University of Mohaghegh Ardabili Journal of Operation and Automation in Power Engineering 2322-4576 13 4 2025 12 01 Voltage Stability Assessment of Power System Using Line Indices with Wind System and Solar Photovoltaic Generation Integration 303 314 2950 10.22098/joape.2024.13429.2028 EN Santosh Kumar Gupta Department of Electrical Engineering, National Institute of Technology, Patna, Bihar, India. Sanjeev Kumar Mallik Department of Electrical Engineering, National Institute of Technology, Patna, Bihar, India. Journal Article 2023 08 02 Due to the exponential increase in electricity demand, the power system is being operated at its stability limit. Due to the scarcity of natural resources, the generation can not be increased. Hence, there is always a possibility of voltage collapse in the system. The voltage collapse can be predicted by a number of line stability indices available in the literature. The stress level of the power system can be mitigated by integrating renewable energy resources, such as wind and solar energy. Under heavy loading conditions, the transmission lines get stressful which can be predicted by line voltage stability indices. In this paper, three line stability indices, namely, Lmn, fast voltage stability index (FVSI), and Lqp are used to identify the most stressed lines under four types of system loadings for ensuring the corrective measure to avoid this voltage instability. These indices are being evaluated using continuation power flow. The system loadability and stability are enhanced by deploying the wind energy and solar PV generation at the most appropriate location. The integrated test system includes wind and solar energy systems at one of the most severe bus, and the performance of the system is confirmed by computing the power flow (PF) using the integrated test system's line indices and the power system analysis toolbox (PSAT). The proposed approach has been validated on IEEE 14 and 118-bus test systems in MATLAB/PSAT with the deployment of wind energy and solar energy at a suitable location. https://joape.uma.ac.ir/article_2950_606015ed082ff7c7a3fd88f1acbc5c69.pdf