Alternating-current side short-circuit current suppression method and system for hybrid direct-current flexible direct-current converter valve
A short-circuit current, AC system technology, applied in power transmission AC network, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. problem, to avoid the system short-circuit current exceeding the standard and reduce the short-circuit current level
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[0068] like figure 2 As shown in the figure, the sending end of the hybrid cascaded UHV DC transmission system adopts conventional UHV DC topology, and each pole is composed of two twelve-pulse conventional DC converters in cascade; The poles are all composed of twelve-pulse conventional DC converters at the high-voltage end (ie, 800kV~400kV) and multiple low-voltage ends (400kV~neutral line) ( figure 2 3) parallel flexible DC converters are cascaded. The flexible DC converter adopts a half-bridge modular multi-level converter, the receiving end conventional DC converter and each flexible DC converter The current transformers are fed into different AC busbars.
[0069] like image 3 As shown, in order to realize the suppression of the short-circuit current of the flexible DC feeding system of the hybrid cascaded UHV DC system, the two-stage current limiting method of total current current limiting + reactive current low-voltage current limiting adopted in the present inven...
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