Optimize the UFLS Implementation Scheme: Consider Reducing the Civil Load

UFLS is one of the last remedial actions and also the most fundamental tool against frequency collapse. Nowadays, growing renewable energy penetration and grid complexity impose higher risk of system blackouts. The frequency fluctuation is more dramatic. Therefore, the necessity of establishing a feasible and effective UFLS implementation scheme even more stands out. Furthermore, the stable supply of civil load is emphasized by the government and the grid company. This paper takes account of reducing civil loads when making the proper UFLS implementation scheme. It provides a way to establish a robust scheme by using the abundant load information and multi-dimensional evaluation indicators efficiently. Furthermore, an approach is put forward to decrease the civil loads and guarantee the effectiveness of the schemes at the same time.