units trip simultaneously ... so a short article on WattClarity as a result.
What’s “Primary Frequency Response” and why does it matter anyway?
Paul McArdle recently drew my attention to a short Twitter thread started by David Osmond on the arcane topic of NEM system frequency behaviour: At Paul’s invitation I’ve dived further into this issue...
Reviewing the ‘accelerated accidental experiment’ thrust on SA during the islanding (31st Jan to 17th Feb) – a 1st review
As time has permitted, I've invested some time to prepare this first stage of a review of what went on during the period from 31st Jan 2020 to 17th Feb 2020 - a period...
Rooftop Solar PV systems did trip in SA on Friday 31st January 2020 in conjunction with the Heywood trip
Investing some time over the weekend with a some higher-speed data on output of rooftop solar PV systems across VIC and SA reveals some interesting observations about what happened on Friday 31st January 2020...
January 31 Followup – How did the lights stay on in South Australia?
Guest author, Allan O'Neil delves further into understanding what happened in response to the transmission tower failures on 31st January 2020 that sent system frequency in South Australia and led to a large reversal...
What happened with System Frequency with the SA Islanding on Friday 31st January 2020?
Cautioning readers that I am a novice at reading frequency data in this manner, I take a first look at how the frequency in Melbourne and South Australia varied at the time of the...
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.
Further analysis of the (very rare) double-islanding events of Saturday 25th August 2018
The multi-region islanding event on Saturday 25th August was a very rare event - perhaps the only one's that occurred in the history of the NEM. It has generated plenty of questions - and...