Anovel Protection Method Of Direct Currrent Converter Valve Thyristor In Discontinuous Current Mode

摘要

The present provided a novel protection method of direct current converter valve thyristor in discontinuous current mode. In normal operation, the thyristor of converter valve will be triggered normally when thyristor anode and cathode voltage is positive, and thyristor electronics (TE) send pulse. If the discontinuous current happens, the current will over zero and the thyristor will cut off. After that if the forward voltage appears again, the voltage will be too great, more than the thyristor voltage capability. If the thyristor is not triggered immediately, the thyristor will be damaged probably. To ensure converter valve work normally in discontinuous current mode of the direct current transmission system, TE design has automatic re-trigger function to protect thyristor in discontinuous current mode; in triggering interval when forward voltage is up to +100V the thyristor will be re-triggered to ensure thyristor and system work safely and reliably.