An excitation control system for independent power generation of brushless doubly-fed motor under nonlinear load

Abstract

The invention discloses an excitation control system of independent power generation of a brushless duplex feeding motor under the non-linear load. The system comprises a CSC control unit and an LSC control unit. The CSC control unit is used for inhibiting PW voltage 5th and 7th harmonic waves so as to obtain a first PWM signal and controlling the CSC by use of the first PWM signal. The LSC control unit is used for inhibiting PW current 5th and 7th harmonic waves so as to obtain a second PWM signal and controlling the LSC by use of the second PWM signal. According to the invention, the odd number of harmonic wave voltage and current caused by the non-linear load are inhibited by improving the brushless duplex feeding motor excitation control system without adding filtering devices, so thequality of power generation voltage of the brushless duplex feeding motor is improved and normal operation of the brushless duplex feeding motor under all kinds of non-linear load working conditions of dual-quadrant frequency converters, thyristors, uncontrolled rectifiers and the like.

Description

technical field [0001] The invention belongs to the technical field of brushless doubly-fed motor control, and more specifically relates to an excitation control system for independent power generation of a brushless doubly-fed motor under nonlinear load. Background technique [0002] The brushless double-fed motor is a new type of AC induction motor, which includes two sets of stator windings with different pole pairs and a specially designed rotor for coupling the rotating magnetic field with different pole pairs on the stator side. The two sets of stator windings are respectively referred to as power windings (power winding, hereinafter referred to as PW) and control windings (control winding, hereinafter referred to as CW) according to the amount of transferred energy. Compared with traditional brushed doubly-fed induction generators, brushless doubly-fed motors eliminate brushes and slip rings and have significant applications in the fields of ship shaft power generatio...

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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides an excitation control system for independent power generation of brushless doubly-fed motors under nonlinear loads, thereby solving the problem of distortion of the output voltage of brushless doubly-fed motors caused by nonlinear loads, Technical Problems of Power Generation Voltage Quality Deterioration

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