Device and method for converting multi-phase power supply into single-phase power supply

A technology of multi-phase power supply and single-phase power supply, applied in the direction of electrical components, AC motor control, control system, etc., can solve the problem of difficulty in ensuring complete symmetry of three-phase loads, stability and overload capacity limitations, and large negative-sequence loss of electrical equipment and other problems, to achieve the effect of eliminating load asymmetry, reducing load asymmetry, and strong overload capacity

Pending Publication Date: 2021-08-20
HARBIN UNIV OF SCI & TECH +1
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to ensure the complete symmetry of the three-phase load through this method, and it may even cause serious negative sequence components in the three-phase public power system, which will affect the safe operation of the system and cause large negative sequence losses in the electrical equipment
In addition, the existing conversion of phase numbers through power electronic technology requires complex rectification and inversion processes, and in order to reduce the influence of harmonics, it is also necessary to set up related filtering devices
The basic principle of this technology is to easily introduce harmonics to the system by performing an area equivalent cut combination on the current or voltage. At the same time, this technology is based on power electronic devices, and its stability and overload capacity are limited.
Therefore, existing technologies for converting multi-phase power to single-phase power output have certain defects, resulting in low reliability of power supply

Method used

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  • Device and method for converting multi-phase power supply into single-phase power supply
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  • Device and method for converting multi-phase power supply into single-phase power supply

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Embodiment 1

[0035] see figure 1 , a device for converting a multi-phase power supply into a single-phase power supply, comprising an input winding 1 and a single-phase voltage output winding 2;

[0036] The input winding 1 is arranged on the stator 4 of the multi-phase AC motor, and is used to access the electric energy of the multi-phase power supply;

[0037] The input winding is at least a three-phase winding; the number of phases of the input winding and the multi-phase AC motor are the same as the number of phases of the multi-phase power supply; the number of phases can be three-phase, four-phase, five-phase , six phases, seven phases, eight phases, nine phases, etc.;

[0038] The input windings are uniformly and symmetrically distributed in space on the stator 4 of the motor, that is, the electrical angle of the space included angle between the windings is 360 / (number of phases) degrees. If it is a three-phase symmetrical winding, the mutual difference between the winding axes is ...

Embodiment 2

[0051] Such as Figure 5 As shown, this embodiment provides a method for converting a multi-phase power supply into a single-phase power supply, including:

[0052] Step S1: using the input winding 1 to generate a first rotating magnetic field;

[0053] Wherein, step S1 specifically includes:

[0054] The input winding 1 is connected to a multi-phase power supply, the input winding 1 and the multi-phase power supply form a loop, a multi-phase symmetrical current is generated in the input winding 1, and the first rotating field is formed according to the rotating magnetic field theory. magnetic field.

[0055] Step S2: using a single-phase voltage output winding to generate a second rotating magnetic field;

[0056] Considering that there are two methods for the single-phase voltage output winding, and different methods have different ways of generating the second rotating magnetic field, the above two methods can be selected according to actual needs, which will be explaine...

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PUM

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Abstract

The invention relates to a device and a method for converting a multi-phase power supply into a single-phase power supply. The device comprises an input winding and a single-phase voltage output winding. The input winding is arranged on a stator of a multi-phase alternating current motor; the input winding is at least a three-phase winding; the phase number of the input winding is the same as that of the multi-phase power supply; the single-phase voltage output winding comprises a stator output winding arranged on the stator and a rotor output winding arranged on the rotor; and the stator output winding is used for providing a single-phase power supply for a load under the action of a synthesized rotating magnetic field generated by the input winding and the single-phase voltage output winding when the input winding is connected to the multi-phase power supply. Therefore, according to the invention, only the input winding, the stator output winding and the rotor output winding are arranged on the alternating current motor, and the stator output winding generates the single-phase voltage by using the resultant magnetic field generated by the three windings so that the multi-phase power supply is converted into the single-phase power supply, and the reliability is high.

Description

technical field [0001] The invention relates to the technical field of phase conversion of a power supply in electromagnetic equipment, in particular to a device and method for converting a multi-phase power supply into a single-phase power supply. Background technique [0002] The power supply system of the modern power system is mainly based on the three-phase system, and the most easily available power supply system for users is the three-phase power supply or using one of the three-phase power supplies as a single-phase power supply. Therefore, the electrical equipment in the industry is mainly three-phase or single-phase electrical equipment. For example, in the fields of AC electric transmission in industry and agricultural production, the most widely used driving motors are mainly three-phase motors, while household appliances Since residential electricity is mainly based on single-phase power supply, and most of the power supply lines provided by power supply compani...

Claims

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Application Information

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IPC IPC(8): H02P25/18H02P25/02
CPCH02P25/18H02P25/02
Inventor 陶大军戈宝军
Owner HARBIN UNIV OF SCI & TECH
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