Integrated method for suppressing high-capacity transformer no-load excitation inrush current

Provided is an integrated method for suppressing high-capacity transformer no-load excitation inrush current. Transformer no-load excitation inrush current is reduced by the method via multiple modes of internal suppression and external weakening of a transformer. Recording and control are started from brake-separating of the transformer in the internal part, and a transformer load and a brake-separating phase angle before brake-separating are reduced or transferred; demagnetization is performed in a bidirectional way respectively by adopting low-voltage AC and influence of residual magnetism is reduced; bias magnetic superposition is reduced via brake-closing phase angle control, and a perfect brake-closing angle is selected as far as possible; a balancing resistor and a network side conjunction brake buffer resistor are externally connected via neutral points, and measures of raising voltage from zero and network connection are adopted so as to weaken excitation inrush current; and meanwhile, negative influence of excitation inrush current is reduced via a PSS device and a quick-saturated current converter. Comprehensive transformer no-load excitation inrush current suppression is realized by the integrated realization method, and the feasible measures can be selected according to actual situations for mutual complementation.