Forced oscillation damping controller for an interconnected power system

Forced oscillation (FO) is a challenging problem as it could initiate power system instability due to resonance, especially when the frequency of FO and inherent electromechanical (EM) modes of power system coincide. Twin oscillation components (i.e. inter-area oscillation and FO in the range of 0.1-Hz to 0.8-Hz) are created due to uncertain and uncaptured oscillatory inputs in power systems. The FO may lead to power system instability even with very well-damped EM modes. Therefore, effective countermeasure, i.e., a FO damping method should be incorporated to suppress the FO. This paper presents the systematic design and development of a controller termed as a Force Oscillation Damping Controller (FODC) for damping FO considering uncertainties and disturbances. The FODC and conventional inter-area damping controller are activated at different stages to make sure both controllers operate effectively. An adaptive algorithm is applied to make sure that the FODC can keep the FO mode in stable region at all operating conditions. The FO detection using an event-triggered control is applied to start the operation of FODC during the forced disturbance. Study results in IEEE 14-machine South East Australian (SE-A) interconnected power system demonstrate the efficacy of the proposed FODC in damping major FOs.