Multipurpose large-power controllable power source

The utility model discloses a multipurpose large-power controllable power source which comprises a circuit interrupter, multi-winding transformers and variable flow unit modules, wherein the number of the variable flow unit modules is the same as that of the multi-winding transformers. The circuit interrupter is formed by the parallel connection between a circuit interrupter with a current-limiting resistor and a common circuit interrupter without the current-limiting resistor; the primary sides of the multi-winding transformers are connected with one another by means of star, and the auxiliary sides thereof are connected with one another by means of triangle; and the variable flow unit modules are connected with the auxiliary sides winding of the multi-winding transformers in series. Each variable flow unit module comprises a filter capacitor, a filter reactor, a three-phase bridge which is formed by an IGBT module, a resistor and a DC capacitor, wherein the resistor and the DC capacitor are connected with the output end of the three-phase bridge in parallel. On the premise that a main topology structure is not changed, by jointly using a single device or a plurality of devices, the multipurpose large-power controllable power source can be used for the DC melting ice of an electricity-transmitting wire, the light DC electricity transmission and the dynamic reactive compensation, and improves the use flexibly of equipment, the cost performance and the maintainability of the equipment simultaneously.