Bus Voltage Sensitivity Index Based Approach Against Voltage Collapse in Distribution Systems

The implementation of voltage collapse mitigation measures in power distribution systems was investigated through a bus voltage sensitivity index (BVSI) optimization method in this paper. Bus sensitivity analysis in a power system network uses voltage performance index optimization approaches to find weak buses that are vulnerable to voltage collapse. This paper proposed a method to identify those weak buses. Through the evaluation of headroom capacity of the network, the identified weak buses are then optimally connected with distributed generation (DG). This will have an impact on network voltage improvement, power loss reduction, and overall network reliability. The IEEE 14 bus distribution network system is used to test the effectiveness of the proposed method. The results suggest that among all of the identified candidate buses, buses 12 and 14 are vulnerable to system voltage failure. However, bus 14 has the highest sensitivity index, hence the best optimal location for DG. The results also show that those susceptible buses for voltage collapse were improved and power loss was reduced to 10.32% after the mitigation measures were applied.