Double-three-phase PMSG multi-phase open-circuit fault-tolerant operation control method and system

Abstract

The invention discloses a dual-three-phase PMSG multi-phase open-circuit fault tolerant operation control method and system. The method and the system adopt a double-layer current control loop to control the current and the rotational speed of each phase of the dual-three-phase PMSG, wherein the inner layer current control loop is used for controlling the direct-axis voltage and the time-varying part of the quadrature-axis voltage, and the outer layer current control loop is used for controlling the direct-axis voltage and the non-time-varying part of the quadrature-axis voltage. Compared withthe asymmetric control method of the prior art, the double-layer current control loop control mode adopted by the invention has simple structure and flexible use, and can realize more complete decoupling of the direct-axis current and the quadrature-axis current of the double-three-phase PMSG under the asymmetric state operation, and better effect of restraining the fluctuation of the torque andthe rotational speed. In addition, the control structure in the double-layer current control loop adopted by the invention can be realized by using a common PI controller, the structure is simple, thecost is low, and the calculation amount is not obviously increased.

Description

technical field [0001] The invention relates to the technical field of automation control, in particular to a method and system for controlling a multi-phase open-circuit fault fault-tolerant operation of a double-three-phase permanent magnet synchronous generator PMSG. Background technique [0002] Compared with the traditional three-phase permanent magnetic synchronous generator (PMSG), multi-phase PMSG has gradually attracted attention due to its advantages of high redundancy, strong fault tolerance, and large single-unit capacity. Multi-phase PMSG can meet the same voltage and current conditions, and double the power generation compared with traditional three-phase motors. Among them, the multi-phase open-circuit fault-tolerant operation of the double-three-phase permanent magnet synchronous generator, because the space position of the stator winding is similar to the multi-phase open-circuit fault-tolerant operation of the traditional double-three-phase permanent magnet...

AI Technical Summary

Problems solved by technology

However, since these methods are inherited from the method of controlling the normal operation of the motor, they often cannot solve the decoupling problem of the voltage and current of the motor under the asymmetrical operation state.

In order to solve the problem of decoupling the voltage and current of the motor under the asymmetrical operation state of the dual three-phase permanent magnet synchronous generator, although some related researches put forward the concept of time-varying rotation control, the time-varying control of the motor voltage and current generated by decoupling the motor under the asymmetric state The variable rotation matrix is ​​eliminated, but it cannot be completely decoupled, and while eliminating the large fluctuations of the direct axis, quadrature axis current and the electromagnetic torque of the motor, new small fluctuations are generated.

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