Abstract
Fault-induced delayed voltage recovery (FIDVR) phenomenon refers to delayed voltage recovery after the occurrence of a fault on the transmission level, caused by the presence of induction motor (IM) loads at the distribution level. Load shedding (LS), which reduces the imbalance of the requested and generated power in the network, is one of the most effective ways to deal with the FIDVR. This paper proposed a wide-area LS strategy based on the voltage estimation process. At first, a process for online voltage estimation is presented using three-order model of IM and modified Gauss-Seidel load flow. This process is used to identify FIDVR-involved buses and verify the calculated amounts and locations of loads to be shed. These variables are calculated through a repetition-based optimization problem, linearized and converted to mixed-integer linear programming form to reduce calculation time. The proposed LS strategy is implemented on the IEEE 118-bus network and the simulation results confirm the efficiency of the proposed method compared to previous ones. The proposed strategy could mitigate the critical FIDVR of all buses with less load to be shed from fewer buses.
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