Fault switching system and method for valve control system protection device of flexible direct-current converter valve
A technology of protection device and valve control system, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as unhealthy valve control system, avoid malfunction of valve control system, avoid frequent switching of board failures, and ensure safe operation. Effect
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[0033] A fault switching system for the protection device of a flexible DC converter valve valve control system, which includes two sets of redundant flexible direct converter valve control systems, each of which includes a set of independent flexible direct converter valve control systems Valve "three out of two" protection device, each set of flexible straight converter valve "three out of two" protection device is equipped with three protection boards and an outlet board, the outlet board is used to output the protection action signal, three out of two protection System configuration such as figure 1 As shown, in order to ensure the reliable detection of the current of the flex-straight converter valve (6 bridge arms) by the valve control protection system, each bridge arm divides the bridge arm current into 3 channels and simultaneously connects it to the “three out of two” protection system. Among the three protection boards, when at least 2 currents of each bridge arm reac...
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