CN108344918B - Fault diagnosis method for converter in switch reluctance motor drive and converter - Google Patents

Fault diagnosis method for converter in switch reluctance motor drive and converter Download PDF

Info

Publication number
CN108344918B
CN108344918B CN201810108036.XA CN201810108036A CN108344918B CN 108344918 B CN108344918 B CN 108344918B CN 201810108036 A CN201810108036 A CN 201810108036A CN 108344918 B CN108344918 B CN 108344918B
Authority
CN
China
Prior art keywords
frequency
converter
signal
driving system
srm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810108036.XA
Other languages
Chinese (zh)
Other versions
CN108344918A (en
Inventor
阿里永瑞
高强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Jiaotong University
Original Assignee
Shanghai Jiaotong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Jiaotong University filed Critical Shanghai Jiaotong University
Priority to CN201810108036.XA priority Critical patent/CN108344918B/en
Publication of CN108344918A publication Critical patent/CN108344918A/en
Application granted granted Critical
Publication of CN108344918B publication Critical patent/CN108344918B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Electric Motors In General (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides a fault diagnosis method of a converter in a switch reluctance motor drive and the converter, wherein the converter comprises: the three-phase converter comprises a three-phase converter body circuit, a standby power switch device and a relay network; and the standby power switch device is electrically connected with the three-phase converter body circuit through a relay network. The method comprises the steps of controlling the on-off of a power switch device of a converter through a control signal, and adding a preset target signal into the control signal; and then acquiring the amplitude and the frequency of the high-frequency current signal when the power switching device of the converter is in different states, and finally determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal. Therefore, the fault of the power switching device is detected without adding an additional sensor, the complexity of the system is reduced, the fault type and the fault position of the converter can be determined in real time, and the method is high in precision and high in speed.

Description

Fault diagnosis method for converter in switch reluctance motor drive and converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a fault diagnosis method for a converter in a switch reluctance motor drive and the converter.
Background
A Switched Reluctance Motor (SRM) is used in electric vehicle/hybrid drive applications due to its superior fault tolerance and reliable structure. The converter is a core device in a switched reluctance motor driving system.
However, power switching devices in SRM drive systems are prone to failure under harsh environments and repetitive loads, particularly during speed transients and braking. Switching faults of a converter can generally be distinguished as short-circuit faults and open-circuit faults. Currently, there are many diagnostic methods for converter switch faults, such as determining open and short circuit faults using dc bus current, phase current detection, locating switch faults using freewheeling current and bus current, or analyzing switch faults using fuzzy analysis methods such as neural networks, fourier transforms, etc.
However, when open and short circuit faults are determined using dc bus current, phase current detection, additional sensors are required, thus increasing the cost and complexity of the SRM drive system. When the switch fault is analyzed by fuzzy analysis methods such as a neural network and Fourier transform, the problem of poor real-time performance often exists.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a fault diagnosis method for a converter in a switched reluctance motor drive and the converter.
In a first aspect, the present invention provides a method for diagnosing a fault of a converter in a switched reluctance motor drive, including:
generating a control signal for controlling a power switch device of a converter in a Switched Reluctance Motor (SRM) driving system, wherein a preset target signal is added into the control signal; the preset target signal includes: a preset high-frequency voltage signal or a preset high-frequency current signal;
controlling the on-off of a power switch device of the converter through the control signal;
obtaining the amplitude and the frequency of a high-frequency current signal when a power switch device of a converter is in different states, wherein the high-frequency current signal refers to: obtaining a corresponding difference signal after subtracting a reference current signal I _ ref of an SRM driving system and a feedback current signal I _ m of the SRM driving system, and filtering the difference signal to obtain a signal;
and determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal.
Optionally, when the switched reluctance motor SRM driving system including the current loop is applied, the generating a control signal for controlling a power switch device of a converter in the switched reluctance motor SRM driving system includes:
acquiring a difference signal of a reference current signal I _ ref of the SRM driving system and a feedback current signal I _ m of the SRM driving system;
inputting the difference signal into a proportional-integral controller PI to obtain a reference voltage signal V _ ref;
adding the reference voltage signal V _ ref and a preset high-frequency voltage signal V _ HF to obtain a combined voltage signal V _ sum;
the pulse width modulation PWM signal is generated by combining the voltage signal V _ sum and the carrier signal, and the PWM signal is used as a control signal.
Alternatively, when the switched reluctance motor SRM driving system including the hysteresis current controller is applied, the generating a control signal for controlling a power switching device of a converter in the switched reluctance motor SRM driving system includes:
adding a reference current signal I _ ref of an SRM driving system and a preset high-frequency current signal I _ HF to obtain a combined current signal I _ sum;
and subtracting the combined current signal I _ sum and a feedback current signal I _ m of the SRM driving system, inputting the subtracted combined current signal I _ sum and the feedback current signal I _ m into a hysteresis current controller, and taking an output signal of the hysteresis current controller as a control signal.
Optionally, the obtaining the amplitude and the frequency of the high-frequency current signal when the power switching device of the converter is in different states includes:
acquiring the amplitude and frequency of high-frequency current signals of each phase of an SRM driving system when an upper bridge arm power switching device of the converter is in a conducting or disconnecting state; acquiring the amplitude and frequency of high-frequency current signals of each phase of the SRM driving system when the lower bridge arm power switching device of the converter is in a conducting or disconnecting state;
the high-frequency current signal of the phase A of the SRM driving system refers to: obtaining a corresponding difference signal by subtracting a reference current signal of an A phase of an SRM driving system and a feedback current signal of the A phase of the SRM driving system, and filtering the difference signal to obtain a signal;
the high-frequency current signal of the B phase of the SRM driving system refers to: obtaining a corresponding difference signal by subtracting a reference current signal of a phase B of the SRM driving system and a feedback current signal of the phase B of the SRM driving system, and filtering the difference signal to obtain a signal;
the high-frequency current signal of the C phase of the SRM driving system refers to: after subtraction operation is carried out on the reference current signal of the C phase of the SRM driving system and the feedback current signal of the C phase of the SRM driving system, a corresponding difference signal is obtained, and the difference signal is filtered to obtain a signal.
Optionally, the determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal includes:
when a certain phase current of the SRM driving system is less than a preset second phase currentA threshold value koWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is smaller than the preset frequency, the power switch device of an upper bridge arm in the converter of the SRM driving system has an open-circuit fault;
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is smaller than a preset amplitude and the frequency is equal to a preset frequency, an open-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is larger than a preset second threshold value ksWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is smaller than the preset frequency, a short-circuit fault exists in a power switch device of an upper bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is larger than a preset second threshold value k after reaching the turn-off anglesAnd the amplitude of the high-frequency current signal is equal to a preset amplitude before reaching a turn-off angle, and when the frequency is equal to a preset frequency before reaching the turn-off angle, a short-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system.
Optionally, the determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal includes:
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is smaller than a preset amplitude and the frequency is smaller than a preset frequency, an open-circuit fault exists in a power switch device of an upper bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is equal to the preset frequency, the power switch device of the lower bridge arm in the converter of the SRM driving system has an open-circuit fault;
when the A-phase current of the SRM driving system is larger than a preset second threshold value ksAnd when the amplitude of the high-frequency current signal is reduced to zero and the frequency is less than the preset frequency, the converter of the SRM driving systemThe power switch device of the middle-upper bridge arm has short-circuit fault;
when the A-phase current of the SRM driving system is larger than a preset second threshold value k after reaching the turn-off anglesAnd the amplitude of the high-frequency current signal is equal to a preset amplitude before reaching a turn-off angle, and when the frequency is equal to a preset frequency before reaching the turn-off angle, a short-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system.
Optionally, a preset first threshold koA second threshold K preset to multiply the value of the reference current signal I _ ref by a factor K1sMultiplying the value of the reference current signal I _ ref by a factor K2; the values of K1 and K2 are determined by the switched reluctance motor SRM.
In a second aspect, the present invention provides an inverter applied to the inverter fault diagnosis method of the switched reluctance motor drive system according to any one of the first aspects; the converter includes: the three-phase converter comprises a three-phase converter body circuit, a standby power switch device and a relay network; the standby power switch device is electrically connected with the three-phase converter body circuit through a relay network; the base electrodes of a power switch device and a standby power switch device in the three-phase converter body circuit receive control signals, and the control signals are used for controlling the on-off of the power switch device and the standby power switch device in the three-phase converter body circuit;
when the open-circuit fault of the power switch device in the three-phase converter body circuit is detected, the standby power device replaces the power switch device in the open-circuit state in the three-phase converter body circuit by the relay network.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a fault diagnosis method of a converter in a switch reluctance motor drive and the converter, which control the on-off of a power switch device of the converter through a control signal and add a preset target signal into the control signal; and then acquiring the amplitude and the frequency of the high-frequency current signal when the power switching device of the converter is in different states, and finally determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal. Therefore, the fault of the power switching device is detected without adding an additional sensor, the complexity of the system is reduced, the fault type and the fault position of the converter can be determined in real time, and the method is high in precision and high in speed.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram illustrating a principle of determining a converter fault by using a high-frequency voltage signal method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the principle of obtaining the amplitude and frequency of the high-frequency current signal according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the principle of determining converter faults by adding high frequency current signals according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a converter circuit having two additional power switching devices in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a converter circuit having four additional power switches in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a simulation result of fault-tolerant operation when a short-circuit fault occurs on a 1500rpm tube in a simulation example of the present invention, in which: (a) the schematic diagram of the change of the phase A current with time, (b) the schematic diagram of the change of the high-frequency current with time, (c) the schematic diagram of the change of the frequency of the high-frequency current with time, (d) the schematic diagram of the change of the electromagnetic torque with time, (e) the schematic diagram of the change of the speed with time, (f) the schematic diagram of the change of the fault mark of the power electronic switch of the upper bridge arm and the lower bridge arm with time;
FIG. 7 is a diagram illustrating simulation results of fault-tolerant operation when a 1000rpm lower tube has a short-circuit fault in a simulation example of the present invention, in which: (a) the schematic diagram of the change of the phase A current with time, (b) the schematic diagram of the change of the high-frequency current with time, (c) the schematic diagram of the change of the frequency of the high-frequency current with time, (d) the schematic diagram of the change of the electromagnetic torque with time, (e) the schematic diagram of the change of the speed with time, (f) the schematic diagram of the change of the fault mark of the power electronic switch of the upper bridge arm and the lower bridge arm with time;
FIG. 8 is a diagram illustrating simulation results of fault-tolerant operation when a short-circuit fault occurs on a 500rpm tube in a simulation example of the present invention, in which: (a) the schematic diagram of the change of the phase A current with time, (b) the schematic diagram of the change of the high-frequency current with time, (c) the schematic diagram of the change of the frequency of the high-frequency current with time, (d) the schematic diagram of the change of the electromagnetic torque with time, (e) the schematic diagram of the change of the speed with time, (f) the schematic diagram of the change of the fault mark of the power electronic switch of the upper bridge arm and the lower bridge arm with time;
FIG. 9 is a diagram illustrating simulation results of fault-tolerant operation when a 500rpm lower tube has a short-circuit fault according to a simulation example of the present invention, in which: (a) the schematic diagram of the change of the phase A current with time, (b) the schematic diagram of the change of the high-frequency current with time, (c) the schematic diagram of the change of the frequency of the high-frequency current with time, (d) the schematic diagram of the change of the electromagnetic torque with time, (e) the schematic diagram of the change of the speed with time, (f) the schematic diagram of the change of the fault mark of the power electronic switch of the upper bridge arm and the lower bridge arm with time;
FIG. 10 is a schematic diagram of the diagnosis result of the open-tube fault at 900rpm according to a simulation example of the present invention, in which: (a) the graph is a graph showing the change of A-phase current with time, (b) a graph showing the change of high-frequency current with time, (c) a graph showing the change of the frequency of the high-frequency current with time, (d) a graph showing the change of a fault mark with time;
FIG. 11 is a schematic diagram of a diagnosis result of a short-circuit fault of a 1800rpm lower tube in a simulation example of the present invention, wherein: (a) the graph is a graph showing the change of the A-phase current with time, (b) a graph showing the change of the high-frequency current with time, (c) a graph showing the change of the frequency of the high-frequency current with time, and (d) a graph showing the change of a fault mark with time;
FIG. 12 is a schematic diagram of the diagnosis result of the short-circuit fault on the tube at 1800rpm according to a simulation example of the present invention, in which: (a) the A-phase current is changed along with time, (b) the high-frequency current is changed along with time, (c) the frequency of the high-frequency current is changed along with time, and (d) the fault mark is changed along with time.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a fault diagnosis method for a converter in a switch reluctance motor drive, which comprises the following steps:
generating a control signal for controlling a power switch device of a converter in a Switched Reluctance Motor (SRM) driving system, wherein a preset target signal is added into the control signal; the preset target signal includes: a preset high-frequency voltage signal or a preset high-frequency current signal;
controlling the on-off of a power switch device of the converter through the control signal;
obtaining the amplitude and the frequency of a high-frequency current signal when a power switch device of a converter is in different states, wherein the high-frequency current signal refers to: obtaining a corresponding difference signal after subtracting a reference current signal I _ ref of an SRM driving system and a feedback current signal I _ m of the SRM driving system, and filtering the difference signal to obtain a signal;
and determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal.
As shown in fig. 1, in order to adopt a principle schematic diagram of adding a high-frequency voltage signal to determine a converter fault, when the method is applied to a switched reluctance motor SRM driving system including a current loop, a difference signal between a reference current signal I _ ref of the SRM driving system and a feedback current signal I _ m of the SRM driving system is obtained first; then inputting the difference signal into a proportional-integral controller PI to obtain a reference voltage signal V _ ref; adding the reference voltage signal V _ ref and a preset high-frequency voltage signal V _ HF to obtain a combined voltage signal V _ sum; the pulse width modulation PWM signal is generated by combining the voltage signal V _ sum and the carrier signal, and the PWM signal is used as a control signal.
Referring to fig. 2, for a schematic diagram of the principle of obtaining the amplitude and frequency of the high-frequency current signal, please refer to fig. 1 and 2, when a Pulse Width Modulation (PWM) signal generated by V _ sum and a carrier signal is applied to the upper arm power electronic switch of the converter, the high-frequency current signal is generated in the phase current. The generated high frequency signal may be obtained by passing the difference between the detected phase current and the reference phase current through a band pass filter. The frequency of the filtered high-frequency current signal can be obtained by a zero-crossing detection technology, and the specific extraction process is shown in fig. 2. Wherein PI is a proportional-integral controller.
As shown in fig. 3, for a schematic diagram of a principle of determining a converter fault by adding a high-frequency current signal, when the method is applied to a switched reluctance motor SRM driving system including a hysteresis current controller, a reference current signal I _ ref of the SRM driving system is first added to a preset high-frequency current signal I _ HF to obtain a combined current signal I _ sum; and then carrying out subtraction operation on the combined current signal I _ sum and a feedback current signal I _ m of the SRM driving system, inputting the subtracted signal into a hysteresis current controller, and taking an output signal of the hysteresis current controller as a control signal.
Further, when the power switching device of the upper bridge arm of the converter is in a conducting or disconnecting state, the amplitude and the frequency of a high-frequency current signal of each phase of the SRM driving system are obtained; and acquiring the amplitude and the frequency of a high-frequency current signal of each phase of the SRM driving system when the lower bridge arm power switching device of the converter is in a conducting or disconnecting state.
Specifically, in some embodiments of the present invention, the high-frequency current signal of the phase a of the SRM driving system refers to: the method comprises the steps of obtaining corresponding difference signals after subtracting a reference current signal of an A phase of the SRM driving system and a feedback current signal of the A phase of the SRM driving system, and obtaining signals after filtering the difference signals. The high-frequency current signal of the B phase of the SRM driving system refers to: and subtracting the reference current signal of the phase B of the SRM driving system and the feedback current signal of the phase B of the SRM driving system to obtain a corresponding difference signal, and filtering the difference signal to obtain a signal. The high-frequency current signal of the C phase of the SRM driving system refers to: after subtraction operation is carried out on the reference current signal of the C phase of the SRM driving system and the feedback current signal of the C phase of the SRM driving system, a corresponding difference signal is obtained, and the difference signal is filtered to obtain a signal.
The determination of converter faults by adding high-frequency voltage signals is described in detail by taking the fault diagnosis of the power switching device of the phase a of the SRM driving system as an example, and is specifically shown in tables 1 and 2.
TABLE 1 open-Circuit Fault diagnosis analysis of Power switching device of phase A
Specifically, as shown in table 1, when a certain phase current of the SRM driving system is less than a preset first threshold koAnd when the amplitude of the high-frequency current signal is reduced to zero and the frequency is less than the preset frequency, the power switch device of the upper bridge arm in the converter of the SRM driving system has an open-circuit fault. When the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is smaller than a preset amplitude and the frequency is equal to a preset frequency, an open-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system;
specifically, as shown in table 2, when the a-phase current of the SRM driving system is greater than the preset second threshold ksAnd when the amplitude of the high-frequency current signal is reduced to zero and the frequency is less than the preset frequency, the power switch device of the upper bridge arm in the converter of the SRM driving system has a short-circuit fault. When the A-phase current of the SRM driving system is larger than a preset second threshold value k after reaching the turn-off anglesAnd the amplitude of the high-frequency current signal is equal to a preset amplitude before reaching a turn-off angle, and when the frequency is equal to a preset frequency before reaching the turn-off angle, a short-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system.
Table 2 short-circuit fault diagnosis analysis of power switching device of phase a
Regarding the determination of converter faults by adding high-frequency current signals, the present embodiment takes the fault diagnosis of the power switching device of phase a of the SRM driving system as an example, and is specifically described as shown in tables 3 and 4.
TABLE 3 open-circuit Fault diagnosis analysis of Power switching device of phase A
Specifically, as shown in table 3, when the a-phase current of the SRM driving system is less than the preset first threshold koAnd when the amplitude of the high-frequency current signal is smaller than the preset amplitude and the frequency is smaller than the preset frequency, the power switch device of the upper bridge arm in the converter of the SRM driving system has an open-circuit fault. When the A-phase current of the SRM driving system is smaller than a preset first threshold value koAnd when the amplitude of the high-frequency current signal is reduced to zero and the frequency is equal to the preset frequency, the power switch device of the lower bridge arm in the converter of the SRM driving system has an open-circuit fault.
Specifically, as shown in table 4, when the a-phase current of the SRM driving system is greater than the preset second threshold ksAnd when the amplitude of the high-frequency current signal is reduced to zero and the frequency is less than the preset frequency, the power switch device of the upper bridge arm in the converter of the SRM driving system has a short-circuit fault. When the A-phase current of the SRM driving system is larger than a preset second threshold value k after reaching the turn-off anglesAnd the amplitude of the high-frequency current signal is equal to a preset amplitude before reaching a turn-off angle, and when the frequency is equal to a preset frequency before reaching the turn-off angle, a short-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system.
TABLE 4 short-circuit Fault diagnosis analysis of Power switching device of phase A
In a preferred embodiment of the present invention, the preset first threshold k isoAs a reference current signalThe value of the number I _ ref is multiplied by a factor K1, a preset second threshold value KsMultiplying the value of the reference current signal I _ ref by a factor K2; the values of K1 and K2 are determined by the switched reluctance motor SRM.
In a preferred embodiment of the present invention, the value of K1 can be 1.3, and the value of K2 can be 0.75. It should be noted that the values of K1 and K2 are not limited in the present invention, and the values of K1 and K2 can be adjusted for different motors.
The invention also provides a converter, and a converter fault diagnosis method of the switched reluctance motor driving system can be applied to any one of the converter fault diagnosis methods. Wherein the converter comprises: the three-phase converter comprises a three-phase converter body circuit, a standby power switch device and a relay network; the standby power switch device is electrically connected with the three-phase converter body circuit through a relay network; the base electrodes of a power switch device and a standby power switch device in the three-phase converter body circuit receive control signals, and the control signals are used for controlling the on-off of the power switch device and the standby power switch device in the three-phase converter body circuit; when the open-circuit fault of the power switch device in the three-phase converter body circuit is detected, the standby power device replaces the power switch device in the open-circuit state in the three-phase converter body circuit by the relay network.
FIG. 4 is a schematic diagram of a converter circuit having two additional power switching devices; fig. 5 is a schematic diagram of a converter circuit having four additional power switches. As shown in fig. 4 and 5. On the basis of the original converter, the embodiment has additional power switching devices and relay networks. When a power switch failure is detected, the relay corresponding to the power switch failure is closed, so that the failed power switch is replaced by a normal switch, and the continuous operation of the driving system is ensured. For example, when switch S1 fails open, relay R1 closes, so that switch S7 replaces S1, thereby allowing the converter to continue normal operation. The topology shown in fig. 4 can respectively realize fault tolerance of the power electronic switches on any upper bridge arm and any lower bridge arm at most, and the topology shown in fig. 5 can respectively realize fault tolerance of the power electronic switches on any two upper bridge arms and any two lower bridge arms at most. Of course, the number of fault tolerant switches can be further increased by adding additional backup power electronic switches and relay networks on the basis of fig. 4 and 5.
In one embodiment of the invention, the standby power switch device and the relay network are arranged, so that the converter has certain fault-tolerant capability and the continuous operation of the driving system is ensured.
Simulation results of fault diagnosis based on high-frequency voltage injection are presented in fig. 6 to 9, in which: fig. 6 and 7 show simulation waveforms of the a-phase upper arm and lower arm power electronic switches when a short-circuit fault occurs, where the fault occurs when t is 0.084 seconds. As a result, the fault is identified rapidly, and the system operates normally after fault-tolerant control. In fig. 6 and 7, phase a current (unit a), filtered high-frequency current (unit a), frequency of the high-frequency current (unit Hz), total torque (unit Nm) and speed (unit rpm) which are electromagnetic torques, and short-circuit fault signals which are fault flags of the upper and lower arm power electronic switches can be obtained.
Fig. 8 and 9 show simulation waveforms when the a-phase upper arm and lower arm power electronic switches have an open-circuit fault, respectively, where the fault occurs at t-0.082 seconds. As a result, the fault is identified rapidly, and the system operates normally after fault-tolerant control. In fig. 8 and 9, the graph (a) shows the phase a current (unit a), and the graph (b) shows the filtered high-frequency current (unit a), the frequency of the high-frequency current (unit Hz), the total torque (unit Nm) which is the electromagnetic torque, the speed (unit rpm), and the open-circuit fault signal of the upper and lower arm power electronic switch fault flag.
Fig. 10 to 12 present simulation results of fault diagnosis based on high-frequency current signal injection, and it can be seen from these simulation results that the effectiveness of the method in this embodiment can be verified according to the simulation results based on the simulation results of fault diagnosis of open-circuit and short-circuit of the power electronic switch based on high-frequency current signal injection.
According to the embodiment, the fault detection method and the fault detection device of the power switching device do not need to add an additional sensor to detect the fault of the power switching device, the complexity of the system is reduced, the fault type and the fault position of the converter can be determined in real time, and the method and the fault detection device of the power switching device are high in precision and high in speed.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (7)

1. A method of diagnosing a fault in a converter in a switched reluctance motor drive, comprising:
generating a control signal for controlling a power switch device of a converter in a Switched Reluctance Motor (SRM) driving system, wherein a preset target signal is added into the control signal; the preset target signal includes: a preset high-frequency voltage signal or a preset high-frequency current signal;
controlling the on-off of a power switch device of the converter through the control signal;
obtaining the amplitude and the frequency of a high-frequency current signal when a power switch device of a converter is in different states, wherein the high-frequency current signal refers to: obtaining a corresponding difference signal after subtracting a reference current signal I _ ref of an SRM driving system and a feedback current signal I _ m of the SRM driving system, and filtering the difference signal to obtain a signal;
and determining the fault type of the converter in the SRM driving system according to the amplitude and the frequency of the high-frequency current signal.
2. The method of diagnosing a fault in a converter in a Switched Reluctance Motor (SRM) drive system according to claim 1, wherein the generating a control signal for controlling a power switching device of the converter in the SRM drive system when applied to the SRM drive system including a current loop, comprises:
acquiring a difference signal of a reference current signal I _ ref of the SRM driving system and a feedback current signal I _ m of the SRM driving system;
inputting the difference signal into a proportional-integral controller PI to obtain a reference voltage signal V _ ref;
adding the reference voltage signal V _ ref and a preset high-frequency voltage signal V _ HF to obtain a combined voltage signal V _ sum;
the pulse width modulation PWM signal is generated by combining the voltage signal V _ sum and the carrier signal, and the PWM signal is used as a control signal.
3. The method of diagnosing a fault in a converter in a Switched Reluctance Motor (SRM) drive system according to claim 1, wherein the generating a control signal for controlling a power switching device of the converter in the SRM drive system when applied to the SRM drive system including a hysteresis current controller, comprises:
adding a reference current signal I _ ref of an SRM driving system and a preset high-frequency current signal I _ HF to obtain a combined current signal I _ sum;
and subtracting the combined current signal I _ sum and a feedback current signal I _ m of the SRM driving system, inputting the subtracted combined current signal I _ sum and the feedback current signal I _ m into a hysteresis current controller, and taking an output signal of the hysteresis current controller as a control signal.
4. The method for diagnosing the failure of the converter in the drive of the switched reluctance motor according to any one of claims 1 to 3, wherein the obtaining of the amplitude and the frequency of the high frequency current signal when the power switching devices of the converter are in different states comprises:
acquiring the amplitude and frequency of high-frequency current signals of each phase of an SRM driving system when an upper bridge arm power switching device of the converter is in a conducting or disconnecting state; acquiring the amplitude and frequency of high-frequency current signals of each phase of the SRM driving system when the lower bridge arm power switching device of the converter is in a conducting or disconnecting state;
the high-frequency current signal of the phase A of the SRM driving system refers to: obtaining a corresponding difference signal by subtracting a reference current signal of an A phase of an SRM driving system and a feedback current signal of the A phase of the SRM driving system, and filtering the difference signal to obtain a signal;
the high-frequency current signal of the B phase of the SRM driving system refers to: obtaining a corresponding difference signal by subtracting a reference current signal of a phase B of the SRM driving system and a feedback current signal of the phase B of the SRM driving system, and filtering the difference signal to obtain a signal;
the high-frequency current signal of the C phase of the SRM driving system refers to: after subtraction operation is carried out on the reference current signal of the C phase of the SRM driving system and the feedback current signal of the C phase of the SRM driving system, a corresponding difference signal is obtained, and the difference signal is filtered to obtain a signal.
5. The method of diagnosing a fault in a converter in a switched reluctance motor drive according to claim 2, wherein the determining a type of the fault of the converter in the SRM drive system based on the magnitude and the frequency of the high frequency current signal comprises:
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is smaller than the preset frequency, the power switch device of an upper bridge arm in the converter of the SRM driving system has an open-circuit fault;
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is smaller than a preset amplitude and the frequency is equal to a preset frequency, an open-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is larger than a preset second threshold value ksWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is smaller than the preset frequency, a short-circuit fault exists in a power switch device of an upper bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is larger than a preset second threshold value k after reaching the turn-off anglesAnd the amplitude of the high-frequency current signal is equal to the preset amplitude before reaching the turn-off angle, and the frequency is equal to the preset amplitude before reaching the turn-off angleAt a frequency of (d), a short circuit fault exists in the power switching device of the lower bridge arm in the converter of the SRM drive system.
6. The method of diagnosing a fault in a converter in a switched reluctance motor drive according to claim 3, wherein the determining a type of the fault of the converter in the SRM drive system based on the magnitude and the frequency of the high frequency current signal comprises:
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is smaller than a preset amplitude and the frequency is smaller than a preset frequency, an open-circuit fault exists in a power switch device of an upper bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is smaller than a preset first threshold value koWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is equal to the preset frequency, the power switch device of the lower bridge arm in the converter of the SRM driving system has an open-circuit fault;
when the A-phase current of the SRM driving system is larger than a preset second threshold value ksWhen the amplitude of the high-frequency current signal is reduced to zero and the frequency is smaller than the preset frequency, a short-circuit fault exists in a power switch device of an upper bridge arm in a converter of the SRM driving system;
when the A-phase current of the SRM driving system is larger than a preset second threshold value k after reaching the turn-off anglesAnd the amplitude of the high-frequency current signal is equal to a preset amplitude before reaching a turn-off angle, and when the frequency is equal to a preset frequency before reaching the turn-off angle, a short-circuit fault exists in a power switch device of a lower bridge arm in a converter of the SRM driving system.
7. The method of diagnosing a failure of a converter in a switched reluctance motor drive according to claim 5 or 6, wherein a preset first threshold value k is setoA second threshold K preset to multiply the value of the reference current signal I _ ref by a factor K1sMultiplying the value of the reference current signal I _ ref by a factor K2; the values of K1 and K2 are determined by the switched reluctance motor SRM.
CN201810108036.XA 2018-02-02 2018-02-02 Fault diagnosis method for converter in switch reluctance motor drive and converter Active CN108344918B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810108036.XA CN108344918B (en) 2018-02-02 2018-02-02 Fault diagnosis method for converter in switch reluctance motor drive and converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810108036.XA CN108344918B (en) 2018-02-02 2018-02-02 Fault diagnosis method for converter in switch reluctance motor drive and converter

Publications (2)

Publication Number Publication Date
CN108344918A CN108344918A (en) 2018-07-31
CN108344918B true CN108344918B (en) 2019-12-24

Family

ID=62958886

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810108036.XA Active CN108344918B (en) 2018-02-02 2018-02-02 Fault diagnosis method for converter in switch reluctance motor drive and converter

Country Status (1)

Country Link
CN (1) CN108344918B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110955220B (en) * 2019-11-01 2021-05-11 郑州嘉晨电器有限公司 Self-checking method and system for AC motor controller
CN112968644B (en) * 2021-03-08 2022-11-11 上海交通大学 Permanent magnet synchronous motor parameter online identification method, system, terminal and medium
CN113311353B (en) * 2021-06-29 2022-03-18 华中科技大学 High-frequency injection-based open-circuit fault detection method for bridge arm of three-phase voltage source driver

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI890004A (en) * 1988-08-03 1990-02-04 Siemens Ag FOERFARANDE FOER ATT UNDVIKA VAEXELRIKTARLAOSNING VID EN TILL NAETET AOTERMATANDE STROEMRIKTARE AV EN NAETSIDIG REVERSERINGSSTROEMRIKTARE AV EN SPAENNINGSMELLANKRETS-OMRIKTARE VID DYNAMISK SPAENNINGSSAENKNING O
CN103151783B (en) * 2013-04-09 2014-09-17 马伏军 Three-phase high-voltage cascading mixing power compensator and control method thereof
CN203554341U (en) * 2013-10-14 2014-04-16 杭州锐方科技有限公司 Fault tolerance control system for double three-phase permanent magnet synchronous motor when one phase is in open circuit
CN104122474B (en) * 2014-08-06 2017-03-15 国网上海市电力公司 A kind of intelligent distribution type feeder automation logic testing system
CN104852614B (en) * 2015-05-22 2018-06-01 南京航空航天大学 A kind of three-phase bridge PWM rectifier switching tube open fault fault tolerant control method
CN105356816B (en) * 2015-12-01 2017-09-29 浙江大学 Switched reluctance machines polymorphic type Fault-Tolerant System based on relay network

Also Published As

Publication number Publication date
CN108344918A (en) 2018-07-31

Similar Documents

Publication Publication Date Title
CN108490353B (en) Multiphase permanent magnet synchronous motor drive system method for diagnosing faults
CN108344918B (en) Fault diagnosis method for converter in switch reluctance motor drive and converter
US20100244760A1 (en) System and method for detecting loss of isolation while an ac motor is operating
KR100964035B1 (en) Device for detecting an inverter trouble and method thereof
CN108604876B (en) Motor control device
Estima et al. Fast fault detection, isolation and reconfiguration in fault-tolerant permanent magnet synchronous motor drives
Cheng et al. An open-circuit fault-diagnosis method for inverters based on phase current
Freire et al. A voltage-based approach for open-circuit fault diagnosis in voltage-fed SVM motor drives without extra hardware
CN109039199B (en) Bus current estimation method and system for EPS controller
JP5300349B2 (en) Motor control device and motor ground fault detection method
CN106597190B (en) Grounding detection circuit and method
Refaat et al. ANN-based system for inter-turn stator winding fault tolerant DTC for induction motor drives
Maamouri et al. Fault diagnosis and fault tolerant control of a three-phase VSI supplying sensorless speed controlled induction motor drive
Xiao et al. Magnetic-characteristic-free high-speed position-sensorless control of switched reluctance motor drives with quadrature flux estimators
Ali et al. Simple current sensor fault‐tolerant control strategy for switched reluctance motors in high‐reliability applications
Pal et al. Development of energy efficient scheme for speed sensorless induction motor drive
Suresh et al. Improvement of the accuracy and speed range in sensorless control of switched reluctance motors
Yang et al. Current covariance analysis-based open-circuit fault diagnosis for voltage-source-inverter-fed vector-controlled induction motor drives
CN112710922A (en) Open-circuit fault diagnosis method for double-active-bridge DC-DC converter
Papathanasopoulos et al. Fault identification on hall-effect sensors positioning in brushless DC motor drives via a fuzzy inference system
Ali et al. Diagnosis of power transistors open-and short-circuit faults in SRM drives through current error analysis
Manikandan et al. Hardware-in-loop-based reliability improvement of power converter for critical electrical drive applications
JP7463989B2 (en) Motor Control Device
Papathanasopoulos et al. Evaluation of the Virtual Third Harmonic Back-EMF in Identifying Misaligned Hall-effect Position Sensors in Brushless DC Motor Drives
US11422200B2 (en) Cascade converter and online monitoring method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant