Redundancy four-quadrant brushless double-fed motor speed regulation system allowing smooth handoff

Abstract

The invention provides a redundancy four-quadrant brushless double-fed motor speed regulation system allowing smooth handoff. The system comprises a brushless double-fed motor connected with an alternating current grid, a mechanical load, a pulse width modulation (PWM) converter device of a double-table back-to-back type structure, a converter controller of the converter device, a double-sleeve current detection module, a direct current voltage detection module and a grid voltage detection module and further comprises a main controller man-machine interaction interface. The mechanical load, the PWM converter device and the converter controller are connected with a rotating shaft of the brushless double-fed motor. The system has the advantage that a converter current distribution scheme can be transmitted by the main controller man-machine interaction interface through a communication port and can also be achieved through converters through compromise settlement to form the back-to-back type PWM converter device of the redundancy structure dynamically in real time. Given current values of the converters in the device can be dynamically distributed according to the working state, the fault condition and the overhauling requirement of the converters, and smooth handoff and high reliability operation between different operation states are achieved.

Description

technical field [0001] The invention relates to a brushless double-fed motor speed control system, in particular to a redundant four-quadrant brushless double-fed motor speed control system capable of smooth switching. Background technique [0002] The brushless double-fed motor has the advantages of flexible speed regulation, four-quadrant operation and low power converter capacity, and there is no maintenance problem of brushes and slip rings, so it has broad application prospects. The brushless double-fed motor speed control system is developing in the direction of medium and high voltage and large capacity. Once a sudden shutdown occurs, it will cause huge economic losses. At present, the weakest point of the brushless double-fed motor speed control system is the reliability of the back-to-back PWM converter. Once a power device in the converter fails, the system will inevitably shut down suddenly, and it is difficult to achieve speed control. High reliability operation...

AI Technical Summary

Problems solved by technology

The brushless doubly-fed motor speed control system is developing in the direction of medium and high voltage and large capacity. Once a sudden shutdown occurs, it will cause huge economic losses

At present, the weakest point of the brushless double-fed motor speed control system is the reliability of the back-to-back PWM converter. Once a power device in the converter fails, the system will inevitably shut down suddenly, and it is difficult to achieve speed control. High reliability operation of the system

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