Effects analysis of excitation circuit on power control for VSG: a design‐oriented study. Issue 5 (6th December 2019)

• Record Type: Journal Article
• Authors: Qu, Zisen; Yang, Huan; Han, Junfei; Song, Chunwei; Li, Wuhua; Cai, Yunyi
• Is Part Of: IET renewable power generation. Volume 14:Issue 5(2020)
• Page Start: 803
• Page End: 810
• Publication Date: 2019-12-06
• Subjects: synchronous generators -- power system stability -- eigenvalues and eigenfunctions -- damping -- power grids -- reactive power control -- power system control -- oscillations -- power control; eigenproperties analysis -- excitation circuit -- power oscillation damping performance -- system power control -- theoretical analysis -- reactive power control loop -- RPCL -- virtual synchronous generator -- VSG system performance -- power control performance -- simplified SG model -- VSG system modelling -- power control time scale -- eigenvalue locus analysis; Renewable energy sources -- Periodicals; 333.79405
• DOI: 10.1049/iet-rpg.2019.0389
• Languages: English
• ISSNs: 1752-1416

Abstract

Abstract : Reactive power control loop (RPCL) in virtual synchronous generator (VSG) plays the role of excitation circuit in conventional SG. The control strategy improvement or parameters configuration method of RPCL is always the emphasis of analysis. However, the impacts of RPCL on VSG system performance are usually overlooked. On the basis of that, this study aims to investigate the effects of RPCL on power control performance. First, a simplified SG model is established and implemented to VSG. Then, VSG system modelling with state equations in power control time scale is elaborated. The excitation current in the modelling is regarded as one crucial state variable to identify the effects of the excitation circuit on VSG system. Eigenvalue locus analysis and eigenproperties analysis reveal how the excitation circuit affects power oscillation damping performance and even results in power coupling issue of power control. The effects of operating points on system power control are also taken into account. Finally, the experimental results are given to verify the theoretical analysis.