CN110275082A - A kind of ground connection diagnostic method, system and the device of main circuit of converter - Google Patents
A kind of ground connection diagnostic method, system and the device of main circuit of converter Download PDFInfo
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- CN110275082A CN110275082A CN201810219013.6A CN201810219013A CN110275082A CN 110275082 A CN110275082 A CN 110275082A CN 201810219013 A CN201810219013 A CN 201810219013A CN 110275082 A CN110275082 A CN 110275082A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
This application discloses ground connection diagnostic method, system and the devices of a kind of main circuit of converter, comprising: obtains middle DC voltage, input voltage and the output voltage of main circuit of converter, and extracts the AC compounent of middle DC voltage；Judge whether AC compounent reaches operation exchange value；If it is not, determining that the earth fault of main circuit of converter is located at the busbar of main circuit of converter；If so, judging whether middle DC voltage meets electric voltage exception condition；If so, determining that earth fault is located at the load-side of main circuit of converter；If it is not, determining that earth fault is located at the rectification side or inverter side of main circuit of converter.The application is by determining whether AC compounent reaches operation exchange value and whether middle voltage meets electric voltage exception condition, can accurately determine the position of earth fault；And the application can ignore the burr data influence of sensor based on overall data, improve the confidence level and accuracy of judgement, hence it is evident that be better than the prior art.
Description
Technical field
The present invention relates to a kind of diagnosis of the ground connection of fault of electric locomotive detection technique field more particularly to main circuit of converter
Method, system and device.
Background technique
Electric locomotive electric drive system has the characteristics that high voltage, high current, hereby it is ensured that the normal work of transmission system
It is to ensure that the premise of locomotive reliability service.Locomotive may cause main electricity due to cable aging, vibration friction etc. during utilization
Road is grounded, although usually any ground connection does not have too much influence to the normal work of system, when there are two o'clock or
When multipoint earthing, then there may be very big short circuit current, the scaling loss of electric drive for locomotive system unit is caused, under serious conditions very
It is broken to the machine that will lead to.Therefore, judgement accurately and rapidly is carried out to ground fault and processing is still extremely important and necessary
's.
Current transformer is a ring important in electric drive system, and possible grounding point is divided into following four classes: rectification side input terminal
Ground connection, the positive and negative bus-bar earthing of intermediate dc, inversion outlet side ground connection and load-side ground connection.Some inspections are proposed in the prior art
The method for surveying grounding point, but deterministic process is simple, testing result is not accurate enough.Such as patent CN201210101387.0 is proposed
It is a kind of to be used for locomotive accessory power supply ground detection device, carrying ground is judged by the detection of earth current, the earthing detection
Method cannot be distinguished inversion outlet side ground connection and be grounded with load-side；And Co., Ltd, Dalian Locomotive Inst. Wang Bin et al. writes
Paper " detection and analysis of electric locomotive auxiliary converter system ground fault " in existing AuCT be grounded judgment mode
It carries out emulation to verify with ground experiment, judgment mode is too simple, when there are be easy to appear when burr interference for voltage sensor
Wrong report.
Therefore, how a kind of scheme solving above-mentioned technical problem is provided, is that those skilled in the art need to solve at present
The problem of.
Summary of the invention
In view of this, the purpose of the present invention is to provide ground connection diagnostic method, system and the dresses of a kind of main circuit of converter
It sets, so as to the position of accurate judgement earth fault.Its concrete scheme is as follows:
A kind of ground connection diagnostic method of main circuit of converter, comprising:
Middle DC voltage, input voltage and the output voltage of the main circuit of converter are obtained, and extracts described half
The AC compounent of middle dc voltage；
Judge whether the AC compounent reaches operation exchange value；If it is not, then determining connecing for the main circuit of converter
Earth fault point is located at the busbar of the main circuit of converter；If it is, judging whether the middle DC voltage meets electricity
Press exceptional condition；
If it is, determining that the earth fault is located at the load-side of the main circuit of converter；If not, according to institute
Voltage magnitude ratio of the AC compounent respectively with the input voltage, the output voltage is stated, determines the ground fault point
In the rectification side or inverter side of the main circuit of converter.
Preferably, the ground connection diagnostic method further include:
When the earth fault is located at the load-side or inverter side of the main circuit of converter, the AC compounent is calculated
With the voltage phase difference of the output voltage, target phase is determined according to the voltage phase difference；Wherein the target is mutually three-phase
Described in circuit phase where earth fault.
Preferably, the main circuit of converter includes first resistor and second resistance, the first termination of the first resistor
Positive busbar, the first termination negative busbar of the second resistance, the second of the second end of the first resistor and the second resistance
End is grounded after being connected, and the middle DC voltage is the measurement voltage of the first resistor.
Preferably, the earth fault for determining the main circuit of converter is located at the busbar of the main circuit of converter
Later, further includes:
When the middle DC voltage be less than first threshold, determine that the earth fault is located at the positive busbar；
When the middle DC voltage be greater than second threshold, determine that the earth fault is located at the negative busbar.
Preferably, described according to the AC compounent voltage magnitude with the input voltage, the output voltage respectively
Ratio determines that the earth fault is located at the rectification side of the main circuit of converter or the process of inverter side, specifically includes:
Calculate separately first voltage amplitude proportion, the AC compounent and the institute of the AC compounent and the input voltage
State the second voltage amplitude proportion of output voltage；
When the first voltage amplitude proportion is located at first amplitude section, then determine that the earth fault is located at the change
Flow the rectification side of device main circuit；
When the second voltage amplitude proportion is located at the second amplitude section, then determine that the earth fault is located at the change
Flow the inverter side of device main circuit；
Wherein, the first amplitude section is with second amplitude section according to the resistance of the first resistor and second resistance
Value obtains.
Preferably, described to be located at first amplitude section when the first voltage amplitude proportion, then determine the ground fault
Point is located at after the rectification side of the main circuit of converter, further includes:
Calculate the voltage phase difference of the input voltage Yu the AC compounent；
When the voltage phase difference is located at the first phase angle difference section, determine that the earth fault is being located at the rectification side just
End；
When the voltage phase difference is located at the second phase angle difference section, it is negative to determine that the earth fault is located at the rectification side
End；
Wherein, first phase angle difference section is to allow section, second phase with 180 ° of phase angle errors for midpoint
Angular difference section is to allow section with 0 ° of phase angle error for midpoint.
Preferably, the load-side that the main circuit of converter is located at when the earth fault, calculates the exchange
The voltage phase difference of component and the output voltage determines the process of target phase according to the voltage phase difference, specifically includes:
Calculate separately the three-phase voltage of the output voltage and the voltage phase difference of the AC compounent；
Determine that being located at the corresponding circuit of voltage phase difference in first phase angle difference section is mutually target phase.
Preferably, the inverter side that the main circuit of converter is located at when the earth fault, calculates the exchange
The voltage phase difference of component and the output voltage determines the process of target phase according to the voltage phase difference, specifically includes:
Calculate separately the three-phase voltage of the output voltage and the voltage phase difference of the AC compounent；
Determine that being located at the corresponding circuit of voltage phase difference in third phase angular difference section is mutually target phase；
Wherein, third phase angle difference section is with 180 ° of phase angle sections for midpoint.
Preferably, the electric voltage exception condition are as follows:
The middle DC voltage abnormal ranges accounting is greater than third threshold value in monocycle.
Preferably, the electric voltage exception condition are as follows:
The abnormality decision value of the middle DC voltage exceeds the 4th threshold value；Wherein the abnormality decision value is described half
Middle dc voltage presets the corresponding numerical value of decision probability within the monocycle.
Correspondingly, the invention also discloses a kind of ground connection diagnostic systems of main circuit of converter, comprising:
Data acquisition module, for obtaining middle DC voltage, input voltage and the output of the main circuit of converter
Voltage, and extract the AC compounent of the middle DC voltage；
First judgment module, for judging whether the AC compounent reaches operation exchange value；If it is not, then described in determining
The earth fault of main circuit of converter is located at the busbar of the main circuit of converter；If it is, the second judgment module of triggering；
Second judgment module, for judging whether the middle DC voltage meets electric voltage exception condition；If
It is then to determine that the earth fault is located at the load-side of the main circuit of converter；If not, according to the AC compounent point
Not with the voltage magnitude ratio of the input voltage, the output voltage, determine that the earth fault is located at the current transformer
The rectification side or inverter side of main circuit.
Correspondingly, the invention also discloses a kind of ground connection diagnostic devices of main circuit of converter, comprising:
Memory, for storing computer program；
Processor realizes that the main circuit of converter as described in any one of above connects when for executing the computer program
The step of ground diagnostic method.
The invention discloses a kind of ground connection diagnostic methods of main circuit of converter, comprising: obtains the main circuit of converter
Middle DC voltage, input voltage and output voltage, and extract the AC compounent of the middle DC voltage；Judge institute
State whether AC compounent reaches operation exchange value；If it is not, then determining that the earth fault of the main circuit of converter is located at institute
State the busbar of main circuit of converter；If it is, judging whether the middle DC voltage meets electric voltage exception condition；If
It is then to determine that the earth fault is located at the load-side of the main circuit of converter；If not, according to the AC compounent point
Not with the voltage magnitude ratio of the input voltage, the output voltage, determine that the earth fault is located at the current transformer
The rectification side or inverter side of main circuit.The present invention is extracted the AC compounent in the DC voltage of middle, due to earth fault
The feature of middle DC voltage is different when the difference of position, therefore by determining whether AC compounent reaches operation exchange value
And whether middle voltage meets electric voltage exception condition, features described above can be distinguished, to accurately determine ground connection
The position of fault point；And the data length obtained during diagnosis is generally monocycle or multicycle, and diagnosis basis is whole
Based on data, the burr data influence of sensor can be ignored, improve the confidence level and accuracy of judgement, hence it is evident that better than existing
Technology.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of step flow chart of the ground connection diagnostic method of main circuit of converter in the embodiment of the present invention；
Fig. 2 is a kind of structural topology figure of main circuit of converter in the embodiment of the present invention；
Fig. 3 is a kind of structural topology figure for the main circuit of converter for installing voltage sensor additional in the embodiment of the present invention；
Fig. 4 a is a kind of ground connection waveform diagram of earth fault in the embodiment of the present invention；
Fig. 4 b is a kind of ground connection waveform diagram of earth fault in the embodiment of the present invention；
Fig. 5 is a kind of ground connection waveform diagram of earth fault in the embodiment of the present invention；
Fig. 6 is a kind of ground connection waveform diagram of earth fault in the embodiment of the present invention；
Fig. 7 is a kind of structure distribution figure of the ground connection diagnostic system of main circuit of converter in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is shown in Figure 1 the embodiment of the invention discloses a kind of ground connection diagnostic method of main circuit of converter, comprising:
S1: middle DC voltage, input voltage and the output voltage of the main circuit of converter are obtained, and described in extraction
The AC compounent of middle DC voltage；
It is understood that the input voltage of main circuit of converter, the voltage usually measured in rectification side；Current transformer master
The output voltage of circuit is the three-phase voltage of entire main circuit of converter output, generally by main circuit of converter output end with
The place of load connection measures.
Wherein, middle DC voltage is the transition interval in rectifier and inverter, is connected by endpoint of two busbars
Two or more resistance, there are a grounding point in the series resistance, the voltage that a part measurement of its series resistance is obtained.
The structural topology figure of a kind of current transformer major loop shown in Figure 2, wherein denoting the ground connection event being likely to occur
Hinder point, earth fault 1,2 is located at the rectification side of main circuit of converter, and earth fault 3,4 is located at the mother of main circuit of converter
Row, earth fault 5,6,7 are located at the inverter side three-phase line of main circuit of converter, and earth fault 8,9,10 is located at current transformer
The load-side three-phase line of main circuit.
It is understood that the functional circuitry module in Fig. 2 could alternatively be other circuit modules of congenerous, such as
Use the capacitor and inductor filter module etc. of the different modes of connection.
S2: judge whether the AC compounent reaches operation exchange value；
Wherein, according to the judging result of this step, step S3 or step S4 is executed.
It is understood that the AC compounent of middle DC voltage is almost nil when earth fault is located at busbar,
In view of measurement error, the operation exchange value for judgement is preset, that is, if AC compounent not up to runs exchange value,
Think that fault ground point is located at busbar.
S3: if it is not, then determining that the earth fault of the main circuit of converter is located at the mother of the main circuit of converter
Row；
S4: if it is, judging whether the middle DC voltage meets electric voltage exception condition；
Wherein, according to the judging result of this step, step S5 or step S6 is executed.
It is understood that fault ground point is located at load-side namely load-side is grounded when being grounded with other positions not
Same to be characterized in that, middle DC voltage itself will appear exception when load-side is grounded, and cause the voltage value of measurement beyond just
The range of normal middle DC voltage, and middle DC voltage is always situated in normal voltage range when other positions ground connection
It is interior.
Therefore, judge whether the above voltage value exceeds normal voltage model by setting electric voltage exception condition
It encloses, generally there is following three kinds of methods:
First is that the abnormal ranges accounting that middle DC voltage in the monocycle exceeds normal range (NR) is calculated, the electric voltage exception
Condition are as follows: the middle DC voltage abnormal ranges accounting is greater than a certain given threshold in the monocycle, generally sets the threshold value
It is 10%.
Second is that judging whether the maximum value of middle DC voltage exceeds the maximum value of normal range (NR), if exceeded, recognize
To meet electric voltage exception condition；
Third is that judging the abnormality decision value of middle DC voltage beyond a certain given threshold；The wherein abnormality decision value
The corresponding numerical value of decision probability is preset within the monocycle for the middle DC voltage, the general default decision probability is
95%.
Certainly, for the setting of electric voltage exception condition, there can also be other setting rules, herein with no restriction.
S5: if it is, determining that the earth fault is located at the load-side of the main circuit of converter；
S6: if not, according to the AC compounent voltage magnitude ratio with the input voltage, the output voltage respectively
Example, determines that the earth fault is located at the rectification side or inverter side of the main circuit of converter.
It is understood that when earth fault is located at rectification side and is located at inverter side, corresponding different voltage magnitude ratio
Example carries out more detailed discriminatory analysis to ground fault point accordingly, and details are not described herein again.
Further, since rectification side and inverter side have three-phase circuit, which is located in concrete analysis earth fault
It can also specifically be analyzed according to the following steps when phase:
The voltage phase difference for calculating the AC compounent Yu the output voltage determines target according to the voltage phase difference
Phase；Wherein the target is mutually the circuit phase where earth fault described in three-phase.
The invention discloses a kind of ground connection diagnostic methods of main circuit of converter, comprising: obtains the main circuit of converter
Middle DC voltage, input voltage and output voltage, and extract the AC compounent of the middle DC voltage；Judge institute
State whether AC compounent reaches operation exchange value；If it is not, then determining that the earth fault of the main circuit of converter is located at institute
State the busbar of main circuit of converter；If it is, judging whether the middle DC voltage meets electric voltage exception condition；If
It is then to determine that the earth fault is located at the load-side of the main circuit of converter；If not, according to the AC compounent point
Not with the voltage magnitude ratio of the input voltage, the output voltage, determine that the earth fault is located at the current transformer
The rectification side or inverter side of main circuit.The present invention is extracted the AC compounent in the DC voltage of middle, due to earth fault
The feature of middle DC voltage is different when the difference of position, therefore by determining whether AC compounent reaches operation exchange value
And whether middle voltage meets electric voltage exception condition, features described above can be distinguished, to accurately determine ground connection
The position of fault point；And the data length obtained during diagnosis is generally monocycle or multicycle, and diagnosis basis is whole
Based on data, the burr data influence of sensor can be ignored, improve the confidence level and accuracy of judgement, hence it is evident that better than existing
Technology.
The embodiment of the invention discloses a kind of ground connection diagnostic methods of specific main circuit of converter, implement relative to upper one
Example, the present embodiment have made further instruction and optimization to technical solution.It is specific:
The main circuit of converter includes first resistor and second resistance, and the first of the first resistor terminates positive busbar,
First termination negative busbar of the second resistance, after the second end of the first resistor is connected with the second end of the second resistance
Ground connection, the middle DC voltage are the measurement voltage of the first resistor.
As shown in Figure 3, based on Fig. 2, multiple voltage sensors have been connect in the main circuit of converter of Fig. 2, respectively
Acquire input voltage US, middle DC voltage Ud-half, middle dc voltage UdAnd the line voltage U of output voltageabAnd Ubc。
It is understood that according to the line voltage U of output voltageabAnd Ubc, can obtain Uca=-(Uab+Ubc), further
The phase voltage of output voltage:
It, can be according to the big of middle DC voltage due to the measurement source of concrete regulation middle DC voltage
It is small positive and negative to ground fault point progress more accurately judgement.
The feature of middle DC voltage when Fig. 4 a, Fig. 4 b, Fig. 5, Fig. 6 illustrate grounding fault point position difference,
Middle Fig. 4 a and Fig. 4 b is respectively the voltage waveform that earth fault is located at 1 point of rectification side anode and 2 points of negative terminal, and Fig. 5 is ground connection event
Barrier point is located at 5 points of inverter side output end of voltage waveform, and Fig. 6 is the voltage wave that earth fault is located at 8 points of load-side output end
Shape.According to the voltage waveform feature in figure, judgement in detail below is carried out.
Specifically, AC compounent is not up to the operation exchange value in step S3, connecing for the main circuit of converter is determined
Earth fault point is located at after the busbar of the main circuit of converter, further includes:
When the middle DC voltage be less than first threshold, determine that the earth fault is located at the positive busbar,
That is fault ground point 3.
When the middle DC voltage be greater than second threshold, determine that the earth fault is located at the negative busbar,
That is fault ground point 4.
Wherein, first threshold and second threshold are generally 10%UdAnd 90%Ud。
Further, described in step S6 according to the AC compounent respectively with the input voltage, the output voltage
Voltage magnitude ratio, determine that the earth fault is located at the rectification side of the main circuit of converter or the process of inverter side,
It specifically includes:
Calculate separately first voltage amplitude proportion, the AC compounent and the institute of the AC compounent and the input voltage
State the second voltage amplitude proportion of output voltage；
When the first voltage amplitude proportion is located at first amplitude section, then determine that the earth fault is located at the change
Flow the rectification side of device main circuit；
When the second voltage amplitude proportion is located at the second amplitude section, then determine that the earth fault is located at the change
Flow the inverter side of device main circuit；
Wherein, the first amplitude section is with second amplitude section according to the resistance of the first resistor and second resistance
Value obtains.
General setting first resistor is identical with the resistance value of second resistance, theoretically if earth fault is located at rectification side,
Then first voltage amplitude proportion is 1:2, if earth fault is located at inverter side, second voltage amplitude proportion is 1:1, is considered
To all kinds of errors, it is the burst error with 0.5 for midpoint, setting that the corresponding first amplitude section of first voltage amplitude proportion, which is arranged,
Second voltage amplitude proportion corresponding second amplitude section is the burst error with 1 for midpoint.
Further, described to be located at first amplitude section when the first voltage amplitude proportion, then determine that the ground connection is former
Barrier point is located at after the rectification side of the main circuit of converter, further includes:
Calculate the voltage phase difference of the input voltage Yu the AC compounent；
When the voltage phase difference is located at the first phase angle difference section, determine that the earth fault is being located at the rectification side just
End；
When the voltage phase difference is located at the second phase angle difference section, it is negative to determine that the earth fault is located at the rectification side
End；
Wherein, first phase angle difference section is to allow section, second phase with 180 ° of phase angle errors for midpoint
Angular difference section is to allow section with 0 ° of phase angle error for midpoint.
In general, the first phase angle difference section is 180 ° ± 10 °, the second phase angle difference section is 0 ° ± 10 °.
It is understood that above-mentioned judgement is all input electricity when ground fault occurring according to practical rectification side anode and negative terminal
What the feature of pressure and AC compounent was designed.
Further, the load-side that the main circuit of converter is located at when the earth fault, calculates the friendship
The voltage phase difference of flow component and the output voltage determines the process of target phase according to the voltage phase difference, specifically includes:
Calculate separately the three-phase voltage of the output voltage and the voltage phase difference of the AC compounent；
Determine that being located at the corresponding circuit of voltage phase difference in first phase angle difference section is mutually target phase.
It is understood that the three-phase voltage of output voltage is respectively a phase, b phase and c phase, each phase voltage is calculated separately
With the voltage phase difference of AC compounent, the phase is determined if which corresponding voltage phase difference is located at the first phase angle difference section
For target phase.
Further, the inverter side that the main circuit of converter is located at when the earth fault, calculates the friendship
The voltage phase difference of flow component and the output voltage determines the process of target phase according to the voltage phase difference, specifically includes:
Calculate separately the three-phase voltage of the output voltage and the voltage phase difference of the AC compounent；
Determine that being located at the corresponding circuit of voltage phase difference in third phase angular difference section is mutually target phase；
Wherein, third phase angle difference section is with 180 ° of phase angle sections for midpoint.
It is similar with load-side target is judged, but had a certain amount of when inverter side ground fault due to filter inductance
Angle offset, so that the length in third phase angle difference section is greater than the first phase angle difference section, it is general 180 ° ± 50 ° desirable.
It has been determined that a kind of measurement position of specific middle DC voltage may be used also in addition to the present embodiment in the present embodiment
To obtain middle DC voltage by other measurement positions, such as the voltage waveform of second resistance in the present embodiment is obtained,
Or connect and other resistance and carry out the measurement etc. of its voltage, thinking is similar with the present embodiment, is referred to the thin of the present embodiment
Save further refinement scheme.
Correspondingly, the embodiment of the invention also discloses a kind of ground connection diagnostic system of main circuit of converter, referring to Fig. 7 institute
Show, comprising:
Data acquisition module 01, for obtaining the middle DC voltage of the main circuit of converter, input voltage and defeated
Voltage out, and extract the AC compounent of the middle DC voltage；
First judgment module 02, for judging whether the AC compounent reaches operation exchange value；If it is not, then determining institute
The earth fault for stating main circuit of converter is located at the busbar of the main circuit of converter；If it is, triggering second judges mould
Block 03；
Second judgment module 03, for judging whether the middle DC voltage meets electric voltage exception condition；Such as
Fruit is then to determine that the earth fault is located at the load-side of the main circuit of converter；If not, according to the AC compounent
Respectively with the voltage magnitude ratio of the input voltage, the output voltage, determine that the earth fault is located at the unsteady flow
The rectification side or inverter side of device main circuit.
The present embodiment has beneficial effect identical with the ground connection diagnostic method of main circuit of converter in above-described embodiment.
Correspondingly, the embodiment of the invention also discloses a kind of ground connection diagnostic devices of main circuit of converter, comprising:
Memory, for storing computer program；
Processor realizes the main electricity of the current transformer as described in embodiment any one of above when for executing the computer program
The step of ground connection diagnostic method on road.
The detail of ground connection diagnostic device in the present embodiment is referred in above-described embodiment the related main electricity of current transformer
The description of the ground connection diagnostic method on road, details are not described herein again.
The present embodiment has beneficial effect identical with the ground connection diagnostic method of main circuit of converter in above-described embodiment.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of ground connection diagnostic method, system and the device of main circuit of converter provided by the present invention have been carried out in detail above
Thin to introduce, used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (12)
1. a kind of ground connection diagnostic method of main circuit of converter characterized by comprising
Middle DC voltage, input voltage and the output voltage of the main circuit of converter are obtained, and extracts the middle
The AC compounent of DC voltage；
Judge whether the AC compounent reaches operation exchange value；If it is not, then determining the ground connection event of the main circuit of converter
Barrier point is located at the busbar of the main circuit of converter；If it is, it is different to judge whether the middle DC voltage meets voltage
Normal condition；
If it is, determining that the earth fault is located at the load-side of the main circuit of converter；If not, according to the friendship
The flow component voltage magnitude ratio with the input voltage, the output voltage respectively, determines that the earth fault is located at institute
State the rectification side or inverter side of main circuit of converter.
2. being grounded diagnostic method according to claim 1, which is characterized in that further include:
When the earth fault is located at the load-side or inverter side of the main circuit of converter, the AC compounent and institute are calculated
The voltage phase difference for stating output voltage determines target phase according to the voltage phase difference；Wherein the target is mutually institute in three-phase
State the circuit phase where earth fault.
3. being grounded diagnostic method according to claim 2, which is characterized in that the main circuit of converter include first resistor and
Second resistance, the first termination positive busbar of the first resistor, the first termination negative busbar of the second resistance, first electricity
The second end of resistance is grounded after being connected with the second end of the second resistance, and the middle DC voltage is the first resistor
Measure voltage.
4. being grounded diagnostic method according to claim 3, which is characterized in that the ground connection for determining the main circuit of converter
Fault point is located at after the busbar of the main circuit of converter, further includes:
When the middle DC voltage be less than first threshold, determine that the earth fault is located at the positive busbar；
When the middle DC voltage be greater than second threshold, determine that the earth fault is located at the negative busbar.
5. being grounded diagnostic method according to claim 4, which is characterized in that it is described according to the AC compounent respectively with it is described
The voltage magnitude ratio of input voltage, the output voltage determines that the earth fault is located at the main circuit of converter
The process of rectification side or inverter side, specifically includes:
Calculate separately the first voltage amplitude proportion of the AC compounent and the input voltage, the AC compounent and described defeated
The second voltage amplitude proportion of voltage out；
When the first voltage amplitude proportion is located at first amplitude section, then determine that the earth fault is located at the current transformer
The rectification side of main circuit；
When the second voltage amplitude proportion is located at the second amplitude section, then determine that the earth fault is located at the current transformer
The inverter side of main circuit；
Wherein, the first amplitude section is obtained with second amplitude section according to the resistance value of the first resistor and second resistance
It arrives.
6. being grounded diagnostic method according to claim 5, which is characterized in that described when the first voltage amplitude proportion is located at
First amplitude section then determines that the earth fault is located at after the rectification side of the main circuit of converter, further includes:
Calculate the voltage phase difference of the input voltage Yu the AC compounent；
When the voltage phase difference is located at the first phase angle difference section, determine that the earth fault is located at the rectification side anode；
When the voltage phase difference is located at the second phase angle difference section, determine that the earth fault is located at the rectification side negative terminal；
Wherein, first phase angle difference section is to allow section, second phase angle difference with 180 ° of phase angle errors for midpoint
Section is to allow section with 0 ° of phase angle error for midpoint.
7. being grounded diagnostic method according to claim 6, which is characterized in that described when the earth fault is located at the change
The load-side for flowing device main circuit, calculates the voltage phase difference of the AC compounent Yu the output voltage, according to the voltage phase
Potential difference determines the process of target phase, specifically includes:
Calculate separately the three-phase voltage of the output voltage and the voltage phase difference of the AC compounent；
Determine that being located at the corresponding circuit of voltage phase difference in first phase angle difference section is mutually target phase.
8. being grounded diagnostic method according to claim 7, which is characterized in that described when the earth fault is located at the change
The inverter side for flowing device main circuit, calculates the voltage phase difference of the AC compounent Yu the output voltage, according to the voltage phase
Potential difference determines the process of target phase, specifically includes:
Calculate separately the three-phase voltage of the output voltage and the voltage phase difference of the AC compounent；
Determine that being located at the corresponding circuit of voltage phase difference in third phase angular difference section is mutually target phase；
Wherein, third phase angle difference section is with 180 ° of phase angle sections for midpoint.
9. according to claim 1 to any one of 8 ground connection diagnostic methods, which is characterized in that the electric voltage exception condition are as follows:
The middle DC voltage abnormal ranges accounting is greater than third threshold value in monocycle.
10. according to claim 1 to any one of 8 ground connection diagnostic methods, which is characterized in that the electric voltage exception condition are as follows:
The abnormality decision value of the middle DC voltage exceeds the 4th threshold value；Wherein the abnormality decision value is the middle
DC voltage presets the corresponding numerical value of decision probability within the monocycle.
11. a kind of ground connection diagnostic system of main circuit of converter characterized by comprising
Data acquisition module, for obtaining middle DC voltage, input voltage and the output voltage of the main circuit of converter,
And extract the AC compounent of the middle DC voltage；
First judgment module, for judging whether the AC compounent reaches operation exchange value；If it is not, then determining the unsteady flow
The earth fault of device main circuit is located at the busbar of the main circuit of converter；If it is, the second judgment module of triggering；
Second judgment module, for judging whether the middle DC voltage meets electric voltage exception condition；If it is,
Determine that the earth fault is located at the load-side of the main circuit of converter；If not, according to the AC compounent respectively with
The voltage magnitude ratio of the input voltage, the output voltage determines that the earth fault is located at the main electricity of the current transformer
The rectification side or inverter side on road.
12. a kind of ground connection diagnostic device of main circuit of converter characterized by comprising
Memory, for storing computer program；
Processor realizes the main circuit of converter as described in any one of claims 1 to 10 when for executing the computer program
Ground connection diagnostic method the step of.
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