Direct methods for transient stability analysis and contingency screening in power systems

Abstract

This master’s thesis addresses the challenges associated with power interruption and unstable operation in power systems. It highlights the potential for enhancing transient stability analysis through the utilization of direct methods. Furthermore, it recognizes the increasing importance of online transient stability analysis in the future, driven by factors such as electrification and an influx of renewable energy sources. These factors necessitate operating the grid closer to its operational limits.

The primary aim of this master thesis was to establish the theoretical framework for direct methods and devise a practical approach for implementing the controlling unstable equilibrium point method.

The thesis includes two test cases: a single machine infinite bus test case and a multimachine test case. Results obtained from these test cases align with expectations and existing literature, in computing critical clearing times. For the multimachine test case a homotopy approach was utilized to calculate the CUEP.