CN109541337B - Frequency converter fault detection method, system, equipment and computer readable storage medium - Google Patents
Frequency converter fault detection method, system, equipment and computer readable storage medium Download PDFInfo
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- CN109541337B CN109541337B CN201811202331.8A CN201811202331A CN109541337B CN 109541337 B CN109541337 B CN 109541337B CN 201811202331 A CN201811202331 A CN 201811202331A CN 109541337 B CN109541337 B CN 109541337B
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Abstract
The embodiment of the invention provides a method, a system and equipment for detecting faults of a frequency converter and a computer readable storage medium, wherein the method comprises the following steps: inputting a first group of wave-emitting control signals to a three-phase inverter bridge in a frequency converter, wherein the first group of wave-emitting control signals are used for enabling a preset phase line in the three-phase inverter bridge to generate a forward current; detecting a first current generated by the preset phase line according to the first group of wave-sending control signals; inputting a second group of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, wherein the second group of wave-emitting control signals are used for enabling the preset phase line to generate reverse current; detecting a second current generated by the preset phase line according to the second group of wave-emitting control signals; and identifying the fault type and the fault position of a preset phase line according to the first current and the second current. According to the invention, the faults of phase loss, switching tubes and the like output by the frequency converter are quickly positioned by outputting the preset control signal to the three-phase inverter bridge and according to the output current of the three-phase inverter bridge.
Description
Technical Field
The embodiment of the invention relates to the field of frequency converters, in particular to a method and equipment for detecting faults of a frequency converter and a computer-readable storage medium.
Background
Frequency converters have very wide application in the field of industrial control. Due to the complex application environment of the frequency converter, faults are easy to occur, especially faults of hardware, such as open circuit of Insulated Gate Bipolar Transistors (IGBTs) or damage of sensors in the frequency converter, and the faults are difficult to locate without professional knowledge and tools.
In addition, when the frequency converter is manufactured, quality problems can also occur due to the stability of purchased materials (for example, the possibility of failure of purchased current sensors) and the stability of production of workers (for example, the possibility of reverse wiping of terminals of the current sensors and the possibility of mutual position error of three phases). Therefore, before the frequency converter leaves the factory, corresponding fault detection is required to improve the quality of the product leaving the factory. However, locating faults after they occur also requires professional knowledge and tools, which is a great challenge for the production sector.
At present, some frequency converters have a simple function of judging faults through a current sensor, but the products generally only judge whether the faults exist or not, but do not classify the problems, and the specific problems are difficult to determine through the function by production personnel and users.
As shown in fig. 1, the schematic diagram of the above-mentioned conventional frequency converter product for fault determination is that a pulse for sequentially turning on the switching tube U + and the switching tube V-, a pulse for turning on the switching tube U + and the switching tube W-, a pulse for turning on the switching tube V + and the switching tube U-, a pulse for turning on the switching tube V + and the switching tube W-, a pulse for turning on the switching tube W + and the switching tube W-, and a pulse for turning on the switching tube W + and the switching tube V-are output to the three-phase inverter bridge, and after the switching, if there is no current in the current sampling loop, a fault that the switching tube is on but there is no current is obtained, and if the current in the current sampling loop does not match the set information, a fault detection result that the phase sequence of the current detection of the three-phase inverter circuit does not match the on phase sequence of the corresponding switching tube is reported.
Therefore, the existing frequency converter fault detection method can only identify whether current exists in the current sampling loop or not and whether the phase sequence detected by the current of the three-phase inverter circuit is consistent with the open phase sequence of the corresponding switch tube or not, cannot identify the fault type, cannot locate the fault occurrence position, and cannot meet the requirements of quickly locating the fault and recovering the site.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method, an apparatus, and a computer-readable storage medium for detecting a fault of a frequency converter, which are directed to the problems that the existing method for detecting a fault of a frequency converter cannot identify a fault type, cannot quickly locate a fault occurrence position, and cannot meet the requirements of quickly locating a fault and recovering a field.
The technical solution for solving the above technical problems in the embodiments of the present invention is to provide a method for detecting a fault of a frequency converter, including:
inputting a first group of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, wherein the first group of wave-emitting control signals are used for enabling a preset phase line in the three-phase inverter bridge to generate a forward current;
detecting a first current generated by the preset phase line according to the first group of wave-sending control signals;
inputting a second group of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, wherein the second group of wave-emitting control signals are used for enabling the preset phase line to generate reverse current;
detecting a second current generated by the preset phase line according to the second group of wave-emitting control signals;
and identifying the fault type and the fault position of the preset phase line according to the first current and the second current.
Preferably, the identifying the fault type and the fault location of the preset phase line according to the first current and the second current comprises:
if the first current and the second current are both zero, identifying that an output open-phase fault occurs at the position of the preset phase line in the three-phase inverter bridge;
if the first current is negative or the second current is positive, identifying that a reverse fault occurs in installation of a current sensor corresponding to the preset phase line in the three-phase inverter bridge;
and if any value of the first current and the second current is zero, identifying that an open-circuit fault of a switching tube occurs in the preset phase line in the three-phase inverter bridge.
Preferably, if any one of the first current and the second current is zero, identifying that an open-circuit fault of a switching tube occurs in the preset phase line in the three-phase inverter bridge includes:
if the first current is zero and the second current is not zero, identifying that an open-circuit fault occurs in a bridge arm upper bridge switching tube of the preset phase line in the three-phase inverter bridge;
and if the first current is not zero and the second current is zero, identifying that an open-circuit fault occurs in a bridge arm lower bridge switching tube of the preset phase line in the three-phase inverter bridge.
Preferably, the method further comprises:
when a first group of wave-sending control signals are input into the three-phase inverter bridge, detecting and obtaining the other two phase lines of the three-phase inverter bridge to obtain a third current and a fourth current;
judging whether a current sensor signal wire between a phase line corresponding to the first current and a phase line corresponding to the third current is inserted at a wrong position or not according to the first current and the third current;
and judging whether the current sensor signal wire between the phase line corresponding to the first current and the phase line corresponding to the fourth current is inserted at a wrong position or not according to the first current and the fourth current.
Preferably, the method further comprises:
when a second group of wave-emitting control signals are input into the three-phase inverter bridge, detecting and obtaining the other two phase lines of the three-phase inverter bridge to obtain a fifth current and a sixth current;
and judging whether the current sensor signal wire between the phase line corresponding to the fifth current and the phase line corresponding to the sixth current is inserted at a wrong position or not according to the values of the fifth current and the sixth current.
Preferably, before inputting the first set of wave-sending control signals to the three-phase inverter bridge in the frequency converter, the method further includes:
acquiring a current sampling digital value of a current sampling loop in the frequency converter;
judging whether the current sampling digital value is larger than a preset fault threshold value or not;
and if the current is larger than the preset fault threshold value, identifying that the current sensor is disconnected or the current sampling loop is abnormal.
The embodiment of the present invention further provides a system for detecting a fault of a frequency converter, including:
the first wave-generating unit is used for inputting a first set of wave-generating control signals to a three-phase inverter bridge in the frequency converter, and the first set of wave-generating control signals are used for enabling a preset phase line in the three-phase inverter bridge to generate forward current;
the first detection unit is used for detecting a first current generated by the preset phase line according to the first group of wave-emitting control signals;
the second wave-emitting unit is used for inputting a second set of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, and the second set of wave-emitting control signals are used for enabling the preset phase line to generate reverse current;
the second detection unit is used for detecting a second current generated by the preset phase line according to the second group of wave-emitting control signals;
and the fault identification unit is used for identifying the fault type and the fault position of the preset phase line according to the first current and the second current.
Preferably, the fault identification unit is specifically configured to:
if the first current and the second current are both zero, identifying that an output open-phase fault occurs at the position of the preset phase line in the three-phase inverter bridge;
if the first current is negative or the second current is positive, identifying that a reverse fault occurs in installation of a current sensor corresponding to the preset phase line in the three-phase inverter bridge;
and if any value of the first current and the second current is zero, identifying that an open-circuit fault of a switching tube occurs in the preset phase line in the three-phase inverter bridge.
The embodiment of the present invention further provides a frequency converter fault detection device, which includes a memory and a processor, where the memory stores a computer program that can be run on the processor, and the processor implements the steps of the method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the method are implemented.
According to the embodiments of the frequency converter fault detection method, the frequency converter fault detection system, the frequency converter fault detection equipment and the computer readable storage medium, the preset control signal is output to the three-phase inverter bridge, and faults such as phase loss and switching tube output of the frequency converter are rapidly positioned according to the output current of the three-phase inverter bridge.
The embodiment of the invention can also realize the faults of disconnection of the current sensor, reverse installation of the current sensor, wrong insertion of the position of the signal wire between the three-phase sensors and the like, and the fault can be effectively positioned by using the function in debugging the frequency converter, thereby greatly shortening the debugging period.
Drawings
FIG. 1 is a schematic diagram of a fault determination of a conventional frequency converter;
FIG. 2 is a schematic flow chart of a method for detecting a fault of a frequency converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for detecting a fault in a frequency converter according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for detecting a fault in a frequency converter according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a frequency converter fault detection device according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a frequency converter fault detection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 2 is a schematic flow chart of a method for detecting a fault of a frequency converter according to an embodiment of the present invention, which can quickly locate a fault of the frequency converter and obtain a fault type. The method for detecting the fault of the frequency converter in the embodiment can be executed by a main controller of the frequency converter and comprises the following steps
Step S11: a first set of wave-sending control signals are input to a three-phase inverter bridge in the frequency converter, and the first set of wave-sending control signals are used for enabling a preset phase line in the three-phase inverter bridge to generate a forward current (namely, a right direction in fig. 3). The preset phase line can be a U-phase line, a V-phase line or a W-phase line.
Referring to fig. 3, when the default phase line is a U-phase line, the bridge arm corresponding to the U-phase line in the three-phase inverter bridge is a U-phase bridge arm, and the U-phase bridge arm includes an upper bridge switching tube U + and a lower bridge switching tube U-. The other two phase lines are respectively a V-phase line and a W-phase line, and a bridge arm corresponding to the V-phase line in the three-phase inverter bridge is a V-phase bridge arm which comprises an upper bridge switching tube V + and a lower bridge switching tube V-; the bridge arm corresponding to the W-phase line in the three-phase inverter bridge is a W-phase bridge arm, and the W-phase bridge arm comprises an upper bridge switch tube W + and a lower bridge switch tube W-.
For example, when the default phase line is a U-phase line, the first set of wave-emitting control signals specifically includes first conduction pulses for respectively conducting an upper bridge switch tube U + of the U-phase bridge arm, a lower bridge switch tube V-of the V-phase bridge arm, and a lower bridge switch tube W-of the W-phase bridge arm (the lower bridge switch tube U + of the U-phase bridge arm, the upper bridge switch tube V + of the V-phase bridge arm, and the upper bridge switch tube W + of the W-phase bridge arm are respectively disconnected); correspondingly, the second group of wave-sending control signals comprise second conduction pulses for respectively conducting the lower bridge switch tube U of the U-phase bridge arm, the upper bridge switch tube V + of the V-phase bridge arm and the lower bridge switch tube W-of the W-phase bridge arm (the upper bridge switch tube U of the U-phase bridge arm, the lower bridge switch tube V-of the V-phase bridge arm and the upper bridge switch tube W + of the W-phase bridge arm are respectively disconnected).
The switching tubes U +, U-, V +, U-, W +, W-may be specifically IGBT (Insulated Gate Bipolar Transistor) or MOSFET (Metal-Oxide Semiconductor Field Effect Transistor).
Step S12: and detecting a first current generated by the preset phase line according to the first group of wave-sending control signals. The first current in the preset phase line can be obtained by sampling through the sensor H1 and the current sampling circuit.
In the above step S11, the pulse width of the first group of wave-emitting control signals may be gradually increased, and at the same time, in step S12, the first current is detected, and if the pulse width of the first group of wave-emitting control signals is greater than the set fault threshold value and the first current is still small, it may be considered that the current cannot flow through the bridge arm at the position where the phase line is located in the three-phase inverter bridge, and the first current may be regarded as zero. When the first current is zero, there are two possibilities, that is, an open-circuit fault occurs at the upper bridge switching tube where the preset phase line is located in the three-phase inverter bridge, or a phase-missing fault occurs at the position where the preset phase line is located in the three-phase inverter bridge of the frequency converter, and further identification is required through steps S13 and S14.
Step S13: and inputting a second group of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, wherein the second group of wave-emitting control signals are used for enabling the preset phase line to generate reverse current (namely, the left direction in the figure 3).
Step S14: and detecting a second current generated by the preset phase line according to the second group of wave-sending control signals. The second current in the preset phase line can be obtained by sampling through the sensor H1 and the current sampling circuit.
In the step S13, the pulse width of the second set of wave-emitting control signals may also be gradually increased, and at the same time, the step S14 detects the second current, and if the pulse width of the second set of wave-emitting control signals is greater than the set fault threshold and the second current is still small, it may be considered that the current cannot flow through the bridge arm at the position where the phase line is located in the three-phase inverter bridge, and the second current may be regarded as zero.
Step S15: and identifying the fault position and the fault type of the preset phase line according to the first current and the second current.
Specifically, in this step, if the first current and the second current are both zero, it is identified that an output open-phase fault occurs at a position where a preset phase line in the three-phase inverter bridge is located; if the first current is negative (i.e. the first current flows in the left direction of fig. 3) or the second current is positive (i.e. the second current flows in the right direction of fig. 3), identifying that the installation reverse fault occurs in the current sensor corresponding to the preset phase line in the three-phase inverter bridge; and if any value of the first current and the second current is zero, identifying that the open-circuit fault of the switching tube occurs in a preset phase line in the three-phase inverter bridge.
Particularly, if the first current is zero and the second current is not zero, identifying that an open-circuit fault occurs in a bridge arm upper bridge switching tube of a preset phase line in the three-phase inverter bridge; and if the first current is not zero and the second current is zero, identifying that an open-circuit fault occurs in the bridge arm lower bridge switching tube of a preset phase line in the three-phase inverter bridge.
As shown in fig. 4, in another embodiment of the method for detecting a fault of a frequency converter of the present invention, the method includes:
step S41: and outputting a first group of wave-sending control signals to a three-phase inverter bridge of the frequency converter, and detecting to obtain a first current of a first phase line, a third current of a second phase line and a fourth current of a third phase line of the three-phase inverter bridge. In practical application, the first phase line can be any one of a U-phase line, a V-phase line and a W-phase line.
In the following, the first phase line is a U-phase line, the second phase line is a V-phase line, and the third phase line is a W-phase line. The first set of wave-emitting control signals specifically includes first conduction pulses for respectively conducting an upper bridge switching tube U + of the U-phase bridge arm, a lower bridge switching tube V-of the V-phase bridge arm, and a lower bridge switching tube W-of the W-phase bridge arm (the lower bridge switching tube U + of the U-phase bridge arm, the upper bridge switching tube V + of the V-phase bridge arm, and the upper bridge switching tube W + of the W-phase bridge arm are respectively turned off).
Step S42: and outputting a second group of wave-sending control signals to a three-phase inverter bridge of the frequency converter, and detecting to obtain a second current of a first phase line, a fifth current of a second phase line and a sixth current of a third phase line of the three-phase inverter bridge. The second group of wave-emitting control signals comprise second conduction pulses for respectively conducting a lower bridge switch tube U of the U-phase bridge arm, an upper bridge switch tube V + of the V-phase bridge arm and a lower bridge switch tube W-of the W-phase bridge arm (the upper bridge switch tube U of the U-phase bridge arm, the lower bridge switch tube V-of the V-phase bridge arm and the upper bridge switch tube W + of the W-phase bridge arm are respectively disconnected).
Step S43: and outputting a third group of wave-sending control signals to a three-phase bridge arm of the three-phase inverter bridge, and detecting to obtain a seventh current of the first phase line, an eighth current of the second phase line and a ninth current of the third phase line of the three-phase inverter bridge. The third group of wave-emitting control signals comprise third conducting pulses for respectively conducting a lower bridge switch tube U of the U-phase bridge arm, a lower bridge switch tube V of the V-phase bridge arm and an upper bridge switch tube W + of the W-phase bridge arm (the upper bridge switch tube U of the U-phase bridge arm, the lower bridge switch tube V + of the V-phase bridge arm and the upper bridge switch tube W-of the W-phase bridge arm are respectively turned off).
Step S44: and judging the fault according to the first current, the second current, the third current, the fourth current, the fifth current, the sixth current, the seventh current, the eighth current and the ninth current.
Also, in this step, if both the first current and the second current (or the seventh current) are zero, it is identified that the first phase output is out of phase; if the first current is zero and the second current (or the seventh current) is not zero, identifying that the upper bridge switching tube U + of the U-phase bridge arm of the three-phase inverter bridge is open; and if the first current is not zero and the second current (or the seventh current) is zero, identifying that the lower bridge switching tube of the U-phase bridge arm of the three-phase inverter bridge is in a U-open circuit. Similarly, if the fifth current and the third current (or the eighth current) are both zero, it is identified as a V-phase output open-phase of the three-phase inverter bridge; if the fifth current is zero and the third current (or the eighth current) is not zero, identifying the upper bridge switching tube as the V + open circuit of the V-phase bridge arm; and if the fifth current is not zero and the third current (or the eighth current) is zero, identifying that the lower bridge switching tube of the V-phase bridge arm of the three-phase inverter bridge is in a V-open circuit. If the ninth current and the fourth current (or the sixth current) are both zero, identifying the W-phase output open-phase of the three-phase inverter bridge; if the ninth current is zero and the fourth current (or the sixth current) is not zero, identifying the three-phase inverter bridge as an upper bridge switching tube W + open circuit of a W-phase bridge arm of the three-phase inverter bridge; and if the ninth current is not zero and the fourth current (or the sixth current) is zero, identifying that the lower bridge switching tube W-of the W-phase bridge arm of the three-phase inverter bridge is open.
In this step, after the first current and the third current are obtained, whether the sensors H1, H2 on the first phase line and the second phase line are reverse can be judged according to the values of the first current and the third current. Specifically, under normal conditions, the absolute value of the first current is twice the absolute value of the third current, but if the absolute value of the third current is twice the absolute value of the first current, it is recognized that sensors H1, H2 are reversed (i.e., sensor H1 is connected to the second phase line and sensor H2 is connected to the first phase line). Similarly, it can be determined whether the sensors on the first and third phases are reversed according to the values of the first and fourth currents, that is, when the absolute value of the fourth current is twice the absolute value of the first current, it is identified that the sensors H1 and H3 are reversed (i.e., the sensor H1 is connected to the third phase and the sensor H3 is connected to the first phase). Whether the sensors H2 and H3 on the second phase line and the third phase line are reversely connected can be judged according to the values of the fifth current and the sixth current, namely when the absolute value of the sixth current is twice of the absolute value of the fifth current, the sensors H2 and H3 are identified as reversely connected (namely the sensor H2 is connected to the third phase line, and the sensor H3 is connected to the second phase line).
The execution sequence of the above steps S41, S42, and S43 may be interchanged, and the fault location in step S44 may be performed after obtaining the corresponding current, without waiting for all the currents to be detected and obtained.
Before the steps S41, S42, and S43 are executed, a detection circuit connected to the sensors H1, H2, and H3 and the current sampling circuit may determine whether the sensors H1, H2, and H3 are abnormal.
According to the frequency converter fault detection method, the faults of phase loss of output of the frequency converter, open circuit of the switching tube, reverse installation of the current sensor and wrong insertion of the signal line position between the three-phase sensors can be quickly positioned through three groups of wave-emitting control signals, and the function can be used for effectively positioning the faults during product debugging, so that the debugging period is greatly shortened.
In addition, various fault positioning of the frequency converter can be realized through six groups of wave-emitting control signals, wherein the first group of wave-emitting control signals comprise conducting pulses (other switching tubes are disconnected) for respectively conducting an upper bridge switching tube U + of the first bridge arm and a lower bridge switching tube V-of the second bridge arm; the second group of wave-sending control signals comprise conducting pulses (other switching tubes are disconnected) for respectively conducting a lower bridge switching tube U of the first bridge arm and an upper bridge switching tube V + of the second bridge arm; the third group of wave-sending control signals comprise conducting pulses (other switching tubes are disconnected) which respectively conduct an upper bridge switching tube U of the first bridge arm and a lower bridge switching tube W-of the third bridge arm; the fourth group of wave-sending control signals comprise conducting pulses (other switching tubes are disconnected) for respectively conducting an upper bridge switching tube V 'of the second bridge arm and a lower bridge switching tube W' of the third bridge arm; the fifth group of wave-generating control signals comprise conducting pulses (other switching tubes are disconnected) for respectively conducting a lower bridge switching tube U of the first bridge arm and an upper bridge switching tube W + of the third bridge arm; the sixth group of wave-generating control signals includes on pulses (other switching tubes are off) for respectively turning on the lower bridge switching tube V of the second bridge arm and the upper bridge switching tube W + of the third bridge arm. Although all fault judgment can be realized by the scheme, the wave generation types are multiple, and the time consumption is relatively long.
As shown in fig. 5, an embodiment of the present invention further provides a frequency converter fault detection apparatus, which may be integrated into a frequency converter, and a sensor and a current sampling circuit for detecting a current of a three-phase output line of a three-phase inverter bridge are further integrated in the frequency converter. The frequency converter failure detection device of the present embodiment comprises a memory 51 and a processor 52, and a computer program operable on the processor 52 is stored in the memory 51, and the steps of the method described above are implemented when the processor 52 executes the computer program. The device of the embodiment of the present invention and the detection method of fig. 2 and 4 belong to the same concept, and specific implementation processes thereof are described in detail in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in the device embodiments, which are not described herein again. It will be understood by those of ordinary skill in the art that all or some of the steps of the disclosed methods of the present embodiments may be implemented as software, firmware, hardware, or any suitable combination thereof.
An embodiment of the present invention further provides a storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the method are implemented. The storage medium of the embodiment of the present invention and the method for detecting a fault of a frequency converter belong to the same concept, and specific implementation processes thereof are described in detail in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in the present embodiment, which is not described herein again. It will be understood by those of ordinary skill in the art that all or some of the steps of the disclosed methods of the present embodiments may be implemented as software, firmware, hardware, or any suitable combination thereof.
As shown in fig. 6, an embodiment of the present invention further provides a frequency converter fault detection system, where the system includes: the first wave-emitting unit 61, the first detecting unit 62, the second wave-emitting unit 63, the second detecting unit 64, and the fault identifying unit 65 are respectively implemented by corresponding hardware and software.
The first wave-generating unit 61 is configured to input a first set of wave-generating control signals to a three-phase inverter bridge in the frequency converter, where the first set of wave-generating control signals are used to enable a preset phase line in the three-phase inverter bridge to generate a forward current. The preset phase line can be any one of a U-phase line, a V-phase line and a W-phase line.
The first detecting unit 62 is configured to detect a first current generated by the preset phase line according to the first group of wave-generating control signals. The first current in the preset phase line can be obtained by sampling through the sensor H1 and the current sampling circuit, and the forward current in this embodiment means that the value of the first current is positive, i.e. the right direction in fig. 3.
The second wave-generating unit 63 is configured to input a second set of wave-generating control signals to the three-phase inverter bridge in the frequency converter, where the second set of wave-generating control signals is used to enable the preset phase line to generate a reverse current, and the reverse current is a negative value of the second current, that is, a left direction in fig. 3.
The second detecting unit 64 is configured to detect a second current generated by the preset phase line according to the second group of wave-generating control signals. The second current in the preset phase line can be obtained by sampling through the sensor H1 and the current sampling circuit.
The fault identifying unit 65 is configured to identify a fault type and a fault location of the preset phase line according to the first current and the second current.
Preferably, the fault identification unit is specifically configured to:
if the first current and the second current are both zero, identifying that an output open-phase fault occurs at the position of the preset phase line in the three-phase inverter bridge;
if the first current is negative or the second current is positive, identifying that a reverse fault occurs in installation of a current sensor corresponding to the preset phase line in the three-phase inverter bridge;
and if any value of the first current and the second current is zero, identifying that an open-circuit fault of a switching tube occurs in the preset phase line in the three-phase inverter bridge.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A frequency converter fault detection method is characterized by comprising the following steps:
inputting a first group of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, wherein the first group of wave-emitting control signals are used for enabling a preset phase line in the three-phase inverter bridge to generate a forward current;
detecting a first current generated by the preset phase line according to the first group of wave-sending control signals;
inputting a second group of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, wherein the second group of wave-emitting control signals are used for enabling the preset phase line to generate reverse current;
detecting a second current generated by the preset phase line according to the second group of wave-emitting control signals;
and identifying the fault type and the fault position of the preset phase line according to the first current and the second current.
2. The frequency converter fault detection method according to claim 1, wherein said identifying a fault type and a fault location of the preset phase line according to the first current and the second current comprises:
if the first current and the second current are both zero, identifying that an output open-phase fault occurs at the position of the preset phase line in the three-phase inverter bridge;
if the first current is negative or the second current is positive, identifying that a reverse fault occurs in installation of a current sensor corresponding to the preset phase line in the three-phase inverter bridge;
and if any value of the first current and the second current is zero, identifying that an open-circuit fault of a switching tube occurs in the preset phase line in the three-phase inverter bridge.
3. The method for detecting a fault in a frequency converter according to claim 2, wherein identifying an open-circuit fault of a switching tube in the predetermined phase line in the three-phase inverter bridge if any one of the first current and the second current is zero comprises:
if the first current is zero and the second current is not zero, identifying that an open-circuit fault occurs in a bridge arm upper bridge switching tube of the preset phase line in the three-phase inverter bridge;
and if the first current is not zero and the second current is zero, identifying that an open-circuit fault occurs in a bridge arm lower bridge switching tube of the preset phase line in the three-phase inverter bridge.
4. The frequency converter fault detection method of claim 1, wherein the method further comprises:
when a first group of wave-sending control signals are input into the three-phase inverter bridge, detecting and obtaining the other two phase lines of the three-phase inverter bridge to obtain a third current and a fourth current;
judging whether a current sensor signal wire between a phase line corresponding to the first current and a phase line corresponding to the third current is inserted at a wrong position or not according to the first current and the third current;
and judging whether the current sensor signal wire between the phase line corresponding to the first current and the phase line corresponding to the fourth current is inserted at a wrong position or not according to the first current and the fourth current.
5. The frequency converter fault detection method of claim 4, wherein the method further comprises:
when a second group of wave-emitting control signals are input into the three-phase inverter bridge, detecting and obtaining the other two phase lines of the three-phase inverter bridge to obtain a fifth current and a sixth current;
and judging whether the current sensor signal wire between the phase line corresponding to the fifth current and the phase line corresponding to the sixth current is inserted at a wrong position or not according to the values of the fifth current and the sixth current.
6. The method for detecting the fault of the frequency converter according to claim 1, wherein before inputting the first set of wave-transmitting control signals to the three-phase inverter bridge in the frequency converter, the method further comprises:
acquiring a current sampling digital value of a current sampling loop in the frequency converter;
judging whether the current sampling digital value is larger than a preset fault threshold value or not;
and if the current is larger than the preset fault threshold value, identifying that the current sensor is disconnected or the current sampling loop is abnormal.
7. A frequency converter fault detection system, comprising:
the first wave-generating unit is used for inputting a first set of wave-generating control signals to a three-phase inverter bridge in the frequency converter, and the first set of wave-generating control signals are used for enabling a preset phase line in the three-phase inverter bridge to generate forward current;
the first detection unit is used for detecting a first current generated by the preset phase line according to the first group of wave-emitting control signals;
the second wave-emitting unit is used for inputting a second set of wave-emitting control signals to a three-phase inverter bridge in the frequency converter, and the second set of wave-emitting control signals are used for enabling the preset phase line to generate reverse current;
the second detection unit is used for detecting a second current generated by the preset phase line according to the second group of wave-emitting control signals;
and the fault identification unit is used for identifying the fault type and the fault position of the preset phase line according to the first current and the second current.
8. The frequency converter fault detection system of claim 7, wherein the fault identification unit is specifically configured to:
if the first current and the second current are both zero, identifying that an output open-phase fault occurs at the position of the preset phase line in the three-phase inverter bridge;
if the first current is negative or the second current is positive, identifying that a reverse fault occurs in installation of a current sensor corresponding to the preset phase line in the three-phase inverter bridge;
and if any value of the first current and the second current is zero, identifying that an open-circuit fault of a switching tube occurs in the preset phase line in the three-phase inverter bridge.
9. Frequency converter fault detection device, characterized in that it comprises a memory and a processor, in which a computer program is stored that is executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any one of claims 1 to 6.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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