Synchronization of Coupled Phase Oscillators with Stochastic Disturbances and the Cycle Space of the Graph

Synchronization of Coupled Phase Oscillators with Stochastic Disturbances and the Cycle Space of the Graph

Xi, Kaihua (Shandong University)
Wang, Zhen (Shandong University)
Cheng, Aijie (Shandong University)
Lin, H.X. (TU Delft Mathematical Physics)
van Schuppen, J.H. (TU Delft Mathematical Physics)
Zhang, Chenghui (Shandong University)

2023

The synchronization stability of a complex network system of coupled phase oscillators is discussed. In case the network is affected by disturbances, a stochastic linearized system of the coupled phase oscillators may be used to determine the fluctuations of phase differences in the lines between the nodes and to identify the vulnerable lines that may lead to desynchronization. The main result is the derivation of the asymptotic variance matrices of the phase differences which characterizes the severity of the fluctuations. It is found that the cycle space of the graph of the system plays a role in this characterization. With theory of the cycle space, the effect of forming small cycles on the fluctuations is evaluated. It is proven that adding a new line or increasing the coupling strength of a line affects the fluctuations in the lines in any cycle including this line, while it does not affect the fluctuations in the other lines. In particular, if the phase differences at the synchronous state are not changed by these actions, then the affected fluctuations reduce.

asymptotic variance
cycle space of graphs
invariant probability distribution
Lyapunov equation
networked system
stochastic Gaussian system
synchronization stability

http://resolver.tudelft.nl/uuid:4974ab34-8a3a-437e-9881-4c8726c119c5

https://doi.org/10.1137/22M1489502

1536-0040

SIAM Journal on Applied Dynamical Systems, 22 (2), 1030-1052

Institutional Repository

journal article

© 2023 Kaihua Xi, Zhen Wang, Aijie Cheng, H.X. Lin, J.H. van Schuppen, Chenghui Zhang