Decoupled Voltage Sensitivity Analysis for Decentralized Smart Grid Operation

The presence of renewable energy sources in distribution level requires decentralization of traditional active grid operation and control to distribution grids. An approach allowing this decentralization is clustering power systems approach (CPSA). In this paper, a method of decoupled voltage sensitivity analysis based on the CPSA is proposed for online power dispatch management of the DG units in separate decentralized areas. The analysis employs only measured voltages and currents acquired from phasor measurement unit (PMU). First, bus impedance parameters in each area are calculated. With the impedance parameters, sensitivity of bus voltages and their corresponding angles to the change of active and reactive powers can be then analyzed. The validation of the proposed method is performed in a simulation in low-voltage distribution grids, in which the proposed method is assumed to be implemented. The results prove that the proposed method can be efficiently used for decoupled voltage sensitivity analysis.