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Asymmetry underlies stability in power grids.
Ferenc Molnar1,2, Takashi Nishikawa3,4, Adilson E Motter1,5
1Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA.
Nature Communications
|March 6, 2021
Summary
Making power grid generators suitably heterogeneous can improve stability, contrary to previous assumptions. This study demonstrates converse symmetry breaking in real-world systems, offering a new method for network analysis.
Area of Science:
- Network science
- Power systems engineering
- Theoretical physics
Background:
- Network systems often require behavioral homogeneity for stable functioning.
- Power grid stability relies on synchronized generator frequencies.
- Prior research suggested generator homogeneity enhances grid stability.
Purpose of the Study:
- To investigate the effect of generator heterogeneity on power grid stability.
- To demonstrate converse symmetry breaking in a real-world network.
- To develop a general method for identifying converse symmetry breaking.
Main Methods:
- Analysis of power grid dynamics.
- Application of converse symmetry breaking theory.
- Development of a novel analytical method.
Main Results:
- Suitably heterogeneous generators can substantially improve power grid stability.
- This improvement is attributed to converse symmetry breaking.
- The study provides the first real-world demonstration of converse symmetry breaking.
Conclusions:
- Generator heterogeneity can enhance power grid stability, challenging previous notions.
- Converse symmetry breaking is a key mechanism for achieving stability in certain network states.
- The developed method can identify converse symmetry breaking in other behavioral homogeneity-dependent networks.
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