Unit Commitment and Load Dispatch Problems Considering Inertial Response of Dispatchable Generators

Abstract

The growth in penetration of renewable energy sources leads to reduction in the number of grid-tied dis-patchable synchronous generators. Since the contributions of non-dispatchable, renewable energy-based generators to both grid inertia and grid frequency controllability are significantly small, it becomes important to secure sufficient operational margins in the operation scheduling phase. This paper presents a framework that integrates constraints for the inertial response and the primary frequency control to the unit commitment and economic load dispatch (UC-ELD) problem. The authors' proposal contributes cooperative operations of dispatchable and non-dispatchable generators in the levels of inertial and primary responses although the UC-ELD is a framework for operations in longer period. Through numerical simulations and discussion on their results, the validity of the authors' proposal is verified.