2021 IEEE 4th International Electrical and Energy Conference (CIEEC) | 2021
Synchronization Stability Domain for Power Systems Integrated with PMSG Based on Energy Function
Abstract
It is a challenge for permanent magnet synchronous generators (PMSGs) to resynchronize with the AC grid via the phase-locked loop (PLL) during low-voltage ride through (LVRT) period. This paper presents the transient energy function based on the Lyapunov’s direct method to approximate the boundary of the synchronization stability domain of PMSG. First, a reduced-order control model describing the dynamic synchronization characteristics of PMSG is established. Based on this model, the transient energy function of PMSG is derived by first integration method, and the critical energy value is determined by the potential energy boundary surface (PEBS) method. Then, the boundary of the synchronization stability domain is approximated by the critical energy value. Besides, the impacts of circuit parameters on the synchronization stability domain of PMSG are investigated. Simulations performed on the single PMSG-Infinite bus system verify the effectiveness of the method.