Woolcock, Luke Peter (University of Melbourne), Schmid, Robert (The University of Melbourne)

Performance Comparison of MIMO Gain/Phase Analysis Methods for Sub-Synchronous Instability

Scheduled for presentation during the Regular Session "Young Authors Award special session" (ThuS3T2), Thursday, July 11, 2024, 17:10−17:30, Grand Amphitheater

12th IFAC Symposium on Control of Power & Energy Systems, July 10-12, 2024, Rabat, Morocco

This information is tentative and subject to change. Compiled on January 2, 2025

Abstract

Recently, there has been great interest in the development of stability criteria for grid-connected power converters and generators using frequency-domain impedance models. We consider two recently introduced stability analysis methods and compare their small-signal stability performance for a DFIG wind farm connected to a series-compensated grid. The first method, known as the Low-Cost Global Nyquist Condition, uses Gershgorin disks derived from the loop gain matrix to provide an stability criterion. The second method, introduced by the authors, uses a combined matrix gain and phase stability analysis. The two methods are compared by using them to predict the onset of instability in a series-compensated wind farm under a tripped line. The results reveal that the gain/phase based approach achieves less conservatism than the Nyquist-based method.