Stabilization of a High Voltage ACDC Power System II. Multimachine System Subjected to Large Perturbation

This article presents a stabilizing control strategy for a multimachine ACDC power system under large perturbation conditions. The controller is designed with local variables. The dynamics of the AC and DC systems are presented and a solution technique based on diakoptical methods is discussed. The response recorded for a multimachine system with a DC link shows that a sub-optimal proportional control of excitation voltage and firing angle of the converters provide an effective control of transients.