Railway power system interconnection device with dual-network ice melting function and control method

Abstract

The invention relates to a railway power system interconnection device with a dual-network ice melting function and a control method. The interconnection device comprises a low-impedance multi-winding transformer, a plurality of power units, a high-voltage filter and a low-impedance output transformer, the high-voltage side of the low-impedance multi-winding transformer is connected with an electrified railway contact network and a return line, and a plurality of low-voltage side windings of the low-impedance multi-winding transformer are connected with the rectification sides of the plurality of power units one by one; and the output side of a three-phase three-wire cascade inverter formed by the inversion sides of the plurality of power units is connected with a high-voltage filter and then is connected with a low-impedance output transformer. The control method of the interconnection device comprises the steps of railway traction power supply system ice melting control, railway power supply and distribution system ice melting control and interconnection operation control. Therefore, ice on wires of a railway traction contact net and a railway power supply and distribution network can be melted, railway traction 27.5 kV can be converted into 10 kV to supply power to the railway power supply and distribution network, and the advantages that the topology of interconnection device is not changed, and multiple functions of the interconnection device can be achieved only by changing the control method are achieved.

Description

Technical field [0001] The present invention belongs to the technical field of electrified railway, and more particularly to a railway power system interconnection equipment and a control method having dual-mean ice function. Background technique [0002] Railway power systems include rail traction power supply systems and rail power supply power distribution systems. The railway traction power system is 27.5kV power supply, and the railway power supply power distribution system is 10KV system. Applicants have found that there are often two important issues in the railway power system: the first is to lack in the northwest, 10kV power supply, surrounding public grid construction projects, resulting in electrical power supply and power distribution system powerless or low amount of power supply Power supply reliability; second, there is a high cold, high humidity problem in some areas, and the winter is easy to suffer from overhead wires. [0003] If an inventive can be invented t...

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Problems solved by technology

The applicant found that there are often two important problems in the railway power system: first, in the northwest region of my country, 10kV power supply is scarce, and there is no public grid construction project around, resulting in no power available or insufficient power supply in the railway power supply and distribution system. Power supply reliability; the second is that there are high cold and high humidity problems in some areas, and it is very easy to suffer from icing on overhead wires in winter

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