access icon free Effects analysis of excitation circuit on power control for VSG: a design-oriented study

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.

Inspec keywords: power control; power grids; power system control; eigenvalues and eigenfunctions; damping; synchronous generators; oscillations; power system stability; reactive power control

Other keywords: power oscillation damping performance; eigenproperties analysis; power control performance; excitation circuit; VSG system performance; power control time scale; RPCL; theoretical analysis; system power control; virtual synchronous generator; eigenvalue locus analysis; reactive power control loop; simplified SG model; VSG system modelling

Subjects: Stability in control theory; Control of electric power systems; Power and energy control; Synchronous machines; Linear algebra (numerical analysis); Power system control; Linear algebra (numerical analysis)

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-rpg.2019.0389
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