CN113156337B - Method and device for online identification of single-tube open-circuit fault of VIENNA rectifier and storage medium - Google Patents
Method and device for online identification of single-tube open-circuit fault of VIENNA rectifier and storage medium Download PDFInfo
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Abstract
The application provides an online identification method for a VIENNA rectifier single tube open-circuit fault, which comprises the following steps: acquiring instantaneous amplitude of three-phase input current of the rectifier in real time, and if the input current of any phase has a zero-value stable region, judging that the phase is a current zero-crossing phase; calculating the zero-value platform duration of the current zero-crossing phase within a first preset time length, and if the zero-value platform duration is greater than a zero-value platform detection threshold, judging the phase as an open-circuit fault phase; converting three-phase input current of the rectifier into an alpha phase current component and a beta phase current component in real time, and delaying the beta phase current component for a second preset time to enable the phases of the alpha phase current component and the beta phase current component to be consistent or reciprocal; when any phase is judged to be a current-passing zero phase, counting the times that the amplitude of a beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time period of the phase; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase through which the current flows has a fault.
Description
Technical Field
The invention relates to open-circuit fault diagnosis of a switching tube of a power electronic converter, in particular to an online identification method for a single-tube open-circuit fault of a VIENNA rectifier.
Background
The switching tube (MOSFET or IGBT) is used as a main control device of the converter system, bears high-frequency and large current for a long time and is easy to be short-circuited or open-circuited. The short-circuit fault causes the converter to be greatly over-current or under-voltage, and the converter is easy to identify and protect by a self-contained protection circuit and finally turns into an open-circuit fault. When the open circuit fault occurs, the current transformer cannot generate large-amplitude overcurrent, overvoltage, undervoltage or undercurrent, is difficult to identify and cannot be protected. In converter faults, the probability of open-circuit faults of the switching tubes is as high as 38%. The electrical characteristics of the converter switching tube after the open circuit fault are influenced by the hardware topology and the control strategy of the converter switching tube.
Compared with the common three-level rectifier, the VIENNA rectifier has the advantages of small quantity of switching tubes, no bridge arm direct connection problem, simple structure, high circuit reliability and the like, and is widely applied to the fields of aviation, communication and the like. Particularly, with the rapid development of electric vehicles, the three-phase three-level VIENNA rectifier becomes an indispensable front end of a dc charging pile. When the rectifier works with faults, the output voltage is unstable, the power factor correction cannot be realized, the work of a lower circuit is influenced, and harmonic waves are generated to pollute a power grid. Especially, the open circuit fault of the VIENNA rectifier in the high-power direct-current charging pile not only affects the system performance of the charging station group, but also seriously pollutes the power grid.
At present, the method for diagnosing the open-circuit fault of the switching tube of the converter mainly comprises an artificial intelligence fault diagnosis method based on a neural network, wavelet analysis, harmonic analysis and the like, and a threshold fault diagnosis method based on a voltage and current signal sampling value, a three-phase current vector angle, a Concordia current mode radius and other transient time domain currents, wherein the fault diagnosis methods have the defects that the calculation amount is complex, a sampling signal exceeding one period is needed, the threshold is difficult to set, or a sensor is additionally arranged. Therefore, it is necessary to provide an on-line identification method for open circuit fault, which is convenient and fast, for VIENNA rectifiers which are widely used.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, the present application aims to provide an online identification method, apparatus and storage medium for single-tube open-circuit fault of VIENNA rectifier, which requires no additional sensor and only a small amount of sampling signals, so as to be able to guide in time to take fault-tolerant operation or protection measures, improve the operation stability of the charging apparatus and suppress the current harmonics of the power grid.
In one aspect, the present application provides an online identification method for single-tube open-circuit faults of a VIENNA rectifier, including the following steps: acquiring instantaneous amplitude values of three-phase input currents of the rectifier in real time, respectively judging whether the three-phase input currents have zero-value stable regions, and if any phase of input current has the zero-value stable region, judging that the phase is a current zero-crossing phase; calculating the zero-value platform duration of the current zero-crossing phase within a first preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold, and if the zero-value platform duration is greater than the zero-value platform detection threshold, judging the phase as an open-circuit fault phase; converting three-phase input current of the rectifier into alpha-phase current component and beta-phase current component under a two-phase static coordinate system in real time, and delaying the beta-phase current component for a second preset time period to enable the phases of the alpha-phase current component and the beta-phase current component to be consistent or reciprocal; when any phase is judged to be a current-passing zero phase, counting the times that the amplitude of a beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time period of the phase; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase through which the current flows has a fault.
According to the technical scheme provided by the embodiment of the application, the step of judging whether the three-phase input current has a zero-value stable region comprises the following steps: judging whether the instantaneous amplitude of the three-phase input current falls into a zero current detection threshold range or not; and if the instantaneous amplitude of the input current of any phase falls within the range of the zero current detection threshold, determining that the phase is a current zero-crossing phase.
According to the technical scheme provided by the embodiment of the application, when the phases of the alpha-phase current component and the beta-phase current component are consistent, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps:
if the times that the amplitude of the beta phase current component is larger than zero are larger than or equal to the times that the amplitude of the beta phase current component is smaller than zero, judging the upper bridge arm fault of the open-circuit fault phase; and if the times that the amplitude of the beta phase current component is greater than zero are less than the times that the amplitude of the beta phase current component is less than zero, judging the lower bridge arm fault of the open-circuit fault phase.
According to the technical scheme provided by the embodiment of the application, when the phases of the alpha-phase current component and the beta-phase current component are opposite to each other, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps:
if the times that the amplitude of the beta phase current component is larger than zero are smaller than the times that the amplitude of the beta phase current component is smaller than zero, judging the upper bridge arm fault of the open-circuit fault phase; and if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging the lower bridge arm fault of the open-circuit fault phase.
According to the technical scheme provided by the embodiment of the application, the step of judging the phase as the current zero-crossing phase further comprises the following steps: defining zero crossing flag epsilonkComprises the following steps:
wherein: i.e. ik(k ═ a, b, c) is the three-phase input current; i.e. ithDiagnostic threshold i for zero current detectionth。
According to the technical scheme provided by the embodiment of the application, the first preset duration is calculatedA step of zero plateau duration of current flow through the zero phase, comprising: setting a counting module W corresponding to a three-phase input currentk(k ═ a, b, c) when εkWhen the current changes from 0 to 1, a counting module W corresponding to the current zero-crossing phase is startedk(k ═ a, b, c) for a first preset duration of time; within a first preset time period, if epsilonkIs 1, then WkAccumulating for 1; if epsilonkIs 0, then WkNot accumulating; calculating the duration t of the current zero-value platformkComprises the following steps:
tk＝WkTs,k＝a,b,c
wherein: ts is the current sampling period.
According to the technical scheme provided by the embodiment of the application, when any phase is judged to be a zero-phase through which current flows, the step of counting the times that the amplitude of the beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time period of the phase comprises the following steps: setting counting modules W respectively corresponding to the upper bridge arm and the lower bridge arm in the three-phase bridge armβk1、Wβk2(k ═ a, b, c); when epsilonkWhen the current zero-crossing phase is 1, starting counting modules W respectively corresponding to an upper bridge arm and a lower bridge arm on the current zero-crossing phaseβk1、Wβk2Working for a first preset time; respectively counting the times that the amplitude of the beta-phase current component is greater than zero and the times that the amplitude of the beta-phase current component is less than zero within a first preset time length, and when the amplitude of the beta-phase current component is greater than zero, Wβk1Adding 1 in an accumulated way; when the amplitude of the beta phase current component is less than zero, Wβk2Adding 1 in an accumulated way; setting a switch tube diagnosis positioning variable n for comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero
When the phase of the alpha phase current component is consistent with that of the beta phase current component, if n is 1, the upper bridge arm of the open-circuit fault phase is in fault; if n is 0, the lower bridge arm of the open-circuit fault phase fails; when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, n is 1, the lower bridge arm of the open-circuit fault phase is in fault; and n is 0, the upper bridge arm of the open-circuit fault phase has a fault.
On the other hand, the application also provides a device for on-line identification of single-tube open-circuit faults of the VIENNA rectifier, which comprises the following steps: the current passing zero-phase judging module is used for acquiring instantaneous amplitude values of three-phase input currents of the rectifier in real time and respectively judging whether the three-phase input currents have zero-value stable regions, and if the input currents of any phase have the zero-value stable regions, judging the phase as a current zero-crossing phase; the open-circuit fault phase judgment module is used for calculating the zero-value platform duration time of the current zero-crossing phase within the first preset time length, comparing the zero-value platform duration time with a zero-value platform detection threshold value, and judging the phase as an open-circuit fault phase if the zero-value platform detection threshold value is greater than the zero-value platform detection threshold value; the current transformation module is used for transforming three-phase input current of the rectifier to alpha-phase current component and beta-phase current component under a two-phase static coordinate system in real time, and delaying the beta-phase current component for a second preset time period to enable the phases of the alpha-phase current component and the beta-phase current component to be consistent or reciprocal; the switching tube fault side judging module starts to count the times that the amplitude of a beta phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time length of any phase when the phase is judged to be a zero-phase through which the current flows; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase through which the current flows has a fault.
In another aspect, the present application further provides a computer device, including: a memory for storing executable program code; one or more processors configured to read executable program code stored in the memory to perform the method for on-line identification of a VIENNA rectifier single-tube open fault as described above.
In another aspect, the present application further provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method for online identification of single-tube open-circuit fault of VIENNA rectifier as described above.
In summary, the present application discloses an online identification method for single-tube open-circuit faults of a VIENNA rectifier, and the technical scheme provided by the present application monitors whether a zero-crossing phenomenon exists in three-phase input current in real time based on a current sensor of the VIENNA rectifier, and determines whether the phase has an open-circuit fault by collecting zero-value platform duration of the current zero-crossing phase within a first preset time duration and comparing the zero-value platform duration with a zero-value platform detection threshold when the zero-crossing phenomenon exists in any phase.
In addition, when the three-phase input current is monitored in real time, the method also transforms the three-phase input current in real time to obtain an alpha-phase current component and a beta-phase current component under a transformed two-phase static coordinate system, when any phase is measured to be a current zero-crossing phase, the alpha-phase current component also has a zero-value platform, and in view of the fact that the beta-phase current component and the alpha-phase current component are in the same phase or in the opposite phase, the times that the amplitude of the beta-phase current component corresponding to the phase input current is greater than zero and less than zero are counted at the same time when any phase is measured to be the current zero-crossing phase, and the times that the amplitude of the beta-phase current component is greater than zero and the times that the amplitude of the beta-phase current component is less than zero are compared, so that which bridge arm on the current-crossing zero phase has a fault can be obtained.
Based on the above online identification process, after a zero-value stable region occurs, on one hand, whether the current zero-crossing phase has an open-circuit fault or not is detected, and at the same time, on the other hand, the switching tube of which bridge arm on the zero-crossing phase the current flows is also detected to have a fault. Under the simultaneous judgment of the two aspects, if the current zero-crossing phase has an open-circuit fault, the current zero-crossing phase can quickly and timely diagnose the open-circuit fault phase and which bridge arm switch has the fault at the same time. In summary, according to the technical scheme provided by the application, on one hand, online identification of single-tube open-circuit faults of the VIENNA rectifier can be realized only by correspondingly processing and analyzing three-phase input currents without adding additional sensors or changing hardware; on the other hand, when the open-circuit fault phase and the switching tube of which bridge arm on the open-circuit fault phase are judged to have a fault, synchronous statistics is carried out simultaneously within a first preset time length, so that rapid and efficient diagnosis can be realized; on the other hand, the online identification method provided by the application has a simple operation process, and the first preset time length and the related threshold value are simple and convenient to set. Compared with the diagnosis method in the prior art, or the algorithm is complex and has large calculation amount; or an additional sensor needs to be added, the method can guide to adopt fault-tolerant operation or protection measures in time, improve the operation stability of the charging device and inhibit the current harmonics of the power grid.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 illustrates a VIENNA rectifier, the overall circuit topology of which is shown;
FIG. 2 is a simulation waveform of a count variable and a fault location variable at a step-up ratio of 3.3;
FIG. 3 is a simulation waveform diagram of a count variable and a fault location variable at a step-up ratio of 4.57;
FIG. 4 is a schematic diagram of the logic structure of the device for on-line identification of single-tube open-circuit faults of the VIENNA rectifier;
fig. 5 is a schematic diagram showing a hardware structure of the computer device.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The entire circuit topology of the VIENNA rectifier is shown in FIG. 1. In FIG. 1, L is showna，LbAnd LcIs a sensor built in a VIENNA rectifier for acquiring a three-phase input current ik(k＝a,b,c)。Mk1(k ═ a, b, c) is the upper bridge arm switching tube of a certain phase; mk2And (k ═ a, b and c) represents a lower arm switching tube of a certain phase.
The single-tube open-circuit fault online identification of the VIENNA rectifier according to the present embodiment provides the following methods:
an online identification method for a single tube open circuit fault of a VIENNA rectifier comprises the following steps:
the instantaneous amplitude of the three-phase input current of the rectifier is obtained in real time, whether a zero-value stable region exists in the three-phase input current is judged respectively, and if the zero-value stable region exists in any phase of input current, the phase is judged to be a current zero-crossing phase. In the step, the three-phase input current is obtained in real time, whether the three-phase input current has a current zero-crossing phenomenon or not is judged in real time, once the input current of any phase has a zero-value stable region, the phase is judged to be a current zero-crossing phase, and then the current zero-crossing phase is further judged. In particular, the manner of acquiring the instantaneous amplitude of the three-phase input current can adopt a sensor in a rectifier. Specifically, when determining whether the three-phase input current has the phenomenon of current zero crossing, the following steps may be specifically adopted, for example: judging whether the instantaneous amplitude of the three-phase input current falls into a zero current detection threshold range or not; and if the instantaneous amplitude of the input current of any phase falls within the range of the zero current detection threshold, determining that the phase is a current zero-crossing phase. Specifically, the zero current detection threshold range is (-i)th，ith) Optionally, the ithThe recognition accuracy is affected, preferably with a value around 5% peak current. The three-phase bridge arms of the VIENNA rectifier are respectively set as a, b and c. i.e. ik(k ═ a, b, c) is a three-phase input current through which a three-phase input current i passesk(k ═ a, b, c) and a diagnostic threshold value i for zero current detectionthIn comparison, if phase current i is measuredkThe value of (k ═ a, b, c) is in the interval (-i)th，ith) In the range, k (k ═ a, b, c) phase input current zero-crossing is represented; otherwise, it means that the input current of phase k (k ═ a, b, c) does not cross zero.
Optionally, in order to identify the phase with zero current passing, the step of determining that the phase is the phase with zero current passing further includes: defining zero crossing flag epsilonkComprises the following steps:
wherein: i.e. ik(k ═ a, b, c) is the three-phase input current; i all right anglethDiagnostic threshold i for zero current detectionth。
When any phase is obtained as a current zero-crossing phase, further processing needs to be performed on the current zero-crossing phase, namely: and calculating the zero-value platform duration of the current zero-crossing phase within the first preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold, and if the zero-value platform duration is greater than the zero-value platform detection threshold, judging the phase as an open-circuit fault phase. In this step, the zero-value platform duration time of the current flowing through the zero phase is further calculated, so as to count the number of times of zero crossing of the current flowing through the zero phase within a first preset time period, and the zero-value platform duration time within the first preset time period is obtained by multiplying the number of times of zero crossing and a sampling period. Specifically, the count module W corresponding to the three-phase input current is setk(k ═ a, b, c) when εkWhen the current changes from 0 to 1, a counting module W corresponding to the current zero-crossing phase is startedk(k ═ a, b, c) for a first preset duration of time; within a first preset time period, if epsilonkIs 1, then WkAccumulating for 1; if epsilonkIs 0, then WkNot accumulating; calculating the duration t of the current zero-value platformkComprises the following steps:
tk＝WkTs,k＝a,b,c
wherein: t issFor a current sampling period, it may be 0.0001 s.
Counting module WkThe operation of (k ═ a, b, c) is as follows:
εkwhen changing from 0 to 1, if the counting module WkIn the dormant state, waking up WkAnd working for a first preset time.
Within a first preset time period, if epsilonkIs 1, the counting module WkAccumulating for 1; if epsilonkIs 0, the counting module WkAnd are not accumulated.
After the first preset duration, counting the module WkAnd entering a dormant state, and clearing the count. When e is sent againkWhen changing from 0 to 1, it is heavyRepeating the working mode.
Optionally, the first preset duration is a power frequency period of 1/4, such as: 0.005 s. Of course, the power frequency period with the first preset duration of 1/4 is an optimal value, and the value range thereof may be (0.004s-0.007s), and an excessive value of the first preset duration may cause a delay of the fault diagnosis time, as can be seen from the current waveform diagram shown in fig. 2, a zero-value platform appears periodically, and if the value of the first preset duration is excessive, the duration of the zero-value platform is exceeded, and W is within the exceeded timekIt is not accumulated; but t cannot be calculated because t is still within the first preset time periodkThat is, it is impossible to finally determine whether the phase is an open fault phase, which eventually results in a delay in fault diagnosis time.
The first preset duration is too small, so that the missed diagnosis is caused, because when the first preset duration is very small, the working time of the counting module is too short, the counting value is too small, and when the counting module works for the first preset duration, the counting module starts to clear and recount again to enable the duration t of the calculated zero-value platform to be tk＝WkTsK is too small to reach the failure threshold all the time, resulting in missed diagnosis.
Based on the step, whether the phase is an open-circuit fault phase or not can be finally judged, and a fault phase positioning variable m can be further defined in the step for convenience of identificationkComprises the following steps:
in the formula, tthDetermining a threshold value for the zero plateau, by the duration t of the current zero plateaukAnd zero value platform judgment threshold tthComparing to obtain a fault phase positioning variable mkValue of (d) if mkWhen 0 denotes that the k-phase switching tube is working normally, m k1 represents an open-circuit fault of the k-phase switching tube. t is tthThe value of (a) will influence the accuracy and speed of identification, and t is preferredthValues around 0.08T, such as: (0.0012s-0.0020s) t in this examplethTake 0.0016 s.
Real-time three-phase rectifierAnd converting the input current into an alpha phase current component and a beta phase current component in a two-phase stationary coordinate system, and delaying the beta phase current component for a second preset time period to enable the phases of the alpha phase current component and the beta phase current component to be consistent or opposite to each other. In the step, the three-phase input current of the rectifier is obtained in real time without any sequence, and specifically, in order to construct a variable directly representing the position of a fault switch, the [ i ] is paired through formulas (4) and (5)a,ib,ic]T，[ib,ic,ia]TAnd [ ic,ia,ib]TClark transformation is carried out to obtain [ iαa,iαb,iαc]TAnd [ iβa,iβb,iβc]T。
Based on the above transformation, i is in a two-phase stationary coordinate systemβkAdvance iαk(k is a, b, c)90 DEG, in order to make iαkAnd iβkThe change of (k ═ a, b, c) is easy to analyze, and i needs to be convertedβk(k ═ a, b, c) delay of 0.75T, i.e. let T ═ T-0.75T, at which time iαkAnd iβk(k is a, b, c) are in phase; or, iβk(k ═ a, b, c) delay 0.25T, i.e. let T ═ T-0.25T, in which case iαkAnd iβkAnd (k) is in opposite phase to (a, b, c).
When any phase is measured to be a current zero-crossing phase, the alpha-phase current component also has a zero-value platform, and because the beta-phase current component and the alpha-phase current component have the same phase or the opposite phase, the times that the amplitude of the beta-phase current component corresponding to the input current of the phase is greater than zero and less than zero are counted at the same time when any phase is measured to be the current zero-crossing phase, and the times that the amplitude of the beta-phase current component is greater than zero and the times that the amplitude of the beta-phase current component is less than zero are compared, so that the switching tube of which bridge arm on the current zero-crossing phase fails can be obtained.
When any phase is judged to be a current-through zero phase, counting the times that the amplitude of a beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time period of the phase; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase through which the current flows has a fault. In particular, the amount of the solvent to be used,
in a preferred embodiment, the step of comparing the number of times that the magnitude of the β -phase current component is greater than zero with the number of times that the magnitude of the β -phase current component is less than zero when the α -phase current component and the β -phase current component are in phase agreement comprises: if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are less than the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
In a preferred embodiment, the step of comparing the number of times the magnitude of the β -phase current component is greater than zero with the number of times less than zero when the α -phase current component and the β -phase current component are opposite in phase to each other comprises: if the times that the amplitude of the beta phase current component is larger than zero are smaller than the times that the amplitude of the beta phase current component is smaller than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
In order to facilitate statistics of the times that the amplitude of the beta-phase current component corresponding to the input current flowing through the zero phase is greater than zero and less than zero, specifically:
the upper bridge arm switch tube and the lower bridge arm switch tube of the a phase of the rectifier are respectively marked as a1、a2。
The upper bridge arm switch tube and the lower bridge arm switch tube of the b phase of the rectifier are respectively marked as b1、b2。
The upper bridge arm switch tube and the lower bridge arm switch tube of the c phase of the rectifier are respectively marked as c1、c2。
Setting counting modules W respectively corresponding to the upper bridge arm and the lower bridge arm in the three-phase bridge armβk1、Wβk2(k ═ a, b, c); when epsilonkWhen the current zero-crossing phase is 1, starting counting modules W respectively corresponding to an upper bridge arm and a lower bridge arm on the current zero-crossing phaseβk1、Wβk2Working for a first preset time; respectively counting the times that the amplitude of the beta-phase current component is greater than zero and the times that the amplitude of the beta-phase current component is less than zero within a first preset time length, and when the amplitude of the beta-phase current component is greater than zero, Wβk1Adding 1 in an accumulated way; when the amplitude of the beta phase current component is less than zero, Wβk2Adding 1 in an accumulated way; setting a switch tube diagnosis positioning variable n for comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero
When the phase of the alpha-phase current component is consistent with that of the beta-phase current component, if n is 1, the upper bridge arm of the open-circuit fault phase is in fault; if n is 0, the lower bridge arm of the open-circuit fault phase fails; when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, n is 1, the lower bridge arm of the open-circuit fault phase is in fault; and n is 0, the upper bridge arm of the open-circuit fault phase fails.
Counting module Wβk1、Wβk2The working mode is as follows:
εkwhen changing from 0 to 1, if the counting module Wβk1、Wβk2In the dormant state, the counting module W is awakenedβk1、Wβk2Starting, working within a first preset time period, and when the amplitude of the beta phase current component is greater than zero, Wβk1Adding 1 in an accumulated way; when the amplitude of the beta phase current component is less than zero, Wβk2Add 1 cumulatively.
After the first preset duration, starting to compare Wβk1、Wβk2The accumulated value of the voltage and current values is used for judging which bridge arm has a fault in the switching tube.
After comparison, the module W is countedβk1、Wβk2Entering a dormant state, and clearing the count.
The technical scheme provided by the application is based on a current sensor of the VIENNA rectifier, whether the zero-crossing phenomenon exists in three-phase input current is monitored in real time, and when the zero-crossing phenomenon exists in any phase, the zero-value platform duration time of the current zero-crossing phase in a first preset time length is acquired and compared with a zero-value platform detection threshold value to determine whether the phase has the open-circuit fault.
In addition, when the three-phase input current is monitored in real time, the method also carries out real-time transformation on the three-phase input current so as to obtain an alpha-phase current component and a beta-phase current component under a two-phase static coordinate system after transformation, when any phase is measured to be a current zero-crossing phase, the alpha-phase current component also has a zero-value platform, and in view of the fact that the beta-phase current component and the alpha-phase current component are in the same phase or in the opposite phase, the times that the amplitude of the beta-phase current component corresponding to the phase input current is greater than zero and less than zero are counted at the same time when any phase is measured to be the same time when the current passes through the zero-crossing phase, and the times that the amplitude of the beta-phase current component is greater than zero and the times that the amplitude of the beta-phase current component is less than zero are compared, so that which bridge arm on the zero-phase the current is failed can be obtained.
Based on the above online identification process, after a zero-value stable region occurs, on one hand, whether the current zero-crossing phase has an open-circuit fault or not is detected, and at the same time, on the other hand, the switching tube of which bridge arm on the zero-crossing phase the current flows is also detected to have a fault. Under the simultaneous judgment of the two aspects, if the current zero-crossing phase has an open-circuit fault, the current zero-crossing phase can quickly and timely diagnose the open-circuit fault phase and which bridge arm switch has the fault at the same time. According to the technical scheme provided by the embodiment, on one hand, online identification of the single-tube open-circuit fault of the VIENNA rectifier can be realized only by correspondingly processing and analyzing three-phase input current without adding an additional sensor or changing hardware; on the other hand, when the open-circuit fault phase and the switching tube of the bridge arm on the open-circuit fault phase are judged to have a fault, synchronous statistics is carried out simultaneously within a first preset time length, so that rapid and efficient diagnosis can be realized; on the other hand, the online identification method provided by the application has the advantages that the operation process is simple, the first preset time and the related threshold are simple and convenient to set, and only the diagnosis threshold of zero current detection and the zero-value platform judgment threshold need to be designed. Compared with the diagnosis method in the prior art, or the algorithm is complex and has large calculation amount; or an additional sensor needs to be added, the method can guide to adopt fault-tolerant operation or protection measures in time, improve the operation stability of the charging device and inhibit the current harmonics of the power grid.
More importantly, whether the open-circuit fault phase and the switching tube of which bridge arm have faults are judged simultaneously, and the judgment time duration is the first preset time duration, so that synchronous judgment can be realized simultaneously. Positioning variable m based on fault phasekAnd designing a switch tube diagnosis positioning variable n, only when mkWhen the value is 1, the value of the switch tube diagnosis positioning variable n has meaning; when m iskWhen the value of the positioning variable n is 0, the value of the switch tube diagnosis positioning variable n is invalid, and by the design, when the open-circuit fault is found not to occur after the current is judged to pass through the zero phase, the misjudgment is avoided, so that the reliability and the timeliness of the method can coexist.
In a working scenario, selecting the relevant parameters of the VIENNA rectifier includes: the output voltage of the direct current side is 100V; the filter inductance is 2 mH; the switching frequency is 20 kHz; a direct current side capacitor 680 uF; output power 166.67W; the input voltage is determined according to a boosting ratio (the boosting ratio is equal to the effective value of the output voltage on the direct current side/the input voltage on the alternating current side), and if the boosting ratio is selected: 3.3 and 4.57.
When a single-tube open-circuit fault occurs at 0.1401s (the fault trigger angle is 0 °), referring to the simulation waveform diagram of the count variable and the fault location variable with a voltage boosting ratio of 3.3 shown in fig. 2, when the simulation waveform diagram is converted into a two-phase static coordinate system, iβk(k ═ a, b, c) delay 0.75T, which is associated with iαkIn phase. When the above steps are executed to the time of fault occurrence, during fault identification, namely: the current zero crossing phase is detected, W in the graphaShown is that phase a begins counting the number of zero crossings, i.e.: a phase current flows through zero phase based on WaAnd TsCalculating the continuous application time of the phase-a zero value platform as follows:
tk＝WkTs,k＝a,b,c
in the figure, the fault phase location variable maThe signal is 1, so that it is known that the switching tube of the a-phase is failed.
Also, as can be seen in FIG. 2, Wβ1Greater than Wβ2Therefore, the switch tube diagnosis positioning variable n is 1, and the upper bridge arm fault of the open-circuit fault phase is also as follows: and the switching tube on the upper bridge arm of the phase a has an open-circuit fault.
When a single-tube open-circuit fault occurs at 0.1401s (the fault trigger angle is 0 °), referring to the simulation waveform diagram of the counting variable and the fault locating variable with the voltage boosting ratio of 4.57 shown in fig. 3, when the simulation waveform diagram is converted into a two-phase static coordinate system, iβk(k ═ a, b, c) delay 0.75T, which is associated with iαkIn phase. When the steps are executed to the moment of fault occurrence, during fault identification, namely: the current zero crossing phase is detected, W in the graphaShown is that phase a begins counting the number of zero crossings, i.e.: a phase current flows through zero phase based on WaAnd TsCalculating the continuous application time of the phase-a zero value platform as follows:
tk＝WkTs,k＝a,b,c
in the figure, the fault phase location variable maThe signal is shown as 1, so that it is known that the switching tube failure occurs in the a-phase.
At the same time, W can also be seen in FIG. 3β1Greater than Wβ2Therefore, the switch tube diagnosis positioning variable n is 1, and the upper bridge arm fault of the open-circuit fault phase is also as follows: and the switching tube on the upper bridge arm of the phase a has an open-circuit fault.
By combining the specific application scenarios, the online identification method provided by the embodiment can reliably and timely identify the single-tube open-circuit fault of the VIENNA rectifier, and is very suitable for popularization and application.
The present application further provides a specific implementation of an apparatus for online identification of single-tube open-circuit faults of a VIENNA rectifier, including:
and the current flowing through zero-phase judgment module is used for acquiring the instantaneous amplitude of the three-phase input current of the rectifier in real time and respectively judging whether the three-phase input current has a zero-value stable region, and if the zero-value stable region exists in the input current of any phase, the phase is judged to be a current zero-crossing phase.
And the open-circuit fault phase judgment module is used for calculating the zero-value platform duration of the current zero-crossing phase within the first preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold value, and judging the phase as an open-circuit fault phase if the zero-value platform detection threshold value is greater than the zero-value platform detection threshold value.
And the current transformation module is used for transforming the three-phase input current of the rectifier to the alpha-phase current component and the beta-phase current component in the two-phase static coordinate system in real time, and delaying the beta-phase current component for a second preset time so that the phases of the alpha-phase current component and the beta-phase current component are consistent or reciprocal.
The switching tube fault side judging module starts to count the times that the amplitude of a beta phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time length of any phase when the phase is judged to be a zero-phase through which the current flows; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase has a fault.
Referring to the schematic diagram of the logical structure of the device for on-line identification of single-tube open-circuit faults of the VIENNA rectifier shown in fig. 4, based on the above method, the current-passing zero-phase judgment module, the open-circuit fault-phase judgment module, the current transformation module and the switching tube fault-side judgment module are used to respectively implement corresponding functions, so that the on-line identification method can be made into a transferable device, and can be conveniently built in the existing application scene using the VIENNA rectifier.
The present application further provides a computer device, the device comprising: a memory for storing executable program code; one or more processors configured to read executable program code stored in the memory to perform the method for on-line identification of a VIENNA rectifier single tube open circuit fault as described above. Please refer to fig. 5, which shows a hardware structure diagram of the computer device.
The computer system includes a Central Processing Unit (CPU)501, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM)502 or a program loaded from a storage section into a Random Access Memory (RAM) 503. In the RAM503, various programs and data necessary for system operation are also stored. The CPU 501, ROM 502, and RAM503 are connected to each other via a bus 504. An input/output (I/O) interface 505 is also connected to bus 504.
The following components are connected to the I/O interface 505: an input portion 506 including a keyboard, a mouse, and the like; an output section including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage portion 508 including a hard disk and the like; and a communication section 509 including a network interface card such as a LAN card, a modem, or the like. The communication section 509 performs communication processing via a network such as the internet. The drives are also connected to the I/O interface 505 as needed. A removable medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 510 as necessary, so that a computer program read out therefrom is mounted into the storage section 508 as necessary.
In particular, the process described above for the method for on-line identification of a VIENNA rectifier single-tube open fault may be implemented as a computer software program according to an embodiment of the present invention. For example, embodiments of the present invention related to a method for online identification of a VIENNA rectifier monotube open circuit fault include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method illustrated in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network via the communication section, and/or installed from a removable medium. The computer program performs the above-described functions defined in the system of the present application when executed by the Central Processing Unit (CPU) 501.
It should be noted that the computer readable medium shown in the present invention can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In the present invention, however, a computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of various methods, apparatus, and computer program products for online identification of VIENNA rectifier single tube open faults according to the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. 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 involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves. The described units or modules may also be provided in a processor, and may be described as: a processor comprises a first generation module, an acquisition module, a search module, a second generation module and a merging module. Wherein the designation of such a unit or module does not in some way constitute a limitation on the unit or module itself.
As another aspect, the present application also provides a computer-readable medium, which may be contained in the electronic device described in the above embodiment; or may exist separately without being assembled into the electronic device. The computer readable medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device implements the online identification method for single-tube open-circuit fault of the VIENNA rectifier as described in the above embodiments.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. An online identification method for a single tube open circuit fault of a VIENNA rectifier is characterized by comprising the following steps:
acquiring instantaneous amplitude values of three-phase input currents of the rectifier in real time, respectively judging whether the three-phase input currents have zero-value stable regions, and if any phase of input current has the zero-value stable region, judging that the phase is a current zero-crossing phase;
calculating the zero-value platform duration of the current zero-crossing phase within a first preset time length, comparing the zero-value platform duration with a zero-value platform detection threshold, and if the zero-value platform duration is greater than the zero-value platform detection threshold, judging the phase as an open-circuit fault phase;
converting three-phase input current of the rectifier into alpha-phase current component and beta-phase current component under a two-phase static coordinate system in real time, and delaying the beta-phase current component for a second preset time period to enable the phases of the alpha-phase current component and the beta-phase current component to be consistent or reciprocal;
when any phase is judged to be a current-through zero phase, counting the times that the amplitude of a beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time period of the phase; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase through which the current flows has a fault.
2. The on-line identification method for the single tube open fault of the VIENNA rectifier according to claim 1, wherein the method comprises the following steps:
the step of judging whether the three-phase input current has a zero-value stable region or not comprises the following steps: judging whether the instantaneous amplitude of the three-phase input current falls into a zero current detection threshold range or not; and if the instantaneous amplitude of the input current of any phase falls within the range of the zero current detection threshold, determining that the phase is a current zero-crossing phase.
3. The on-line identification method for the single tube open fault of the VIENNA rectifier according to claim 1 or 2, wherein the method comprises the following steps:
when the phases of the alpha-phase current component and the beta-phase current component are consistent, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps:
if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are less than the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
4. The on-line identification method for the single tube open fault of the VIENNA rectifier according to claim 1 or 2, characterized in that:
when the phases of the alpha-phase current component and the beta-phase current component are opposite to each other, the step of comparing the times that the amplitude of the beta-phase current component is greater than zero with the times that the amplitude of the beta-phase current component is less than zero comprises the following steps:
if the times that the amplitude of the beta phase current component is larger than zero are smaller than the times that the amplitude of the beta phase current component is smaller than zero, judging that the upper bridge arm of the current passing through the zero phase has a fault; and if the times that the amplitude of the beta phase current component is greater than zero are greater than or equal to the times that the amplitude of the beta phase current component is less than zero, judging that the lower bridge arm of the current passing through the zero phase has a fault.
5. The on-line identification method for the single tube open fault of the VIENNA rectifier according to claim 2, wherein the method comprises the following steps:
the step of determining that the phase is a current zero-crossing phase further comprises: defining zero crossing flag epsilonkComprises the following steps:
wherein: i.e. ik(k ═ a, b, c) is the three-phase input current; i.e. ithDiagnostic threshold i for zero current detectionth。
6. The on-line identification method for the single tube open fault of the VIENNA rectifier according to claim 5, wherein the method comprises the following steps:
the method comprises the following steps of calculating the zero-value plateau duration of the current zero-crossing phase within a first preset time duration, wherein the steps comprise: setting a counting module W corresponding to a three-phase input currentk(k ═ a, b, c) when εkWhen the current changes from 0 to 1, a counting module W corresponding to the current zero-crossing phase is startedk(k ═ a, b, c) for a first preset duration of time; within a first preset time period, if epsilonkIs 1, then WkAccumulating for 1; if epsilonkIs 0, then WkNot accumulating; calculating the duration t of the current zero-value platformkComprises the following steps:
tk＝WkTs,k＝a,b,c
wherein: t issIs the current sampling period.
7. The on-line identification method for the single tube open fault of the VIENNA rectifier according to claim 5, wherein the method comprises the following steps:
when any phase is judged to be a zero-current-flowing phase, counting the times that the amplitude of a beta-phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time period of the phase, wherein the times comprises the following steps:
setting counting modules W respectively corresponding to the upper bridge arm and the lower bridge arm in the three-phase bridge armβk1、Wβk2(k ═ a, b, c); when epsilonkWhen the current zero-crossing phase is 1, starting counting modules W respectively corresponding to an upper bridge arm and a lower bridge arm on the current zero-crossing phaseβk1、Wβk2Working for a first preset time;
respectively counting the times that the amplitude of the beta-phase current component is greater than zero and the times that the amplitude of the beta-phase current component is less than zero within a first preset time length, and when the amplitude of the beta-phase current component is greater than zero, Wβk1Adding 1 cumulatively; when the amplitude of the beta phase current component is less than zero, Wβk2Adding 1 cumulatively;
setting a switch tube diagnosis positioning variable n for comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero
When the phase of the alpha phase current component is consistent with that of the beta phase current component, if n is 1, the current passes through the upper bridge arm of the zero phase and fails; if n is 0, the lower bridge arm of the current zero-crossing phase fails;
when the phase of the alpha-phase current component and the phase of the beta-phase current component are opposite to each other, n is 1, and the lower bridge arm of the current zero-crossing phase fails; and n is 0, the current passes through the upper bridge arm of the zero phase to cause a fault.
8. A device for VIENNA rectifier single tube open circuit fault on-line identification is characterized in that: the method comprises the following steps:
the current passing zero-phase judgment module is used for acquiring the instantaneous amplitude of the three-phase input current of the rectifier in real time and respectively judging whether the three-phase input current has a zero-value stable region, and if the input current of any phase has the zero-value stable region, judging the phase as a current zero-crossing phase;
the open-circuit fault phase judgment module is used for calculating the zero-value platform duration time of the current zero-crossing phase within the first preset time length, comparing the zero-value platform duration time with a zero-value platform detection threshold value, and judging the phase as an open-circuit fault phase if the zero-value platform detection threshold value is greater than the zero-value platform detection threshold value;
the current transformation module is used for transforming the three-phase input current of the rectifier to an alpha-phase current component and a beta-phase current component in a two-phase stationary coordinate system in real time, and delaying the beta-phase current component for a second preset time so that the phases of the alpha-phase current component and the beta-phase current component are consistent or reciprocal;
the switching tube fault side judging module starts to count the times that the amplitude of a beta phase current component corresponding to the zero crossing of the current is greater than zero and less than zero within a first preset time length of any phase when the phase is judged to be a zero-phase through which the current flows; and comparing the times that the amplitude of the beta phase current component is greater than zero with the times that the amplitude of the beta phase current component is less than zero, and judging which bridge arm switching tube on the zero phase through which the current flows has a fault.
9. A computer device, the device comprising: a memory for storing executable program code; one or more processors configured to read executable program code stored in the memory to perform the method for single-tube open circuit fault online identification of a VIENNA rectifier of any one of claims 1 to 7.
10. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method for online identification of a VIENNA rectifier single tube open fault as claimed in any one of claims 1 to 7.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113156336B (en) | 2022-06-24 |
| CN113156336A (en) | 2021-07-23 |
| CN113156337A (en) | 2021-07-23 |
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