Fuzzy logic control for HVDC transmission

The conventional proportional-integral type control system loops for the current and extinction angle controllers in HVDC power converters are replaced with fuzzy logic based controls. The two approaches are compared using simulations on an electromagnetic transients simulation program. A method to refine the fuzzy logic formulation further to improve the transient response is presented. The results show that the fuzzy logic based approach can provide, at a minimum, a marginal improvement over PI-based controllers.