A New Computational Method of Electrical Distances for Modern Power Grid: Voltage Stability-Based Method

Voltage Stability Analysis is necessary for power system operation and control, especially with the rapid growth in the integration of Renewable Energy Sources (RESs). The voltage stability analysis is mainly based on the corresponding dependencies of bus loading margins and preventive/corrective controls. This study provides a new computational method of electrical distances based on voltage stability analysis. The derived electrical distances can represent how the preventive/corrective control on a particular node can improve the loading margins on other nodes. The proposed method is derived by performing sensitivity analysis on a real-time voltage stability indicator with respect to preventive controls. It also depends on real-time measurements, making it a good monitoring method for system operation. The computational efficiency of the proposed method is high and thus it is appropriate for real-time applications. The electrical distances are normalized and thus they can vary between "zero" and "one". The main applications of the proposed method of electrical distances are preventive control selection and network clustering. The proposed method is validated on the IEEE 118-bus network.