Brushless doubly-fed motor excitation control system and control method using same

Abstract

The invention relates to a brushless doubly-fed motor excitation control system, which is characterized by comprising a PWM (Pulse-Width Modulation) rectifying unit, a first current sensor, a smoothing reactor, a contactor, an excitation controller and an inverter unit, an operation and display unit, an energy storage device, a BOOST reactor, a soft start circuit, a first voltage detection circuit and a second voltage detection circuit. The brushless doubly-fed motor excitation control system can always keep a speed-variable load-variable constant-frequency and constant-voltage power generation state when a brushless doubly-fed motor is at an electric operating state, the rotating speed of a brushless rotor rapidly changes and the load condition is within a larger range; and when the brushless doubly-fed motor is at the electric operating state, the brushless doubly-fed motor excitation control system can finish rapid adjustment of the rotating speed of the brushless rotor by excitation control and realizes multiple electric operating modes, such as synchronous operating, asynchronous operating and doubly-fed speed adjustment. When the load condition changes in a larger range, the brushless doubly-fed motor excitation control system can always keep the hard mechanical property of a synchronous motor. The invention also comprises the control method using the brushless doubly-fed motor excitation control system.

Description

technical field [0001] The invention relates to an automatic motor control system and a control method, in particular to an excitation control system and a control method for a brushless double-fed motor. Background technique [0002] At present, the research on the design of brushless double-fed motor and its control system has been carried out for decades, but some key problems in the application have not been solved, such as the complex model of the brushless double-fed motor system, and there is no ready-made control algorithm and control system topology. , the existing control system cannot respond quickly to the sudden increase and decrease of the load and the change of the brushless rotor speed during the normal operation of the brushless doubly-fed motor. It has the characteristics of high operating efficiency, energy saving, good stability and high reliability. Manual intervention is required, not a closed-loop control system in the true sense. [0003] The existi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a brushless double-fed motor excitation control system to solve the technical problems of complex excitation control structure, single function and poor adaptability of brushless double-fed motor

[0005] Another object of the present invention is to provide a method for controlling the excitation of a brushless doubly-fed motor by utilizing the excitation control system of a brushless doubly-fed motor, so as to solve the technical problems of cumbersome control process and poor control accuracy of the brushless doubly-fed motor

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