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Modern power systems with high share of renewable generation are at the riskof rapid changes in frequency and inertia resulting from contingencies. Theimportance of an accurate assessment of system and load relief, as well asfrequency changes in the critical timescales is more pronounced in these powersystems. This knowledge serves as an insight which will guide the solutionsrequired for enhanced security and resilience. A novel procedure forsimultaneously assessing system inertia and load relief using a closed-formsystem frequency response (SFR) model to fit measured disturbance data ispresented. Results of applying the proposed approach on generator contingenciesin the South West Interconnected System (SWIS) in Western Australia demonstratethe validity of the method and indicate that it can overcome some of thelimitations observed in conventional inertia estimation methods based on thelinearised swing equation, such as the sliding window and polynomial fitmethods.

Joint Estimation of System Inertia and Load Relief