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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 \textit{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.
Original language | English |
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Pages (from-to) | 3423 - 3433 |
Journal | IEEE Transactions on Power Systems |
Volume | 37 |
Issue number | 5 |
Early online date | 11 Jan 2022 |
DOIs | |
Publication status | Published - 30 Sep 2022 |
Keywords
- Composite Power System
- Electrical-Mechanical Two-Port Network
- Impedance
- Inverter Based Resource
- Oscillators
- Port-Mapping
- Power system dynamics
- Power system stability
- Rotors
- Synchronous Generator
- Torque
- Transfer functions
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
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Dive into the research topics of 'Mapping of Dynamics between Mechanical and Electrical Ports in SG-IBR Composite Grids'. Together they form a unique fingerprint.Projects
- 1 Finished
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Fellowship - Grid-Supportive Power Electronics for Power System Security
Engineering and Physical Sciences Research Council
16/07/20 → 30/03/22
Project: Research council