Converter valve commutation failure distinguishing method

• Main Authors: LIU ZEHONG, TANG GUANGFU, YANG YUEXI
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2014
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to a converter valve distinguishing method, in particular to a converter valve commutation failure distinguishing method. The converter valve commutation failure distinguishing method comprises the steps that firstly, the operation states of a thyristor inside a converter valve are measured, minimum turn-off angles gammas needed in the turn-off process of the thyristor are determined, then the minimum turn-off angle gamma of each thyristor level is compared with a system turn-off angle gamma, the number of commutation failures of series-connection thyristor levels inside the same bridge arm is counted, and whether commutation failures occur to the bridge arm or not is analyzed comprehensively, wherein the operations states comprise the thyristor junction temperature Tj, the current descent rate di/dt, the back pressure borne in the turn-off process Vrr, the on state current IF and the like. According to the converter valve distinguishing method, actual criteria of the commutation failure