CN-122001277-A - Current reconstruction compensation-based switch reluctance motor turn-to-turn short circuit fault tolerance control method

CN122001277ACN 122001277 ACN122001277 ACN 122001277ACN-122001277-A

Abstract

The invention belongs to the field of motor control, and discloses a switched reluctance motor turn-to-turn short circuit fault tolerance control method based on current reconstruction compensation. Firstly detecting turn-to-turn short circuit faults, judging a conduction interval where a motor is located according to the position of a rotor, reconstructing expected currents of each phase after the faults, comparing the reconstructed expected currents with actual currents to generate fault-tolerant control signals, and jointly deciding with output signals of a conventional control module to generate final control signals to drive a power converter. The invention abandons the traditional fault phase isolation strategy, performs fault-tolerant control in a software mode, does not need additional hardware transformation, and takes account of real-time performance and economy. Simulation results show that the fault-tolerant algorithm can reduce phase current amplitude and torque pulsation, and a reliable solution is provided for the inter-turn short circuit fault-tolerant control of the switched reluctance motor.

Inventors

GE LEFEI
LI HONGBING
LI SHIJUN
SONG JIAHE
SUN JIAYU

Assignees

西北工业大学

Dates

Publication Date: 20260508
Application Date: 20260325

Claims (6)

1. The fault-tolerant control method for the turn-to-turn short circuit fault of the switched reluctance motor based on current reconstruction compensation is characterized by comprising the following steps of: Step 1, judging whether an inter-turn short circuit fault occurs according to the acquired phase current and rotor position of the three-phase switch reluctance motor, if the inter-turn short circuit fault does not occur, jumping to step 6, and if the inter-turn short circuit fault occurs, operating step 2; step 2, judging a conduction interval according to the rotor position of the three-phase switch reluctance motor; Step 3, generating a phase expected current according to a phase expected current reconstruction function; step 4, outputting a control signal S according to a comparison result of the expected current and the actual current; step 5, a control signal S F determined by the control signal S output by the fault-tolerant controller and the control signal S act output by the control module; And 6, inputting a final control signal S F-act into a power converter of the three-phase switch reluctance motor to control the on and off of a corresponding switch tube.
2. The fault-tolerant control method for the turn-to-turn short circuit fault of the switched reluctance motor based on current reconstruction compensation according to claim 1, wherein the specific implementation process of the step 2 is as follows: Aiming at a three-phase switch reluctance motor, the division rule of the conduction interval is as follows: When theta is [ theta on ,θ off ], the phase-A conduction interval is located, when theta is [ theta on +15 ° ,θ off +15 ° ], the phase-B conduction interval is located, and when theta is [ theta on +30 ° ,θ off +30 ° ], the phase-C conduction interval is located; Wherein, θ on and θ off represent an on angle and an off angle, respectively, and θ represents a rotor position.
3. The fault-tolerant control method for the turn-to-turn short circuit fault of the switched reluctance motor based on current reconstruction compensation according to claim 2, wherein the specific implementation process of the step 3 is as follows: The desired current reconstruction function expression for each phase is: Wherein, the In order to achieve a desired current flow, For the phase standard current, the phase standard current is, Distributing coefficients for the phase currents; when the current is in the phase A conduction interval, the phase A is the main conduction phase, and the phase A is standard current The method comprises the following steps: at this time, the B-phase standard current and the C-phase standard current are zero; The value of the three-phase composite current is measured under different rotating speeds and torque conditions; when the current is in the B-phase conduction interval, the B-phase is the main conduction phase, and the B-phase standard current The standard current of the A phase and the standard current of the C phase are zero; When the current is in the C-phase conduction interval, the C-phase is the main conduction phase, and the C-phase standard current The standard current of the A phase and the standard current of the B phase are zero; according to the relation between magnetic flux and current, the total magnetic flux of the three-phase switch reluctance motor when no turn-to-turn short circuit fault occurs is expressed as: Wherein, the Is the total magnetic flux of the three-phase switch reluctance, And Respectively representing the normal actual current of the non-fault phase and the normal actual current of the fault phase when no turn-to-turn short circuit fault occurs; And The normal inductance of the non-fault phase and the normal inductance of the fault phase when the turn-to-turn short circuit fault does not occur are respectively; After the fault phase has turn-to-turn short circuit fault, the magnetic flux attenuation coefficient mu of the fault phase is expressed as: Wherein, the As the magnetic flux of the failed phase, For normal magnetic flux of the fault phase when no turn-to-turn short circuit fault occurs, 0< mu <1; In order to ensure that the output torque and the rotating speed of the three-phase switch reluctance motor are close to given values after the inter-turn short circuit fault occurs, the total magnetic flux of the three-phase switch reluctance motor when the inter-turn short circuit fault occurs is equal to the total magnetic flux of the three-phase switch reluctance motor when the inter-turn short circuit fault does not occur: Wherein, the And The non-faulted phase desired current and the faulted phase desired current, respectively, are represented as: The phase current distribution coefficient is obtained through deduction: calibrating the magnetic flux attenuation coefficient mu of the fault phase under different fault degrees through experiments, and calculating the phase current distribution coefficient And finally generating the expected current of each phase.
4. The fault-tolerant control method for turn-to-turn short circuit faults of a switched reluctance motor based on current reconstruction compensation according to claim 3, wherein the specific implementation process of the step 4 is as follows: The value rule of the control signal S output by the fault-tolerant controller is as follows: Wherein, the 、 And Respectively represents an A-phase control signal, a B-phase control signal and a C-phase control signal which are output by the fault-tolerant controller, 、 And The current is a phase A actual current, a phase B actual current and a phase C actual current respectively.
5. The fault-tolerant control method for turn-to-turn short circuit faults of a switched reluctance motor based on current reconstruction compensation according to claim 4, wherein the specific implementation process of the step 5 is as follows: the control signal S F takes the value: the control signal S act output by the control module is a control signal output by direct transient torque control, and is expressed as: Wherein, the 、 And The control signals respectively represent a control signal of the A phase, a control signal of the B phase and a control signal of the C phase, and the value is 1 or 0; For control signals of phase A, when When the phase A winding is in exciting mode, the phase inductance stores energy and the phase current rises When the phase A winding works in a zero-voltage follow current mode, the energy stored in the winding is consumed in the internal resistance of the winding, and the phase current is reduced; For control signals of phase B, when When the B phase winding is in exciting mode, the phase inductance stores energy and the phase current rises When the phase B winding works in a zero-voltage follow current mode, the energy stored in the winding is consumed in the internal resistance of the winding, and the phase current is reduced; For control signals of phase C, when When the C phase winding is in exciting mode, the phase inductance stores energy and the phase current rises When the C-phase winding works in a zero-voltage follow current mode, the energy stored in the winding is consumed in the internal resistance of the winding, and the phase current is reduced.
6. The fault-tolerant control method for turn-to-turn short circuit faults of a switched reluctance motor based on current reconstruction compensation according to claim 5, wherein the specific implementation process of the step 6 is as follows: when the three-phase switch reluctance motor does not have the inter-turn short circuit fault, the final control signal S F-act =S act , and when the three-phase switch reluctance motor has the inter-turn short circuit fault, the final control signal S F-act =S F .

Description

Current reconstruction compensation-based switch reluctance motor turn-to-turn short circuit fault tolerance control method Technical Field The invention belongs to the field of motor control, and particularly relates to a switched reluctance motor turn-to-turn short circuit fault tolerance control method based on current reconstruction compensation. Background The Switched Reluctance Motor (SRM) has wide application prospect in the fields of industrial driving, new energy equipment and the like by virtue of the advantages of stable structure, strong fault tolerance potential and the like. However, the SRM has the inherent characteristics of remarkable nonlinear characteristics and non-sinusoidal current waveforms, so that the control strategy of the SRM is essentially different from that of other motor systems, the SRM cannot be directly transplanted, the damage of turn-to-turn short circuit faults in winding faults is particularly prominent, the fault phase current exponentially increases, the winding is easy to overheat and burn out, the original current distribution rule is damaged, magnetic flux distortion and torque pulsation are aggravated, and the output performance and operation safety of the motor are seriously affected. When detecting winding faults, the current mainstream fault-tolerant control method generally adopts a fault phase isolation processing mode, and although the fault phase isolation processing mode is simple and direct, the fault-tolerant control method inevitably leads to significant reduction of output performance, aggravation of torque pulsation and incapability of meeting high-reliability application requirements. Meanwhile, the fault-tolerant control methods of the traditional direct current motor system, induction motor system and permanent magnet synchronous motor system cannot be directly transplanted to the SRM system due to the difference of motor characteristics. Therefore, it is necessary to provide a software-based fault-tolerant control method for the turn-to-turn short circuit fault of the switched reluctance motor, so as to inhibit peak current of the turn-to-turn short circuit fault, and reduce torque pulsation and motor rotation speed fluctuation of the motor after the fault. Disclosure of Invention The invention provides a switched reluctance motor turn-to-turn short circuit fault tolerance control method based on current reconstruction compensation, which aims to solve the problems of current surge, torque pulsation aggravation, output performance reduction and insufficient robustness of a traditional fault tolerance strategy under an SRM turn-to-turn short circuit fault. The technical scheme of the invention is as follows: a switched reluctance motor turn-to-turn short circuit fault tolerance control method based on current reconstruction compensation comprises the following steps: Step 1, judging whether an inter-turn short circuit fault occurs according to the acquired phase current and rotor position of the three-phase switch reluctance motor, if the inter-turn short circuit fault does not occur, jumping to step 6, and if the inter-turn short circuit fault occurs, operating step 2; step 2, judging a conduction interval according to the rotor position of the three-phase switch reluctance motor; Aiming at a three-phase switch reluctance motor, the division rule of the conduction interval is as follows: When theta is [ theta on,θoff ], the phase-A conduction interval is located, when theta is [ theta on+15°,θoff+15° ], the phase-B conduction interval is located, and when theta is [ theta on+30°,θoff+30° ], the phase-C conduction interval is located; Wherein, theta on and theta off respectively represent an opening angle and a closing angle, and theta represents a rotor position; Step 3, generating a phase expected current according to a phase expected current reconstruction function; The desired current reconstruction function expression for each phase is: Wherein, the In order to achieve a desired current flow,For the phase standard current, the phase standard current is,Distributing coefficients for the phase currents; when the current is in the phase A conduction interval, the phase A is the main conduction phase, and the phase A is standard current The method comprises the following steps: at this time, the B-phase standard current and the C-phase standard current are zero; The value of the three-phase composite current is measured under different rotating speeds and torque conditions; when the current is in the B-phase conduction interval, the B-phase is the main conduction phase, and the B-phase standard current The standard current of the A phase and the standard current of the C phase are zero; When the current is in the C-phase conduction interval, the C-phase is the main conduction phase, and the C-phase standard current The standard current of the A phase and the standard current of the B phase are zero; according to the relation between magnetic f