Voltage Security Assessment with Application of PMUs Using Decision Tree

This paper presents voltage security assessment with application of Phasor measurement unit (PMU) using Decision Tree (DT). An algorithm is developed by CART to identify the most sensitive buses which are most viable and hampered the security of power system. Such buses are ranked in terms of their index called joint bus ranking. PMUs are costly devices and should be placed only on such buses which affect the security most. Therefore only top ranked buses are selected to place the PMUs instead of all buses. On comparisons between PMU placed at all buses with optimally selected PMU buses, classification accuracy is observed more for optimally selected PMU buses. As numbers of PMUs are reduced with higher classification accuracy, reduces the cost of PMU devices in overall system. Implementation of PMUs in system will certainly enhance the reliability of the system equally and would avoid the blackout.