Abstract

ONI, Oluwafemi E.; SWANSON, Andrew G.  and  CARPANEN, Rudiren Pillay. Small signal stability analysis of a four-machine system with placement of multi-terminal high voltage direct current link. J. energy South. Afr. [online]. 2020, vol.31, n.1, pp.73-87. ISSN 2413-3051.  http://dx.doi.org/10.17159/2413-3051/2020/v31i1a7430.

Inter-area oscillation caused by weak interconnected lines or low generator inertia is a critical problem facing power systems. This study investigated the performance analysis of a multi-terminal high voltage direct current (MTDC) on the damping of inter-area oscillations of a modified two-area four-machine network. Two case studies were considered, utilising scenario 1: a double alternating current (AC) circuit in linking Bus_10 and Bus_11; and scenario 2: a three-terminal line commutated converter high voltage direct current system in linking Bus_6 and Bus_11 into Bus_9. It was found that scenario 2 utilising MTDC link with a robust controller provided quick support in minimising the network oscillations following a fault on the system. The MTDC converter controllers' setup offered sufficient support for the inertia of the AC system, thus providing efficient damping of the inter-area oscillation of the system.

Keywords : multiterminal direct current; MTDC link; inter-area oscillation; generator inertia; thyristors converter; high voltage direct current; converter controller.

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