Brushless doubly-fed independent power generation device and system

Abstract

A brushless doubly-fed independent power generation device is characterized by comprising a brushless doubly-fed motor, a synchronous motor and a rectification inversion module, wherein the brushlessdoubly-fed motor comprises a control winding, a power winding and a rotor winding, rotates under driving of external power and simultaneously drives the synchronous motor coaxially connected with thebrushless doubly-fed motor to rotate, the synchronous motor is used for outputting a three-phase AC current, the rectification inversion module is used for performing rectification and inversion on the three-phase AC current to obtain an inversion current, outputting the inversion current to the control winding of the brushless doubly-fed motor and providing excitation for the control winding so as to drive the brushless doubly-fed motor to run, and the power winding of the brushless doubly-fed motor is used for driving an external load to run. In the brushless doubly-fed independent power generation device, an excitation current is not needed to be provided by a power grid during the power generation process, a power factor of the power grid cannot be affected, and meanwhile, the harmonicpollution of the power grid can be effectively reduced. Moreover, the invention also provides a brushless doubly-fed independent power generation system.

Description

technical field [0001] The invention relates to the field of electric transmission and control, in particular to a brushless double-fed independent power generation device, system and starting method. Background technique [0002] BDFM (Brushless Doubly Fed Machine, brushless double-fed machine) is a new type of motor developed in recent years. It eliminates brushes and collector rings, realizes brushless rotors, and makes the rotor structure simpler and more durable. Other aspects retain the advantages of the slip power conversion system. The two stator windings of the BDFM are completely isolated. For high-voltage motors, they can be controlled by low-voltage frequency converters, which greatly saves costs. In addition, the capacity of the BDFM converter can be reduced to 1 / 3 of the total power of the motor, with high reliability and efficiency up to 96%. It can realize variable speed constant frequency, active and reactive power decoupling control, and output inductive o...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a brushless double-fed independent power generation device, system and starting method for the problem of low start-up efficiency of the brushless double-fed independent power generation system in the absence of a large-scale power grid

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