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The reverse recovery characteristics of high power thyristor are important device physical properties influencing the reliable operation of HVDC thyristor valve. In this paper, the reverse recovery characteristics of high power thyristor are investigated from the aspects of both external circuit and internal device physics. By analyzing the depletion of carrier during the reverse recovery of thyristors,...
The reverse recovery characteristics of the high power thyristor becomes increasing important to the converter valve designers as commutation failure often occurs in its reverse recovery process. Therefore, the recovery protection of converter valve is provided by thyristor control unit. The design of thyristor control unit is associated with the relationship between reverse recovery characteristics...
The converter valve is the core equipment in the HVDC transmission power system and the thyristor level is the basic unit of HVDC converter valve, its performance has a direct effect on the reliability, stability and efficiency of the whole power system. Thus, each thyristor level in the converter valve needs to be test routinely during the maintenance period of the electric equipment in order to...
The high power thyristor is the basic unit in HVDC converter valve, and its transient performance has a tremendous influence on the reliability, stability of the whole power system and designs of thyristor control unit. For this reason, each thyristor needs to be tested routinely before the operation of the power system. However, there is no specification for the routine test of thyristor valve. The...
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