Open Access

ARTICLE

Two-Stage Location Method for TCSC Considering Transmission Congestion Alleviating Coherence

Fan Chen^*, Xian Bao, Jianlin Liu, Man Wang, Qiang Zhang

School of Electric Power Engineering, School of Shenguorong, Nanjing Institute of Technology, Nanjing, 211167, China

* Corresponding Author: Fan Chen. Email:

Journal on Artificial Intelligence 2025, 7, 365-380. https://doi.org/10.32604/jai.2025.069903

Received 02 July 2025; Accepted 10 September 2025; Issue published 06 October 2025

Abstract

The Thyristor-Controlled Series Compensator (TCSC) presents an effective solution for mitigating transmission congestion in power systems by regulating the distribution of line power flow. However, inherent faults within the TCSC may lead to an unintended intensification of transmission congestion in other sections of the system post-installation, resulting in non-coherent phenomena of line blocking. In response to this challenge, this paper introduces a novel two-stage site selection method for TCSC, emphasizing the enhancement of coherence in addressing line-blocking issues. Through rigorous non-coherent verification, this method mitigates the risk of line congestion deterioration due to TCSC faults. In the initial stage of the proposed method, TCSC faults are not considered during the extraction of system states. System state analysis is performed based on the TCSC site selection model, aiming to minimize system load reduction. The preliminary recommended installation position for TCSC is determined by sorting the frequency of TCSC installation occurrences on lines extracted from the analyzed system states. In the subsequent stage, accounting for the influence of TCSC faults on line faults, system operating states are extracted. Line and system congestion indices are calculated through the statistical analysis of the system state analysis results. The installation of TCSC at the preliminary position is scrutinized to identify non-coherent phenomena of line congestion on other lines. If such phenomena are observed, the installation position is excluded, and the TCSC site selection process is reinitiated based on the methodology from the first stage. To validate the effectiveness of the proposed method, a case study is conducted on a modified RBTS test system. The case study results indicate that, compared with TCSC siting schemes that do not consider transmission congestion non-coherency, the proposed non-coherency-based siting scheme reduces the system congestion expectation (SCE) and system congestion probability (SCP) by 17.7% and 11.4%, respectively, while lowering the LOLP and EENS by 2.56% and 4.55%, respectively. These results demonstrate that the proposed method can effectively alleviate transmission congestion and enhance the overall reliability of the system.

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Keywords

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