Proposing a Rule for VSC-HVDC Optimal Placement to Improve Transient Stability of Power System

Abrishami Moghaddam, Ali; Sobbouhi, Alireza; Vahedi, Abolfazl

doi:10.48308/ijrtei.2024.235215.1041

Proposing a Rule for VSC-HVDC Optimal Placement to Improve Transient Stability of Power System

Document Type : Research Article

Authors

Ali Abrishami Moghaddam ¹

Alireza Sobbouhi ²

Abolfazl Vahedi ¹

¹ Electrical Department, Iran university of science and technology (IUST), Centre of Excellence for Power System Automation and Operation Electrical Engineering Department, Tehran, Iran

² Electrical department, Shahid Beheshti university, Tehran, Iran

10.48308/ijrtei.2024.235215.1041

Abstract

Transient stability indicates the system's ability to dampen the rotor oscillations of synchronous generators after severe faults. The transient instability causes considerable damage to the generator and reduces the production capacity in the network. In this paper, at first, using the simulation and replacement of individual transmission lines, the behaviour of synchronous generators against severe faults and the impact of replacing conventional AC transmission lines with VSC-HVDC (Voltage Source Converter-High Voltage Direct Current) systems are investigated. The critical fault time (CCT) is considered as the stability indicator. In the second step, AC transmission lines are replaced by VSC-HVDC lines to investigate the amount of stability improvement by different placement. Ultimately, to avoid many simulations, a criterion is proposed for optimal placement of the HVDC system in the power grid. This criterion finds the most critical generator in the system and the most efficient AC transmission line replacement by HVDC. The results show the proposed criterion can reduce the computational burden with appropriate accuracy and also the using of HVDC systems is effective in improving the transient stability of power systems. Also, a suitable criterion for locating and replacing the HVDC system has been proposed.

Keywords

Critical generator

Critical transmission line

Transient stability

VSC-HVDC

Stability improvement

Subjects