Research on 750 kV Bus Short Circuit Current and New Exploration of Suppression Methods
The conventional control measures for 750/330 kV short-circuit current include hot standby units,hot standby lines,electromagnetic ring network decoupling,etc.However,with the rapid growth of load and clean energy in Qinghai power grid in recent years,the connection of power grid structure is becoming increasingly tight,and the existing 750 kV busbar switch breaking capacity and conventional suppression measures are gradually unable to meet operational needs.Therefore,it is urgent to carry out research on new technologies for suppressing short-circuit current.Study the theoretical calculation method for short-circuit current of 750 kV busbar,and propose practical short-circuit current suppression methods and guidance suggestions for the maximum number of outgoing lines for its branch short-circuit current;Propose a method based on fast switching to suppress short-circuit current,replacing the branch line side switch that contributes the most to short-circuit current with a fast switch.Within 20 ms after a fault,disconnect the side switch to achieve fast series operation,ensuring full line operation before the fault without sacrificing system reliability to control system short-circuit current.This lays the foundation for the engineering application of fast switches in 750 kV voltage level power grids.
750 kVshort circuit current controlquick switchrunning in seriescurrent limiting reactor
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