Unit Commitment with Primary Frequency Regulation Consideration in the Southern Sulawesi Power System

Abstract

To increase the penetration level of renewable energy generation, the readiness of the existing power system needs to be considered, especially in terms of the system’s ramping rate and frequency response capability. Even, a high penetration level of renewable energy can potentially reduce generating units generation cost, the system capability to perform the frequency response is decreased. For this reason, the quality of the frequency response needs to be considered in operation planning. In this paper, a unit commitment model was developed with considering the adequacy of primary frequency regulation (PFR). The effect of PFR constraints was analyzed by comparing the scheduling results and the frequency response with the conventional UC models. The result of this research shows that by considering the PFR constraints, the optimization results in an increasing number of committed generating units, thus resulting in more distributed reserves. The additional constraints increase the conventional unit generation costs from $48,017 to $51,636 on the simulated scenario. However, the proposed model shows its advantages in the system dynamic frequency performance, shown by an increase in frequency nadir and steady-state frequency of 490 mHz and 70 mHz respectively during low load conditions.