Combining quasi-static models and homotopy techniques for loading margin computation

摘要

This paper analyzes a tool devoted to the computation of the loading margin of power systems in the context of long-term voltage stability assessment. This tool is based on the application of homotopy techniques to solve a power system model constructed in the basis of quasi-steady-state approximations. The analyzed tool is compared to the well-known continuation power flow method in terms of accuracy and computing time. The ability of the tool to identify small-signal stability issues is also tested. This last point is verified by means of time-domain and quasi-steady-state simulations. All stability assessment methods and simulations are performed on a real-world power system.