CN109884449A - Motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method - Google Patents
Motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method Download PDFInfo
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- CN109884449A CN109884449A CN201910140071.4A CN201910140071A CN109884449A CN 109884449 A CN109884449 A CN 109884449A CN 201910140071 A CN201910140071 A CN 201910140071A CN 109884449 A CN109884449 A CN 109884449A
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Abstract
The invention discloses a kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method, steps 1, the size L for obtaining sampling number in sliding window；Step 2 calculates the covariance value (D of three-phase current between any two by the size L of sampling numberab,Dbc,Dca)；Step 3 calculates Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaTo complete the diagnosis and positioning of failure.The present invention can real-time detection the case where going out any three-phase inversion system list bridge arm open-circuit fault, and failure bridge arm position can be accurately positioned, the present invention simultaneously has directive significance to the on-line checking of multi-level inverse conversion system bridge arm open-circuit fault.
Description
Technical field
The invention belongs to online measuring technique fields, and in particular to motor driven systems three-phase inverter bridge arm open-circuit fault
Real-time detection method.
Background technique
Currently, the device that alternating current generator is converted as electric energy and mechanical energy, in aerospace, military affairs, industry, locomotive traction
The fields such as system and ship are widely used, and the trend for replacing direct current generator completely is presented.Inverter is as alternating current
Core component in machine drive system is the weak link for being easiest to break down in drive system, wherein power tube switching tube
Open-circuit fault caused by being opened, turned off as high frequency is especially pronounced, directly affects the normal operation of motor driven systems.For inverse
Become the method that the open-circuit fault of device bridge arm proposes real-time effective detection, positioning and isolation, provides real-time effective information to rear
Continuous faults-tolerant control strategy has important engineering application value to the reliability for improving motor driven systems.
It is largely based on electric current about inverter leg open-circuit fault real-time detection method in current published document
Opened loop control motor driven systems, and it is seldom to the research of vector controlled drive system, especially failure is done with stator current
The method of diagnosis, and these methods are mostly the features based on current signal to detect failure.But since current closed-loop is added
The reason of adjuster, current characteristics in vector controlled drive system are more complicated than open current loop control motor driven systems
It is more.
Summary of the invention
It is an object of the invention to overcome disadvantages described above, motor driven systems three-phase inverter bridge arm open circuit is provided
Failure real-time detection method.
To achieve the above object, concrete scheme of the invention is as follows: a kind of motor driven systems three-phase inverter bridge arm is opened
Road failure real-time detection method, step 1, the size L for obtaining sampling number in sliding window；
Step 2 calculates the covariance value (D of three-phase current between any two by the size L of sampling numberab,Dbc,Dca)；
Step 3 calculates Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaTo complete the diagnosis and positioning of failure.
Wherein, the size L of sampling number in sliding window is calculated according to the following formula:
Np is the number of pole-pairs of motor, TsFor the sampling period of control system, v is motor speed.
Wherein, real-time online seeks the covariance value (D of three-phase current between any two according to the following formulaab,Dbc,Dca):
Wherein Ea,Eb,EcTo seek mode as follows:
Wherein,
Calculate Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaCalculation is as follows:
The diagnosis and positioning of failure are completed by following modes:
k1For breakdown judge threshold value, k1Value range be 0-1.
Wherein, k1Value be 0.7.
The invention has the benefit that the present invention can real-time detection go out any three-phase inversion system list bridge arm open-circuit fault
The case where, and failure bridge arm position can be accurately positioned, the present invention and to the online of multi-level inverse conversion system bridge arm open-circuit fault
Detection has directive significance, and has following specific effect:
(1) at low cost, the present invention does not need additional voltage and passes suitable for any system using vector control strategy
Sensor；Open-circuit fault of power tubes of inverter in three-phase motor open current loop control system is also applied for diagnose.
(2) detection accuracy is high, and speed is fast, and real-time is high, and the present invention being capable of any bridge in accurate detection frequency converter in real time
Arm open-circuit fault and secondary failure.
(3) robustness is good, strong antijamming capability, and the dynamic processes such as electric motor starting, speed change, impact or anticlimax load will not
Negative influence is generated to fault diagnosis result of the invention；And the program is insensitive to motor inner parameter, noise resisting ability is strong.
(4) it realizes simply, the present invention can be used as a subprogram and be embedded into control program, not influence without modification
Control program.
(5) scheme is simple, does not need excessive calculating, greatly reduces the computation complexity of system.
Detailed description of the invention
Fig. 1 is for the topological structure of the motor driven systems three-phase inverter of tape jam diagnostic module in the present invention.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, is not reality of the invention
It applies range and is confined to this.
With reference first to Fig. 1, for the topology knot of the motor driven systems three-phase inverter of tape jam diagnostic module in the present invention
Structure；System is by power tube SA1,SA2,SB1,SB2,SC1,SC2, corresponding sustained diodeA1,DA2,DB1,DB2,DC1,DC2, three-phase alternating current
Asynchronous machine IM, filter capacitor C1, C2 composition, UdFor DC bus-bar voltage, v is the output revolving speed of asynchronous machine, ia,ib,icFor
Regulation for Stator Current of Induction Motors generates driving signal control power tube and opens shutdown, in this fault diagnosis algorithm, ia,ib,ic, v is
The variable for needing to acquire in real time.
A kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method described in the present embodiment,
Step 1, the size L for obtaining sampling number in sliding window；
Step 2 calculates the covariance value (D of three-phase current between any two by the size L of sampling numberab,Dbc,Dca)；
Step 3 calculates Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaTo complete the diagnosis and positioning of failure.
In specific steps 1, the size L of sampling number in sliding window is calculated according to the following formula:
Np is the number of pole-pairs of motor, TsFor the sampling period of control system, v is motor speed, wherein v is passed according to speed
Sensor measurement gained.
In specific steps 2, real-time online seeks the covariance value (D of three-phase current between any two according to the following formulaab,
Dbc,Dca):
Wherein Ea,Eb,EcTo seek mode as follows:
In specific steps 3,
Calculate Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaCalculation is as follows:
The diagnosis and positioning of failure are completed by following modes:
k1For breakdown judge threshold value, k1Value range be 0-1；When value is smaller, fault diagnosis speed is faster, but same
When its fault diagnosis robustness it is accordingly poorer, anti-interference ability is weaker, in the present inspection method, value 0.7, have it is good
The high anti-interference ability of good fault detection speed.In conclusion the performance of three-phase inverter bridge arm open-circuit fault is such as 1 institute of table
Show:
Table 1
The present invention can real-time detection the case where going out any three-phase inversion system list bridge arm open-circuit fault, and can accurately determine
Position failure bridge arm position, the present invention simultaneously have directive significance to the on-line checking of multi-level inverse conversion system bridge arm open-circuit fault, and
With following specific effect:
1, at low cost, the present invention does not need additional voltage and passes suitable for any system using vector control strategy
Sensor；Open-circuit fault of power tubes of inverter in three-phase motor open current loop control system is also applied for diagnose.
2, detection accuracy is high, and speed is fast, and real-time is high, and the present invention being capable of any bridge arm in accurate detection frequency converter in real time
Open-circuit fault and secondary failure.
3, robustness is good, strong antijamming capability, and the dynamic processes such as electric motor starting, speed change, impact or anticlimax load will not
Negative influence is generated to fault diagnosis result of the invention；And the program is insensitive to motor inner parameter, noise resisting ability is strong.
4, it realizes simply, the present invention can be used as a subprogram and be embedded into control program, not influence without modification
Control program.
5, scheme is simple, does not need excessive calculating, greatly reduces the computation complexity of system.
The above is only a preferred embodiment of the invention, therefore all according to structure described in present patent application range
It makes, the equivalent change or modification that feature and principle are done, in the protection scope of present patent application.
Claims (5)
1. a kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method, it is characterised in that: step 1,
Out in sliding window sampling number size L；
Step 2 calculates the covariance value (D of three-phase current between any two by the size L of sampling numberab,Dbc,Dca)；
Step 3 calculates Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaTo complete the diagnosis and positioning of failure.
2. a kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method according to claim 1,
It is characterized by:
The size L of sampling number in sliding window is calculated according to the following formula:
Np is the number of pole-pairs of motor, TsFor the sampling period of control system, v is motor speed.
3. a kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method according to claim 2,
It is characterized by: real-time online seeks the covariance value (D of three-phase current between any two according to the following formulaab,Dbc,Dca):
Wherein Ea,Eb,EcTo seek mode as follows:
4. a kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method according to claim 3,
It is characterized by:
Calculate Dab,Dbc,DcaShared absolute percent Kab,Kbc,KcaCalculation is as follows:
The diagnosis and positioning of failure are completed by following modes:
k1For breakdown judge threshold value, k1Value range be 0-1.
5. a kind of motor driven systems three-phase inverter bridge arm open-circuit fault real-time detection method according to claim 4,
It is characterized by: k1Value be 0.7.
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| CN111413646A (en) * | 2020-04-10 | 2020-07-14 | 华中科技大学 | Real-time detection method for open-circuit fault of bridge arm of three-phase voltage source inverter |
| CN113311353A (en) * | 2021-06-29 | 2021-08-27 | 华中科技大学 | High-frequency injection-based open-circuit fault detection method for bridge arm of three-phase voltage source driver |
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