Circuit capable of reducing current conversion valve commutation failure
A commutation failure and commutation valve technology, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of reducing the economy of HVDC transmission systems and failing to eliminate commutation failures , increase system reactive power consumption and other issues, achieve the effect of small transformation cost, simple design, and reduce the occurrence of commutation failure
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0027] The main principles are as follows:
[0028] Firstly, the mechanism of commutation failure is introduced, such as figure 1 Shown is the wiring diagram of the six-pulse converter valve on the inverter side, I d is the direct current, L d It is a smoothing reactor, take V6 and V5 conduction, and commutation from V5 to V1 as an example, explain the mechanism of commutation failure, the schematic diagram is as follows figure 2 As shown, where μ is the commutation overlap angle, β is the leading firing angle, and γ is the arc extinguishing angle.
[0029] In the process of commutating from V5 to V1, the two ends of V1 are e a with e c , withstand positive pressure e ac . To achieve commutation from V5 to V1, e must be satisfied c a , so the commutation must be at the natural commutation point c 0 completed before. Since V5 needs a carrier r...
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