Robust scale-free synthesis for frequency control in power systems

Research output: Contribution to journalArticle

Abstract

The ac frequency in electrical power systems is conventionally regulated by synchronous machines. The gradual replacement of these machines by asynchronous renewable-based generation, which provides little or no frequency control, increases system uncertainty and the risk of instability. This imposes hard limits on the proportion of renewables that can be integrated into the system. In this paper, we address this issue by developing a framework for performing frequency control in power systems with arbitrary mixes of conventional and renewable generation. Our approach is based on a robust stability criterion that can be used to guarantee the stability of a full power system model on the basis of a set of decentralized tests, one for each component in the system. It can be applied even when using detailed heterogeneous component models, and can be verified using several standard frequency response, state-space, and circuit theoretic analysis tools. Furthermore, the stability guarantees hold independently of the operating point, and remain valid even as components are added to and removed from the grid. By designing decentralized controllers for individual components to meet these decentralized tests, every component can contribute to the regulation of the system frequency in a simple and provable manner. Notably, our framework certifies the stability of several existing (nonpassive) power system control schemes and models, and allows for the study of robustness with respect to delays.

Details

Authors
Organisations
External organisations
  • Johns Hopkins University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Control Engineering

Keywords

  • Decentralized control synthesis, frequency control, power systems, robust stability
Original languageEnglish
Pages (from-to)1174-1184
Number of pages11
JournalIEEE Transactions on Control of Network Systems
Volume6
Issue number3
Publication statusPublished - 2019 Sep
Publication categoryResearch
Peer-reviewedYes