Analysis and simulation of Wide-Area Loss Index (WALI) method for voltage instability protection of power systems

This paper discusses the development and analysis of simulation models using SimPowerSystems utilities in MATLAB to validate the Wide-Area Loss Index (WALI) method for voltage instability protection of power systems. WALI is a novel method for protection of a bulk power system against voltage instability. In this methodology, a region of interest is defined and the system is protected against voltage collapse using synchronized wide-area power-flow measurements. A power corridor was built in the simulation model to demonstrate the behavior of WALI algorithm where the load is increased with a constant power factor until the system collapses.