Improving voltage stability by optimal reactive power dispatch based on genetic algorithm and linear programming technique

Abstract

Minimization of voltage deviations and power loss can be controlled by optimal reactive power dispatch for voltage stability of the system. This paper presents Genetic Algorithm approach for system parameters enhancement and optimal reactive power dispatch. The transformers tap changers, generator exciters, switchable VAR sources are used as control variables for improvement of system parameters. The proposed methodology is based on the minimization of voltage deviations at load buses. The suggested approach permits the optimization variables to be presented in their natural form in the genetic population. For effective processing of Genetic Algorithm (GA), scattered crossover, constraint dependent mutation and double vector population operator which can directly deal with the floating point numbers are considered. The developed GA is tested on a few simulated practical Indian 24 bus system. The performance of GA is compared with conventional Linear Programming (LP) method and results are presented for illustration purpose. The correctiveness of voltage stability is measured in terms of system parameters.