Application of a Damping Torque Analysis index for coordinated tuning of stabilisers in a large power grid

This paper considers the coordinated tuning of stabilisers attached to the primary control loop of a Synchronous Generator (SG), Doubly Fed Induction Generator (DFIG) and Energy Storage System (ESS) in a large-scale electric power grid. The indices obtained from a Damping Torque Analysis (DTA) method are used to evaluate the impact of different stabilisers subject to a range of low-frequency oscillations. According to the DTA Indices, a coordinated stabiliser-tuning strategy is proposed. Selected stabilisers are tuned effectively to dampen target oscillations without rendering eigenvalue drift. The damping ratios of interarea oscillation modes and local modes can be increased beyond nominal values, without time-intensive and redundant-stabiliser adjustment.