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DY: Fachverband Dynamik und Statistische Physik

DY 10: Nonlinear Dynamics, Synchronization and Chaos

DY 10.7: Vortrag

Montag, 18. März 2024, 16:30–16:45, BH-N 128

The Dynamics of Future Power Grids - Bridging Theory and Application — •Anna Büttner and Jakob Niehues — Potsdam Institute for Climate Impact Research (PIK), 14412 Potsdam, Germany

Renewable energy sources such as wind turbines and solar cells are connected to the power grid via inverters. As we move towards a fully renewable grid, there is a growing need for so-called grid-forming inverters (GFIs) that can contribute to grid stability and synchronization. This shift presents a significant challenge as GFIs are a relatively new and complex technology, of which there is a limited practical and theoretical understanding. The so-called normal form of GFIs is a formulation that does not depend on the technology of the grid-forming actors and can be estimated from data.

In this talk, we show recent results from the validation of the normal form via system identification. The normal form can accurately model the dynamic behavior of a large class of GFIs. We present these results for lab measurements as well as complex simulation data.

We also show novel analytical results on the linear stability of the synchronous state of general power grid dynamics. Using the novel small-phase theorem we have shown that the stability can be analyzed in terms of a network component and the local dynamics, given by the normal form.

We are thus for the first time able to show stability results for validated power grids thereby bridging the gap between theoretical calculations and real-world application.

Keywords: Linear Stability; Data-Driven; Synchronization; Power Grids; Oscillators