Transient stability constrained optimal power dispatch with linear ramping model

This paper describes the application of modified Particle Swarm Optimization (PSO) called Fitness Distance Ratio PSO (FDR PSO) algorithm to determine the optimal power dispatch of the Independent Power Producers (IPP) in deregulated environment. Generally the power producers must respond quickly to the changes in load and wheeling transactions. During this process, the ramping cost must be incurred if the ramp rates of the power producers exceed the elastic range. In this paper, optimal production costs of the power producers are computed with ramping cost with stepwise and piecewise linear ramp rate limits. Transient stability limits of the power producers and physical transmission line limits with contingency are also considered while solving the Optimal Power Flow problem. The proposed algorithm is demonstrated on a practical ten bus system and the results are compared with other optimization methods.