Study on the role of transmission lines in network strengthening and influencing the power system inter-area modal characteristics Online publication date: Thu, 21-Oct-2021
by Sirin Dutta Chowdhury
International Journal of Energy Technology and Policy (IJETP), Vol. 17, No. 4, 2021
Abstract: Inter-area modes having inherent poor damping pose serious threats to the power system stability. These modes restrict the power transfer capacity of the transmission lines and hence need to be stabilised. In this paper, a simple and practicable method based on the modal analysis technique and the transmission system augmentation approach has been demonstrated which strengthens the power system network by damping its oscillatory modes. This technique also gives a fair idea regarding the optimal locations for different controllers' placement. A novel index namely 'mode contribution factor' has been introduced which quantifies the impact of the oscillatory modes on the synchronous machines. This paper also demonstrates the application of cut-set stability criterion to the improvement of the system damping. The proposed method has been validated using IEEE 16-machine 68 bus and IEEE 10-machine 39 bus test systems. The results have been compared to several published works and found to be in line with them.
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