NREL Open-Source Modeling Approach Simulates Low-Inertia Power Systems

Re:NREL Open-Source Modeling Approach Simulates Low-Inertia ... by brandmeyer on Monday July 26, 2021 @05:41PM (#27965848)

Primary frequency reserve kicks in to automatically throttle back dynamic sources. Typical throttle rate is 100% throttle response per 5% frequency deviation. Inertia (both real and virtual) just slows down the system response enough that PFR will be effective. Just about every steam plant, combined-cycle plant, and gas-turbine plant participates in PFR. There have been proposals for inverter-connected systems to participate as well, but I don't know how common it is in practice.

Once upon a time the rated load-step response for a sub-grid in the US was a step-off transient of a nuclear power site going off-line.

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Re:NREL Open-Source Modeling Approach Simulates Low-Inertia ... by guerby on Monday July 26, 2021 @06:13PM (#27966147)

Thanks for your reply.

Is the Hornsdale Power Reserve "participating" in this mechanism?

https://en.wikipedia.org/wiki/Hornsdale_Power_Reserve

Since it's a Lithium battery I assume it's "inverter-connected".

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Re:NREL Open-Source Modeling Approach Simulates Low-Inertia ... by brandmeyer on Monday July 26, 2021 @07:09PM (#27966612)

At that scale, they may be doing more interesting things, like participating in whatever passes for a spot market, or even time-of-day arbitrage.

There is considerable variation region-to-region, but a common pattern is for the spot market to clear every 15 minutes to provide secondary frequency reserve, with a day-ahead market that clears 24 hours in advance, and a wide range of futures markets that build on the day-ahead market.

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