CN117092554B - Inverter coupling fault analysis method and device, electronic equipment and storage medium - Google Patents
Inverter coupling fault analysis method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention provides an inverter coupling fault analysis method, an inverter coupling fault analysis device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring a three-phase current signal when an inverter fails; performing fault mode analysis according to the three-phase current signals, and determining fault modes of the three-phase current signals; performing wavelet decomposition processing according to a fault mode of the three-phase current signal to obtain a first fault characteristic; performing energy duty cycle calculation on the first fault characteristics, and determining second power tube fault characteristics and second current sensor fault characteristics of the first fault; and identifying the fault characteristics of the second power tube and the fault characteristics of the second current sensor by adopting an auxiliary method to obtain the fault characteristics of the third power tube and the fault characteristics of the third current sensor, so as to determine the coupling fault type of the inverter. The beneficial effects of the invention are as follows: the method realizes the differentiation of the coupling faults of the inverter and improves the accuracy of the coupling fault analysis of the inverter.
Description
Technical Field
The present invention relates to the field of computers and electric power technologies, and in particular, to a method and apparatus for analyzing an inverter coupling fault, an electronic device, and a storage medium.
Background
The grid-connected inverter can convert direct current into alternating current, and simultaneously synchronizes the frequency and the phase of output alternating current with the mains supply, so that the grid-connected inverter can be widely applied to renewable energy grid-connected power generation systems.
The safe and stable operation of the grid-connected inverter has important significance for guaranteeing the reliability of the whole converter system. However, due to long-term operation, the power tubes in the grid-connected inverter can bear high electrothermal stress, and the aging process is accelerated and is extremely prone to failure. The power tube faults are mainly divided into short circuit faults and open circuit faults. The short circuit fault has a mature protection scheme, and the series fuse is converted into an open circuit fault to prevent the generation of overcurrent; open circuit faults are not prone to over-voltage or over-current, but are latent, and secondary faults are prone to being caused if the faults are not handled in time. The current sensor is used as an information channel of closed-loop control of the whole current transformation system, and the fault of the current sensor has a fatal influence on the system operation, wherein the influence of zero output fault of the current sensor is the most serious.
The power tube fault and the current sensor fault are coupled to each other in the system. On one hand, the fault of the current sensor can cause overcurrent through controlling a closed loop, so that the power tube is in fault; on the other hand, the diagnosis of the power tube faults and the current sensor faults needs to be judged through sensor signals, and fault characteristics of the power tube faults and the current sensor faults are staggered and aliased in a signal channel, so that the faults are difficult to accurately position.
Disclosure of Invention
The embodiment of the invention mainly aims to provide an inverter coupling fault analysis method, an inverter coupling fault analysis device, electronic equipment and a storage medium, so that the distinction of the inverter coupling faults is realized, and the accuracy of the inverter coupling fault analysis is improved.
An aspect of the present invention provides an inverter coupling fault analysis method, including:
according to the inverter fault analysis request, acquiring a three-phase current signal when the inverter is in fault, wherein the three-phase current comprises an A-phase current, a B-phase current and a C-phase current;
performing fault mode analysis according to the three-phase current signals, and determining fault modes of the three-phase current signals;
performing wavelet decomposition processing according to the fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic;
performing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio, and determining a second power tube fault characteristic and a second current sensor fault characteristic of the first fault according to the energy duty ratio;
identifying the second power tube fault characteristics and the second current sensor fault characteristics by adopting an auxiliary method to obtain third power tube fault characteristics and third current sensor characteristics, wherein the auxiliary method comprises a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals;
and determining the coupling fault type of the inverter according to the third power tube fault characteristic and the third current sensor characteristic.
The inverter coupling fault analysis method according to the present invention, wherein the determining the fault mode of the three-phase current signal according to the fault mode analysis performed on the three-phase current signal, includes:
according to at least one corresponding current harmonic waveform of the phase A current, the phase B current and the phase C current and the current harmonic waveform change of the other two phases, determining a fault mode of a corresponding power tube by adopting three-phase current balance;
and determining a fault mode of the current sensor according to at least one corresponding current waveform amplitude and the current waveform amplitude change of the other two phases in the phase A current, the phase B current and the phase C current.
The inverter coupling fault analysis method according to claim, wherein the wavelet decomposition processing is performed according to a fault mode of the three-phase current signal, comprising:
performing discrete wavelet decomposition processing on the fault mode to obtain time domain signals converted to frequencies with different scales, wherein the wavelet decomposition is performed by
Wherein,j=1,2,…,m，for the initial time domain signal>And->The scale function and the wavelet function are respectively,a m as an approximation of the final decomposition scale,c j is the firstjAnd detail coefficients of each scale, wherein t represents discrete time, k represents a transformation position, and m is the number of decomposition layers.
The inverter coupling fault analysis method according to the present invention, wherein the method further comprises:
performing multi-scale decomposition on the output current by using db3 wavelet to obtain a corresponding number of sub-bands;
and filtering the high-frequency noise of the sub-frequency band to obtain the main frequency of the filtered noise.
The inverter coupling fault analysis method according to the present invention, wherein the calculating the energy duty ratio of the first fault feature to obtain an energy duty ratio, and determining the fault feature of the second power tube and the fault feature of the second current sensor of the first fault according to the energy duty ratio, includes:
performing energy calculation on the main frequency of the noise filtering, wherein the calculation mode is that
Wherein E represents energy, a is subband energy, n is the number of frequency bands, and k is a natural number smaller than n and larger than 0;
selecting the energy ratio of the low-frequency component of the three-phase current as a fault characteristic quantity, and calculating the energy ratio as
Wherein F is x Is thatxThe energy value of the low frequency component of the phase output current,P x to output the ratio of low frequency energy to total energy of the current,、/>is->Energy values of the A-phase current, the B-phase current and the C-phase current are respectively;
and comparing the energy duty ratio of the fault characteristic quantity with a preset energy duty ratio value, and determining the fault characteristic of the second power tube and the fault characteristic of the second current sensor.
According to the inverter coupling fault analysis method, the preset energy ratio is 0.3.
The inverter coupling fault analysis method according to the present invention, wherein the identifying the second power tube fault feature and the second current sensor fault feature by using an auxiliary method to obtain a third power tube fault feature and a third current sensor feature, includes:
the positive and negative identification method of the three-phase current average value comprises the steps of obtaining the average value of positive and negative identifications of any three-phase current, detecting the average value of the positive and negative identifications, and determining the fault characteristics of the third power tube, wherein the average value of the positive and negative identifications comprises 0, -1 and 1, wherein 0 represents normal, -1 represents open-circuit faults of an upper bridge arm, and 1 represents open-circuit faults of a lower bridge arm;
the method for identifying the sum of three-phase current signals comprises determining the characteristics of the third current sensor through the sum of the average values of positive and negative marks of the sum of three-phase currents in a mode of calculating the sum of the phase currents
Wherein I is the sum of the average values of the positive and negative marks,、/>is->The average value of positive and negative marks of the A-phase current, the average value of positive and negative marks of the B-phase current and the average value of positive and negative marks of the C-phase current are respectively represented.
Another aspect of the embodiments of the present invention provides an inverter coupling fault analysis apparatus, including:
the first module is used for acquiring a three-phase current signal when the inverter fails according to the inverter failure analysis request, wherein the three-phase current comprises an A-phase current, a B-phase current and a C-phase current;
a second module for performing a fault mode analysis from the three-phase current signal, determining a fault mode of the three-phase current signal;
the third module is used for executing wavelet decomposition processing according to the fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic;
the fourth module is used for executing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio value, and determining second power tube fault characteristics and second current sensor fault characteristics of the first faults according to the energy duty ratio value;
a fifth module, configured to identify the second power tube fault feature and the second current sensor fault feature by using an auxiliary method, to obtain a third power tube fault feature and a third current sensor feature, where the auxiliary method includes a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals;
and the sixth module is used for determining the coupling fault type of the inverter according to the third power tube fault characteristics and the third current sensor characteristics.
Another aspect of an embodiment of the present invention provides an electronic device, including a processor and a memory;
the memory is used for storing programs;
the processor executes the program to implement the method as described above.
Embodiments of the present invention also disclose a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The computer instructions may be read from a computer-readable storage medium by a processor of a computer device, and executed by the processor, cause the computer device to perform the method described previously.
The beneficial effects of the invention are as follows: through fault modal analysis, interference between the output current characteristics of the open-circuit faults of the power tubes of the upper bridge arm and the lower bridge arm in the same phase and the similarity of the zero output fault characteristics of the phase current sensor is avoided; the energy duty ratio of the low-frequency component of the three-phase output current is adopted to accurately distinguish the open-circuit faults of the power tubes with different phases from the faults of the current sensor; based on the energy duty ratio, the power tube fault and the current sensor fault can be effectively distinguished by means of the sum of the average value of the output current and the three-phase current.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is an inverter topology.
Fig. 2 is a schematic diagram of an inverter coupling fault analysis system according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an inverter coupling fault analysis flow according to an embodiment of the present invention.
Fig. 4 is a waveform diagram of an inverter three-phase current under normal conditions according to an embodiment of the present invention.
Fig. 5 is a three-phase current waveform diagram of an inverter under a phase a upper arm fault in an embodiment of the present invention.
Fig. 6 is a waveform diagram of three-phase current of an inverter under a A, B two-phase upper arm fault in an embodiment of the invention.
Fig. 7 is a waveform diagram of three-phase current of an inverter under a failure of an a-phase current sensor according to an embodiment of the present invention.
Fig. 8 is a graph of output current decomposition results under VT1 failure of an embodiment of the present invention.
Fig. 9 is a schematic diagram of a wavelet decomposition flow chart in accordance with an embodiment of the present invention.
Fig. 10 is a schematic diagram of an inverter coupling fault analysis apparatus according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. In the following description, suffixes such as "module", "part" or "unit" for representing elements are used only for facilitating the description of the present invention, and have no particular meaning in themselves. Thus, "module," "component," or "unit" may be used in combination. "first", "second", etc. are used for the purpose of distinguishing between technical features only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated. In the following description, the continuous reference numerals of the method steps are used for facilitating examination and understanding, and the technical effects achieved by the technical scheme of the invention are not affected by adjusting the implementation sequence among the steps in combination with the overall technical scheme of the invention and the logic relations among the steps. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
Referring to fig. 1, fig. 1 is a topology diagram of a three-phase inverter. The inverter has three bridge arms in total, and the direct-current side input can be converted into three-phase alternating-current output by controlling the three bridge arms. VT (VT) 1 And VT (VT) 2 ，VT 3 And VT (VT) 4 And VT (VT) 5 And VT (VT) 6 Switching devices of phase a, phase B and phase C, respectively.
The basic operation mode of the inverter is 180 degrees of sequential conduction, and only three bridge arms are conducted at each moment, so that eight different conduction modes are provided in total. Through the combination of different conduction modes, three-phase currents with certain amplitude and 120 degrees of phase difference can be obtainedi A 、i B Andi C 。
referring to fig. 2, fig. 2 is a schematic diagram of an inverter coupling fault analysis system according to the present invention, which includes a three-phase inverter 100, a fault information collection unit 200, a server 300 and a client 400, wherein the server 300 is connected to the fault information collection unit 200 and the client 400 through a wireless communication manner (e.g. 4G/5G), the fault information collection unit 200 is used for periodically collecting three-phase current signals of the three-phase inverter 100, and the server 300 is used for obtaining three-phase current signals when the inverter fails according to an inverter fault analysis request, wherein the three-phase current includes a-phase current, B-phase current and C-phase current; performing fault mode analysis according to the three-phase current signals, and determining fault modes of the three-phase current signals; performing wavelet decomposition processing according to a fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic; performing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio, and determining the second power tube fault characteristics and the second current sensor fault characteristics of the first fault according to the energy duty ratio; identifying the fault characteristics of the second power tube and the fault characteristics of the second current sensor by adopting an auxiliary method to obtain the fault characteristics of the third power tube and the characteristics of the third current sensor, wherein the auxiliary method comprises a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals; determining a coupling fault type of the inverter according to the third power tube fault characteristics and the third current sensor characteristics; and transmits the determined three-phase inverter coupling fault type to the client 400.
In some embodiments, the fault information collection device 200 includes sensors, current collectors, power distribution terminals, and the like.
In some embodiments, wherein the inverter fault analysis includes determining a fault type at the time of at least one of the upper and lower legs (power tubes) of the three-phase current and the current sensor, in particular, fault coupling occurs when the upper and lower legs of the three-phase current and the current sensor are simultaneously failed.
Referring to fig. 3, an inverter coupling fault analysis flow diagram is illustrated, including but not limited to steps S100-S600:
s100, acquiring a three-phase current signal when an inverter fails according to an inverter failure analysis request, wherein the three-phase current comprises an A-phase current, a B-phase current and a C-phase current;
s200, performing fault mode analysis according to the three-phase current signals, and determining the fault mode of the three-phase current signals.
In some embodiments, wherein the failure mode analysis is performed separately from the failure-producing device.
In some embodiments, according to at least one corresponding current harmonic waveform of the phase A current, the phase B current and the phase C current and the current harmonic waveform change of the other two phases, determining a fault mode of the corresponding power tube by adopting three-phase current balance; and determining a fault mode of the current sensor according to at least one corresponding current waveform amplitude and current waveform amplitude changes of the other two phases in the A-phase current, the B-phase current and the C-phase current.
Exemplary, power tube failure mode analysis referring to the inverter three-phase current waveform diagram under normal conditions shown in fig. 4, when an open circuit failure occurs in the a-phase power tube VT1, if the output current is in the positive half cycle, the current cannot flow through VT1 and the output current is zero; if the output current is in the negative half cycle, the VT1 fault does not affect the current path, and the output current is normal. Meanwhile, when a single-tube fault occurs in the a-phase bridge arm, a certain influence is caused on B, C-phase current, harmonic components of other two-phase output currents are increased, and particularly, as shown in an inverter three-phase current waveform diagram of the a-phase upper bridge arm fault shown in fig. 5, the start time of the a-phase upper bridge arm fault is 0.3s, and s is seconds. Referring to the three-phase current waveform diagram of the inverter under the A, B two-phase upper bridge arm fault shown in fig. 6, the upper bridge arm fault starting time is 0.3s, when the power tube open fault occurs in the upper bridge arm and the lower bridge arm of the phase a simultaneously, no current flows in the phase a, and according to the three-phase current balance, the sum of the currents in the phase B, C is zero, and the magnitude and the direction are opposite.
Exemplary, current sensor fault modal analysis referring to the three-phase current waveform diagram of the inverter under a phase a current sensor fault shown in fig. 7, when the phase a current sensor has a zero output fault, the fault onset time is 0.3s, and the currents of the phase b and phase C also change similarly. In the initial stage of the fault, the amplitude of B, C two-phase current increases, and the phase of the current also moves forward; as the closed loop control system influences, the B, C phase output current will gradually increase and harmonics will always be present.
It will be appreciated that the power tube fault and the current sensor fault are not only coupled to each other in the signal path, but also have similar fault characteristics, and that the nuances of the two faults need to be distinguished by the fault modes.
And S300, performing wavelet decomposition processing according to a fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic.
In some embodiments, wherein the wavelet decomposition of the three-phase current signal is used to identify fault signatures in the three-phase current, the formula is:
（1）
wherein,j=1,2,…,m。for the initial time domain signal>And->The scale function and the wavelet function are respectively,a m as an approximation of the final decomposition scale,c j is the firstjAnd detail coefficients of each scale, wherein t represents discrete time, k represents a transformation position, and m is the number of decomposition layers.
In some embodiments, wavelet decomposition of the three-phase current signal refers to a wavelet decomposition flow chart shown in fig. 9, in which db3 wavelet is selected to perform 6-scale decomposition on the output current according to signal characteristics of a power tube fault and a current sensor fault, and referring to an output current decomposition result under VT1 fault shown in fig. 8, magnitudes of six high-frequency sub-bands are smaller, and waveform variation is complex. For the low frequency sub-band of the wavelet decomposition result, the pre-decomposition and post-decomposition output current waveforms are approximately the same, while the post-decomposition current waveform has less high frequency noise.
Referring to table 1, P values (energy duty cycle) of A, B, C phase output currents for different fault types are illustrated.
TABLE 1P value of A, B, C phase output currents for different fault types
The analysis of the above table shows that when the feature quantity of the fault diagnosis adopts the energy ratio of the low-frequency components of the three-phase output current, faults of different phases can be distinguished by setting an appropriate threshold value for the P value, wherein the threshold value for the P can be set to 0.3.
And S400, performing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio, and determining the second power tube fault characteristics and the second current sensor fault characteristics of the first fault according to the energy duty ratio.
In some embodiments, the energy characteristics of the current are extracted by taking the main frequency part of filtering high-frequency noise as an analysis object, and the energy calculation formula is as follows:
where E represents energy, a is subband energy, n is the number of bands, and k is a natural number less than n and greater than 0.
Based on the formula (2), selecting the energy ratio of the low-frequency component of the three-phase output current as the fault characteristic quantity, wherein the energy ratio is calculated according to the following formula:
wherein F is x Is thatxThe energy value of the low frequency component of the phase output current,P x the ratio of low frequency energy to total energy is the output current.
S500, identifying the fault characteristics of the second power tube and the fault characteristics of the second current sensor by adopting an auxiliary method to obtain the fault characteristics of the third power tube and the third current sensor, wherein the auxiliary method comprises a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals.
In some embodiments, the method for identifying the positive and negative identifications of the average value of the three-phase current comprises the steps of obtaining the average value of the positive and negative identifications of any three-phase current, detecting the average value of the positive and negative identifications, and determining the fault characteristic of the third power tube.
In some embodiments, it is understood that when an open circuit fault occurs in both power tubes of the same bridge arm, the energy duty cycle of the low frequency component of the three-phase output current is similar to that in the case of a current sensor fault. Therefore, the embodiment of the invention performs fault identification through the characteristic variable of the auxiliary method. The output current of the fault is close to zero in a half period, and the average value of the output current in one period has positive and negative differences. Thus, positive and negative signs of the output current average value can be utilizedS x As auxiliary identification basis for open circuit faults of upper and lower bridge arm power tubes.
Normally, the average value of the output current in one period is zero, namely:
S A =S B =S C =0（4）
when (when)xWhen the open-circuit fault occurs in the upper bridge arm of the phase, the average value of the output current of the phase in one period is negative, namely:
S x =-1（5）
when (when)xWhen an open circuit fault occurs in a phase lower bridge arm, the average value of the phase output current in one period is positive, and the phase output current comprises:
S x =1（6）
in some embodiments, the method of sum identification of three-phase current signals includes determining a third current sensor characteristic from a sum of averages of positive and negative identifications of the sum of three-phase currents.
In addition, since the three-phase current signal after the current sensor fails does not follow kirchhoff's law, the sum of the three-phase current signal is not zero, and the sum of the three-phase current signal can be used as a basis for judging the open-circuit fault of the power tube and the current sensor fault, namely:
obtaining A, B, C phase output current S of the digital model under different fault types x The values and I are shown in Table 2. It can be seen that table 1 and table 2 can accurately distinguish and diagnose the power tube fault and the current sensor fault.
TABLE 2S of A, B, C phase output currents for different fault types x And I
S600, determining the coupling fault type of the inverter according to the second three-phase current fault characteristic and the third power tube fault characteristic.
In some embodiments, it may be understood that, after determining the fault characteristics of the power tube fault and the current sensor fault, the fault type of the corresponding device may be determined according to the characteristics, and the fault analysis result may be output.
In some embodiments, the embodiment of the invention can also adopt a physical platform to build an inverter digital model, wherein the digital model comprises a power supply, a control circuit and an inverter, and a load adopts a three-phase motor. By setting two fault simulation signals, one acts on an inverter driving signal, and when the signal output is zero, the power tube is turned off and is used for simulating an open-circuit fault; and one acting on the output current signal for analog current sensor zero output or signal bias. And analyzing and diagnosing the faults of the power tube and the current sensor of the inverter through the model.
Referring to fig. 10, fig. 10 is a schematic diagram of an inverter coupling fault analysis apparatus according to an embodiment of the present invention, which includes a first module 1010, a second module 1020, a third module 1030, a fourth module 1040, a fifth module 1050, and a sixth module 1060.
The first module 1010 is configured to obtain, according to an inverter fault analysis request, a three-phase current signal when the inverter fails, where the three-phase current includes an a-phase current, a B-phase current, and a C-phase current; a second module 1020 for performing a fault mode analysis from the three-phase current signal, determining a fault mode of the three-phase current signal; a third module 1030, configured to perform wavelet decomposition processing according to a fault mode of the three-phase current signal, to obtain a first fault feature, where the first fault feature includes a first power tube fault feature and a first current sensor fault feature; a fourth module 1040, configured to perform energy duty ratio calculation on the first fault feature, obtain an energy duty ratio, and determine a second power tube fault feature and a second current sensor fault feature of the first fault according to the energy duty ratio; a fifth module 1050, configured to identify the second power tube fault feature and the second current sensor fault feature by using an auxiliary method, to obtain a third power tube fault feature and a third current sensor feature, where the auxiliary method includes a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals; a sixth module 1060 is configured to determine a coupling fault type of the inverter based on the third power tube fault signature and the third current sensor signature.
For example, with cooperation of the first module 1010, the second module 1020, the third module 1030, the fourth module 1040, the fifth module 1050, and the sixth module 1060 in the apparatus, the embodiment apparatus may implement any of the foregoing inverter coupling fault analysis methods, that is, obtain, according to an inverter fault analysis request, a three-phase current signal when the inverter fails, where the three-phase current includes an a-phase current, a B-phase current, and a C-phase current; performing fault mode analysis according to the three-phase current signals, and determining fault modes of the three-phase current signals; performing wavelet decomposition processing according to a fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic; performing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio, and determining the second power tube fault characteristics and the second current sensor fault characteristics of the first fault according to the energy duty ratio; identifying the fault characteristics of the second power tube and the fault characteristics of the second current sensor by adopting an auxiliary method to obtain the fault characteristics of the third power tube and the characteristics of the third current sensor, wherein the auxiliary method comprises a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals; and determining the coupling fault type of the inverter according to the third power tube fault characteristic and the third current sensor characteristic. The beneficial effects of the invention are as follows: through fault modal analysis, interference between the output current characteristics of the open-circuit faults of the power tubes of the upper bridge arm and the lower bridge arm in the same phase and the similarity of the zero output fault characteristics of the phase current sensor is avoided; the energy duty ratio of the low-frequency component of the three-phase output current is adopted to accurately distinguish the open-circuit faults of the power tubes with different phases from the faults of the current sensor; based on the energy duty ratio, the power tube fault and the current sensor fault can be effectively distinguished by means of the sum of the average value of the output current and the three-phase current.
The embodiment of the invention also provides electronic equipment, which comprises a processor and a memory;
the memory stores a program;
the processor executes a program to execute the inverter coupling fault analysis method; the electronic device has the function of carrying and running a software system for inverter coupling fault analysis provided by embodiments of the present invention, such as a personal computer, mini-computer, mainframe, workstation, network or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc.
Embodiments of the present invention also provide a computer-readable storage medium storing a program that is executed by a processor to implement the inverter coupling fault analysis method as described above.
In some alternative embodiments, the functions/acts noted in the block diagrams may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Furthermore, the embodiments presented and described in the flowcharts of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed, and in which sub-operations described as part of a larger operation are performed independently.
Embodiments of the present invention also disclose a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The computer instructions may be read from a computer-readable storage medium by a processor of a computer device, and executed by the processor, to cause the computer device to perform the inverter coupling fault analysis method described previously.
Furthermore, while the invention is described in the context of functional modules, it should be appreciated that, unless otherwise indicated, one or more of the described functions and/or features may be integrated in a single physical device and/or software module or one or more functions and/or features may be implemented in separate physical devices or software modules. It will also be appreciated that a detailed discussion of the actual implementation of each module is not necessary to an understanding of the present invention. Rather, the actual implementation of the various functional modules in the apparatus disclosed herein will be apparent to those skilled in the art from consideration of their attributes, functions and internal relationships. Accordingly, one of ordinary skill in the art can implement the invention as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative and are not intended to be limiting upon the scope of the invention, which is to be defined in the appended claims and their full scope of equivalents.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments described above, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (8)
1. An inverter coupling fault analysis method, comprising:
according to the inverter fault analysis request, acquiring a three-phase current signal when the inverter is in fault, wherein the three-phase current comprises an A-phase current, a B-phase current and a C-phase current;
performing fault mode analysis according to the three-phase current signals, and determining fault modes of the three-phase current signals;
performing wavelet decomposition processing according to the fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic;
performing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio, and determining a second power tube fault characteristic and a second current sensor fault characteristic of the first fault according to the energy duty ratio; the determining the second power tube fault characteristic and the second current sensor fault characteristic of the first fault according to the energy ratio value comprises the following steps: performing discrete wavelet decomposition processing on the fault mode to obtain time domain signals converted to frequencies with different scales; using db3 wavelets for the output currentPerforming multi-scale decomposition to obtain a corresponding number of sub-bands; filtering the high-frequency noise of the sub-frequency band to obtain a main frequency of the filtered noise; performing energy calculation on the main frequency of the noise filtering, wherein the calculation mode is thatWherein E represents energy, a is subband energy, n is the number of frequency bands, and k is a natural number smaller than n and larger than 0; selecting the energy ratio of the low-frequency component of the three-phase current as a fault characteristic quantity, and calculating the energy ratio to be +.>WhereinF x Is thatxThe energy value of the low frequency component of the phase output current,P x for outputting the ratio of low frequency energy to total energy of the current, +.>、/>A kind of electronic device with high-pressure air-conditioning systemEnergy values of the A-phase current, the B-phase current and the C-phase current are respectively; comparing the energy ratio of the fault characteristic quantity with a preset energy ratio value to determine the fault characteristic of the second power tube and the fault characteristic of the second current sensor;
identifying the second power tube fault characteristics and the second current sensor fault characteristics by adopting an auxiliary method to obtain third power tube fault characteristics and third current sensor characteristics, wherein the auxiliary method comprises a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals;
and determining the coupling fault type of the inverter according to the third power tube fault characteristic and the third current sensor characteristic.
2. The inverter coupling fault analysis method of claim 1 wherein the performing a fault mode analysis from the three-phase current signal, determining a fault mode of the three-phase current signal, comprises:
according to at least one corresponding current harmonic waveform of the phase A current, the phase B current and the phase C current and the current harmonic waveform change of the other two phases, determining a fault mode of a corresponding power tube by adopting three-phase current balance;
and determining a fault mode of the current sensor according to at least one corresponding current waveform amplitude and the current waveform amplitude change of the other two phases in the phase A current, the phase B current and the phase C current.
3. The inverter coupling fault analysis method of claim 1, wherein the wavelet decomposition comprises:
wherein,j=1,2,…,m，for the initial time domain signal>And->The scale function and the wavelet function are respectively,a m as an approximation of the final decomposition scale,c j is the firstjAnd detail coefficients of each scale, wherein t represents discrete time, k represents a transformation position, and m is the number of decomposition layers.
4. The inverter coupling fault analysis method of claim 1 wherein the predetermined energy duty cycle is 0.3.
5. The method of claim 1, wherein the identifying the second power tube fault signature and the second current sensor fault signature by using an auxiliary method to obtain a third power tube fault signature and a third current sensor signature comprises:
the positive and negative identification method of the three-phase current average value comprises the steps of obtaining the average value of positive and negative identifications of any three-phase current, detecting the average value of the positive and negative identifications, and determining the fault characteristics of the third power tube, wherein the average value of the positive and negative identifications comprises 0, -1 and 1, wherein 0 represents normal, -1 represents open-circuit faults of an upper bridge arm, and 1 represents open-circuit faults of a lower bridge arm;
the method for identifying the sum of three-phase current signals comprises determining the characteristics of the third current sensor through the sum of the average values of positive and negative marks of the sum of three-phase currents in a mode of calculating the sum of the phase currents
Wherein I is the sum of the average values of the positive and negative marks,、/>is->The average value of positive and negative marks of the A-phase current, the average value of positive and negative marks of the B-phase current and the average value of positive and negative marks of the C-phase current are respectively represented.
6. An inverter coupling fault analysis device, comprising:
the first module is used for acquiring a three-phase current signal when the inverter fails according to the inverter failure analysis request, wherein the three-phase current comprises an A-phase current, a B-phase current and a C-phase current;
a second module for performing a fault mode analysis from the three-phase current signal, determining a fault mode of the three-phase current signal;
the third module is used for executing wavelet decomposition processing according to the fault mode of the three-phase current signal to obtain a first fault characteristic, wherein the first fault characteristic comprises a first power tube fault characteristic and a first current sensor fault characteristic;
the fourth module is used for executing energy duty ratio calculation on the first fault characteristics to obtain an energy duty ratio value, and determining second power tube fault characteristics and second current sensor fault characteristics of the first faults according to the energy duty ratio value; the fourth module includes: the method comprises the steps of performing discrete wavelet decomposition processing on the fault mode to obtain time domain signals converted to frequencies with different scales; the method comprises the steps of performing multi-scale decomposition on output current by db3 wavelet to obtain a corresponding number of sub-bands; the method is used for filtering the high-frequency noise of the sub-frequency band to obtain the main frequency of the filtered noise; for performing energy calculation on the noise-filtered main frequency in such a manner thatWherein E represents energy, a is subband energy, n is the number of frequency bands, and k is a natural number smaller than n and larger than 0; for selecting the energy ratio of the low frequency component of the three-phase current as the fault characteristic quantity, the energy ratio is calculated as +.>WhereinF x Is thatxThe energy value of the low frequency component of the phase output current,P x for outputting the ratio of low frequency energy to total energy of the current, +.>、/>Is->Energy values of the A-phase current, the B-phase current and the C-phase current are respectively; the energy ratio of the fault characteristic quantity is compared with a preset energy ratio value, and the fault characteristic of the second power tube and the fault characteristic of the second current sensor are determined;
a fifth module, configured to identify the second power tube fault feature and the second current sensor fault feature by using an auxiliary method, to obtain a third power tube fault feature and a third current sensor feature, where the auxiliary method includes a positive and negative identification method of a three-phase current average value and a sum identification method of three-phase current signals;
and the sixth module is used for determining the coupling fault type of the inverter according to the third power tube fault characteristics and the third current sensor characteristics.
7. An electronic device comprising a processor and a memory;
the memory is used for storing programs;
the processor executing the program implements the inverter coupling fault analysis method of any one of claims 1-5.
8. A computer-readable storage medium, characterized in that the storage medium stores a program that is executed by a processor to implement the inverter coupling fault analysis method according to any one of claims 1 to 5.
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