FUZZY-LOGIC CONTROL FOR HVDC TRANSMISSION

The conventional proportional-integral type control system loops for t he current and extinction angle controllers in high voltage de convert ers are replaced with fuzzy logic based controls. The two approaches a re compared using simulations on an electromagnetic transients simulat ion program. A method to further refine the fuzzy logic formulation to improve the transient response is presented. The results show that th e fuzzy logic based approach can provide, at the minimum, a marginal i mprovement over the P-I based controller.