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

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...

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

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