Cluster-Based Decoupled Voltage Sensitivity Analysis Under Unbalanced Grid Condition

the modernization of the power grids towards smart grid is currently on the way. To cope with energy transition, decentralization of traditional active grid operation and control to distribution grids is required, as distributed generation (DG) units are present. Clustering power systems approach (CPSA) has been developed to enable consistent decentralized operations in the grids. In this paper, a method of decoupled voltage sensitivity analysis based on the CPSA is proposed to assist the use of the DG units in decentralized areas under unbalanced grid condition. The analysis utilizes only measurement data gathered from phasor measurement units. To perform the analysis method, the impedance model of each area is first determined. Based on the impedance model, the sensitivity analysis of bus voltages and their respective angles can be then conducted. The proposed method is verified by a simulation on a low-voltage distribution grid. The results prove that the proposed method can be efficiently used for decoupled voltage sensitivity analysis.