Electric locomotive auxiliary converter DC voltage oscillation suppression method

The invention relates to a converter direct-current voltage oscillation suppression method, in particular to an electric locomotive auxiliary converter direct-current voltage oscillation suppression method, and aims to solve the defects and problems in the prior art. The method is simple, good in effect and high in flexibility and applicability. The suppression method comprises the following steps1, selecting a maximum value fmax and a corresponding phase difference delta theta max from oscillation frequencies f of inverter side direct current voltage Udc and current Idc under different powerlevels; 2, collecting a direct-current voltage Udc of an inverter side in real time; 3, calculating the oscillation quantity delta U of the direct-current voltage Udc of the inverter side; 4, selecting corresponding parameters A and B, and calculating the modulation ratio compensation amount delta M; 5, calculating the compensation amount delta Mn; 6, carrying out amplitude limiting operation ondelta M or delta Mn; and 7,