CN104007335B - Method and device for detecting detuning of multiple alternating-current filters connected in parallel - Google Patents
Method and device for detecting detuning of multiple alternating-current filters connected in parallel Download PDFInfo
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- CN104007335B CN104007335B CN201410183222.1A CN201410183222A CN104007335B CN 104007335 B CN104007335 B CN 104007335B CN 201410183222 A CN201410183222 A CN 201410183222A CN 104007335 B CN104007335 B CN 104007335B
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- 238000005303 weighing Methods 0.000 claims description 4
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Abstract
Provided are a method and device for detecting detuning of multiple alternating-current filters connected in parallel. The method includes the steps that the current root-mean-square values of three phases of each of the same type of N alternating-current filters connected in parallel are detected, and the current root-mean-square value of each phase is calculated on the basis of the current values; N current root-mean-square values of the first phase of the N alternating-current filters of the same type are selected from the current root-mean-square values of the three phases of the same type of N detected alternating-current filters; based on the selected N current root-mean-square values of the first phase, the first average value is determined; the determined first average value is compared with the N current root-mean-square values of the second phase of the N detected alternating-current filters of the same type, and N first difference values are obtained; and if the N first difference values all exceed a preset threshold, it is determined that the input voltage of the first phase and the input voltage of the second phase are unbalanced, and misjudgment of detuning of the alternating-current filters is reduced based on judged imbalance. Through the method and device, misjudgment of detuning of alternating-current filters caused by inter-phase unbalance of input voltages of the alternating-current filters in the prior art can be reduced.
Description
Technical field
The present invention relates to the detection method and device of alternating current filter off resonance, more particularly, it relates to multiple exchanges in parallel
The detection method and device of wave filter off resonance.
Background technology
In the typical line commutation current transformer or electric capacity commutation current transformer current conversion station of HVDC transmission system, passive friendship
Stream wave filter is used to filter unwanted harmonic wave.In order to the reactive power for ensureing alterating and direct current exchange between grids it is relatively low, based on biography
Defeated active power, some wave filter of the same race are connected or disconnect.In running, electric capacity would generally be elapsed over time slowly
Slow to damage, this eventually results in certain phase off resonance of wave filter.
Existing detection method is：The meansigma methodss of the three-phase current of an alternating current filter are taken, then using the meansigma methodss
It is respectively compared with the three-phase current of the wave filter, if deviation exceeds certain scope, judging the phase of wave filter may lose
It is humorous.But, if the three-phase input voltage of alternating current filter is slightly uneven, i.e., the imbalance between input voltage meets electric energy matter
Amount standard requires that then existing detection method will provide erroneous judgement.
The content of the invention
According to an aspect of the present invention, there is provided a kind of method of detection N number of alternating current filter off resonance in parallel, including：
A () detects the current value of the three-phase of each in the alternating current filter N number of of the same race in parallel and based on this calculating per phase
Electric current root-mean-square valve；B () selects the N in the electric current root-mean-square valve of the three-phase of the alternating current filter N number of of the same race for being detected
N number of electric current root-mean-square valve of the first phase of individual alternating current filter of the same race；The N number of electric current Fang Jun of (c) based on selected first phase
Root, determines the first meansigma methodss；(d) by determined by the first meansigma methodss respectively with the described N number of ac filter of the same race for being detected
N number of electric current root-mean-square valve of the second phase of device is made comparisons and obtains N number of first difference；And if (e) described N number of first difference is all
Beyond predetermined threshold, then judge that the first phase and the second phase input voltage are existed uneven and reduced based on the imbalance for being judged
The erroneous judgement of the alternating current filter off resonance.
According to another aspect of the present invention, there is provided a kind of device of detection alternating current filter off resonance N number of of the same race in parallel,
Including：Multiple detection parts, it detects respectively the current value of the three-phase of each in N number of alternating current filter of the same race；With
Processor, it is suitable to select N number of friendship of the same race in the current average of the three-phase of the alternating current filter N number of of the same race for being detected
N number of current average of the first phase of stream wave filter；Based on N number of current average of selected first phase, determine that first is flat
Average；By determined by the first meansigma methodss respectively with N number of electric current of the second phase of the described N number of alternating current filter of the same race for being detected
Meansigma methodss are made comparisons and obtain N number of first difference；And if N number of first difference all exceeds predetermined threshold, then judge first
Mutually exist uneven and the mistake of the alternating current filter off resonance is reduced based on the imbalance for being judged with the second phase input voltage
Judge.
Judge the step for whether unbalance multiple alternating current filter input voltages alternate and its corresponding part by introducing,
For the detection method of alternating current filter off resonance N number of of the same race in parallel, it is possible to reduce because alternating current filter is defeated in prior art
Enter the erroneous judgement of alternating current filter off resonance caused by alternate unbalance of voltage.
Description of the drawings
The method that Fig. 1 illustrates detection according to an embodiment of the invention alternating current filter off resonance N number of of the same race in parallel
Flow chart；With
Fig. 2 illustrates the device of the detection for realizing Fig. 1 methods N number of alternating current filter off resonance in parallel.
Specific embodiment
The method that Fig. 1 illustrates detection according to an embodiment of the invention alternating current filter off resonance N number of of the same race in parallel
Flow chart.As shown in figure 1, in step (a), detect the three-phase of each in N number of alternating current filter current value and
Based on this current average of the calculating per phase, common property gives birth to 3*N current average, different N number of exchange for each phase
Wave filter has N number of current average, such as A phases, the current average of N number of alternating current filter is IA1,
IA2..., IAN；For B phases, the current average of N number of alternating current filter is IB1, IB2..., IBN, for C phases
For, the current average of N number of alternating current filter is IC1, IC2..., ICN；Current average is RMS current.
In step (b), N number of alternating current filter is selected in the current average of the three-phase of the N number of alternating current filter for being detected
N number of current average of the first phase；Such as the first phase can be A phases, B phases or C phases, then selected current average is
A phase current meansigma methodss I of one group of N number of alternating current filterA1, IA2..., IAN, one group of N number of alternating current filter B phase currents put down
Average IB1, IB2..., IBNOr C phase current meansigma methodss I of one group of N number of alternating current filterC1, IC2..., ICN.
In step (c), based on N number of current average of selected first phase, the first meansigma methodss are determined；For example, one group of N number of friendship is selected
A phase current meansigma methodss I of stream wave filterA1, IA2..., IAN, in N number of value the first meansigma methodss I are determinedA1_mean, first
The computational methods of meansigma methodss are as follows：
IA1_mean=(IA1+IA2+...+IAN)/N
Wherein, IA1...IANIt is N number of alternating current filter the first phase current meansigma methodss；N is alternating current filter of the same race in parallel
Number, IA1_meanIt is the first meansigma methodss.
In step (d), the first meansigma methodss I by determined byA1_meanRespectively with the described N number of alternating current filter for being detected
N number of current average of the second phase make comparisons and obtain N number of first difference；For example, the second phase can also be able to be C phases for B phases,
As long as being different from A phases.Specifically, can be by the first meansigma methodss IA1_meanRespectively with the B phase currents of N number of alternating current filter
Meansigma methodss IB1, IB2..., IBNAnd/or C phase current meansigma methodss I of N number of alternating current filterC1, IC2..., ICNRelatively.
In step (e), if N number of first difference all exceeds predetermined threshold, judge that the first phase and the second phase input voltage are deposited
In imbalance.For example, if the first meansigma methodss IA1_meanRespectively with B phase current meansigma methodss I of N number of alternating current filterB1,
IB2..., IBNN number of first difference I1_diff1, I1_diff2..., I1_diffNAll exceed predetermined threshold Iε, then judge
Exist between A phases and B phase input voltages uneven；And for example, if the first meansigma methodss IA1_meanRespectively with N number of alternating current filter
C phase current meansigma methodss IC1, IC2..., ICNN number of first difference I1_diff1, I1_diff2..., I1_diffNAll beyond pre-
Determine threshold value Iε, then judge there is imbalance between A phases and C phase input voltages.It is above-mentioned compare give filter tuner state
More information.Each wave filter of the same race being connected in parallel, under ideal conditionss, it should flow through in same measurement point identical
The three-phase current of size.Flow through maximum phase current wave filter this mutually be tuning it is best, flow through minimum phase current that
This of wave filter is mutually that tuning is worst.But it is also possible to a certain phase of N number of wave filter of the same race in parallel all flows through minimum
Phase current is because the phase voltage (difference value is in power quality standard allowed band) variant with other phase voltages is caused.It is logical
Cross introducing and judge the step for whether unbalance multiple alternating current filter input voltages alternate, for exchange N number of of the same race filter in parallel
The detection method of ripple device off resonance, it is possible to reduce because the alternate unbalance institute of alternating current filter input voltage is caused in prior art
The erroneous judgement of alternating current filter off resonance.
Fig. 2 illustrates the device of the detection for realizing Fig. 1 methods N number of alternating current filter off resonance in parallel.Fig. 2 illustrates the N of parallel connection
Individual alternating current filter of the same race, the first alternating current filter F1, the second alternating current filter F2..., N alternating current filter FN.Detection
The device 2 of alternating current filter off resonance N number of of the same race in parallel includes：3*N detection part S1A, S1B, S1C, S2A, S2B,
S2C..., SNA, SNB, SNCWith processor 20.3*N detection part S1A, S1B, S1C, S2A, S2B, S2C..., SNA, SNB,
SNCThe current value of the three-phase of each in N number of alternating current filter is detected respectively.Specifically, detection part S1A, S1B, S1CPoint
Do not detect the first alternating current filter F1A phases, B phases, the current value of C phases, detection part S2A, S2B, S2CDetection second respectively is exchanged
Wave filter F2A phases, B phases, the current value of C phases ..., detection part SNA, SNB, SNCN alternating current filter F are detected respectivelyN
A phases, B phases, the current value of C phases.Processor 20 is adapted to carry out in Fig. 1 the electric current of every phase of the alternating current filter in step (a)
The calculating of meansigma methodss, step (b), step (c), step (d) and step (e).Relative to existing alternating current filter off resonance detection
For device, device of the invention does not increase any extra measurement point or main circuit equipment, wave filter imbalance
Monitoring can become relatively reliable and accurate, and this will correspondingly bring the reduction of maintenance cost.
For the input voltage for determining whether voltage imbalance occur, e.g. A phases are unbalance with B phases, and A phases are unbalance with C phases,
Or B phases are unbalance with C phases, also included according to the method for Fig. 1：In step (f), will determined by the first meansigma methodss respectively with institute
N number of current average of the third phase of described N number of alternating current filter of detection is made comparisons and obtains N number of second difference；For example, if
In step (d), by the first meansigma methodss IA1_meanRespectively with B phase current meansigma methodss I of N number of alternating current filterB1,
IB2..., IBNCompare, then by the first meansigma methodss IA1_meanRespectively with the C phase current meansigma methodss of N number of alternating current filter
IC1, IC2..., ICNRelatively further obtain N number of second difference I2_diff1, I2_diff2..., I2_diffN；As replacement side
Formula, if in step (d), just the first meansigma methodss IA1_meanRespectively with the C phase current meansigma methodss of N number of alternating current filter
IC1, IC2..., ICNCompare, then by the first meansigma methodss IA1_meanIt is average with the B phase currents of N number of alternating current filter respectively
Value IB1, IB2..., IBNRelatively further obtain N number of second difference I2_diff1, I2_diff2..., I2_diffN.In step
In (g), if N number of second difference all exceeds predetermined threshold, judge that the first phase and third phase input voltage are present uneven
Weighing apparatus；For example, if the first meansigma methodss IA1_meanRespectively with C phase current meansigma methodss I of N number of alternating current filterC1, IC2...,
ICNN number of second difference I2_diff1, I2_diff2..., I2_diffNAll exceed predetermined threshold Iε, then judge defeated with C phases in A phases
Enter and exist between voltage imbalance；Alternatively, if the first meansigma methodss IA1_meanRespectively with the B of N number of alternating current filter
Phase current meansigma methodss IB1, IB2..., IBNN number of second difference I2_diff1, I2_diff2..., I2_diffNAll beyond pre-
Determine threshold value Iε, then judge there is imbalance between A phases and B phase input voltages.In step (h), if according to step (e) and
G () judges that the first phase and the second phase (such as A phases and B phases) input voltage have uneven and the first phase and third phase (such as A
Mutually and C phases) input voltage there is also imbalance, then judge the first phase (such as A phases) input voltage failure；If according to step
E () and (g) judges that the first phase and the second phase (such as A phases and B phases) input voltage have uneven and the first phase and third phase
There is no imbalance in (such as A phases and C phases) input voltage, then judge the second phase (such as B phases) input voltage failure；If according to
Step (e) and (g) judge first phase and the second phase (such as A phases and B phases) input voltage there is no imbalance and the first phase and
There is imbalance in third phase (such as A phases and B phases) input voltage, then judge third phase (such as C phases) input voltage failure；It is no
Then, it is judged to non-input voltage failure.
As shown in Fig. 2 the processor 20 of the device 2 of detection alternating current filter off resonance N number of of the same race in parallel is also respectively adapted to
Complete step (f), (g) and (h) in Fig. 1.
With reference to the judgement of the input voltage failure to alternating current filter, also included according to the method for Fig. 1：In step (i),
The first intermediate value is selected in the current average of the three-phase of each in N number of alternating current filter；Specifically, hand over regard to first
For stream wave filter, the current average of its three-phase is IA1, IB1, and IC1, three current averages are compared, take wherein
Between that current average as the first intermediate value IMedian1；For the second alternating current filter, the electric current of its three-phase is average
It is worth for IA2, IB2, and IC2, its intermediate value/3 is taken more afterwards as the first intermediate value IMedian2；......；With regard to N alternating current filters
For, the current average of its three-phase is IAN, IBN, and ICN, its intermediate value is taken more afterwards as the first intermediate value IMedianN.
In step (j), for each in N number of alternating current filter, by its first intermediate value and the three-phase current of the alternating current filter
Meansigma methodss are made comparisons and obtain three the 3rd differences；Specifically, for the first alternating current filter, the current average of its three-phase
For IA1, IB1, and IC1And its first intermediate value be IMedian1, I is calculated respectivelyA1-IMedian1, IB1-IMedian1, and IC1-IMedian1's
Absolute value is used as three the 3rd differences I3_diff1A, I3_diff1B..., I3_diff1C；For the second alternating current filter, it three
The current average of phase is IA2, IB2, and IC2And its first intermediate value be IMedian2, I is calculated respectivelyA2-IMedian2, IB2-
IMedian2, and IC2-IMedian2Absolute value as three the 3rd differences I3_diff2A, I3_diff2B...,
I3_diff2C；......；For N alternating current filters, the current average of its three-phase is IAN, IBN, and ICNAnd its in first
Between value be IMedianN, I is calculated respectivelyAN-IMedianN, IBN-IMedianN, and ICN-IMedianNAbsolute value as three the 3rd differences
I3_diffNA, I3_diffNB..., I3_diffNC.In step (k), if in correspondence N number of alternating current filter
Certain in three the 3rd differences exceeds the predetermined threshold and if the step (h) is judged to non-input voltage failure,
Then judge that the corresponding of the alternating current filter mutually has off resonance；Specifically, if corresponding to three of the first alternating current filter
3rd difference I3_diff1A, I3_diff1B..., I3_diff1CIn I3_diff1ABeyond threshold value IεAnd above-mentioned steps (h) judge A
There is off resonance in phase input voltage fault-free, the then A phases for judging the first alternating current filter, if corresponding to the first alternating current filter
Three the 3rd differences I3_diff1A, I3_diff1B..., I3_diff1CIn I3_diff1BBeyond threshold value IεAnd above-mentioned steps (h)
B phase input voltage fault-frees are judged, then the B phases for judging the first alternating current filter have off resonance, if corresponding to the first exchange filter
Three the 3rd differences I3 of ripple device_diff1A, I3_diff1B..., I3_diff1CIn I3_diff1CBeyond threshold value IεAnd above-mentioned step
Suddenly (h) judges C phase input voltage fault-frees, then the C phases for judging the first alternating current filter have off resonance；Those skilled in the art
It should be appreciated that above-mentioned steps (k) are also applied for judging the second alternating current filter to any one certain phase in N alternating current filters
Off resonance.By the input voltage to each phase of alternating current filter with the presence or absence of failure judgement on the basis of to alternating current filter
The false alarm for avoiding asymmetrical alternating current voltage from causing.Particularly with unattended current conversion station, false alarm will bring very direct
Customer charge increase.
As shown in Fig. 2 the processor 20 of the device 2 of detection alternating current filter off resonance N number of of the same race in parallel is also respectively adapted to
The step (i) in Fig. 1 is completed, (j) with (k).
Although illustrating and describing the present invention with reference to some preferred embodiments of the present invention, those skilled in the art should
When understanding, in the case of without departing substantially from the spirit and scope of the present invention as defined in appended claims, can be in form
It is made a variety of changes in upper and details.
Claims (6)
1. the method for a kind of detection alternating current filter off resonance N number of of the same race in parallel, it is characterised in that include：
A () detects the current value of the three-phase of each in the alternating current filter N number of of the same race in parallel and based on this calculating
Electric current root-mean-square valve per phase；
B () selects N number of exchange filter of the same race in the electric current root-mean-square valve of the three-phase of the alternating current filter N number of of the same race for being detected
N number of electric current root-mean-square valve of the first phase of ripple device；
C the N number of electric current root-mean-square valve of () based on selected first phase, determines the first meansigma methodss；
(d) by determined by the first meansigma methodss respectively with N number of electricity of the second phase of the described N number of alternating current filter of the same race for being detected
Stream root-mean-square valve is made comparisons and obtains N number of first difference；And
If e () described N number of first difference all exceeds predetermined threshold, judge that the first phase and the second phase input voltage are present uneven
Weighing apparatus and the erroneous judgement based on the imbalance reduction alternating current filter off resonance for being judged.
2. the method for detection as claimed in claim 1 alternating current filter off resonance N number of of the same race in parallel, also includes：
(f) by determined by the first meansigma methodss respectively with N number of electricity of the third phase of the described N number of alternating current filter of the same race for being detected
Stream root-mean-square valve is made comparisons and obtains N number of second difference；
If g () described N number of second difference all exceeds predetermined threshold, judge that the first phase and third phase input voltage are present uneven
Weighing apparatus；
If h () judges that first phase and the second phase input voltage have uneven and the first phase and the according to step (e) and (g)
Three-phase input voltage there is also imbalance, then judge that the first phase input voltage is abnormal；If judged according to step (e) and (g)
First phase and the second phase input voltage there is imbalance and the first phase and third phase input voltage do not have imbalance, then judge
Second phase input voltage is abnormal；If judging that the first phase and the second phase input voltage do not have injustice according to step (e) and (g)
There is imbalance in weighing apparatus and the first phase and third phase input voltage, then judge that third phase input voltage is abnormal；Otherwise, it is determined that being
Non-input voltage is abnormal.
3. the method for detection as claimed in claim 2 alternating current filter off resonance N number of of the same race in parallel, also includes：
The first intermediate value is selected in the current average of the three-phase of each of (i) in N number of alternating current filter of the same race；
(j) for each in N number of alternating current filter of the same race, by its first intermediate value and the three-phase of the alternating current filter
RMS current is made comparisons and obtains three the 3rd differences；And
If k certain in three the 3rd differences of in () correspondence N number of alternating current filter of the same race is beyond described pre-
Determine threshold value and if the step (h) is judged to that non-input voltage is abnormal, then judge the corresponding phase of the alternating current filter
There is off resonance.
4. the device of a kind of detection alternating current filter off resonance N number of of the same race in parallel, it is characterised in that include：
Multiple detection parts, it detects respectively the current value of the three-phase of each in N number of alternating current filter of the same race；With
Processor, it is suitable to select described N number of same in the current average of the three-phase of the alternating current filter N number of of the same race for being detected
Plant N number of current average of the first phase of alternating current filter；Based on N number of current average of selected first phase, is determined
One meansigma methodss；The first meansigma methodss are N number of with the second phase of the described N number of alternating current filter of the same race for being detected respectively by determined by
Current average is made comparisons and obtains N number of first difference；And if N number of first difference all exceeds predetermined threshold, then judge
First phase and the second phase input voltage exist uneven and reduce the alternating current filter off resonance based on the imbalance for being judged
Erroneous judgement.
5. the device of alternating current filter off resonance N number of of the same race in parallel is detected as claimed in claim 4, wherein：
The processor be further adapted for by determined by the first meansigma methodss respectively with the described N number of alternating current filter of the same race for being detected
N number of current average of third phase is made comparisons and obtains N number of second difference；If N number of second difference all exceeds predetermined threshold,
Then judge that the first phase and third phase input voltage are present uneven；If it is determined that the first phase and the second phase input voltage exist uneven
Weigh and the first phase and third phase input voltage there is also imbalance, then judge the first phase input voltage failure；If it is determined that the
One phase and the second phase input voltage have that uneven and the first phase and third phase input voltage do not have imbalance, then judge the
Two-phase input voltage failure；If it is determined that there is no imbalance and the first phase and third phase in the first phase and the second phase input voltage
There is imbalance in input voltage, then judge third phase input voltage failure；Otherwise, it is determined that being non-input voltage failure.
6. the device of alternating current filter off resonance N number of of the same race in parallel is detected as claimed in claim 5, wherein：
The processor is further adapted for being selected in the current average of the three-phase of each in N number of alternating current filter of the same race
First intermediate value；For each in N number of alternating current filter of the same race, by its first intermediate value and the alternating current filter
Three-phase current meansigma methodss are made comparisons and obtain three the 3rd differences；And if in correspondence N number of alternating current filter of the same race
Certain in three individual the 3rd differences is then sentenced beyond the predetermined threshold and if described be judged to non-input voltage failure
Mutually there is off resonance in the corresponding of the fixed alternating current filter.
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| CN104007335B true CN104007335B (en) | 2017-04-12 |
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| CN112965004B (en) * | 2021-02-05 | 2023-04-11 | 深圳通业科技股份有限公司 | Three-phase power supply detection method and terminal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536788A (en) * | 1983-04-26 | 1985-08-20 | Rca Corporation | Demodulated chrominance signal filter using impedance mismatched sections |
| US5786788A (en) * | 1996-10-08 | 1998-07-28 | Raytheon Company | Radar system and method for reducing range sidelobes |
| RU2261509C1 (en) * | 2004-04-14 | 2005-09-27 | Государственное Образовательное Учреждение Высшего Профессионального Образования "Омский Государственный Технический Университет" | Device for backup protection of line with branches |
| US8380770B1 (en) * | 2009-05-11 | 2013-02-19 | Lockheed Martin Corporation | Mismatched filters for long binary codes |
| CN103412209A (en) * | 2013-07-18 | 2013-11-27 | 西安理工大学 | Method for detecting mistuning degree of tuned filter |
| CN103675560A (en) * | 2013-12-30 | 2014-03-26 | 武汉大学 | Online identifying method for detuning of direct current side filter of high-voltage direct current transmission system |
-
2014
- 2014-04-30 CN CN201410183222.1A patent/CN104007335B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4536788A (en) * | 1983-04-26 | 1985-08-20 | Rca Corporation | Demodulated chrominance signal filter using impedance mismatched sections |
| US5786788A (en) * | 1996-10-08 | 1998-07-28 | Raytheon Company | Radar system and method for reducing range sidelobes |
| RU2261509C1 (en) * | 2004-04-14 | 2005-09-27 | Государственное Образовательное Учреждение Высшего Профессионального Образования "Омский Государственный Технический Университет" | Device for backup protection of line with branches |
| US8380770B1 (en) * | 2009-05-11 | 2013-02-19 | Lockheed Martin Corporation | Mismatched filters for long binary codes |
| CN103412209A (en) * | 2013-07-18 | 2013-11-27 | 西安理工大学 | Method for detecting mistuning degree of tuned filter |
| CN103675560A (en) * | 2013-12-30 | 2014-03-26 | 武汉大学 | Online identifying method for detuning of direct current side filter of high-voltage direct current transmission system |
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