Comparative Analysis of Impedance-Based Stability Assessment Methods for Inverter-Based Resources

The Impedance-based stability assessment (IBSA) methods are widely used to identify control interaction issues between inverter-based resources (IBRs) and transmission grid. The IBR impedance models can be obtained and analyzed in different reference frames and forms, such as positive sequence single-input single output (SISO) and dq-frame multi-input multi-output (MIMO) forms. Accordingly, different IBSA methods should be applied. In this paper, six IBSA methods are reviewed, compared, and their applications are demonstrated. Merits and shortcomings of each method are discussed, and recommendations are presented for engineers and researchers. The IBSA results are compared with electromagnetic transient (EMT) simulations in two test systems involving doubly-fed induction generator (DFIG) and full-size converter (FSC)-based wind parks (WPs).