Damping Inter-area Oscillations through Decoupled Modulations

The objective of this proposed work is to develop decoupled modulation control for damping inter-area low frequency oscillations, so the damping control can be more effective and easier to design with less interference among different oscillation modes in the system.  To minimize the interference and improve effectiveness, this proposed work will develop a decoupled modulation control mechanism oriented for being used in conjunction with advanced power flow control devices such as FACTS and HVDC transmission. Wide-area signals will be evaluated and chosen such that observability of the oscillation mode is ensured. A method to decouple the signals will be developed to separate oscillation frequency contents, and the modulation controller will be designed accordingly for a specific frequency content, so each controller mainly affects one mode.