Control Method of Running State of Brushless Doubly-fed Motor

Abstract

The invention discloses a running state control method of a brushless double-fed motor. The running state control method comprises the steps of making a control system powdered on, completing self-detection of the system, and entering a standby state; and judging a target control state of the brushless double-fed motor and controlling the brushless double-fed motor to work in the target control state by the control system according to a starting-up command which is received in real time and running state of a part under the standby state and according to a judgment rule. A special structure and control requirement of the brushless double-fed motor are combined, a corresponding action is executed on each switch according to switching of different states and according to a principle of a state mechanism, so that the original complicated switching logic control process becomes simple and high-efficiency; state and fault classification of the motor is used as a switching condition, the scientific reasonableness of system action is ensured, and the running safety is also effectively guaranteed; and moreover, when a controller fault occurs in the system, the motor is maintained in an asynchronous running state by state switching, so that uninterruptible running of site operation is ensured, and the running state control method has important significance.

Description

technical field [0001] The invention specifically relates to a method for controlling the running state of a brushless doubly-fed motor. Background technique [0002] The brushless double-fed motor has a special structure, which is different from ordinary motors. There are two sets of stator windings at the stator end. Designed as low voltage, the low voltage winding is connected to the low voltage power grid through the controller, and the speed regulation of the motor can be realized by using the controller. Compared with ordinary AC motors, this motor has no carbon brushes and commutators, and can realize high-power high-voltage motors controlled by small-capacity low-voltage controllers. Therefore, this motor has broad application prospects in the fields of wind power, hydropower, and variable frequency drives for fans and pumps. [0003] However, due to the special structure of the brushless double-fed motor, its control system structure and control method are also ver...

AI Technical Summary

Problems solved by technology

The current control methods for brushless doubly-fed motors focus on the control of the speed or torque of the brushless doubly-fed motor itself, but often ignore the system safety, so the existing control methods often lead to abnormal timing or sequence of switching operations , causing security problems in the control system

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