INERTIA CONFIGURATION METHOD TO ENHANCE FREQUENCY STABILITY OF POWER GRIDS CONSIDERING THE SPATIAL DISTRIBUTION CHARACTERISTICS

When a disturbance occurs in the power grid, the frequency of the grid changes. It is essential to make sure that the grid frequency following specific disturbances stays within safety limits. In the early stages of the frequency response following a disturbance, the rate of change of frequency (ROCOF) is the most critical parameter for indicating frequency stability and the inertia is the dominating impact factor. A well-designed configuration of system inertia can help enhance frequency stability to make meet requirements. This paper first examines the spatial distribution of system frequency after a disturbance, and based on this analysis, proposes an optimal inertia allocation method. Specifically, this model increases node inertia by incorporating energy storage at strategic nodes. By ensuring a certain total amount of added inertia, the proposed model aims to minimize the maximum ROCOF possible. Finally, simulation tests conducted on IEEE 68 BUS show that the proposed method can effectively reduce the maximum ROCOF following a disturbance, which ensures the power grid's safe operation.