Voltage Collapse Sensitivity in Power Systems
|F.A. Althowibi 1 ,M.W. Mustafa 2
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Voltage instability and voltage collapse have been considered as a series threat to power system operation. Fast response and accurate voltage stability indications in power systems are still a challenging task to achieve, particularly when power systems operated close to its transmission capacity limits. A successful avoidance of system collapse is based on method accuracy and its low computation time. This paper presents simple, fast and efficient indices for analysing power system voltage stability and successfully predicting system voltage collapse. Four indices are proposed; which are based on the gradient of generated powers with respect to load components producing sensitive voltage stability indications.The SPqandSQp response sensitively when real load power changes with clear and readable indications while SPqandSQqmeasured system sensitivity to any demanded reactive power changes. This describes clearly the dynamics of power transfer through the transmission systems and how the system responses to load changes indicating how the system regain its load-generation equilibrium when load rate changes. A demonstration on the IEEE 14-bus, 57-bus and 118-bus systems are presented to validate the propose indices’ efficiency and accuracy.