Damping Enhancemnet for LFO in Electric Grid Hosting Low Inertia Power Generation

Power systems exhibit non-linear behavior due to the dynamics of synchronous generators (SGs), power flows, and electromagnetic transients. Continuous load changes, network variations, and faults lead to small-signal instability (SSS) arising at low-frequency oscillations (LFOs) from 0.1 Hz to 2.5 Hz. These oscillations, further propagated by power system controller and leads to narrowing done the limit of power transfer in critical corridors. Effective tuning of power system stabilizers (PSS) is essential for enhancing LFO damping, though challenging in large systems. Low inertia generators integration adversely propagates the LFO and this leads to shifting of inter-area modes in toward instability region. This research article aimed to explore the impact of increasing share of low inertial generation on movement of inter-area oscillation modes and proposing an effective solution for enhancing the damping against low frequency oscillation propagated with high penetration of renewables generation in electric grid. A multi-step computation of based on aggregated damping sensitivity index to identify a passive location for RES integration has been identified for enhancing damping against different LFO in electric grid. It is observed that aggregated damping sensitivity index gives a better response for damping for inter-area and local modes oscillation and prevents the drifting of Eigen values towards the instability region.