Grid Support - Frequency Controlled Instantaneous Reserve

[NiallDarwin]

Hi,

We would like to be able to perform fast IR* support with our OEMS controlled inverter. Has this been implemented by anyone?

Thanks

*Instantaneous Reserve is a response to grid frequency dropping below a certain frequency (49.2 Hz here in NZ). When this occurs the inverter should switch to dispatching energy as quickly as possible. The power grid pays based on speed of response so speed really is importatnt. Here in NZ this is most likely to be needed when our one coal power station faults.

[stefan.feilmeier]

@NiallDarwin We (at FENECON) did something like this before. See this post in German:

Normative Reaktions & Ausregelzeiten

Hallo @max-win-at, wir haben unsere Industriespeicher in Schweden für “Fast Frequency Reserve” präqualifiziert. Dort sind noch etwas striktere Reaktionszeiten gefordert. Meine Tips: So wenige Kommunikationsstrecken wie möglich (Wofür braucht es den MQTT-Broker dazwischen?) Niedrige Cycle-Time. 200ms sollte ausreichen Sorgfältig ausgewählte Komponenten (v.A. sehr schneller Netzzähler, z. B. von Janitza) Leistungsfähige IoT-Hardware. Wobei hier sowas wie ein Raspberry Pi 4 genug ist. Gruß, St…

Controller-Implementation is here: openems/io.openems.edge.controller.ess.fastfrequencyreserve at develop · OpenEMS/openems · GitHub

From experience it’s always best if the Battery Inverter can do this directly; but if not possible or sufficiently advanced for the application, EMS can do it as well.

If I remember correctly we achieved 1.2 seconds from Frequency Drop till Full Power Discharge of the battery, which was the requirement for FFR (Fast Frequency Response) here.

Regards,
Stefan