Three-phase to single-phase power supply and transformation device based on adjustable reactors

Abstract

The invention discloses a three-phase to single-phase power supply and transformation wiring device based on adjustable reactors. The device comprises a voltage balancer and a compensation circuit, afirst primary side winding, a first secondary side winding and a second secondary side winding of the balance transformer form an A-phase coil, a second primary side winding and a third secondary sidewinding form a B-phase coil, and a third primary side winding, a fourth secondary side winding and a fifth secondary side winding form a C-phase coil; the head ends of the first secondary winding andthe fourth secondary winding are connected with the first adjustable reactor in parallel; terminals of the second secondary winding, the third secondary winding and the fifth secondary winding are connected end to end; the head end and the tail end of the third secondary winding are used as output ends for connecting a traction load; the head end of the first secondary winding is connected with the tail end of the third secondary winding, and the head ends of the fourth secondary winding and the third secondary winding are connected with the second adjustable reactor in parallel. According tothe invention, the adjustable reactors are adopted to realize negative sequence and reactive comprehensive treatment, and the national standard requirement of electric energy quality is met; operation is simple, control is easy to achieve, and the method can be widely applied to the alternating-current electrified railway field.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a three-phase to single-phase power supply and transformation wiring device based on an adjustable reactor. Background technique [0002] The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that single-phase power frequency AC power is generally used to power railway locomotives in electrified railways. However, in the bullet train station, especially in the bullet train station of the short-distance urban railway, the power supply scheme has the following problems: [0003] At present, the power supply scheme of the bullet train depot adopts a separate power supply from the traction substation or a new 110kV traction substation. Due to the large short-circuit capacity of the external power supply system, the negative sequence generated by the single-phase tra...

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Problems solved by technology

[0005] Aiming at at least one defect or improvement requirement of the prior art, the present invention provides a three-phase to single-phase power supply and transformation wiring device based on an adjustable reactor, the purpose of which is to solve the problem of using 10kV or 35kV as the incoming power supply for the EMU depot. The single-phase traction load in the power supply scheme is likely to cause three-phase imbalance and affect the power quality of the grid

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