Supplementary Controller on Multi-Terminal Direct Current Link for the Damping of Interarea Power Oscillation of Kundur Two-Area Four-Machine System for Sustainable Grid Network

Abstract

Inter-area power oscillations, a condition where a group of generators in different areas oscillate against each other, are becoming hard to control due to the recent complexity of power systems. This paper aims to enhance the stability of the modified Kundur two-area-four-machine network model, focusing on the implementation of a robust secondary controller on line commutated converter based multi-terminal high voltage direct current systems. This effort is to provide a better sustainable means of power transmission. The proposed solution entails integrating a local generator controller and a robust controller specifically designed to further mitigate inter-area power oscillations. This study conducted three operational scenarios: the local generator controller with double circuits alternating current lines, the local generator controller with multi-terminal direct current system controllers, and the local generator controller with direct current controllers and a secondary controller. Simulation results, executed using electromagnetic transient simulation engine on power systems computer aided design, demonstrated notable improvement in damping inter-area power oscillations with the incorporation of multi-terminal direct current system. A substantial enhancement of 100% in dampening inter-area power oscillations was observed upon implementing a secondary controller on the multi-terminal direct current system. 

Keywords

• lcc hvdc multi-terminal dc system; small signal stability; interarea power oscillations; two-area-four machine network; supplementary controller;