COMPARISON OF DYNAMIC PERFORMANCES OF STATCOM, SSSC, IPFC AND UPFC ON INTER-AREA OSCILLATION DAMPING

Abstract

Maintaining the stability of the power systems and ensuring the sustainability with sufficient reliability are two important challenges. Inter-area oscillations are one form of low frequency oscillations generally range between 0.1-0.8 Hz. These oscillations may occur between one group of generators in one area and another group of generators in another area that are separated by a long distance. Even a small change in the operating point in the interconnected system may trigger this phenomenon. Therefore, once detected, it is necessary to damp out these oscillations efficiently which may lead to total blackout the system in the worst case. Since Flexible Alternating Current Transmission Systems (FACTS) devices can control multi-power system parameters simultaneously and independently, FACTS devices have a high application potential and can be considered as one of the most viable solutions to damp out inter-area oscillations in an effective manner. This paper aims to show that major types of voltage source converter based FACTS devices are able to damp out inter-area oscillations successfully. The studied FACTS devices in this paper are Static Synchronous Compensator, Static Synchronous Series Compensator, Interline Power Flow Controller, and Unified Power Flow Controller. Furthermore, the dynamic performances of these FACTS devices are also compared based on the simulated case studies on Kundur 2-Area System. Of these FACTS devices, it is shown that UPFC is the most effective FACTS solution to mitigate inter-area oscillations.

Keywords

• Static Synchronous Compensator
• Static Synchronous Series Compensator
• Interline Power Flow Controller
• Unified Power Flow Controller
• Inter-Area Oscillation

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