CN109541337A - Frequency converter failure detection method, system, equipment and computer readable storage medium - Google Patents
Frequency converter failure detection method, system, equipment and computer readable storage medium Download PDFInfo
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- CN109541337A CN109541337A CN201811202331.8A CN201811202331A CN109541337A CN 109541337 A CN109541337 A CN 109541337A CN 201811202331 A CN201811202331 A CN 201811202331A CN 109541337 A CN109541337 A CN 109541337A
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Abstract
The embodiment of the invention provides a kind of frequency converter failure detection method, system, equipment and computer readable storage mediums, the described method includes: the three phase inverter bridge into frequency converter inputs first group of hair wave control signal, which is used to make the default phase line in three phase inverter bridge to generate forward current；Detect the first electric current that the default phase line is generated according to first group of hair wave control signal；Three phase inverter bridge into frequency converter inputs second group of hair wave control signal, and second group of hair wave control signal is for making the default phase line generate reverse current；Detect the second electric current that the default phase line is generated according to second group of hair wave control signal；The fault type and abort situation of default phase line are identified according to first electric current and the second electric current.The present invention quickly positions the failures such as frequency converter output phase shortage, switching tube by exporting predetermined control signal to three phase inverter bridge, and according to the output electric current of three phase inverter bridge.
Description
Technical field
The present embodiments relate to frequency converter fields, more specifically to a kind of frequency converter failure detection method, equipment
And computer readable storage medium.
Background technique
Frequency converter has a very wide range of applications in industrial control field.Since the application environment of frequency converter is complicated, it is easy
It breaks down, especially the failure of hardware classes, as there is insulated gate bipolar transistor (Insulated Gate in frequency converter
Bipolar Transistor, IGBT) open circuit or sensor degradation etc., no professional knowledge and tool are difficult to navigate to failure.
In addition, when frequency converter manufactures, it also can be because the stability of buying material be (as there is failure in the current sensor purchased
May) and worker's production stability (such as exist current sensor connecting terminal is wiped instead and three-phase wipes mutually the possibility of wrong position)
And lead to quality problems occur.Therefore frequency converter needs to carry out corresponding fault detection before factory to improve factory product
Quality.But failure goes to position the knowledge and tool that these failures also need profession after occurring, be very for production division
Big challenge.
There are there are also frequency converter the function that failure is judged simply by current sensor, but these products one at present
As only determine whether current failure, and not to the problem carry out classification, producers and user are difficult through the function
Determine specific problem.
As shown in Figure 1, be the schematic diagram that above-mentioned existing frequency converter product carries out breakdown judge, by three phase inverter bridge
Output successively makes the pulse of switching tube U+ and switching tube V- conducting, the pulse that switching tube U+ and switching tube W- is connected, makes to switch
The pulse of pipe V+ and switching tube U- conducting, makes switching tube W+ and switching tube U- at the pulse that switching tube V+ and switching tube W- is connected
The pulse of conducting, the pulse that switching tube W+ and switching tube V- is connected, if there is no electric current in current sampling circuit after open pipe,
Switching tube conducting but currentless failure are obtained, reports three-phase if the information of electric current and setting in current sampling circuit is not inconsistent
The phase sequence of inverter circuit current detecting opens the inconsistent failure detection result of phase sequence with corresponding switching tube.
It can be seen that existing frequency converter failure detection method can only identify in current sampling circuit there is no current and three
The phase sequence of phase inverter circuit current detecting and corresponding switching tube whether open phase sequence consistent, can not identify fault type, and
It is unable to positioning failure and position occurs, be unable to satisfy the requirement of quick positioning failure and restoring scene.
Summary of the invention
Technical problems to be solved of the embodiment of the present invention are, can not for above-mentioned existing frequency converter failure detection method
It identifies fault type, and quickly positioning failure position cannot occur, be unable to satisfy quick positioning failure and restoring scene requirement
Problem provides a kind of frequency converter failure detection method, equipment and computer readable storage medium.
The technical solution that the embodiment of the present invention solves above-mentioned technical problem is to provide a kind of frequency converter failure detection method,
Include:
Three phase inverter bridge into the frequency converter inputs first group of hair wave control signal, first group of hair wave control letter
Number for making default phase line in the three phase inverter bridge generate forward current；
Detect the first electric current that the default phase line is generated according to first group of hair wave control signal；
Three phase inverter bridge into the frequency converter inputs second group of hair wave control signal, second group of hair wave control letter
Number for making the default phase line generate reverse current；
Detect the second electric current that the default phase line is generated according to second group of hair wave control signal；
The fault type and abort situation of the default phase line are identified according to first electric current and second electric current.
Preferably, it is described according to first electric current and second electric current identify the default phase line fault type and
Abort situation includes:
If first electric current and the second electric current are zero, it is identified as the default phase line institute in the three phase inverter bridge
There is output open-phase fault in position；
If first electric current is negative or second electric current is positive, it is identified as in the three phase inverter bridge described
There is installation reverse fault in current sensor corresponding to default phase line；
If any one value is zero in first electric current and second electric current, it is identified as in the three phase inverter bridge
There is switching tube open-circuit fault in the default phase line.
Preferably, if any one value is zero in first electric current and second electric current, it is identified as the three-phase
Switching tube open-circuit fault occur in the default phase line in inverter bridge includes:
If first electric current is zero, second electric current is not zero, it is identified as described pre- in the three phase inverter bridge
If there is open-circuit fault in the bridge arm switch on the bridge pipe of phase line；
If first electric current is not zero, second electric current is zero, it is identified as described pre- in the three phase inverter bridge
If there is open-circuit fault in the bridge arm bridge switch pipe of phase line.
Preferably, the method also includes:
When inputting first group of hair wave control signal to the three phase inverter bridge, in addition detection obtains the three phase inverter bridge
Two phase lines obtain third electric current, the 4th electric current；
Phase line corresponding to first electric current and the third are judged according to first electric current and the third electric current
Current sensor signal line between phase line corresponding to electric current whether wrong plug position；
Phase line corresponding to first electric current and the third are judged according to first electric current and the 4th electric current
Current sensor signal line between phase line corresponding to electric current whether wrong plug position.
Preferably, the method also includes:
When inputting second group of hair wave control signal to the three phase inverter bridge, in addition detection obtains the three phase inverter bridge
Two phase lines obtain the 5th electric current, the 6th electric current；
Phase line and the described 6th corresponding to the 5th electric current is judged according to the value of the 5th electric current and the 6th electric current
Current sensor signal line between phase line corresponding to electric current whether wrong plug position.
Preferably, the three phase inverter bridge into the frequency converter also wraps before inputting first group of hair wave control signal
It includes:
Obtain the current sample digital value of current sampling circuit in the frequency converter；
Judge whether the current sample digital value is greater than preset failure threshold value；
If more than preset failure threshold value, then it is identified as current sensor broken string or the current sampling circuit is abnormal.
The embodiment of the present invention also provides a kind of frequency converter failure detection system, comprising:
First hair wave unit, inputs first group of hair wave control signal, institute for the three phase inverter bridge into the frequency converter
First group of hair wave control signal is stated for making the default phase line in the three phase inverter bridge generate forward current；
First detection unit, first generated for detecting the default phase line according to first group of hair wave control signal
Electric current；
Second hair wave unit, inputs second group of hair wave control signal, institute for the three phase inverter bridge into the frequency converter
Second group of hair wave control signal is stated for making the default phase line generate reverse current；
Second detection unit, second generated for detecting the default phase line according to second group of hair wave control signal
Electric current；
Fault identification unit, for identifying the failure of the default phase line according to first electric current and second electric current
Type and abort situation.
Preferably, the fault identification unit is specifically used for:
If first electric current and the second electric current are zero, it is identified as the default phase line institute in the three phase inverter bridge
There is output open-phase fault in position；
If first electric current is negative or second electric current is positive, it is identified as in the three phase inverter bridge described
There is installation reverse fault in current sensor corresponding to default phase line；
If any one value is zero in first electric current and second electric current, it is identified as in the three phase inverter bridge
There is switching tube open-circuit fault in the default phase line.
The embodiment of the present invention also provides a kind of frequency converter failure detection device, including memory and processor, the storage
The computer program that can be run on the processor is stored in device, the processor is realized when executing the computer program
The step of method as described above.
The embodiment of the present invention also provides a kind of computer readable storage medium, and computer journey is stored on the storage medium
Sequence, when the computer program is executed by processor, the step of realizing method as described above.
Frequency converter failure detection method of the present invention, system, the embodiment of equipment and computer readable storage medium, pass through to
Three phase inverter bridge export predetermined control signal, and according to the output electric current of three phase inverter bridge quickly position frequency converter output phase shortage,
The failures such as switching tube.
The embodiment of the present invention can also be achieved current sensor broken string, current sensor is installed between reversed, three-phase sensor
The failures such as signal line position wrong plug, frequency converter debugged in using the function can effective positioning failure, greatly shorten tune
Try the period.
Detailed description of the invention
Fig. 1 is the schematic illustration of existing frequency converter failure judgement；
Fig. 2 is the flow diagram of frequency converter failure detection method of the embodiment of the present invention；
Fig. 3 is the schematic illustration of frequency converter failure detection method of the embodiment of the present invention；
Fig. 4 is the flow diagram of another embodiment of the present invention frequency converter failure detection method；
Fig. 5 is the schematic diagram of frequency converter failure detection device of the embodiment of the present invention；
Fig. 6 is the schematic diagram of frequency converter failure detection system of the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Fig. 2, being the flow diagram of frequency converter failure detection method of the embodiment of the present invention, this method can quickly determine
Position frequency converter failure simultaneously obtains fault type.Frequency converter failure detection method in the present embodiment can be by the master controller of frequency converter
It executes, and including following
Step S11: the three phase inverter bridge into frequency converter inputs first group of hair wave control signal, first group of hair wave control
Signal is used to make the default phase line in three phase inverter bridge to generate forward current (i.e. dextrad in Fig. 3).Above-mentioned default phase line can be with
For U phase line, V phase line or W phase line.
In conjunction with Fig. 3, when default phase line is U phase line, the corresponding bridge arm of U phase line is U phase bridge arm in three phase inverter bridge, and should
U phase bridge arm includes switch on the bridge pipe U+, bridge switch pipe U-.Other two phase line distinguishes V phase line and W phase line, and three-phase inversion
The corresponding bridge arm of V phase line is V phase bridge arm in bridge, and the V phase bridge arm includes switch on the bridge pipe V+, bridge switch pipe V-；Three contraries
The corresponding bridge arm of W phase line is W phase bridge arm in change bridge, and the W phase bridge arm includes switch on the bridge pipe W+, bridge switch pipe W-.
For example, above-mentioned first group of hair wave control signal, which specifically includes, makes the upper of U phase bridge arm when default phase line is U phase line
The first conduction pulses that the bridge switch pipe W- of bridge switch pipe V- and W the phase bridge arm of bridge switch pipe U+, V phase bridge arm is respectively turned on
(the switch on the bridge pipe W+ of switch on the bridge pipe V+ and W the phase bridge arm of bridge switch pipe U-, V phase bridge arm of U phase bridge arm is each turned off)；
Correspondingly, second group of hair wave control signal then includes the switch on the bridge pipe V+ for making bridge switch pipe U-, V phase bridge arm of U phase bridge arm
And the second conduction pulses that the bridge switch pipe W- of W phase bridge arm is respectively turned on (switch on the bridge pipe U+, V phase bridge arm of U phase bridge arm
The switch on the bridge pipe W+ of bridge switch pipe V- and W phase bridge arm is each turned off).
IGBT (Insulated Gate Bipolar specifically can be used in above-mentioned switching tube U+, U-, V+, U-, W+, W-
Transistor, insulated gate bipolar transistor) or MOSFET (Metal-Oxide Semiconductor field effect transistor, Metal-
Oxide-Semiconductor Field-Effect Transistor) etc..
Step S12: the first electric current that default phase line is generated according to first group of hair wave control signal is detected.Above-mentioned default phase line
In the first electric current can pass through sensor H1 and current sampling circuit sampling obtain.
In above-mentioned steps S11, the pulsewidth of first group of hair wave control signal can be made to gradually increase, while step S12 is examined
The first electric current is surveyed, if the pulsewidth of first group of hair wave control signal is greater than the fault threshold of setting, the first electric current still very little then may be used
Think that the bridge arm for presetting phase line position in three phase inverter bridge cannot flow through electric current, above-mentioned first electric current can be considered as zero.
When the first electric current is zero, there are two kinds of possibility, i.e., the switch on the bridge pipe that phase line position is preset in three phase inverter bridge is opened
Preset phase line position in the three phase inverter bridge of road failure or frequency converter and open-phase fault occur, and need to by step S13,
S14 is further identified.
Step S13: the three phase inverter bridge into frequency converter inputs second group of hair wave control signal, second group of hair wave control
Signal is for making above-mentioned default phase line generate reverse current (i.e. left-hand in Fig. 3).
Step S14: the second electric current that default phase line is generated according to second group of hair wave control signal is detected.Above-mentioned default phase line
In the second electric current equally can pass through sensor H1 and current sampling circuit sampling obtain.
In above-mentioned steps S13, equally the pulsewidth of second group of hair wave control signal can also be made to gradually increase, while step
S14 detects the second electric current, if the pulsewidth of second group of hair wave control signal is greater than the fault threshold of setting, the second electric current is still very
It is small, then it, can be by above-mentioned second electric current it is believed that the bridge arm for presetting phase line position in three phase inverter bridge cannot flow through electric current
It is considered as zero.
Step S15: the abort situation and fault type of default phase line are identified according to the first electric current and the second electric current.
Specifically, in this step, it if the first electric current and the second electric current are all zero, is identified as presetting in three phase inverter bridge
There is output open-phase fault in phase line position；If the first electric current is negative (i.e. the first electric current is flowed by the left-hand of Fig. 3), Huo Zhe
Two electric currents are positive (i.e. the second electric current is flowed by the dextrad of Fig. 3), then are identified as presetting electricity corresponding to phase line in three phase inverter bridge
There is installation reverse fault in flow sensor；If any one value is zero in the first electric current and second electric current, it is identified as three
It is preset in phase line in phase inverter bridge and switching tube open-circuit fault occurs.
Particularly, it if the first electric current is that the zero, second electric current is not zero, is identified as presetting the bridge of phase line in three phase inverter bridge
There is open-circuit fault in arm switch on the bridge pipe；If the first electric current is not zero, the second electric current is zero, it is identified as in three phase inverter bridge pre-
If there is open-circuit fault in the bridge arm bridge switch pipe of phase line.
As shown in figure 4, in another embodiment of frequency converter failure detection method of the present invention, comprising:
Step S41: first group of hair wave control signal is exported to the three phase inverter bridge of frequency converter, and detects and obtains the three-phase
4th electric current of the first electric current of the first phase line of inverter bridge, the third electric current of the second phase line and third phase line.Actually answering
In, the first phase line can be any of U phase line, V phase line, W phase line.
Illustrate so that the first phase line is U phase line, the second phase line is V phase line, third phase line is W phase line as an example below.Above-mentioned
One group of hair wave control signal specifically includes bridge switch pipe V- and W the phase bridge for making switch on the bridge pipe U+, V phase bridge arm of U phase bridge arm
The first conduction pulses that the bridge switch pipe W- of arm is respectively turned on (open by the upper bridge of bridge switch pipe U-, V phase bridge arm of U phase bridge arm
The switch on the bridge pipe W+ for closing pipe V+ and W phase bridge arm is each turned off).
Step S42: second group of hair wave control signal is exported to the three phase inverter bridge of frequency converter, and detects and obtains the three-phase
The second electric current, the 5th electric current of the second phase line and the 6th electric current of third phase line of first phase line of inverter bridge.This second group
Sending out wave control signal includes the lower bridge for making switch on the bridge pipe V+ and W the phase bridge arm of bridge switch pipe U-, V phase bridge arm of U phase bridge arm
The second conduction pulses (bridge switch pipe V- and W of switch on the bridge pipe U+, V phase bridge arm of U phase bridge arm that switching tube W- is respectively turned on
The switch on the bridge pipe W+ of phase bridge arm is each turned off).
Step S43: second group of hair wave control signal is exported to the three-phase bridge arm of three phase inverter bridge, and detects and obtains three contraries
Become the 7th electric current, the 8th electric current of the second phase line and the 9th electric current of third phase line of the first phase line of bridge.Above-mentioned third group
Sending out wave control signal includes the upper bridge for making bridge switch pipe V- and W the phase bridge arm of bridge switch pipe U-, V phase bridge arm of U phase bridge arm
Third conduction pulses (bridge switch the pipe V+ and W of switch on the bridge pipe U+, V phase bridge arm of U phase bridge arm that switching tube W+ is respectively turned on
The switch on the bridge pipe W- of phase bridge arm is respectively turned off).
Step S44: according to the first electric current, the second electric current, third electric current, the 4th electric current, the 5th electric current, the 6th electric current,
Seven electric currents, the 8th electric current, the 9th electric current carry out breakdown judge.
Similarly, in this step, if the first electric current and the second electric current (or the 7th electric current) are all zero, it is identified as first
Mutually output phase shortage；If the first electric current is the zero, second electric current, (or the 7th electric current) is not zero, and is identified as the U phase of three phase inverter bridge
The switch on the bridge pipe U+ of bridge arm opens a way；If the first electric current is not zero, the second electric current (or the 7th electric current) is zero, it is identified as three-phase
The bridge switch pipe U- of the U phase bridge arm of inverter bridge opens a way.Similarly, if the 5th electric current and third electric current (or the 8th electric current) are all
Zero, then the V phase for being identified as three phase inverter bridge exports phase shortage；If the 5th electric current is zero, third electric current (or the 8th electric current) is not zero,
Then it is identified as the switch on the bridge pipe V+ open circuit of V phase bridge arm；If the 5th electric current is not zero, third electric current (or the 8th electric current) is zero,
Then it is identified as the bridge switch pipe V- open circuit of the V phase bridge arm of three phase inverter bridge.9th electric current and the 4th electric current (or the 6th electric current)
It is all zero, then the W phase for being identified as three phase inverter bridge exports phase shortage；If the 9th electric current be the zero, the 4th electric current (or the 6th electric current) no
It is zero, then is identified as the switch on the bridge pipe W+ open circuit of the W phase bridge arm of three phase inverter bridge；If the 9th electric current is not zero, the 4th electric current
(or the 6th electric current) is zero, then is identified as the bridge switch pipe W- open circuit of the W phase bridge arm of three phase inverter bridge.
It in this step, can also be after obtaining the first electric current and third electric current, according to the first electric current and third electric current
Value judges whether the first phase line, sensor H1, H2 in the second phase line are reversed.Specifically, under normal circumstances, first electric current
Absolute value is twice of the absolute value of third electric current, if but the absolute value of third electric current is twice of absolute value of the first electric current,
Then it is identified as sensor H1, H2 reversed (i.e. sensor H1 has been connected to the second phase line, and sensor H2 has been connected to the first phase line).It is similar
Ground can judge whether the first phase line, the sensor in third phase line are reversed, i.e., according to the value of the first electric current and the 4th electric current
When the absolute value of four electric currents is twice of the absolute value of the first electric current, then being identified as sensor H1, H3, reversed (i.e. sensor H1 connects
Third phase line is arrived, sensor H3 has been connected to the first phase line).Also the second phase can be judged according to the value of the 5th electric current and the 6th electric current
Whether sensor H2, H3 on line, third phase line are reversed, i.e., in two that the absolute value of the 6th electric current is the absolute value of the 5th electric current
Times when, then being identified as sensor H2, H3, reversed (i.e. sensor H2 has been connected to third phase line, and sensor H3 has been connected to the second phase
Line).
Above-mentioned steps S41, step S42, the execution sequence of step S43 are interchangeable, and the fault location in step S44 can be
Executed after obtaining corresponding electric current, without etc. all electric currents all detect acquisition after execute.
Above-mentioned steps S41, step S42, step S43 execute before, can first pass through detection circuit judge sensor H1,
Whether H2, H3 and current sampling circuit are abnormal, and above-mentioned detection circuit connects the current sampling circuit.
Above-mentioned frequency converter failure detection method can quickly be positioned frequency converter output and be lacked by three groups of hair wave control signals
Phase, switch tube open circuit, current sensor install reversed, signal line position wrong plug between three-phase sensor failure, in product tune
In trying using the function can effective positioning failure, greatly shorten debugging cycle.
In addition, all kinds of fault location of frequency converter can be also realized by six groups of hair wave control signals, wherein first group of hair wave
Controlling signal includes the conduction pulses for being respectively turned on the switch on the bridge pipe U+ of the first bridge arm, the bridge switch pipe V- of the second bridge arm
(other each switching tubes disconnect)；Second group of hair wave control signal includes bridge switch pipe U-, the second bridge arm for making the first bridge arm
The conduction pulses (other each switching tubes disconnect) that are respectively turned on of switch on the bridge pipe V+；Third group hair wave control signal includes making
Conduction pulses (other each switches that the switch on the bridge pipe U+ of first bridge arm, the bridge switch pipe W- of third bridge arm are respectively turned on
Pipe disconnects)；4th group of hair wave control signal includes the switch on the bridge pipe V+ for making the second bridge arm, the bridge switch pipe W- of third bridge arm
The conduction pulses being respectively turned on (other each switching tubes disconnect)；5th group of hair wave control signal includes the lower bridge for making the first bridge arm
The conduction pulses (other each switching tubes disconnect) that are respectively turned on of switch on the bridge pipe W+ of switching tube U-, third bridge arm；6th group
Sending out wave control signal includes the conducting for being respectively turned on the bridge switch pipe V- of the second bridge arm, the switch on the bridge pipe W+ of third bridge arm
Pulse (other each switching tubes disconnect).Although all breakdown judges also may be implemented in the program, hair wave type is more, time-consuming
It is relatively long.
As shown in figure 5, the embodiment of the present invention also provides a kind of frequency converter failure detection device, which can be integrated into frequency conversion
Device, and the sensor and current sample of the electric current of three-phase output line for detecting three phase inverter bridge are also integrated in the frequency converter
Circuit.The frequency converter failure detection device of the present embodiment includes memory 51 and processor 52, and is stored in memory 51
The computer program that can be run on the processor 52, processor 52 realize the step of method as described above when executing computer program
Suddenly.The equipment of the embodiment of the present invention and above-mentioned Fig. 2, Fig. 4 detection method belong to same design, and specific implementation process is shown in pair in detail
The embodiment of the method answered, and the technical characteristic in embodiment of the method is corresponding applicable in this apparatus embodiments, it is no longer superfluous here
It states.It will appreciated by the skilled person that whole or certain steps in the present embodiment disclosed method, can be carried out
For software, firmware, hardware and its combination appropriate.
The embodiment of the present invention also provides a kind of storage medium, and computer program, and the meter are stored on the storage medium
When calculation machine program is executed by processor, the step of realizing method as described above.The storage medium of the embodiment of the present invention and above-mentioned change
Frequency device fault detection method belongs to same design, and specific implementation process is shown in corresponding embodiment of the method in detail, and method is implemented
Technical characteristic in example is corresponding applicable in the present embodiment, and which is not described herein again.It will appreciated by the skilled person that
Whole or certain steps in the present embodiment disclosed method may be implemented as software, firmware, hardware and its appropriate group
It closes.
As shown in fig. 6, the embodiment of the present invention also provides a kind of frequency converter failure detection system, which includes: the first hair
Wave unit 61, first detection unit 62, second send out wave unit 63, second detection unit 64 and fault identification unit 65, above-mentioned
First hair wave unit 61, first detection unit 62, second send out wave unit 63, second detection unit 64 and fault identification unit 65
It specifically can be respectively by corresponding combination of hardware software realization.
First hair wave unit 61 inputs first group of hair wave control signal for the three phase inverter bridge into frequency converter, and described the
One group of hair wave control signal is used to make the default phase line in the three phase inverter bridge to generate forward current.Above-mentioned default phase line can be with
Any of U phase line, V phase line and W phase line.
First detection unit 62 is used to detect the default phase line is generated according to first group of hair wave control signal the
One electric current.The first electric current can be obtained by sensor H1 and current sampling circuit sampling in above-mentioned default phase line, and the present embodiment
In forward current refer to the value of the first electric current is positive, i.e. in Fig. 3 dextrad.
Second hair wave unit 63 inputs second group of hair wave control signal, institute for the three phase inverter bridge into the frequency converter
Second group of hair wave control signal is stated for making the default phase line generate reverse current, and above-mentioned reverse current refers to the second electric current
Value be negative, i.e. left-hand in Fig. 3.
Second detection unit 64 is used to detect the default phase line is generated according to second group of hair wave control signal the
Two electric currents.The second electric current can be obtained by sensor H1 and current sampling circuit sampling in above-mentioned default phase line.
Fault identification unit 65 is used to identify the failure classes of the default phase line according to first electric current and the second electric current
Type and abort situation.
Preferably, the fault identification unit is specifically used for:
If first electric current and the second electric current are zero, it is identified as the default phase line institute in the three phase inverter bridge
There is output open-phase fault in position；
If first electric current is negative or second electric current is positive, it is identified as in the three phase inverter bridge described
There is installation reverse fault in current sensor corresponding to default phase line；
If any one value is zero in first electric current and second electric current, it is identified as in the three phase inverter bridge
There is switching tube open-circuit fault in the default phase line.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (10)
1. a kind of frequency converter failure detection method characterized by comprising
Three phase inverter bridge into the frequency converter inputs first group of hair wave control signal, and first group of hair wave control signal is used
In making default phase line in the three phase inverter bridge generate forward current；
Detect the first electric current that the default phase line is generated according to first group of hair wave control signal；
Three phase inverter bridge into the frequency converter inputs second group of hair wave control signal, and second group of hair wave control signal is used
In making the default phase line generate reverse current；
Detect the second electric current that the default phase line is generated according to second group of hair wave control signal；
The fault type and abort situation of the default phase line are identified according to first electric current and second electric current.
2. frequency converter failure detection method according to claim 1, which is characterized in that it is described according to first electric current and
Second electric current identifies the fault type of the default phase line and abort situation includes:
If first electric current and the second electric current are zero, it is in place to be identified as the default phase line institute in the three phase inverter bridge
Set appearance output open-phase fault；
If first electric current is negative or second electric current is positive, it is identified as described default in the three phase inverter bridge
There is installation reverse fault in current sensor corresponding to phase line；
If any one value is zero in first electric current and second electric current, it is identified as in the three phase inverter bridge described
There is switching tube open-circuit fault in default phase line.
3. frequency converter failure detection method as claimed in claim 2, which is characterized in that if first electric current and described second
Any one value is zero in electric current, then is identified as switching tube open-circuit fault occur in the default phase line in the three phase inverter bridge
Include:
If first electric current is zero, second electric current is not zero, it is identified as the default phase in the three phase inverter bridge
There is open-circuit fault in the bridge arm switch on the bridge pipe of line；
If first electric current is not zero, second electric current is zero, it is identified as the default phase in the three phase inverter bridge
There is open-circuit fault in the bridge arm bridge switch pipe of line.
4. frequency converter failure detection method according to claim 1, which is characterized in that the method also includes:
When inputting first group of hair wave control signal to the three phase inverter bridge, detection obtain the three phase inverter bridge other two
Phase line obtains third electric current, the 4th electric current；
Phase line corresponding to first electric current and the third electric current are judged according to first electric current and the third electric current
Current sensor signal line between corresponding phase line whether wrong plug position；
Phase line corresponding to first electric current and the third electric current are judged according to first electric current and the 4th electric current
Current sensor signal line between corresponding phase line whether wrong plug position.
5. frequency converter failure detection method according to claim 4, which is characterized in that the method also includes:
When inputting second group of hair wave control signal to the three phase inverter bridge, detection obtain the three phase inverter bridge other two
Phase line obtains the 5th electric current, the 6th electric current；
Phase line corresponding to the 5th electric current and the 6th electric current are judged according to the value of the 5th electric current and the 6th electric current
Current sensor signal line between corresponding phase line whether wrong plug position.
6. frequency converter failure detection method as described in claim 1, which is characterized in that the three-phase into the frequency converter
Inverter bridge inputs before first group of hair wave control signal further include:
Obtain the current sample digital value of current sampling circuit in the frequency converter；
Judge whether the current sample digital value is greater than preset failure threshold value；
If more than preset failure threshold value, then it is identified as current sensor broken string or the current sampling circuit is abnormal.
7. a kind of frequency converter failure detection system characterized by comprising
First hair wave unit inputs first group of hair wave control signal for the three phase inverter bridge into the frequency converter, and described the
One group of hair wave control signal is used to make the default phase line in the three phase inverter bridge to generate forward current；
First detection unit generates the first electricity that wave control signal generates according to described first group for detecting the default phase line
Stream；
Second hair wave unit inputs second group of hair wave control signal for the three phase inverter bridge into the frequency converter, and described the
Two groups of hair wave control signals are for making the default phase line generate reverse current；
Second detection unit generates the second electricity that wave control signal generates according to described second group for detecting the default phase line
Stream；
Fault identification unit, for identifying the fault type of the default phase line according to first electric current and second electric current
And abort situation.
8. frequency converter failure detection system according to claim 7, which is characterized in that the fault identification unit is specifically used
In:
If first electric current and the second electric current are zero, it is in place to be identified as the default phase line institute in the three phase inverter bridge
Set appearance output open-phase fault；
If first electric current is negative or second electric current is positive, it is identified as described default in the three phase inverter bridge
There is installation reverse fault in current sensor corresponding to phase line；
If any one value is zero in first electric current and second electric current, it is identified as in the three phase inverter bridge described
There is switching tube open-circuit fault in default phase line.
9. a kind of frequency converter failure detection device, which is characterized in that including memory and processor, be stored in the memory
The computer program that can be run on the processor, which is characterized in that the processor executes real when the computer program
Now such as the step of any one of claims 1 to 6 the method.
10. a kind of computer readable storage medium, computer program is stored on the storage medium, which is characterized in that described
When computer program is executed by processor, realize such as the step of any one of claims 1 to 6 the method.
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