Cyber Network Design for Secondary Frequency Regulation: A Spectral Approach

Conference · Thu Aug 30 04:00:00 EDT 2018

DOI:https://doi.org/10.23919/PSCC.2018.8442814· OSTI ID:1478180

Zhao, Changhong ^[1]; Guo, Linqi ^[2]; Low, Steven H. ^[2]

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1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
2. California Institute of Technology

We present a preliminary theoretical framework based on spectral graph theory that captures how the cyber topology of a distributed secondary frequency control scheme impacts the stability, optimality, and transient performance of our power system as a cyber-physical network. We show that a collection of polynomials defined in terms of the cyber and physical Laplacian eigenvalues encode information on the interplay between cyber and physical networks. It is demonstrated that to understand the impact of adding cyber connectivity, one should separate the low-damping and high-damping regimes. Although adding cyber connectivity always improves the performance for high-damping systems, it is not the case for low-damping scenarios. Based on the theoretical study, we discuss how a good cyber network should be designed. Our empirical study shows that for practical systems, the number of communication channels that is needed to achieve near-optimal performance is usually less than twice the number of buses.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1478180
• Report Number(s): NREL/CP-5D00-72608
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
eigenvalues and eigenfunctions
frequency control
laplace equations
network topology
power system stability
topology
transmission line matrix methods