CN110875700B - Motor phase sequence reverse connection fault diagnosis method and system - Google Patents
Motor phase sequence reverse connection fault diagnosis method and system Download PDFInfo
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Abstract
The invention discloses a motor phase sequence reverse connection fault diagnosis method and a system, comprising the following steps: based on the current converter driving mode, obtaining output voltage information and current information of a rear end motor of each converter according to the obtained output voltage information and current information of each converter in the locomotive; according to the output voltage information and the current information of each converter rear-end motor, observing the torque of each converter rear-end motor, obtaining a fault diagnosis index for each converter, determining a corresponding reference value, and calculating the deviation of the corresponding index and the reference value; and judging the reverse connection condition of the phase sequence of the motor connected with the rear end of each converter by using a preset deviation threshold value according to the deviation of the index of each converter and the reference value. The invention finds the fault before the converter reports the overcurrent fault or quickly positions the fault after the converter has the overcurrent fault, thereby quickly finding and locking the fault for technicians, improving the availability of the system and having simple implementation process.
Description
Technical Field
The invention relates to the field of motor fault detection, in particular to a motor phase sequence reverse connection fault diagnosis method and system.
Background
In a newly repaired or overhauled locomotive or motor train, the power of the locomotive is very large, and the locomotive is often dragged by the whole vehicle under the common output of a plurality of motors, wherein the condition that the phase sequence of individual traction motors is reversed may occur. Since most of the motors are in a normal wiring state, the direction of the whole train of locomotives is still the same as the set direction. Under the action of other motors, the motors with opposite phase sequences are in an electromagnetic braking state, the motors in the state not only can absorb electric power from the converter, but also can absorb mechanical power from the rotating shaft, the power is consumed on the motors, the motors generate heat seriously, and compared with the motors with normal wiring, the current of the motors is obviously increased, and the motors cannot run for a long time. The reverse connection of the motor phase sequence can cause the current transformer to report overcurrent faults and even tube faults. Therefore, it is necessary to detect the reverse phase sequence of the motor.
In the prior art, few detection methods and systems for motor phase sequence reverse connection are involved, so that the motor phase sequence reverse connection condition is detected in advance, and the fault is quickly positioned after the reverse connection condition occurs, so that a finished automobile system has certain potential safety hazards.
Disclosure of Invention
In order to solve the technical problem, the invention provides a motor phase sequence reverse connection fault diagnosis method, which comprises the following steps: the method comprises the steps that firstly, based on a current converter driving mode, output voltage information and current information of a rear end motor of each converter are obtained according to the obtained output voltage information and current information of each converter in a locomotive; step two, observing the torque of the rear end motor of each converter according to the output voltage information and the current information of the rear end motor of each converter, obtaining a fault diagnosis index for each converter, determining a corresponding reference value, and calculating the deviation of the corresponding index and the reference value; and thirdly, judging the reverse connection condition of the phase sequence of the motor connected with the rear end of each converter by using a preset deviation threshold value according to the deviation of the index and the reference value of each converter.
Preferably, in the second step, the method further comprises: calculating the single-phase current effective value of a motor at the rear end of each converter, and performing low-pass filtering processing on an observation result; and obtaining a corresponding first diagnosis index according to the low-pass filtering processing result and the corresponding single-phase current effective value of the motor, and taking the first diagnosis index as the fault diagnosis index.
Preferably, in the second step, the method further comprises: observing the stator flux linkage amplitude or the rotor flux linkage amplitude of the motor at the rear end of each converter; and further utilizing the stator flux linkage amplitude or the rotor flux linkage amplitude to obtain a second diagnostic index according to the first diagnostic index, and taking the second diagnostic index as the fault diagnostic index.
Preferably, in the second step, when the number of converters of the entire vehicle is 2, the fault diagnosis index of each converter is used as the reference value of another converter, and the deviation of the index of each converter from the reference value is calculated by using the following expression:
where FI denotes the deviation of the indicator of the current converter from a reference value, y1Representing said fault diagnosis indicator, y, of one of the converters2Representing said fault diagnosis indicator of the other converter.
Preferably, in the second step, when the number of the current transformers of the entire vehicle is greater than 2, the fault diagnosis index of each current transformer is detected to obtain a diagnosis index average value, the diagnosis index average value is further used as the reference value of each current transformer, and the deviation between the index and the reference value of each current transformer is calculated by using the following expression:
wherein, FIkRepresents the deviation of said index of the k-th converter from a reference value, ykAnd the fault diagnosis index of the kth converter is represented, k represents the converter arrangement serial number, and y' represents the average value of the diagnosis indexes.
Preferably, in the third step, the corresponding deviation threshold is set according to the number of the motors connected to the rear end of each converter, and further, when it is detected that the deviation between the current index and the reference value is less than or equal to the deviation threshold, it is determined that all the motors connected to the rear end of the current converter are normally connected.
Preferably, in the third step, when it is detected that the deviation between the current index and the reference value is greater than the deviation threshold, if the number of the inverters of the whole locomotive is only 2, the phase sequence of the motor connected to the rear end of one of the inverters is in reverse connection.
Preferably, in the third step, when it is detected that the deviation between the current index and the reference value is greater than the deviation threshold, if the number of converters of the whole locomotive is greater than 2, it is determined that the motor connected to the rear end of the current converter is in reverse phase sequence.
In another aspect, the invention further provides a system for diagnosing a phase sequence reverse connection fault of a motor, which comprises the following modules: the motor current and voltage generating module is used for obtaining output voltage information and current information of a rear end motor of each converter according to the obtained output voltage information and current information of each converter in the locomotive based on the current converter driving mode; the deviation calculation module is configured to observe the torque of each converter rear-end motor according to the output voltage information and the current information of each converter rear-end motor, obtain a fault diagnosis index for each converter, determine a corresponding reference value, and calculate the deviation between the corresponding index and the reference value; and the diagnosis comparison module is configured to judge the reverse connection condition of the phase sequence of the motor connected to the rear end of each converter by using a preset deviation threshold value according to the deviation of the index and the reference value of each converter.
Preferably, the diagnostic comparison module includes a fault determination unit, wherein the fault determination unit is configured to determine that the motor connected to the rear end of the current converter is in reverse phase-sequence connection if the number of converters of the entire locomotive is greater than 2 when it is detected that the deviation of the current index from the reference value is greater than the deviation threshold.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the invention can detect the fault before the overcurrent fault is reported by the converter or quickly position the fault after the overcurrent fault occurs in the converter, quickly locks, finds and locks the fault for technicians, improves the usability of the system, has simple realization process and can be embedded into a control chip of a transmission control unit of the whole vehicle.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a step diagram of a motor phase sequence reverse connection fault diagnosis method according to an embodiment of the present application.
Fig. 2 is a specific flowchart of a motor phase sequence reverse connection fault diagnosis method according to an embodiment of the present application.
Fig. 3 is a block diagram of a phase-sequence reverse connection fault diagnosis system of a motor according to an embodiment of the present application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Because most of the motors in the whole locomotive are in a normal wiring state, the direction of the whole locomotive is still the same as the set direction. Under the action of other motors, the motors with opposite phase sequences are in an electromagnetic braking state, the motors in the state not only can absorb electric power from the converter, but also can absorb mechanical power from the rotating shaft, the power is consumed on the motors, the motors generate heat seriously, and compared with the motors with normal wiring, the current of the motors is obviously increased, and the motors cannot run for a long time. The reverse connection of the motor phase sequence can cause the current transformer to report overcurrent faults and even tube faults. Therefore, it is necessary to detect the reverse phase sequence of the motor.
In the prior art, few detection methods and systems for motor phase sequence reverse connection are involved, so that the motor phase sequence reverse connection condition is detected in advance, and the fault is quickly positioned after the reverse connection condition occurs, so that a finished automobile system has certain potential safety hazards.
The invention provides a motor phase sequence reverse connection fault diagnosis method and a system, the method and the system firstly estimate and observe the torque (shaft control) or average torque (frame control or vehicle control) of a converter rear connection motor by acquiring output voltage and current signals of the converter, then calculate a fault diagnosis index, compare the index with a reference value, and calculate the deviation between the index and the reference value. Further, if the deviation is greater than the corresponding threshold, it indicates that there is a phase sequence reversal fault. Therefore, the fault can be found before the converter reports the overcurrent fault or can be quickly positioned after the converter has the overcurrent fault, so that the fault can be quickly found and locked by technicians, and the availability of the system is improved.
Fig. 1 is a step diagram of a motor phase sequence reverse connection fault diagnosis method according to an embodiment of the present application. As shown in fig. 1, the motor phase sequence reverse connection fault diagnosis method includes steps S110 to S130. In step S110, based on the current converter driving mode, the output voltage information and the current information of the rear end motor of each converter are obtained according to the obtained output voltage information and current information of each converter in the locomotive. In step S120, the torque of each converter rear end motor is observed according to the output voltage information and the current information of each converter rear end motor, a fault diagnosis index for each converter is obtained, a corresponding reference value is determined, and a deviation between the corresponding index and the reference value is calculated. In step S130, a phase sequence reverse connection condition of the motor connected to the rear end of each converter is determined by using a preset deviation threshold according to a deviation of the index for each converter from the reference value. Further, when the abnormal condition of the reverse connection of the phase sequence of the motor connected to the rear end of the converter is judged, the converter with the reverse connection condition of the phase sequence is determined, so that technical maintenance personnel can check and lock the fault motor.
Fig. 2 is a specific flowchart of a motor phase sequence reverse connection fault diagnosis method according to an embodiment of the present application. The method for diagnosing the phase sequence reverse connection fault of the whole motor is described in detail with reference to fig. 1 and 2.
In step S110, it is necessary to first obtain output information and current information of each converter in the whole locomotive, and estimate (simulate) voltage information and current information of a rear end motor of each converter according to a current converter driving mode.
Specifically, the three-phase current signals corresponding to the current information output by the converters are obtained by using the current sensors in the corresponding traction converters in the existing locomotive, and the corresponding A-phase current i of each converter is obtainedINVAPhase i of B-phase currentINVBAnd C phase current iINVC。
Preferably, in one embodiment, a star connection method is often adopted for the motor in the rail transit field, so that only two-phase currents in the motor need to be measured to obtain three-phase currents of the converter. Specifically, the current sensors are used for measuring A, B two-phase currents of i respectivelyINVAAnd iINVBPhase i of C currentINVCCan pass through iINVC＝-iINVA-iINVB(formula 1).
Furthermore, the three-phase current signals corresponding to the current information output by the converters can be obtained by the means of the prior art, and the corresponding A-phase voltage u of each converter is obtainedINVAPhase u of B phaseINVBAnd a phase u of C voltageINVC. Among them, the common methods are: 1) calculating the output voltage of the converter by using a voltage reconstruction mode; 2) measuring the output voltage of the converter by using a voltage sensor; 3) a given approximation of the voltage in the converter is considered to be the output voltage of the converter.
Further, since the driving patterns of the inverter in each locomotive are not uniform (i.e., the inverter drives the rear end motor in a non-uniform number) according to the inverter driving patterns, the output voltage information and the current information for calculating each inverter rear end motor are also different. The common driving modes of the converter comprise: a shaft control mode (one converter rear end only drives one motor), a frame control mode (one converter rear end drives 2 motors), a vehicle control mode (one converter rear end drives 4 motors), and the like.
Specifically, in one embodiment, when one inverter drives only one motor (the driving mode of the inverter is the shaft control mode), the current and voltage of the motor are equal to the current and voltage output by the inverter, i.e., iA＝iINVA(formula 2), iB＝iINVB(formula 3), iC＝iINVC(formula 4) uA＝uINVA(formula 5), uB＝uINVB(formula 6), uC＝uINVC(formula 7). Wherein iARepresenting the A-phase current of the motor, iBRepresenting the B-phase current of the motor, iCRepresents the C-phase current of the motor, uARepresenting the A-phase voltage, u, of the motorBRepresenting the B-phase voltage, u, of the motorCRepresenting the C-phase voltage of the motor.
In one embodiment, when one converter drives multiple motors (e.g., the driving mode of the converter is rack control or vehicle control), the present invention estimates (simulates) the (average) current information and (average) voltage information of the rear end motor of each converter. Since a plurality of motors connected to the same converter are connected in parallel with each other, the respective phase currents of the motors can be calculated using the following expressions:
in the formula, n represents the number of (parallel) motors connected to the rear end of each converter. The average voltage information of each phase of the motor can be calculated by the above equations (5) to (7).
Referring again to fig. 1 and 2, in step S120, it is necessary to observe the torque information of the rear end motor of each converter according to the output voltage information and the current information of the rear end motor of each converter, further calculate the fault diagnosis index of each converter according to the observation result of the motor torque, and evaluate the fault diagnosis index of each converter, so as to obtain the deviation between the index of each converter and the reference value.
First, the observation process of the rear end motor of each converter needs to be explained. After (average) voltage information and (average) current information of the rear end motor of each converter are calculated, stator flux linkage information is obtained by using an integrator or a low-pass filter according to the stator resistance of the motor and the output voltage information and the current information of the rear end motor of each converter, and a corresponding motor (average) torque observation result is obtained according to the motor pole logarithm information.
Specifically, according to the common general knowledge in the field of motor control technology, there are many motor torque observation methods including a method of observing torque on a synchronous coordinate system as well as a stationary coordinate system. One specific implementation of observing torque is given below.
Firstly, the α component and the β component of the motor current and the α component and the β component of the motor voltage are calculated according to the output voltage information and the current information of the motor at the rear end of each converter and by using the following expressions:
wherein u issαRepresentation (Current)Converter back-end) motor voltage alpha component, usβRepresenting the beta component, i, of the motor voltage (at the rear of the current transformer)sαRepresenting the alpha component, i, of the motor current (at the rear of the current transformer)sβRepresents (at the rear of the current transformer) the beta component of the motor current, C represents the transformation matrix of the three-phase stationary frame to the two-phase stationary orthogonal frame,
and then, continuously acquiring the stator flux linkage information of the motor. In one embodiment, the stator flux linkage information is obtained by integration according to the methods shown in equations (13) and (14). Wherein, formula (13) and formula (14) are respectively expressed as:
ψsα＝∫(usα-Rsisα)dt (13)
ψsβ＝∫(usβ-Rsisβ)dt (14)
wherein R issRepresenting (rear of the current transformer) stator resistance of the machine, psisαRepresenting the alpha component, ψ, of the stator flux linkagesβRepresenting the beta component of the stator flux linkage. In addition, in another embodiment, in engineering application, the direct current drift of the signal sampling in the engineering application can be further overcome by replacing the integrators in the equations (13) and (14) with low-pass filters to obtain accurate stator flux linkage information, considering the influence of the direct current drift of the AD sampling.
Then, after the electronic flux linkage information of the motor is obtained, the torque of the motor can be observed by the following formula (15) according to the pole pair number information of the motor, and a corresponding (average) torque observation result can be obtained. Wherein formula (15) is represented as:
Te＝np(isβψsα-isαψsβ) (15)
in the formula, TeIndicating the observed torque of the machine (at the rear of the current transformer), npRepresenting the number of pole pairs of the motor (at the rear end of the current transformer).
The motor current information and the motor voltage information are calculated by detecting the current information and the voltage information of the inverter by a sensor in the inverter, and therefore the motor observation result is obtained based on the calculated motor current information and voltage information. And because of the phase sequence reverse connection fault of the rear end motor of the converter, the current and voltage information of the converter connected with the fault motor can be greatly different from those of the converters with all normal wiring conditions of other rear end motors. Therefore, the (average) torque observation result of the rear end motor of the converter connected with the fault motor is greatly different from all the converters with normal wiring conditions of other rear end motors, further, the calculated fault diagnosis indexes of each converter (the fault diagnosis indexes are obtained according to the calculated motor current information and voltage information and the torque observation result, wherein the torque observation result is the observation result of the motor under the ideal condition simulated under the condition that the wiring of the rear end motor of each converter is normal) need to be compared pairwise, the converter corresponding to the fault diagnosis index with the larger difference compared with the fault diagnosis indexes corresponding to the other converters is screened, and therefore the condition that the motor connected with the rear end of the converter has phase sequence reverse connection fault is determined.
Further, in the process of calculating the fault diagnosis index of each rear end motor, (the first embodiment) it is necessary to calculate the single-phase current effective value of each rear end motor of the converter first, and perform low-pass filtering on the observation result, further, by using the following equation (16), divide the low-pass filtering result and the corresponding single-phase current effective value of the motor to obtain the corresponding first diagnosis index (it can also be said that the corresponding first diagnosis index is obtained according to the low-pass filtering result and the corresponding single-phase current effective value of the motor), and use the first diagnosis index as the fault diagnosis index of the corresponding motor. Wherein formula (16) is represented as:
in the formula, ymA first diagnostic indicator, LPF (T), representing the current convertere) Indicating the observed torque TeAnd performing low-pass filtering, wherein I represents the single-phase current effective value of the motor at the rear end of the current transformer, and the single-phase current effective value of the motor is obtained based on the calculated motor current information. When the motor is normally wired, the effective values of the currents of each phase of the motor in normal operation are all equal.
In addition, in the process of calculating the fault diagnosis index of each rear-end motor, the stator flux linkage amplitude or the rotor flux linkage amplitude of each rear-end motor of each converter needs to be observed, further, the first diagnosis index and the stator flux linkage amplitude are subjected to division operation, or the first diagnosis index and the rotor flux linkage amplitude are subjected to division operation, so that a second diagnosis index is obtained, and the second diagnosis index is used as the fault diagnosis index.
Specifically, (the second embodiment) requires observation of the stator flux linkage amplitude of the rear end motor of each converter, and further obtains a second diagnostic index by dividing the first diagnostic index by the stator flux linkage amplitude by the following equation (17), and uses the second diagnostic index as the failure diagnostic index. In addition, when the second diagnostic index is calculated, the rotor flux linkage amplitude of the motor at the rear end of each converter can be observed in addition to the stator flux linkage amplitude, and further, the first diagnostic index and the rotor flux linkage amplitude are divided by the following formula (18) to obtain a second diagnostic index, and the second diagnostic index is used as the fault diagnostic index. Wherein formula (16) and formula (17) are respectively represented as:
in the formula, ynIndicating a second diagnostic index, ψ, of the current convertersRepresenting the stator flux linkage amplitude, ψ, of the current converter back-end motorrAnd representing the rotor flux linkage amplitude of the motor at the rear end of the current transformer, wherein the stator and rotor flux linkage amplitudes are obtained by a flux linkage observation method based on the calculated motor current information and voltage information, and the flux linkage observation method is a common method in the field of motor control, so that the details are not repeated herein.
Next, after the fault diagnosis index of each converter is calculated, it is necessary to evaluate the fault diagnosis index of each converter so as to obtain the deviation for each converter.
In one embodiment, when one locomotive has only 2 converters, the fault diagnosis indexes of each converter are mutually used as reference values of the other converter, and the deviation of the index of each converter from the reference values is calculated by using the following expression:
where FI represents the deviation of the current converter's index from the reference value, y1Indicating a fault diagnosis indicator, y, of one of the converters2Indicating a fault diagnosis indicator for the other converter.
In another embodiment, when one locomotive has more than 2 converters, a fault diagnosis index of each converter is detected, a diagnosis index average value is obtained, the diagnosis index average value is further used as a reference value of each converter, and the deviation of the index of each converter from the reference value is calculated by using the following expression:
wherein, FIkIndicating the deviation of the index of the kth converter from the reference value, ykAnd the fault diagnosis indexes of the kth converter are shown, k is the converter arrangement serial number, and y' is the average value of the diagnosis indexes. In determining a diagnostic indexIn the process of the average value, most motors are normally connected and the states of all the current transformers are consistent, so that fault diagnosis indexes of most of the current transformers are the same or similar. Therefore, when calculating the above-mentioned average value of the diagnosis indexes, it is necessary to obtain the average value of the failure diagnosis indexes (values) of the remaining converters excluding the failure diagnosis indexes (values) of the failed converters. Specifically, the determination method of the average value of the diagnostic index is represented by the following expression:
wherein n represents the total number of current transformers in the whole locomotive, ykmaxMaximum value, y, of fault diagnosis indicators corresponding to all converterskminAnd representing the minimum value of the fault diagnosis indexes corresponding to all the converters.
As shown in fig. 1 and fig. 2, after obtaining the deviation between the index of each current transformer and the reference value, (step S130) it is necessary to set a corresponding deviation threshold FI for the current transformer of the whole locomotive in advanceth. Specifically, a corresponding deviation threshold is set according to the current converter driving mode and the number of motors connected to the rear end of each converter. In the setting process of the deviation threshold, it should be noted that, firstly, the more motors driven by each converter, the corresponding deviation threshold FIthThe smaller the value is; second, the deviation threshold FIthThe size of the error is not too large or too small, and if the size is too large, the effective range of the diagnostic algorithm is reduced, and if the size is too small, erroneous judgment is easily caused by noise, torque observation errors and the like. In one embodiment, if the inverter driving modes of the whole locomotive adopt the rack control mode, that is, each inverter drives two motors, the deviation threshold FI is setthMay be set to 20%.
Further, the deviation threshold FI of the current transformer is utilizedthAnd judging the reverse connection condition of the phase sequence of the motor connected with the rear end of each converter. In this process, referring to fig. 2, it is necessary to determine the reverse connection condition of each converter, and first determine the current converter currently being detectedDeviation of the index from the reference value and the magnitude of the deviation threshold; and under the condition that the deviation of the index of the current converter and the reference value is detected to be larger than the deviation threshold value, obtaining a corresponding judgment result further according to the number of the converters in the whole locomotive. And finally, after all the converters are judged completely, ending the flow of the motor phase sequence reverse connection fault diagnosis method of the whole locomotive, and otherwise, continuously detecting the next converter.
Specifically, in one embodiment, in the case that it is detected that the deviation of the index of the current converter from the reference value is smaller than or equal to the corresponding deviation threshold value, all the motors connected to the rear end of the corresponding current converter are normally wired.
In one embodiment, when it is detected that the deviation between the index of the current converter and the reference value is greater than the corresponding deviation threshold value, if the number of the converters of the whole locomotive is only 2, the phase sequence of the motor connected to the rear end of one of the two converters is reverse.
In one embodiment, when it is detected that the deviation between the index of the current converter and the reference value is greater than the corresponding deviation threshold value, if the number of the converters of the whole locomotive is greater than 2, the corresponding situation that the motors connected to the rear ends of the currently detected converters are in reverse phase sequence exists.
On the other hand, the invention also provides a motor phase sequence reverse connection fault diagnosis system. Fig. 3 is a block diagram of a phase-sequence reverse connection fault diagnosis system of a motor according to an embodiment of the present application. As shown in fig. 3, the system includes: a motor current voltage generation module 31, a deviation calculation module 32 and a diagnostic comparison module 33.
Specifically, the motor current and voltage generating module 31 is implemented according to all the methods described in step S110, and can obtain the output voltage information and the current information of the rear end motor of each converter according to the obtained output voltage information and current information of each converter in the locomotive based on the current converter driving mode.
Next, the deviation calculation module 32 will be explained. The deviation calculating module 32 is implemented according to the whole method described in the step S120, and can observe the torque of the rear end motor of each converter according to the output voltage information and the current information of the rear end motor of each converter, obtain the fault diagnosis index for each converter, determine the corresponding reference value, and calculate the deviation between the corresponding index and the reference value. Further, the deviation calculation module 32 includes: torque observation unit 321, diagnostic index determination unit 322, and deviation determination unit 323. The torque observation unit 321 is configured to obtain stator flux linkage information by using an integrator or a low-pass filter according to the motor stator resistance and output voltage information and current information of the motor at the rear end of each converter, and further obtain a corresponding motor (average) torque observation result according to the motor pole pair number information.
The diagnosis index determining unit 322 is configured to calculate a single-phase current effective value of a rear end motor of each converter, perform low-pass filtering processing on the observation result, further obtain a corresponding first diagnosis index according to the low-pass filtering processing result and the corresponding single-phase current effective value of the motor by using equation (16), and use the first diagnosis index as the fault diagnosis index.
In addition, the diagnosis index determining unit 322 may be further configured to calculate the single-phase current effective value of each converter rear end motor, perform low-pass filtering processing on the observation result, observe the stator flux linkage amplitude of each converter rear end motor, further obtain a corresponding second diagnosis index according to the low-pass filtering processing result and the corresponding single-phase current effective value and stator flux linkage amplitude of the motor by using equation (17), and use the second diagnosis index as the fault diagnosis index.
In addition, the diagnosis index determining unit 322 may be further configured to calculate the single-phase current effective value of each converter rear end motor, perform low-pass filtering processing on the observation result, observe the rotor flux linkage amplitude of each converter rear end motor, further obtain a corresponding second diagnosis index according to the low-pass filtering processing result and the corresponding single-phase current effective value and rotor flux linkage amplitude of the motor by using equation (18), and use the second diagnosis index as the fault diagnosis index.
It should be noted that the diagnostic indicator determining unit 322 may perform the function of determining the fault diagnostic indicator in any one of the manners described above, and the present invention is not limited to this.
The deviation determination unit 323 obtains the fault diagnosis index of each converter from the diagnosis index determination unit 322, and calculates the deviation of the index of each converter from the reference value by using the above equation (19) or equation (20). When the number of the current transformers of the whole vehicle is 2, the fault diagnosis index of each current transformer is used as a reference value of the other current transformer; and when the number of the current transformers of the whole vehicle is more than 2, detecting the fault diagnosis index of each current transformer, obtaining a diagnosis index average value by using the formula (21), and further taking the diagnosis index average value as a reference value of each current transformer.
Finally, the diagnostic comparison module 33 is explained. The diagnosis and comparison module 33 is executed according to the whole method described in the above step S130, and can determine the reverse connection condition of the phase sequence of the motor connected to the rear end of each converter by using the preset deviation threshold of the current converter of the whole locomotive according to the deviation of the index of each converter from the reference value. Further, the diagnosis comparison module 33 includes a deviation threshold storage unit 331 and a failure determination unit 332. The deviation threshold storage unit 331 stores a preset deviation threshold (parameter) for the current converter of the current locomotive. The deviation threshold value is set according to the current converter driving mode and the number of the motors connected to the rear end of each converter.
When detecting a phase-sequence reverse connection fault of each converter, the fault determination unit 332 retrieves a corresponding deviation threshold from the deviation threshold storage unit 331, retrieves a deviation between an index corresponding to the currently detected converter and a reference value from the deviation determination unit 323, and detects the current converter using the two parameters.
Specifically, (first embodiment) in the case where it is detected that the deviation of the current index from the reference value is smaller than or equal to the corresponding deviation threshold value, it is determined that all the motors connected to the rear end of the current converter are wired normally.
(second embodiment) in the case where it is detected that the deviation between the current index and the reference value is greater than the corresponding deviation threshold value, if the number of the inverters of the entire locomotive is only 2, the motor connected to the rear end of one of the inverters may be in reverse phase-sequence connection.
(third embodiment) when the deviation of the current index and the reference value is detected to be larger than the corresponding deviation threshold value, if the number of the current transformers of the whole locomotive is larger than 2, the situation that the motor connected with the rear end of the current transformer which is currently detected is in reverse phase sequence connection is judged.
The invention provides a motor phase sequence reverse connection fault diagnosis method and system, and the core idea is to estimate the average torque of a motor by using a motor model with normal wiring and further obtain a fault diagnosis index corresponding to a torque-current ratio. If all the motors behind the converters are normally connected, the sizes of fault diagnosis indexes in the converters are basically the same, and the deviation value of the corresponding index and a reference value is close to 0; if the phase sequence of the motor is reversely connected behind the converter, the fault diagnosis index of the converter is greatly different from other converters, the deviation value of the corresponding index and the reference value exceeds a certain value, and the value is set as a deviation threshold value. The method can effectively diagnose the phase sequence reverse connection fault of the motor, has high fault diagnosis accuracy, does not need to increase any hardware cost, has simple algorithm realization, and can be embedded into a control chip of a transmission control unit.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A motor phase sequence reverse connection fault diagnosis method comprises the following steps:
the method comprises the steps that firstly, based on a current converter driving mode, output voltage information and current information of a motor connected with the rear end of each converter are obtained according to the obtained output voltage information and current information of each converter in a locomotive;
step two, according to the output voltage information and the current information of the motor connected with the rear end of each converter, observing the torque of the motor connected with the rear end of each converter, obtaining a fault diagnosis index for each converter, determining a corresponding reference value, and calculating the deviation between the corresponding fault diagnosis index and the reference value, wherein the method comprises the following steps:
calculating a single-phase current effective value of a motor connected to the rear end of each converter, performing low-pass filtering processing on an observation result, obtaining a corresponding first diagnosis index according to the low-pass filtering processing result and the corresponding single-phase current effective value of the motor, and taking the first diagnosis index as the fault diagnosis index; or,
observing a stator flux linkage amplitude or a rotor flux linkage amplitude of a motor connected to the rear end of each converter, then obtaining a second diagnosis index by using the stator flux linkage amplitude or the rotor flux linkage amplitude according to the first diagnosis index, and taking the second diagnosis index as the fault diagnosis index;
and thirdly, judging the reverse connection condition of the phase sequence of the motor connected with the rear end of each converter by using a preset deviation threshold value according to the deviation of the fault diagnosis index and the reference value of each converter.
2. The method according to claim 1, wherein in the second step, when the number of converters of the whole vehicle is 2, the fault diagnosis index of each converter is taken as the reference value of another converter, and the deviation of the fault diagnosis index of each converter from the reference value is calculated by using the following expression:
wherein FI represents said fault of the current converterDeviation of the diagnostic index from a reference value, y1Representing said fault diagnosis indicator, y, of one of the converters2Representing said fault diagnosis indicator of the other converter.
3. The method according to claim 1 or 2, characterized in that in the second step, when the number of converters of the whole vehicle is greater than 2, the fault diagnosis index of each converter is detected to obtain a diagnosis index average value, the diagnosis index average value is further used as the reference value of each converter, and the deviation of the fault diagnosis index of each converter from the reference value is calculated by using the following expression:
wherein, FIkRepresenting the deviation of said fault diagnosis indicator of the kth converter from a reference value, ykAnd the fault diagnosis index of the kth converter is represented, k represents the converter arrangement serial number, and y represents the average value of the diagnosis indexes.
4. Method according to claim 1 or 2, characterized in that in step three, the respective deviation threshold is set according to the number of connected electrical machines at the rear end of each converter, and further,
and under the condition that the deviation of the current fault diagnosis index and the reference value is detected to be less than or equal to the deviation threshold value, judging that all the motor wires connected with the rear end of the current converter are normal.
5. The method according to claim 1 or 2, characterized in that, in step three,
and under the condition that the deviation of the current fault diagnosis index and the reference value is larger than the deviation threshold value, if the number of the current transformers of the whole locomotive is only 2, the condition that the motor connected with the rear end of one current transformer is in reverse phase sequence exists in the two current transformers.
6. The method according to claim 1 or 2, characterized in that, in step three,
and under the condition that the deviation of the current fault diagnosis index and the reference value is larger than the deviation threshold value, if the number of the current converters of the whole locomotive is larger than 2, judging that the condition that the motor connected with the rear end of the current converter is in reverse phase sequence connection exists.
7. The system for diagnosing the phase sequence reverse connection fault of the motor is characterized by comprising the following modules:
the motor current and voltage generating module is used for obtaining output voltage information and current information of a motor connected with the rear end of each converter according to the obtained output voltage information and current information of each converter in the locomotive based on the current converter driving mode;
the deviation calculation module is configured to observe the torque of the motor connected to the rear end of each converter according to the output voltage information and the current information of the motor connected to the rear end of each converter, obtain a fault diagnosis index for each converter, determine a corresponding reference value, and calculate the deviation between the corresponding fault diagnosis index and the reference value, and includes:
calculating a single-phase current effective value of a motor connected to the rear end of each converter, performing low-pass filtering processing on an observation result, obtaining a corresponding first diagnosis index according to the low-pass filtering processing result and the corresponding single-phase current effective value of the motor, and taking the first diagnosis index as the fault diagnosis index; or,
observing a stator flux linkage amplitude or a rotor flux linkage amplitude of a motor connected to the rear end of each converter, then obtaining a second diagnosis index by using the stator flux linkage amplitude or the rotor flux linkage amplitude according to the first diagnosis index, and taking the second diagnosis index as the fault diagnosis index;
and the diagnosis comparison module is configured to judge the reverse connection condition of the phase sequence of the motor connected to the rear end of each converter by using a preset deviation threshold according to the deviation of the fault diagnosis index and the reference value of each converter.
8. The system of claim 7, wherein the diagnostic comparison module comprises a fault determination unit, wherein,
and the fault determination unit is configured to determine that the motor connected to the rear end of the current converter is in reverse phase sequence if the number of the current converters of the whole locomotive is greater than 2 when the deviation of the current fault diagnosis index from the reference value is greater than the deviation threshold value.
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| CN103248307A (en) * | 2013-05-24 | 2013-08-14 | 哈尔滨工业大学 | Fault diagnosis method for current sensor in induction motor speed regulating system |
| CN106998169A (en) * | 2016-01-26 | 2017-08-01 | 株式会社日立制作所 | Power-converting device |
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| CN103248307A (en) * | 2013-05-24 | 2013-08-14 | 哈尔滨工业大学 | Fault diagnosis method for current sensor in induction motor speed regulating system |
| CN106998169A (en) * | 2016-01-26 | 2017-08-01 | 株式会社日立制作所 | Power-converting device |
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