Ecuadorian National Interconnected System (SNI) Using the Equal Area Criterion and Synchrophasor Measurements
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Abstract
Static angle stability is a critical aspect in the operation of power systems, ensuring the synchronization of generators under disturbances. In Ecuador, the National Electricity Operator (CENACE) uses the WAProtector tool, which includes a module for static angle stability analysis. This tool receives real-time data from Phasor Measurement Units (PMUs) installed in the National Interconnected System (SNI). The objective of this work is to establish static angle stability limits between adjacent buses, which must be configured within WAProtector. To achieve this, a methodology based on the equal area criterion is proposed, applied to data obtained through simulations using DIgSILENT PowerFactory software and validated with historical records from WAProtector. The study focuses on seven transmission lines of the SNI, selected due to having complete and reliable information both in simulation and in the WAMS system records. The results show that critical angle values range between 45° and 50°, and that in most cases, the system reaches thermal limits before angular stability limits. This methodology offers a practical solution for defining reliable operational limits in monitoring tools for the Ecuadorian power system.
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