A linear phase-shifting transformer with ring winding, its control method and its application

Abstract

The invention belongs to the technical field of transformers, and discloses a linear phase-shifting transformer with a ring winding, a control method and an application thereof. The primary and secondary sides adopt a symmetrical structure and are fixed; the winding on the iron core adopts a ring winding; After the internal connection, lead out the other winding terminal and connect it to the terminal block. After the terminal block is fixed on the junction box, the junction box is fixed outside the transformer protective cover. When the invention is applied to rectification, after the three-phase alternating current is connected to the primary side, a traveling wave magnetic field is formed in the air gap, and an induced potential is generated on the secondary side. Since the number of turns of the windings on the same side is the same and distributed on a straight line, it has a better phase shifting function Theoretically, phase shifting at any angle can be realized according to requirements; when the present invention is applied to inverter, the primary side is connected to the 3×n phase pulse wave output by the three-phase bridge inverter system, and the secondary side outputs three-phase alternating current. The invention has simple wire embedding, reduces end leakage reactance, greatly simplifies the structure of the phase-shifting transformer, and is easy to be modularized.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a linear phase-shifting transformer with ring windings, a control method and an application thereof. Background technique [0002] At present, in the power system, the public grid provides electric energy with a fixed frequency and voltage, but various electrical equipment have different requirements for the power supply. After a reasonable transformation of the electric energy provided by the grid, it will be used by the load, which will make the load Work in the best condition to achieve better economic benefits. The function of power conversion is to transform the electric energy provided by the grid into a power supply that meets the requirements of various electrical equipment. At the same time, the proportion of the amount of electricity used after power conversion to the total power generation has become an important factor to measure the country's econom...

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Problems solved by technology

The isolation transformer can effectively realize electrical isolation and has high reliability, but the energy transfer of the primary and secondary sides is completely realized through magnetic coupling, resulting in a large equivalent capacity and a large transformer volume

[0007] The commonly used auto-type phase-shifting transformers are T-shaped, star-shaped, polygonal and zig-zag windings. The efficiency and manufacturing process of the transformer are improved compared with the isolated phase-shifting transformer. The disadvantage is that it cannot achieve electrical isolation.

When the power is large or the number of phases is large, the volume and weight of the transformer will increase dramatically, the utilization rate of the iron core will be low, and the winding structure will be very complicated, resulting in difficult processing

[0012] (2) The structure of the existing circular phase-shifting transformer is complicated, and the manufacturing of the iron core and the winding of the coil winding are relatively complicated. At the same time, the circular phase-shifting transformer is not easy to expand, and the air gap magnetic field is difficult to control

[0013] (3) The existing linear transformer is a long-short-pitch linear phase-shifting transformer. The primary and secondary sides are symmetrical structures, and the primary and secondary sides use double-layer stacked windings. This type of structure is difficult to insert wires, the number of turns is limited, and the end leakage reactance bigger

[0015] The above-mentioned defects of the existing four phase-shifting transformers are all determined by the structural properties, and the corresponding defects cannot be fundamentally solved

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