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Line Commutated Converter High Voltage Direct Current Based Supplementary Controller for Small-Signal Stability Enhancements

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Abstract:

HVDC transmission systems are a prominent technology that enables efficient and economical long-distance power transmission and have potential advantages over HVAC transmission systems, such as leveraging the integration of asynchronous grid and RES to enhance reliable power supply. Still, its dynamic characteristics and ability to stabilize under small disturbances impose complexities to the overall system stability. With the objective of improving small signal stability in HVDC systems, this study investigated supplementary control strategies to dampen interarea power oscillations. Subsequently, this work proposed a strategy to implement an HVDC-based POD controller in the LCC-HVDC system to enhance small signal stability and ensure the reliable and secure operation of power systems. This study investigated the proposed strategy using the Kundur Two Area Four Machine system developed in PSCAD using three case studies with a three-phase to ground fault. The case studies are as follows: (i) base case of K-TAFM, (ii) integration of LCC-HVDC, and (iii) proposed HVDC-based POD controller with LCC-HVDC. The effect of the proposed HVDC-based POD controller gain has also been investigated in this paper. The comparative analysis between the LCC-HVDC POD-controlled system and the traditional LCC-HVDC configuration highlighted the superior performance of the POD controller across all key metrics, including damping ratios, settling times, and overall system resilience. Despite these advancements, the paper suggests further optimization, particularly through adaptive control strategies, to ensure robust performance under dynamic real-world conditions.

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Periodical:

International Journal of Engineering Research in Africa (Volume 76)

Pages:

33-51

DOI:

https://doi.org/10.4028/p-TqWvj8

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Online since:

November 2025

Authors:

Seluleko Sikhakhane*, Rudiren Sarma

Keywords:

High Voltage Direct Current, Interarea Oscillations, Kundur Two-Area Four Machine, Line Commutated Converter, Power Oscillation Controller

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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