New Coordinated Design of PSSs and SVC to Improve Power System Stability via BSO

Abstract

In this paper, the design and assessment of new
coordination between Power System Stabilizers (PSSs) and
Static Var Compensator (SVC) in a multimachine power
system via statistical method is proposed. The coordinated
design problem of PSSs and SVC over a wide range of
loading conditions is handled as an optimization problem.
The Bacterial Swarming Optimization (BSO), which
synergistically couples the Bacterial Foraging (BF) with
the Particle Swarm Optimization (PSO), is employed to
seek for optimal controllers parameters. By minimizing
the proposed objective function, in which the speed
deviations between generators are involved; stability
performance of the system is enhanced. To compare the
capability of PSS and SVC, both are designed
independently, and then in a coordinated manner.
Simultaneous tuning of the BSO based coordinated
controller gives robust damping performance over wide
range of operating conditions and large disturbance in
compare to optimized PSS controller based on BSO
(BSOPSS) and optimized SVC controller based on BSO
(BSOSVC). Moreover, a statistical T test is executed to
validate the robustness of coordinated controller versus
uncoordinated one.