Linear and uniform swing dynamics in multimachine converter-based power systems. (February 2021)

• Record Type: Journal Article
• Authors: Raisz, David; Deepak, Deepak; Ponci, Ferdinanda; Monti, Antonello
• Is Part Of: International journal of electrical power & energy systems. Volume 125(2021)
• Publication Date: 2021-02
• Subjects: Converters -- Power system control -- Power system dynamics -- Power system stability -- Renewable energy sources; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2020.106475
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: There are no common design guidelines for Virtual Synchronous Machines yet. Power system dynamics will be difficult to analyze and predict. Linear Swing Dynamics ensures fixed eigenvalues regardless of operating point. Delta-based" LSD provides best solution, independent on network conditions. Advantages are proven for single- and multimachine systems. Abstract: The increase in RES generation is replacing the classical synchronous generators (SGs), which has resulted in gradually losing the beneficial inherent properties of SGs for power system stability. In order to mimic the inertial behavior of SGs, the concept of Virtual Synchronous Machines (VSMs) has been proposed, but their interactions at different time-scales and their effect on system stability are not yet fully understood. Therefore, a new scientific basis for designing and regulating the system is required. This paper contributes by advancing the idea of Linear and Uniform Swing Dynamics (LSD). This concept can be used to shape the dynamic behavior of these VSMs by controlling the eigenvalues to be constant throughout its operating region. Consequently, the validity of small-signal stability analysis can be extended for larger disturbances. Existing approaches to achieve LSD for a Single-Machine – Infinite Bus (SMIB) system are analyzed and complemented, and extended for multi-machine systems. The stability analysis using system differential equations is presented. Time-domain simulation results in MATLAB/Simulink are presented to validate the concept.