Mapping of dynamics between mechanical and electrical ports in SG-IBR composite grids
File(s)
Accepted version
Author(s)
Li, Yitong
Gu, Yunjie
Green, Timothy
Type
Journal Article
Abstract
Power grids are traditionally dominated by synchronous generators (SGs) but are currently undergoing a major transformation due to the increasing integration of inverter-based resources (IBRs). The state space method with transparent apparatus models can be readily used. However, models of IBRs are usually not disclosed by manufacturers. Alternatively, the port-based approach represents dynamics by input-output transfer functions without exposing internal states. These transfer functions at various ports are normally configured with a particular focus: an SG-dominated grid is traditionally analyzed in a mechanical-centric view which ignores fast electrical dynamics and focuses on the torque-speed dynamics, whereas the emergent IBR-dominated grid usually takes an electrical-centric view which focuses on the voltage-current interaction. In this article, a new perspective called the port-mapping method is proposed to combine these two views. Specifically, the mechanical dynamics are mapped to the electrical impedance seen at the electrical port; and the electrical dynamics are also mapped to the torque coefficient seen at the mechanical port. The bidirectional mapping gives additional flexibility and insights to analyze the sub-system interactions in whole-system dynamics and guide the tuning of parameters. Application of the proposed method is illustrated in three cases with increasing scales.
Date Issued
2022-09-01
Date Acceptance
2022-01-06
Citation
IEEE Transactions on Power Systems, 2022, 37 (5), pp.3423-3433
ISSN
0885-8950
Publisher
Institute of Electrical and Electronics Engineers
Start Page
3423
End Page
3433
Journal / Book Title
IEEE Transactions on Power Systems
Volume
37
Issue
5
Copyright Statement
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Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Grant Number
EP/T021780/1
EP/S000909/1
Subjects
Science & Technology
Technology
Engineering, Electrical & Electronic
Engineering
Power system dynamics
Power system stability
Torque
Impedance
Transfer functions
Rotors
Oscillators
Port-Mapping
electrical-mechanical two-port network
synchronous generator
inverter based resource
composite power system
SYSTEMS
Energy
0906 Electrical and Electronic Engineering
Publication Status
Published
Date Publish Online
2022-01-11