Abstract
The unified power flow controller (UPFC) has the possibility to damp power system oscillations more effectively than power electronics applied devices such as SVG and TCSC. In this paper, a control system design of a UPFC for power system damping enhancement based on eigenvalue control method was proposed. As a result, it was made clear that the best design method is to determine steady-state value of UPFC control variables and control parameters of UPFC such as gains and time constants simultaneously because controllability of UPFC depends on the steady-state values of UPFC and the power flow condition. A UPFC control system, taking into account the ratings of power converters, is proposed. The effectiveness of the proposed control is verified by the digital time simulation.
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