CN115987172B - Double-salient motor current sensor signal loss fault tolerance control method - Google Patents
Double-salient motor current sensor signal loss fault tolerance control method Download PDFInfo
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- CN115987172B CN115987172B CN202310071942.8A CN202310071942A CN115987172B CN 115987172 B CN115987172 B CN 115987172B CN 202310071942 A CN202310071942 A CN 202310071942A CN 115987172 B CN115987172 B CN 115987172B
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Abstract
The method aims at the doubly salient motor comprising two current sensors, when the occurrence of the signal loss fault of the current sensors is determined, a driving system of the doubly salient motor is controlled according to a corresponding fault-tolerant control method in a corresponding electric angle interval, so that the feedback value of a current loop can still be accurately obtained through another current sensor, the fault-tolerant operation of the system under the signal loss fault of the current sensor can be realized, the phenomenon of overcurrent of the doubly salient motor is avoided, and the torque pulsation is reduced.
Description
Technical Field
The application relates to the field of doubly salient motors, in particular to a doubly salient motor current sensor signal loss fault tolerance control method.
Background
The double salient pole motor is a novel motor developed on the basis of a switched reluctance motor, the stator and the rotor of the double salient pole motor are of salient pole structures, the three-phase armature winding is intensively arranged on the stator, and the rotor is free of windings, so that the double salient pole motor has the advantages of simple structure, flexible control, good fault tolerance, suitability for high-speed operation and the like, and becomes a research hot spot.
A common control strategy for doubly salient motor drive systems is rotational speed current double closed loop control, wherein the current closed loop requires accurate phase current feedback information. However, during the operation of the doubly salient motor driving system, a signal loss fault of the current sensor is easy to occur, for example, a patent with the application number of 2022106211142 and the patent name of "a method for diagnosing signal loss fault of a doubly salient motor current sensor" discloses a method for detecting whether a signal loss fault occurs in the current sensor. The signal loss fault of the current sensor is represented by constant 0 of sensor output, when the signal loss fault exists in the current sensor, the current sensor can enable the doubly salient motor to generate large phase current so as to possibly burn out the phase windings of the doubly salient motor, large torque pulsation can be generated, and the doubly salient motor can be stopped when serious.
Disclosure of Invention
Aiming at the problems and the technical requirements, the applicant provides a doubly salient motor current sensor signal loss fault tolerance control method, and the technical scheme of the application is as follows:
a double-salient motor current sensor signal loss fault tolerance control method comprises the steps that one ends of an A-phase winding, a B-phase winding and a C-phase winding of a double-salient motor are respectively connected to a bridge arm midpoint of a first bridge arm, a bridge arm midpoint of a second bridge arm and a bridge arm midpoint of a third bridge arm of a bridge type converter, the other ends of the three phase windings are connected to realize star connection, a first current sensor is connected with the A-phase winding in series, and a second current sensor is connected with the B-phase winding in series; the fault tolerance control method for the signal loss fault of the current sensor of the doubly salient motor comprises the following steps:
when the first current sensor is determined to have a signal loss fault, controlling the on-off of each switching tube in the bridge converter according to a first fault-tolerant control method in a first preset electric angle interval of each electric angle period, and taking the absolute value of a current value sensed by the second current sensor as a feedback value of a current loop, wherein the first preset electric angle interval is an electric angle interval in which phase currents of the three-phase winding cannot be obtained through the first current sensor with the signal loss fault;
when the signal loss fault of the second current sensor is determined, controlling the on-off of each switching tube in the bridge converter according to a second fault-tolerant control method in a second preset electrical angle interval of each electrical angle period, and taking the absolute value of the current value sensed by the first current sensor as the feedback value of the current loop; the second predetermined electrical angle section is an electrical angle section in which the phase currents of the three-phase windings cannot be obtained by the second current sensor that has failed in signal loss.
When no signal loss fault occurs in the two current sensors, the upper bridge arm switching tube T1 of the first bridge arm and the lower bridge arm switching tube T2 of the third bridge arm are controlled to be conducted in a first sector of each electric angle period, and other switching tubes are controlled to be turned off; the upper bridge arm switching tube T3 of the second bridge arm and the lower bridge arm switching tube T4 of the first bridge arm are controlled to be conducted in a second sector of each electric angle period, and other switching tubes are controlled to be turned off; in a third sector of each electric angle period, controlling an upper bridge arm switching tube T5 of a third bridge arm and a lower bridge arm switching tube T6 of the second bridge arm to be conducted, and controlling other switching tubes to be turned off;
when the first current sensor is determined to have a signal loss fault, determining a first sector in each electrical angle period as a first preset electrical angle interval;
and when the second current sensor is determined to have a signal loss fault, determining a third sector in each electrical angle period as a second preset electrical angle interval.
The further technical scheme is that the method for controlling the on-off of each switch tube in the bridge converter according to the first fault-tolerant control method in the first preset electric angle interval of each electric angle period comprises the following steps:
in the first sector of each electric angle period, the upper bridge arm switch tube T1 of the first bridge arm and the lower bridge arm switch tube T6 of the second bridge arm are controlled to be conducted, and other switch tubes are controlled to be turned off, so that the current value i sensed by the second current sensor in the first sector LEM2 ＝-i a ＝i b Wherein i is a Representing the phase current of the A-phase winding, i b Representing the phase current of the B phase winding.
The further technical scheme is that the method for controlling the on-off of each switch tube in the bridge converter according to the first fault-tolerant control method in the first preset electric angle interval of each electric angle period comprises the following steps:
in the first sector of each electric angle period, the lower bridge arm switch tube T2 of the third bridge arm and the upper bridge arm switch tube T3 of the second bridge arm are controlled to be conducted, and other switch tubes are controlled to be turned off, so that the current value i sensed by the second current sensor in the first sector LEM2 ＝i b ＝-i c Wherein i is b Representing the phase current of the B-phase winding, i c Representing the phase current of the C-phase winding.
The further technical scheme is that the method for controlling the on-off of each switch tube in the bridge converter according to the second fault-tolerant control method in the second preset electric angle interval of each electric angle period comprises the following steps:
in the third sector of each electric angle period, the upper bridge arm switch tube T1 of the first bridge arm and the lower bridge arm switch tube T6 of the second bridge arm are controlled to be conducted, and other switch tubes are controlled to be turned off, so that the current value i sensed by the first current sensor in the second preset electric angle interval LEM1 ＝i a ＝-i b Wherein i is a Representing the phase current of the A-phase winding, i b Representing the phase current of the B phase winding.
The further technical scheme is that the method for controlling the on-off of each switch tube in the bridge converter according to the second fault-tolerant control method in the second preset electric angle interval of each electric angle period comprises the following steps:
in the third sector of each electric angle period, the lower bridge arm switching tube T4 of the first bridge arm and the upper bridge arm switching tube T5 of the third bridge arm are controlled to be conducted, and other switching tubes are controlled to be turned off, so that the current value i sensed by the first current sensor in the second preset electric angle interval LEM1 ＝i a ＝-i c Wherein i is a Representing the phase current of the A-phase winding, i c Representing the phase current of the C-phase winding.
The beneficial technical effects of this application are:
the utility model discloses a doubly salient motor current sensor signal loss fault tolerance control method, this method is to the doubly salient motor that contains two current sensors, when determining according to the diagnosis of existing method that there is the current sensor signal loss trouble, through corresponding fault tolerance control method to doubly salient motor drive system control, and still can accurately acquire the feedback value of current loop through another current sensor, thereby can avoid doubly salient motor to appear the phenomenon of overcurrent, can realize the system fault tolerance operation under the current sensor signal loss trouble, and reduced torque ripple, through the actual measurement, under the fault tolerance control method of this application, torque output is current sensor normal 5/6, in addition, the method of this application can also be expanded and applied to brushless DC motor drive system current sensor fault tolerance, the application is extensive.
Drawings
Fig. 1 is a schematic diagram of a system topology of a doubly salient motor comprising two current sensors for which the present application is directed.
Fig. 2 is a graph of inductance curves and power tube turn-on logic for three-phase windings of a doubly salient motor when the topology of fig. 1 is controlled in accordance with a three-phase three-beat control method.
Fig. 3 (a) and (b) are inductance curves and power tube conduction logic diagrams of three-phase windings of the doubly salient motor when the first current sensor fails in signal loss according to the first fault-tolerant control method in two different embodiments for the topology structure, respectively.
Fig. 3 (c) and (d) are inductance curves and power tube conduction logic diagrams of the three-phase winding of the doubly salient motor when the second current sensor fails in signal loss according to the second fault-tolerant control method in two different embodiments, respectively, for the topology.
Detailed Description
The following describes the embodiments of the present application further with reference to the accompanying drawings.
The application discloses a doubly salient motor current sensor signal loss fault tolerance control method, which aims at a doubly salient motor comprising two current sensors, please refer to a topological structure of the doubly salient motor comprising the two current sensors shown in fig. 1, a first bridge arm of a bridge type converter comprises an upper bridge arm switch tube T1 and a lower bridge arm switch tube T4, a second bridge arm comprises an upper bridge arm switch tube T3 and a lower bridge arm switch tube T6, a third bridge arm comprises an upper bridge arm switch tube T5 and a lower bridge arm switch tube T2, and two ends of each switch tube in the bridge type converter are connected in parallel with a reverse diode. One end of three bridge arms in the bridge type converter is connected as a winding neutral point N and is connected with a direct current bus U dc The other ends of the three bridge arms in the bridge type converter are connected with each other and are connected with a direct current bus U dc Is a negative electrode of a DC bus U dc And is also connected with a filter capacitor C at both ends 1 。
One ends of the A phase winding, the B phase winding and the C phase winding of the doubly salient motor are respectively connected to the bridge arm midpoint of the first bridge arm, the bridge arm midpoint of the second bridge arm and the bridge arm midpoint of the third bridge arm of the bridge type converter, and the other ends of the three phase windings are connected to realize star connection. The first current sensor LEM1 is connected in series with the a-phase winding and the second current sensor LEM2 is connected in series with the B-phase winding.
When no loss of signal fault occurs in both current sensors LEM1 and LEM2, the current value i sensed by the first current sensor LEM1 is utilized LEM1 And a current value i sensed by the second current sensor LEM2 LEM2 The phase currents of the three-phase windings can be obtained, so that closed-loop control is performed as feedback values of the current loops. When the on-off of the switching tube in the bridge converter is controlled according to the three-phase three-beat control method, the inductance curve and the power tube conduction logic of the three-phase winding of the doubly-salient motor are shown as figure 2, wherein L af Is the self inductance of the A phase winding, L bf Is the self inductance of the B phase winding, L cf Is the self inductance of the C-phase winding. I in each electrical angle period of 0-360 degrees LEM1 、i LEM2 And phase current i of three-phase winding a 、i b And i c The relation of (a) is as follows, the current direction from the midpoint of the bridge arm to the neutral point N of the winding is defined as the positive direction of the current:
(1) When the rotor position angle theta is in a first sector of [0 degrees, 120 degrees ], an upper bridge arm switching tube T1 of the first bridge arm and a lower bridge arm switching tube T2 of the third bridge arm are controlled to be conducted, and other switching tubes are controlled to be turned off. At this time, phase current i of A phase winding a Positive, phase current i of C-phase winding c Is negative. And has i LEM1 ＝i a ＝-i c ，i LEM2 ＝0。
(2) When the rotor position angle theta is in the second sector of [120 degrees, 240 degrees ], the upper bridge arm switching tube T3 of the second bridge arm and the lower bridge arm switching tube T4 of the first bridge arm are controlled to be conducted, and other switching tubes are controlled to be turned off. At this time, phase current i of B phase winding b Positive, phase current i of a phase winding a Is negative. And has i LEM1 ＝-i LEM2 ＝i a ＝-i b 。
(3) When the rotor position angle theta is [240 DEG, 360 DEG ]]When the third sector of the first bridge arm is in the third sector, the upper bridge arm switch tube T5 of the third bridge arm and the lower bridge arm switch tube T6 of the second bridge arm are controlled to be conducted, and other switches are controlledThe switching tube is turned off. At this time, phase current i of C-phase winding c Positive, phase current i of B-phase winding b Is negative. And has i LEM1 ＝0，i LEM2 ＝i c ＝-i b 。
In one case, when it is determined that the first current sensor LEM1 has failed due to loss of signal, i LEM1 When the control method is used for controlling the doubly-salient motor system, the main effect on the doubly-salient motor is that the current value i sensed by the first current sensor LEM1 which has signal loss fault cannot be passed when the rotor position angle theta is in the first sector of [0 DEG ], 120 DEG LEM1 The phase current of the three-phase winding is obtained, so that the current loop cannot acquire an accurate feedback value of the phase current, and the doubly salient motor system cannot normally operate.
The present application uses the electric angle section in which the phase current of the three-phase winding cannot be obtained by the first current sensor LEM1 having the loss of signal fault as the first predetermined electric angle section. When the control is performed according to the three-phase three-beat control method, namely, the first sector in each electric angle period is a first preset electric angle interval. And controlling the on-off of each switching tube in the bridge converter according to a first fault-tolerant control method in a first preset electric angle interval of each electric angle period, and outputting a current value i sensed by a second current sensor LEM2 Absolute value i of (i) LEM2 I is the feedback value of the current loop. And in other electric angle intervals except the first preset electric angle interval in one electric angle period, the on-off of the switching tube in the bridge converter is still controlled according to the control method when no signal loss fault occurs.
The method for controlling the on-off of each switching tube in the bridge converter according to the first fault-tolerant control method comprises two different control methods:
(a) In one embodiment, the upper bridge arm switching tube T1 of the first bridge arm and the lower bridge arm switching tube T6 of the second bridge arm are controlled to be turned on and other switching tubes are controlled to be turned off in a first predetermined electric angle interval, that is, in a first sector in each electric angle period. Referring to the inductance curve and the power tube turn-on logic of the three-phase winding of the doubly salient motor shown in fig. 3 (a), under the first fault-tolerant control method, the power tube turn-on logic in the three sectors of each electrical angle period is changed from T1T2 to T3T4 to T5T6 when no signal loss fault occurs to T1T6 to T3T4 to T5T6.
Under the control of the first fault-tolerant control method of this embodiment, i is performed at each electrical angle cycle of 0 ° to 360 ° LEM1 、i LEM2 And phase current i of three-phase winding a 、i b And i c The relation of (2) is:
in a first predetermined electrical angle range of each electrical angle period, i.e. in the first sector, the switching tubes T1 and T6 are turned on and the other switching tubes are turned off, the phase current i of the phase A winding in the first sector a Positive, phase current i of B-phase winding b Is negative and the current value i sensed by the second current sensor LEM2 LEM2 ＝-i a ＝i b The current value i sensed by the first current sensor LEM1 LEM1 ＝0。
In the second sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the switching tubes T3 and T4 are controlled to be on, and the other switching tubes are controlled to be off, so that the phase current i of the B-phase winding in the second sector b Positive, phase current i of a phase winding a Is negative and has i LEM1 ＝0，i LEM2 ＝-i a ＝i b 。
In the third sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the conduction of T5 and T6 is controlled, and the turn-off of other switching tubes is controlled. Then the phase current i of the C-phase winding in the third sector c Positive, phase current i of B-phase winding b Is negative. And has i LEM1 ＝0，i LEM2 ＝i c ＝-i b 。
(b) In another embodiment, the lower bridge arm switching tube T2 of the third bridge arm and the upper bridge arm switching tube T3 of the second bridge arm are controlled to be turned on and other switching tubes are controlled to be turned off in a first predetermined electric angle interval, that is, in a first sector in each electric angle period. Referring to the inductance curve and the power tube turn-on logic of the three-phase winding of the doubly salient motor shown in fig. 3 (b), under the first fault-tolerant control method, the power tube turn-on logic in the three sectors of each electrical angle period is changed from T1T2→t3t4→t5t6 when no signal loss fault occurs to T2T3→t3t4→t5t6.
Under the control of the first fault-tolerant control method of this embodiment, i is performed at each electrical angle cycle of 0 ° to 360 ° LEM1 、i LEM2 And phase current i of three-phase winding a 、i b And i c The relation of (2) is:
in a first predetermined electrical angle range of each electrical angle period, i.e. in the first sector, the switching tubes T1 and T2 are turned on and the other switching tubes are turned off, the phase current i of the B-phase winding in the first sector b Positive, phase current i of C-phase winding c Is negative and the current value i sensed by the second current sensor LEM2 ＝i b ＝-i c The current value i sensed by the first current sensor LEM1 LEM1 ＝0。
In the second sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the switching tubes T3 and T4 are controlled to be on, and the other switching tubes are controlled to be off, so that the phase current i of the B-phase winding in the second sector b Positive, phase current i of a phase winding a Is negative and has i LEM1 ＝0，i LEM2 ＝-i a ＝i b 。
In the third sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the conduction of T5 and T6 is controlled, and the turn-off of other switching tubes is controlled. Then the phase current i of the C-phase winding in the third sector c Positive, phase current i of B-phase winding b Is negative. And has i LEM1 ＝0，i LEM2 ＝i c ＝-i b 。
In summary, when the first current sensor LEM1 fails due to loss of signal, the first fault-tolerant control method according to any of the embodiments described above is controlled within the first predetermined electrical angle range, and the current value i sensed by the second current sensor is controlled in a fault-tolerant manner LEM2 Absolute value of |i LEM2 Phase currents i of B-phase windings b Therefore, i can be calculated LEM2 And I is used as a feedback value of the current loop to realize fault-tolerant operation of the system.
In another case, when it is determined that the second current sensor LEM2 has a loss of signal failure, i LEM2 When the control method is used for controlling the doubly salient motor system, the main effect on the doubly salient motor is in the third sector, and the rotor position angle theta is [240 DEG, 360 DEG ]]A current value i which cannot be sensed by the second current sensor LEM2 having a loss of signal fault when in the third sector of (a) LEM2 The phase current of the three-phase winding is obtained, so that the current loop cannot acquire an accurate feedback value of the phase current, and the doubly salient motor system cannot normally operate.
The present application uses the electric angle section in which the phase current of the three-phase winding cannot be obtained by the second current sensor LEM2 having the loss of signal fault as the second predetermined electric angle section. When the control is performed according to the three-phase three-beat control method, namely, the third sector in each electric angle period is a second preset electric angle interval. And controlling the on-off of each switching tube in the bridge converter according to a second fault-tolerant control method in a second preset electric angle interval of each electric angle period, and outputting the current value i sensed by the first current sensor LEM1 Absolute value i of (i) LEM1 I is the feedback value of the current loop. And in other electrical angle intervals of one electrical angle period than the second predetermined electrical angle interval, the switching tube in the bridge converter is still controlled according to the control logic when no signal loss fault occurs.
Wherein, controlling the on-off of each switching tube in the bridge converter according to the second fault-tolerant control method comprises two different control methods:
(a) In one embodiment, the upper bridge arm switching tube T1 of the first bridge arm and the lower bridge arm switching tube T6 of the second bridge arm are controlled to be turned on and other switching tubes are controlled to be turned off in a second predetermined electric angle interval, that is, in a third sector in each electric angle period. Referring to the inductance curve and the power tube turn-on logic of the three-phase winding of the doubly salient motor shown in fig. 3 (c), under the second fault-tolerant control method, the power tube turn-on logic in the three sectors of each electrical angle period is changed from T1T2 to T3T4 to T5T6 when no signal loss fault occurs to T1T2 to T3T4 to T1T6.
Under the control of the first fault-tolerant control method of this embodiment, i is performed at each electrical angle cycle of 0 ° to 360 ° LEM1 、i LEM2 And phase current i of three-phase winding a 、i b And i c The relation of (2) is:
in the first sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the switching tubes T1 and T2 are controlled to be on, and the other switching tubes are controlled to be off, so that the phase current i of the phase A winding in the first sector a Positive, phase current i of C-phase winding c Is negative and the value i of the current sensed by the first current sensor LEM1 LEM1 ＝i a ＝-i c The current value i sensed by the second current sensor LEM2 LEM2 ＝0。
In the second sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the switching tubes T3 and T4 are controlled to be on, and the other switching tubes are controlled to be off, so that the phase current i of the B-phase winding in the second sector b Positive, phase current i of a phase winding a Is negative and has i LEM1 ＝i a ＝-i b ，i LEM2 ＝0。
In a second predetermined electrical angle interval of each electrical angle period, namely the third sector, T1 and T6 are controlled to be turned on, and other switching tubes are controlled to be turned off. The phase current i of the a-phase winding in the third sector a Positive, phase current i of B-phase winding b Is negative. And has i LEM1 ＝i a ＝-i b ，i LEM2 ＝0。
(b) In another embodiment, the lower bridge arm switching tube T4 of the first bridge arm and the upper bridge arm switching tube T5 of the third bridge arm are controlled to be turned on and other switching tubes are controlled to be turned off in a second predetermined electric angle interval, that is, in a third sector in each electric angle period. Referring to the inductance curve and the power tube turn-on logic of the three-phase winding of the doubly salient motor shown in fig. 3 (d), under the second fault-tolerant control method, the power tube turn-on logic in the three sectors of each electrical angle period is changed from T1T2 to T3T4 to T5T6 when no signal loss fault occurs to T1T2 to T3T4 to T4T5.
Under the control of the second fault-tolerant control method of this embodiment, i is performed at each electrical angle cycle of 0 ° to 360 ° LEM1 、i LEM2 And phase current i of three-phase winding a 、i b And i c The relation of (2) is:
in the first sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the switching tubes T1 and T2 are controlled to be on, and the other switching tubes are controlled to be off, so that the phase current i of the phase A winding in the first sector a Positive, phase current i of C-phase winding c Is negative and the value i of the current sensed by the first current sensor LEM1 LEM1 ＝i a ＝-i c The current value i sensed by the second current sensor LEM2 LEM2 ＝0。
In the second sector of each electrical angle period, the control is performed according to the control method when no signal loss fault occurs, namely, the switching tubes T3 and T4 are controlled to be on, and the other switching tubes are controlled to be off, so that the phase current i of the B-phase winding in the second sector b Positive, phase current i of a phase winding a Is negative and has i LEM1 ＝i a ＝-i b ，i LEM2 ＝0。
In a second predetermined electrical angle interval of each electrical angle period, namely the third sector, the switching on of the T4 and the T5 is controlled, and the switching off of other switching tubes is controlled. Then the phase current i of the C-phase winding in the third sector c Positive, phase current i of a phase winding a Is negative. And has i LEM1 ＝i a ＝-i c ，i LEM2 ＝0。
In summary, when the second current sensor LEM2 fails due to loss of signal, the first current sensor senses the current value i in the fault-tolerant control regardless of whether the control is performed in the two predetermined electrical angle intervals according to the first fault-tolerant control method of the above embodiment LEM1 Absolute value i of (i) LEM1 The I is A phase windingPhase current i of group a Therefore, i can be calculated LEM1 And I is used as a feedback value of the current loop to realize fault-tolerant operation of the system.
What has been described above is only a preferred embodiment of the present application, which is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present application are to be considered as being included within the scope of the present application.
Claims (5)
1. A double-salient motor current sensor signal loss fault tolerance control method is characterized in that one ends of an A-phase winding, a B-phase winding and a C-phase winding of a double-salient motor are respectively connected to a bridge arm midpoint of a first bridge arm, a bridge arm midpoint of a second bridge arm and a bridge arm midpoint of a third bridge arm of a bridge type converter, the other ends of the three phase windings are connected to realize star connection, a first current sensor is connected with the A-phase winding in series, and a second current sensor is connected with the B-phase winding in series; the doubly salient motor current sensor signal loss fault tolerance control method comprises the following steps:
when the first current sensor is determined to have a signal loss fault, controlling the on-off of each switching tube in the bridge converter according to a first fault-tolerant control method in a first preset electric angle interval of each electric angle period, and taking the absolute value of a current value sensed by the second current sensor as a feedback value of a current loop, wherein the first preset electric angle interval is an electric angle interval in which phase currents of a three-phase winding cannot be obtained through the first current sensor with the signal loss fault;
when the signal loss fault of the second current sensor is determined, controlling the on-off of each switching tube in the bridge converter according to a second fault-tolerant control method in a second preset electric angle interval of each electric angle period, and taking the absolute value of the current value sensed by the first current sensor as a feedback value of a current loop; the second preset electric angle interval is an electric angle interval in which phase currents of the three-phase winding cannot be obtained through the second current sensor with the signal loss fault;
when no signal loss fault occurs in the two current sensors, an upper bridge arm switching tube T1 of a first bridge arm and a lower bridge arm switching tube T2 of a third bridge arm are controlled to be conducted in a first sector of each electric angle period, and other switching tubes are controlled to be turned off; the upper bridge arm switching tube T3 of the second bridge arm and the lower bridge arm switching tube T4 of the first bridge arm are controlled to be conducted in a second sector of each electric angle period, and other switching tubes are controlled to be turned off; in a third sector of each electric angle period, controlling an upper bridge arm switching tube T5 of a third bridge arm and a lower bridge arm switching tube T6 of the second bridge arm to be conducted, and controlling other switching tubes to be turned off;
when the first current sensor is determined to have a signal loss fault, determining a first sector in each electrical angle period as a first preset electrical angle interval;
and when the second current sensor is determined to have a signal loss fault, determining a third sector in each electrical angle period as a second preset electrical angle interval.
2. The fault-tolerant control of loss of signal fault in a current sensor of a doubly-salient machine according to claim 1, wherein the method of controlling the switching of the switching tubes in the bridge converter according to the first fault-tolerant control method within a first predetermined electrical angle interval of each electrical angle period comprises:
in a first sector of each electrical angle period, controlling the upper bridge arm switch tube T1 of the first bridge arm and the lower bridge arm switch tube T6 of the second bridge arm to be conducted, and controlling other switch tubes to be turned off, so that a current value i sensed by the second current sensor in the first sector LEM2 ＝-i a ＝i b Wherein i is a Representing the phase current of the A-phase winding, i b Representing the phase current of the B phase winding.
3. The fault-tolerant control of loss of signal fault in a current sensor of a doubly-salient machine according to claim 1, wherein the method of controlling the switching of the switching tubes in the bridge converter according to the first fault-tolerant control method within a first predetermined electrical angle interval of each electrical angle period comprises:
in the first sector of each electric angle period, controlling the lower bridge arm switching tube T2 of the third bridge arm and the upper bridge arm switching tube T3 of the second bridge arm to be conducted, and controlling other switching tubes to be turned off, so that the current value i sensed by the second current sensor in the first sector LEM2 ＝i b ＝-i c Wherein i is b Representing the phase current of the B-phase winding, i c Representing the phase current of the C-phase winding.
4. The fault-tolerant control of loss of signal fault in a current sensor of a doubly-salient machine according to claim 1, wherein the method of controlling the switching of the switching tubes in the bridge inverter in accordance with the second fault-tolerant control for a second predetermined electrical angle interval of each electrical angle cycle comprises:
in a third sector of each electric angle period, controlling the upper bridge arm switch tube T1 of the first bridge arm and the lower bridge arm switch tube T6 of the second bridge arm to be conducted, and controlling other switch tubes to be turned off, wherein the current value i sensed by the first current sensor in the second preset electric angle interval LEM1 ＝i a ＝-i b Wherein i is a Representing the phase current of the A-phase winding, i b Representing the phase current of the B phase winding.
5. The fault-tolerant control of loss of signal fault in a current sensor of a doubly-salient machine according to claim 1, wherein the method of controlling the switching of the switching tubes in the bridge inverter in accordance with the second fault-tolerant control for a second predetermined electrical angle interval of each electrical angle cycle comprises:
in a third sector of each electric angle period, controlling the lower bridge arm switching tube T4 of the first bridge arm and the upper bridge arm switching tube T5 of the third bridge arm to be conducted, and controlling other switching tubes to be turned off, wherein the current value i sensed by the first current sensor in the second preset electric angle interval LEM1 ＝i a ＝-i c Wherein i is a Representing the phase current of the A-phase winding, i c Representing the phase current of the C-phase winding.
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| CN108988729A (en) * | 2018-06-19 | 2018-12-11 | 浙江大学 | Modularization three-phase switch reluctance machine Fault-Tolerant System and operation method based on full-bridge inverter |
| CN113507252A (en) * | 2021-07-08 | 2021-10-15 | 南京航空航天大学 | Open-circuit fault-tolerant driving system of electro-magnetic doubly salient motor |
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| CN108988729A (en) * | 2018-06-19 | 2018-12-11 | 浙江大学 | Modularization three-phase switch reluctance machine Fault-Tolerant System and operation method based on full-bridge inverter |
| CN113507252A (en) * | 2021-07-08 | 2021-10-15 | 南京航空航天大学 | Open-circuit fault-tolerant driving system of electro-magnetic doubly salient motor |
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