Power Oscillation Damping Using Converter- Interfaced Generators under Constrained Active and Reactive Powers

Low-frequency oscillations in power systems have been commonly damped by using additional loops in the control system of synchronous generators. With the massive integration of converter-interfaced generators (CIGs), power system operators have recently started requesting the same power oscillation damping (POD) capability from those power plants as well. CIGs are known to have a flexible active and reactive control for providing POD services. However, their active and reactive power injection is highly constrained by the CIG operational limits. In this paper, a method for designing a high-performance POD algorithm for CIGs taking into consideration active and reactive power constraints is presented. This method uses all the available active and reactive power to maximise the POD effectiveness. The design procedure is based on frequency response techniques and only an estimate of the frequency response at the frequency of power oscillation is required. The proposed methodology is tested on a two-area power-system model, with an additional CIG. Electromagnetic simulations performed in Matlab and SimPowerSystems are used to validate the main contributions of this work.