Theoretical Analysis on the Commutation Failure Criterion of Thyristor
Long GUO , Ying HUANG , Yan LI , Xiaobin ZHAO , Qingming XIN , Yuxin LU , Zu’an ZHANG , Lingfei LI , Ting HOU , Chunhua LI , Yuke JI
›› 2018, Vol. 12 ›› Issue (5) : 1 -9.
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Theoretical Analysis on the Commutation Failure Criterion of Thyristor
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Abstract
The whole process of conventional DC thyristor valve commutation is analyzed comprehensively, including the commutation overlapping process during the forward conduction current being zero, and the recovery process of the reverse blocking ability. Especially, the thyristor’s commutation overlapping process is reinterpreted in terms of commutation reactance energy dissipation, and the thyristor’s recovery process of the reverse blocking ability is analyzed in terms of power charge. On the basis of these, the influence of the reverse recovery power charge, carrier lifetime and reverse turn-off time of the thyristor valve on the commutation process are studied. Finally, the theoretical basis of commutation failure criterion ‘γ<7°’ is analyzed and deduced.
Keywords
thyristor / commutation failure criterion / commutation reactance / recovery process of reverse blocking
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