Browsing by Author "CHIHEB Sofiane"

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    Enhancement of the HVDC LCC system protection by using an integrated DC/DC converter
    (ELEKTROTEHNISKI VESTNIK, 2023) CHIHEB Sofiane
    The paper investigates the response of the High-voltage Direct Current (HVDC) CIGRE Benchmark when exposed to overvoltages, voltage drops, or missed pulses in power converters. The impact of operation of integrated DC/DC converters is evaluated. A system using MATLAB/Simulink is simulated at faulty states to evaluate the HVDC link behaviour and reestablish the HVDC link after fault removal. A commutation failure in the HVDC system occurs when the AC voltage perturbation above than 10 %, at which the coil voltage significantly increased and interrupts the current in thyristors. To solve the problem, a DC/DC converter of the Buck configuration is integrated into the DC filters. The converter pulse is controled using the PWM technique where the pulse width is adjusted to maintain the DC voltage within the set of limits. Using the DC/DC converter, the commutation failure is eliminated upon fault disappearance. Moreover, there is no need for communication between the HVDC poles and the protection against faults in the HVDC system is ensured