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Abstract
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This paper presents a systematic process for designing a damping controller for pulse width
modulated series compensator (PWMSC) to improve the angular stability of a multi-machine
power system. The proposed controller is robust and tuned by satisfying the multiple H1
performance criteria to stabilize the system at multiple operating conditions. The design
problem has been converted into a constrained nonlinear optimization problem with the time
domain-based objective function which is solved by an augmented Lagrangian particle swarm
optimization (ALPSO) algorithm. The proposed control scheme has been implemented on two
nonlinear test systems. The nonlinear simulation results clearly verify that the designed con-
troller with proposed model improves the dynamic stability of the case studies, particularly
when the operating loadings changes.
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