High-power brushless doubly-fed motor three-level two-way frequency conversion speed regulation system

A technology of doubly-fed motor and variable frequency speed regulation, applied in control systems, control generators, vector control systems, etc., can solve the problems of complex structure, control system structure and control algorithm difficulty, etc., to achieve energy feedback, harmonic content and other problems. small effect
CN105703689BInactive Publication Date: 2019-07-02SHENYANG POLYTECHNIC UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENYANG POLYTECHNIC UNIV
Publication Date
2019-07-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a high-power brushless doubly-fed machine three-level bidirectional variable-frequency speed regulation system. The system is characterized in that the system consists of a brushless doubly-fed motor and a three-level dual-PWM alternating-current speed regulation system; and the three-level dual-PWM alternating current speed regulation system includes a brushless doubly-fed motor three-level PWM rectification unit and a brushless doubly-fed motor three-level inverter unit. According to the high-power brushless doubly-fed machine three-level bidirectional variable-frequency speed control system of the invention, in the main circuit structure of the three-level dual-PWM alternating current speed regulation system, as for each phase of bridge arm, four power devices are connected in series, and therefore, each power device bears lower voltage compared with a two-level main circuit structure; an rectification end adopts a three-level PWM rectifier, so that directional energy flow can be realized, and the recovery rate of energy can be improved, and the energy loss of the motor alternating-current speed regulation system can be decreased. The high-power brushless doubly-fed machine three-level bidirectional variable-frequency speed regulation system is suitable for high-voltage high-power motor driving application.
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Description

technical field

[0001] The invention relates to a frequency conversion speed regulation system of a brushless double-fed motor, in particular to a three-level bidirectional frequency conversion speed regulation system of a high-power brushless double-fed motor, which belongs to the field of automatic control and numerical control. Background technique

[0002] Brushless doubly-fed motor (abbreviated as BDFM) is a new type of AC induction motor. Structurally, the stator end has two sets of independent three-phase stator windings with different numbers of pole pairs, which are called power windings and control windings respectively. Powered by grid and variable frequency power supply respectively. The two sets of stator windings share a set of iron cores and there is no direct electromagnetic coupling. This kind of motor eliminates brushes and slip rings in structure, and has the advantages of simple structure, sturdy and durable, and adjustable power factor. The motor has ...

Claims

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