Four-phase electrical excitation doubly salient motor converter fault-tolerant topological structure and fault-tolerant method

Abstract

The invention discloses a topological structure for driving a fault-tolerant power converter of a four-phase electrical excitation doubly salient motor and a fault-tolerant control method. In the topological structure, A and C phase windings with 180 degrees phase differences are connected in series in an opposite way, and B and D phase windings are in the same way; two bidirectional thyristors are added on the base of a four-phase full bridge converter in the prior art; a bidirectional thyristors TR1 is connected between the input ends of the A and B phase windings, and a TR2 is connected between the input ends of the C and D phase windings. When the driving system is running normally, the thyristors TR1 and TR2 are turned off, the control mode adopts four-phase four-state control, trapezoidal wave current with 90 degrees phase difference is put into motor four phase windings in sequence, and the motor four phase windings contribute externally; when single-phase open circuit fault of the converter is detected, the fault-tolerant control method is adopted, the converter is in a fault-tolerant operating state and can output trapezoidal wave current with 90 degrees phase difference to phases of the motor, and the motor has four phase windings to contribute externally and cannot be influenced by a power tube open circuit.

Description

technical field [0001] The invention relates to the field of research on the reliability of motor drive systems, in particular to a fault-tolerant topology structure for single-phase open-circuit faults of four-phase electric excitation double salient pole motor converters. Background technique [0002] The electric excitation double salient pole motor has the advantages of simple structure and flexible control, and the adjustable excitation current makes it possible to operate in four quadrants. Due to the independent control of each phase, the electric excitation double salient pole motor has certain fault-tolerant performance; the existing three-phase When a single-phase open-circuit fault occurs in the converter of an electrically excited double-salient pole motor, the remaining two phases run, resulting in excessive output torque fluctuations, which may cause the motor to fail to run in severe cases. Multi-phase electric excitation doubly salient motors have higher redu...

AI Technical Summary

Problems solved by technology

[0003] In terms of body design, the patent application No. 201310079451.4 provides a four-phase double-salient pole brushless DC motor with symmetrical inductance of each phase, and discloses a winding method using one excitation winding to chain three armature windings to realize the inductance of each phase. A new type of symmetrical four-phase electric excitation doubly salient motor, the opposite electric potential amplitude of the motor is equal, and there is a four-phase winding output force at any time, the redundant fault tolerance performance of the motor body is good, but no fault tolerance control method is involved; fault detection On the one hand, the patent application No. 201510013255.6 discloses a method for open-circuit fault diagnosis of a four-phase electric excitation doubly salient pole motor, which is implemented by connecting a detection resistor between the midpoints of the two channels, but does not give specific details for realizing fault-tolerant operation. Topology and scheme; Fault-tolerant strategy, "Four-phase electric excitation double-salient pole motor single-phase open circuit fault analysis and fault-tolerant control strategy" published in "Acta Electrical Engineering" January 2016 aimed at four-phase 8 / 6-pole electric excitation double convex pole motor, the winding current and output torque under the single-phase open-circuit fault of the motor winding are analyzed, and a fault-tolerant control strategy is given. The 8 / 6-pole electric excitation double salient pole motor studied in this paper belongs to the existence of inductance maintained at zero mode, it is not possible to realize that the thinking and winding are all output to the outside at any time

Images