PSO based OPF technique ensuring small signal stability

This paper presents a simple and efficient Particle Swam Optimization (PSO) based algorithm for solving Small Signal Stability Constrained Optimal Power Flow (SSSCOPF) problem. The proposed economic dispatching methodology is based on an Optimal Power Flow (OPF) problem that explicitly considers small signal stability security limits, hence appropriately termed as SSSCOPF. The SSSCOPF problem is solved using PSO based algorithm and the Eigen value analysis is performed to assess the system stability for the normal operating condition and subsequently for stressed operating condition by considering single line outage. The proposed PSO based algorithm for solving OPF and SSSCOPF problems is tested on an adapted IEEE 30-bus system. The optimal solutions obtained for the OPF problem with and without small signal stability security constraints are compared and analyzed. The comparative analysis reveals that the proposed PSO based algorithm converges to the optimal solution without any constraint violations and the system is under stable operation pertaining to the normal and contingency cases.