Power Angle Small-Signal Stability Analysis of Grid-Forming Wind Turbine
Inverter Based on VSM Control
Abstract
This paper introduces a virtual synchronous machine (VSM) control scheme
which is based on a minimized emulation of the model of a synchronous
generator (SG) for a grid-forming wind turbine (WT) inverter. Based on
this VSM control scheme, state-space representation and block diagram of
the small-signal model for the VSM-controlled grid-forming inverter
connected to an infinite bus are derived, which are used for
small-signal stability analysis of the power angle in the VSM control
scheme. This power angle small-signal stability (PAS) analysis is
proposed as a simpler way for analyzing the influence on the rotor angle
stability of power system from large share of VSM-controlled
grid-forming inverters. Influence of parameters in the power loop of the
control scheme on the PAS is investigated by analyzing the eigenvalue
trajectories of the state matrix.