Identification of Weak Bus in the System for Voltage Stability Analysis by Using Fast Voltage Stability Index

In today’s intricate power systems, the evaluation of voltage stability is crucial. Due to restricted power sources and rising power demands, the system operates at its full capacity. Therefore, in order to take the appropriate precautions to prevent system capacity violation, a study that can identify the maximum capacity limit before voltage collapse must be conducted. In this work, the Fast Voltage Stability Index (FVSI) is derived from the voltage stability index referenced to a line that was started from the voltage quadratic equation at the transmitting end of a depiction of a two-bus system. A line index value around 1.00 in an interconnected system means that the line’s instability limit has been achieved, which may result in an abrupt voltage drop on the related bus due to a change in the reactive load. The developed index was tested on the IEEE 5, 9, and 14 buses to confirm that the suggested indication worked as intended. This method is predictive in estimating the chance of a system failure, allowing for the taking of appropriate measures to prevent such an occurrence.