An Adaptive Load-Shedding Method for Renewable Integrated Power Systems

Abstract

The risk of a blackout or system failure is growing as power networks get more complicated and larger on a regular basis as a result of rising demand and the adoption of contemporary technologies. Frequency stability plays a vital role for the safe operation of a power system. A power system's potential to go dark increases if its frequency abruptly increases or decreases. Frequency stability can be preserved by using an adaptive load-shedding technique to combat generation loss. In some circumstances, typical load shedding strategies struggles to deliver an adequate frequency response. This paper proposes a new dynamic-adaptive load shedding method as a solution to this problem. The proposed technique realizes the necessary crisis scenario, frequency variation caused by load damping, and ranking of load buses based on both frequency and voltage stability parameters, as well as the utilization of energy storage units (ESU) i.e. Battery Energy Storage System. The proposed method is used in conjunction with the IEEE 39 bus test system to evaluate its performance. Simulation results show that 201 MW, 451 MW of load shedding are necessary for generation loss occurrences of 600 MW, 800 MW respectively to maintain post-incident system frequency higher than the threshold value of 49.1 Hz. The proposed methodology ensures minimal adaptive load shedding in order to maintain satisfactory operation of the power system maintaining stable frequency and voltage margins.