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Abstract
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A growing number of renewable energy sources (RESs), rapid load changes, and increasing power demand pose stability challenges for power grids. Many power systems are operating near voltage stability limits due to rising power demands, limited generation sources, and delays in transmission system development projects. It is therefore crucial to assess the voltage stability of power systems online in this situation in order to ensure stable operation of the system. On the other hand, real-time voltage stability assessment is essential for ensuring the reliable and efficient operation of electrical power systems. By continuously monitoring voltage stability parameters and promptly identifying deviations from normal conditions, operators can take immediate corrective actions to prevent voltage instability events, service disruptions, and equipment damage. The real-time assessment also enables operators to optimize power system operation, integrate renewable energy sources effectively, and enhance grid resilience against emerging challenges. Thus, in this paper, a new real-time index for voltage stability assessment is introduced. Comparative studies between the existing voltage stability indices (VSIs) and the proposed index have been performed to comprehensively highlight the indices’ foundation, performance, and overall behavior. The effect of distribution systems is investigated in this study using integrated transmission and distribution system modeling. Also, the proposed index can be used for both types of radial and ring power systems. The results on an IEEE 3-bus system and a 14-bus system prove the effectiveness of the proposed index in accessing voltage stability.
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