A novel day-ahead scheduling approach for multi-power system considering dynamic frequency security constraint

Abstract

The ever-growing proportion of renewable energy results in the decrease of frequency regulation capability of the multi-power system. Hence, to ensure the stability of the multi-power system with a high proportion of renewable energy, a novel day-ahead scheduling approach is proposed considering the frequency security constraint. Firstly, the dynamic changing process of frequency due to the power disturbance is analyzed. Secondly, a frequency security constraint considering the dynamic process is modeled and incorporated into the scheduling model of the multi-power system. The proposed scheduling model ensures that the maximal frequency deviation of the dynamic process is kept within the permitted range. Next, to ensure the stable operation of the system and make full use of renewable energy, the proposed scheduling model aims at minimizing the net load fluctuation and intermittent new energy curtailment. Finally, simulation results show that the proposed optimal scheduling model considering dynamic frequency security constraint can maintain the stability and frequency security of the multi-power system under power disturbance.