Voltage stability-based PMU placement considering N− 1 line contingency and power system reliability

New PMU placement algorithm considering network connectivity, zero injection bus, reliability of N-1 line contingency and voltage stability performance (enhancing Voltage Stability Index) are proposed in this work. Reliability and voltage stability level are selected to determine the security level of Wide Area Monitoring System and priority bus. Optimization problem is formulated by minimizing the number PMU installed and maximizing the coverage N-1 contingency and solved using Binary Integer Linear Programming. For showing the performance of proposed method, IEEE 57-Bus test bus system is used as test system, which shows flexible result of PMU number and location depending on the desired reliability and voltage stability level.