Coordinated Damping Control Design for Power System With Multiple Virtual Synchronous Generators Based on Prony Method

• Published in: IEEE open access journal of power and energy Vol. 8; pp. 316 - 328
• Main Authors: Zhao, Min, Yin, Hang, Xue, Ying, Zhang, Xiao-Ping, Lan, Yuanliang
• Format: Journal Article
• Language: English
• Published: New York IEEE 2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Control methods; Control systems design; Controllers; coordinated supplementary damping controller; Damping; decentralized control; Design; energy storage; Generators; Inertia; Information processing; low-frequency oscillation; Oscillators; Power system stability; Prony method; Prony's method; Reactive power; sequential design method; State space models; Synchronous generators; Synchronous machines; Virtual synchronous generator (VSG); Voltage control; Voltage measurement
• ISSN: 2687-7910; 2687-7910; 2644-1314
• DOI: 10.1109/OAJPE.2021.3104755

With more renewables integrated into power grids, the systems are being transformed into low inertia power electronic dominated systems. In this situation, the virtual synchronous generator (VSG) control strategy was proposed to deal with insufficient inertia challenge caused by the reduction of synchronous generation. However, as the VSG control method emulates the dynamic behavior of traditional synchronous machines, the interaction between multiple VSG controllers and synchronous generators (SGs) may cause low-frequency oscillation similar to that caused by the interaction between multiple SGs. This paper reveals that the system low-frequency oscillatory modes are affected by multiple VSGs. Then Prony analysis is utilized to extract the system mode information which will be subsequently used for VSG controller design, and a decentralized sequential coordinated method is proposed to design the supplementary damping controller (SDC) for multiple VSGs. The system low-frequency oscillation is first analyzed based on a modified two-area system with a linearized state-space model, and a further case study based on a revised New England 10-machine 39-bus system is used to demonstrate the effectiveness of the proposed coordinated method for multiple VSGs.