Comparison of Dynamic Performances of IPFC, UPFC and Back-To-Back HVDC Transmission on Damping of Power System Oscillation

The permanent goal in the field of electrical power systems is to find new ways of transmission and distribution of electrical energy in terms of low cost and reliability. Due to increasing growth in power demand, transmission side of the power systems has faced with stability problems much ever than before. Local and inter-area oscillations are the important types of these stability problems which are the results of insufficient/inadequate damping in the power systems. These oscillations can be observed as the swinging of system parameters such as buses voltages, phase angles, and real/reactive power flow on transmission lines. These oscillations are due to the normal change in the increase or decrease of sudden load or external changes such as a fault occurs in the system. The purpose of this thesis is to research the damping of both local and inter-area oscillations by using three different types of power electronic based compensators. These devices are as follows: "Unified Power Flow Controller (UPFC)", "Interline Power Flow Controller (IPFC)" and "Back to Back High Voltage Direct Current (BTB-HVDC) Transmission". UPFC and IPFC are voltage source converter based FACTS devices. BTB-HVDC is also voltage source converter based one which are mostly preferred in long transmission of bulk power. In the thesis, "Kundur System" and IEEE 9-Bus System" are used as example power systems to test the dynamic performances of the aforementioned devices on damping of both local and inter-area oscillations.