Abstract
In this paper, an improved load frequency control operation in a nonlinear interconnected two-area non-reheated thermal power system is investigated. The nonlinearity in interconnected power system is primarily originated in the form of generation rate constraint and governor dead band (GDB). Out of these, GDB is the one due to which sustained oscillations may be observed in frequency of generated power. In order to mitigate these oscillations and to further provide robustness in control structure, a nested control structure (NCS), based on simple PID controllers, is proposed. Two different variants of NCS and a conventional PID controller are considered for the thorough comparative analysis in this paper. Further, the parameters of NCS and conventional feedback PID controller have been optimized with the help of a recently proposed bio-inspired salp swarm algorithm and its performance compared with particle swarm optimization(PSO). Extensive simulation studies presented in the paper establish that Salp swarm algorithm (SSA) optimized NCS provide significant improvement in dynamic performance of the system even under parametric variations with removal of sustained oscillations.
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