Maximum permissible loading of a power system within voltage stability limits using Thevenin parameters

摘要

Estimating the proximity of power system to voltage collapse in real time still faces difficulties. Beside the data management and computational issues, any central-control method is subject to the reliability of long-distance data communications. On-line determination of the maximum permissible loading of a power system is essential for operating the system with an adequate security margin. A very simple and straightforward method of determining the maximum permissible loading and voltage stability margin of a power system using information about the current operating point is proposed. The method simply requires some locally measurable quantities, such as bus voltage magnitude, and active and reactive components of load power. The measured data are carefully processed to estimate the maximum permissible loading and voltage stability margin of a system