Single-Machine Frequency Model and Parameter Identification for Inertial Constraints in Unit Commitment

Sung-Eun Kim and Yeong-Han Chun
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Sung-Eun Kim: Department of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea
Yeong-Han Chun: Department of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea

Energies, 2021, vol. 14, issue 18, 1-19

Abstract: In recent years, the need for generation mixes that consider the inertial constraints in unit commitment (UC) has increased because the inertia of these systems has decreased with the increased use of renewable energy. In these circumstances, single-machine models can calculate the minimum frequency and rate of change of frequency (RoCoF) at a high speed in terms of the characteristics of the changes in the generation mix, in order to identify the generation mixes that can satisfy inertial constraints. This study proposed methods to determine the parameters of the reduced frequency response (RFR) model, which is a single-machine model that considers the nonlinearity caused by restrictions on the generator’s output power, in order to apply inertial constraints to UC. The RFR models can include various forms of governor models and consider the nonlinear response characteristics of restrictions on the generator’s output power that change according to the scales of contingencies, system inertia, and changes in load characteristics through these parameters. From the simulations of real systems, it was observed that the parameters determined through the proposed methods achieved considerable accuracy in calculating the minimum frequency and RoCoF with the RFR model.

Keywords: isolated system; minimum frequency; parameter identification; rate of change of frequency; single-machine model; system frequency response model; turbine-governor model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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