At 16:01 on April 10, 2025, a system frequency dip was observed from the Global-Roam frequency logger which records at 100 millisecond intervals.
In this article we present three charts using the frequency data to provide an initial point of reference for any future analysis that, time permitting, we may perform.
Frequency dipped to 49.824 Hz and spent some time near the lower NOFB
Zooming in we observe some variability in the measurements between 16:01:15 and 16:01:23
The decline happened over relatively long period leading to only moderate rates of change
Linton is a Senior Software Engineer and Market Analyst, who joined Global-Roam in August 2020.
Before joining the company, Linton worked at the Australian Energy Market Operator (AEMO) for seven years, including four years as an analyst within their demand forecasting team. Before entering the energy sector, he worked as an air quality scientist in the Czech Republic.
Ancillary Services Matter! No longer just realm of electrical engineer or energy trading boffins, ancillary services (and particularly Frequency Control Ancillary Services or FCAS which will concentrate on today) have become front and centre in so many ways that barely a day goes by without market observers referring to grid stability, inertia or frequency management.
The National Electricity Market (NEM) is designed to operate at 50 Hz. Frequency deviation occurs when generation and load are mismatched. It is important in a lightly meshed and long network such as the NEM to maintain tight frequency control and that frequency response is available throughout the network.
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 to fill in some background, provide…
A very short article for Wednesday 6th November 2024, such that we might follow up later, to note the following two wobbles in frequency in the mainland NEM today
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