Maximum permissible loading and Static voltage stability limit of a power system using V-I polynomial

P-V or Q-V curve are commonly used to determine the maximum permissible load or static voltage stability limit of a power system. Voltage versus current relation approximation is presented as a tool to assessThe voltage stability limit.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 current data at present operating point. The measured data are carefully processed to estimate the maximum permissible loading and voltage stability margin of a system. The proposed method is tested on IEEE 6-bus and 14-bus system