CN104007335A - 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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- CN104007335A CN104007335A CN201410183222.1A CN201410183222A CN104007335A CN 104007335 A CN104007335 A CN 104007335A CN 201410183222 A CN201410183222 A CN 201410183222A CN 104007335 A CN104007335 A CN 104007335A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 22
- 230000016507 interphase Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
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Abstract
The invention provides a method and device for detecting detuning of multiple alternating-current filters connected in parallel. The method includes the steps that (a) the current 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; (b) N current root-mean-square values of the first phase of the N alternating-current filters are selected from the current root-mean-square values of the three phases of the same type of N detected alternating-current filters; (c) based on the selected N current root-mean-square values of the first phase, the first average value is determined; (d) 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, and N first difference values are obtained; (e) 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. 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 detection method and the device of alternating current filter off resonance, more particularly, relate to detection method and the device of multiple alternating current filter off resonances in parallel.
Background technology
In the typical line commutation current transformer or electric capacity commutation current transformer current conversion station of HVDC (High Voltage Direct Current) transmission system, passive alternating current filter is used to the unwanted harmonic wave of filtering.Lower in order to ensure the reactive power of alterating and direct current exchange between grids, based on the active power of transmission, some wave filters of the same race are connected or disconnect.In operational process, electric capacity conventionally can be along with passage of time slowly damages, and this finally can cause certain phase off resonance of wave filter.
Existing detection method is: get the mean value of the three-phase current of an alternating current filter, then use the three-phase current of this mean value and this wave filter to compare respectively, if deviation exceeds certain scope, judge this possibility off resonance mutually of wave filter.But if the three-phase input voltage of alternating current filter is slightly uneven, the imbalance between input voltage meets quality of power supply standard-required, existing detection method will provide erroneous judgement.
Summary of the invention
According to an aspect of the present invention, a kind of method that detects N in parallel alternating current filter off resonance is provided, comprises: (a) detect in N the alternating current filter of the same race of described parallel connection each three-phase current value and calculate the electric current root-mean-square valve of every phase based on this; (b) in the electric current root-mean-square valve of the three-phase of detected N alternating current filter of the same race, select N electric current root-mean-square valve of the first-phase of a described N alternating current filter; (c) N based on selected first-phase electric current root-mean-square valve, determines the first mean value; (d) determined the first mean value is made comparisons and obtained N the first difference with N electric current root-mean-square valve of the second-phase of detected described N alternating current filter respectively; And if (e) described N the first difference all exceeds predetermined threshold, judge that first-phase and second-phase input voltage exist uneven.
According to another aspect of the present invention, provide a kind of device that detects N in parallel alternating current filter off resonance of the same race, comprising: multiple detection parts, it detects respectively each the current value of three-phase in a described N alternating current filter; And processor, it is suitable for N current average of the first-phase of selecting a described N alternating current filter in the current average of the three-phase of detected a N alternating current filter; N based on a selected first-phase current average, determines the first mean value; Determined the first mean value is made comparisons and obtained N the first difference with N current average of the second-phase of detected described N alternating current filter respectively; And if described N the first difference all exceeds predetermined threshold, judge that first-phase and second-phase input voltage exist uneven.
Judge alternate whether unbalance this step of multiple alternating current filter input voltages and corresponding parts thereof by introducing, for the detection method of N in parallel alternating current filter off resonance of the same race, can reduce the erroneous judgement due to alternate unbalance the caused alternating current filter off resonance of alternating current filter input voltage in prior art.
Brief description of the drawings
Fig. 1 illustrates the process flow diagram of the method for detection according to an embodiment of the invention N in parallel alternating current filter off resonance of the same race; With
Fig. 2 illustrates the device of N alternating current filter off resonance of the detection parallel connection that realizes Fig. 1 method.
Embodiment
Fig. 1 illustrates the process flow diagram of the method for detection according to an embodiment of the invention N in parallel alternating current filter off resonance of the same race.As shown in Figure 1, in step (a), detect in N alternating current filter each three-phase current value and calculate the current average of every phase based on this, raw 3*N the current average of common property, N alternating current filters different for each phase have N current average, for example, for A phase, the current average of N alternating current filter is I
a1, I
a2..., I
aN; For B phase, the current average of N alternating current filter is I
b1, I
b2..., I
bN, for C phase, the current average of N alternating current filter is I
c1, I
c2..., I
cN; Current average is electric current root-mean-square value.In step (b), in the current average of the three-phase of detected a N alternating current filter, select N current average of the first-phase of a described N alternating current filter; For example first-phase can be A phase, B phase or C phase, the A phase current mean value I that so selected current average is one group of N alternating current filter
a1, I
a2..., I
aN, one group of N alternating current filter B phase current mean value I
b1, I
b2..., I
bNor the C phase current mean value I of one group of N alternating current filter
c1, I
c2..., I
cN.In step (c), the current average of the N based on selected first-phase, determines the first mean value; For example, select the A phase current mean value I of one group of N alternating current filter
a1, I
a2..., I
aN, in this N value, determine the first mean value I
a1_mean, the computing method of the first mean value are as follows:
I
A1_mean＝(I
A1+I
A2+…+I
AN)/N
Wherein, I
a1i
aNn alternating current filter first-phase current average; N is the number of the alternating current filter of the same race of parallel connection, I
a1_meanthe first mean value.
In step (d), by determined the first mean value I
a1_meanmake comparisons and obtain N the first difference with N current average of the second-phase of detected described N alternating current filter respectively; For example, second-phase can be also C phase for B mutually, as long as be different from A mutually.Specifically, can be by the first mean value I
a1_meanrespectively with the B phase current mean value I of N alternating current filter
b1, I
b2..., I
bNand/or the C phase current mean value I of N alternating current filter
c1, I
c2..., I
cNrelatively.In step (e), if described N the first difference all exceeds predetermined threshold, judge that first-phase and second-phase input voltage exist uneven.For example,, if the first mean value I
a1_meanrespectively with the B phase current mean value I of N alternating current filter
b1, I
b2..., I
bNn the first difference I1
_ diff1, I1
_ diff2..., I1
_ diffNall exceed predetermined threshold I
ε, judge and between A phase and B phase input voltage, have imbalance; And for example, if the first mean value I
a1_meanrespectively with the C phase current mean value I of N alternating current filter
c1, I
c2..., I
cNn the first difference I1
_ diff1, I1
_ diff2..., I1
_ diffNall exceed predetermined threshold I
ε, judge and between A phase and C phase input voltage, have imbalance.The above-mentioned more information of filter tuner state that relatively provided.The wave filter of the same race that each is connected in parallel under ideal conditions, should flow through the three-phase current of formed objects on same measurement point.This of wave filter that flows through maximum phase current is tuning best mutually, and this of that wave filter that flows through minimum phase current is tuning the poorest mutually.But, also likely a certain phase of N wave filter of the same race in parallel all to flow through minimum phase current be to cause due to this phase voltage and other phase voltages variant (difference value is in quality of power supply standard allowed band).Judge alternate whether unbalance this step of multiple alternating current filter input voltages by introducing, for the detection method of N in parallel alternating current filter off resonance of the same race, can reduce the erroneous judgement due to alternate unbalance the caused alternating current filter off resonance of alternating current filter input voltage in prior art.
Fig. 2 illustrates the device of N alternating current filter off resonance of the detection parallel connection that realizes Fig. 1 method.Fig. 2 illustrates N in parallel alternating current filter of the same race, the first alternating current filter F
1, the second alternating current filter F
2..., N alternating current filter F
n.The device 2 that detects N in parallel alternating current filter off resonance of the same race comprises: 3*N detection part S
1A, S
1B, S
1C, S
2A, S
2B, S
2C..., S
nA, S
nB, S
nCwith processor 20.3*N detection part S
1A, S
1B, S
1C, S
2A, S
2B, S
2C..., S
nA, S
nB, S
nCdetect respectively each the current value of three-phase in N alternating current filter.Specifically, detection part S
1A, S
1B, S
1Cdetect respectively the first alternating current filter F
1a phase, B phase, the current value of C phase, detection part S
2A, S
2B, S
2Cdetect respectively the second alternating current filter F
2a phase, B phase, the current value of C phase ..., detection part S
nA, S
nB, S
nCdetect respectively N alternating current filter F
na phase, B phase, the current value of C phase.Processor 20 has been suitable for calculating, step (b), step (c), step (d) and the step (e) of the current average of every phase of the alternating current filter in step in Fig. 1 (a).For existing alternating current filter off resonance pick-up unit, do not increase any extra measurement point or main circuit equipment according to device of the present invention, it is more reliable and accurate that the monitoring of wave filter imbalance can become, and this will correspondingly bring the reduction of maintenance cost.
In order further to judge the input voltage that occurs voltage imbalance, for example that A phase is mutually unbalance with B, A phase is mutually unbalance with C, or B phase is mutually unbalance with C, also comprise according to the method for Fig. 1: in step (f), determined the first mean value is made comparisons and obtained N the second difference with N current average of the third phase of detected described N alternating current filter respectively; For example,, if in step (d), by the first mean value I
a1_meanrespectively with the B phase current mean value I of N alternating current filter
b1, I
b2..., I
bNcompare, by the first mean value I
a1_meanrespectively with the C phase current mean value I of N alternating current filter
c1, I
c2..., I
cNrelatively and then obtain N the second difference I2
_ diff1, I2
_ diff2..., I2
_ diffN; Mode as an alternative, if in step (d), the first mean value I just
a1_meanrespectively with the C phase current mean value I of N alternating current filter
c1, I
c2..., I
cNcompare, by the first mean value I
a1_meanrespectively with the B phase current mean value I of N alternating current filter
b1, I
b2..., I
bNrelatively and then obtain N the second difference I2
_ diff1, I2
_ diff2..., I2
_ diffN.In step (g), if described N the second difference all exceeds predetermined threshold, judge that first-phase and third phase input voltage exist uneven; For example,, if the first mean value I
a1_meanrespectively with the C phase current mean value I of N alternating current filter
c1, I
c2..., I
cNn the second difference I2
_ diff1, I2
_ diff2..., I2
_ diffNall exceed predetermined threshold I
ε, judge and between A phase and C phase input voltage, have imbalance; Mode as an alternative, if the first mean value I
a1_meanrespectively with the B phase current mean value I of N alternating current filter
b1, I
b2..., I
bNn the second difference I2
_ diff1, I2
_ diff2..., I2
_ diffNall exceed predetermined threshold I
ε, judge and between A phase and B phase input voltage, have imbalance.In step (h), for example, for example, for example, if judge that according to step (e) with (g) first-phase and second-phase (A phase and B phase) input voltage exist imbalance and first-phase and third phase (A phase and C phase) input voltage also to have imbalance, judge first-phase (A phase) input voltage fault; For example, for example, for example, if judge that according to step (e) with (g) first-phase and second-phase (A phase and B phase) input voltage exist imbalance and first-phase and third phase (A phase and C phase) input voltage not to have imbalance, judge second-phase (B phase) input voltage fault; For example, for example, for example, if judge that according to step (e) with (g) first-phase and second-phase (A phase and B phase) input voltage do not exist imbalance and first-phase and third phase (A phase and B phase) input voltage to have imbalance, judge third phase (C phase) input voltage fault; Otherwise, be judged to be non-input voltage fault.
As shown in Figure 2, the processor 20 that detects the device 2 of N in parallel alternating current filter off resonance of the same race has also been suitable for respectively step (f) in Fig. 1, (g) and (h).
In conjunction with the judgement of the input voltage fault to alternating current filter, also comprise according to the method for Fig. 1: in step (i), in the current average of the three-phase of each in N alternating current filter, select the first intermediate value; Specifically, with regard to the first alternating current filter, the current average of its three-phase is I
a1, I
b1, and I
c1, these three current averages are compared, get its that middle current average as the first intermediate value I
median1; With regard to the second alternating current filter, the current average of its three-phase is I
a2, I
b2, and I
c2, get more afterwards its intermediate value/3 as the first intermediate value I
median2; With regard to N alternating current filter, the current average of its three-phase is I
aN, I
bN, and I
cN, get more afterwards its intermediate value as the first intermediate value I
medianN.In step (j), for each in N alternating current filter, the three-phase current mean value of its first intermediate value and this alternating current filter is made comparisons and obtained three the 3rd differences; Specifically, with regard to the first alternating current filter, the current average of its three-phase is I
a1, I
b1, and I
c1and first intermediate value be I
median1, calculate respectively I
a1-I
median1, I
b1-I
median1, and I
c1-I
median1absolute value as three the 3rd difference I3
_ diff1A, I3
_ diff1B..., I3
_ diff1C; With regard to the second alternating current filter, the current average of its three-phase is I
a2, I
b2, and I
c2and first intermediate value be I
median2, calculate respectively I
a2i
median2, I
b2-I
median2, and I
c2-I
median2absolute value as three the 3rd difference I3
_ diff2A, I3
_ diff2B..., I3
_ diff2C; With regard to N alternating current filter, the current average of its three-phase is I
aN, I
bN, and I
cNand first intermediate value be I
medianN, calculate respectively I
aN-I
medianN, I
bN-I
medianN, and I
cN-I
medianNabsolute value as three the 3rd difference I3
_ diffNA, I3
_ diffNB..., I3
_ diffNC.In step (k), and if be judged to be non-input voltage fault if certain in three the 3rd differences of in corresponding described N alternating current filter exceeds the described step of described predetermined threshold (h), correspondingly there is off resonance in that judges described alternating current filter mutually; Specifically, if corresponding to three the 3rd difference I3 of the first alternating current filter
_ diff1A, I3
_ diff1B..., I3
_ diff1Cin I3
_ diff1Aexceed threshold value I
εand above-mentioned steps (h) is judged A phase input voltage non-fault, judges that the A of the first alternating current filter exists off resonance mutually, if corresponding to three the 3rd difference I3 of the first alternating current filter
_ diff1A, I3
_ diff1B..., I3
_ diff1Cin I3
_ diff1Bexceed threshold value I
εand above-mentioned steps (h) is judged B phase input voltage non-fault, judges that the B of the first alternating current filter exists off resonance mutually, if corresponding to three the 3rd difference I3 of the first alternating current filter
_ diff1A, I3
_ diff1B..., I3
_ diff1Cin I3
_ diff1Cexceed threshold value I
εand above-mentioned steps (h) is judged C phase input voltage non-fault, judges that the C of the first alternating current filter exists off resonance mutually; It will be understood by those of skill in the art that above-mentioned steps (k) is also applicable to judge the off resonance of the second alternating current filter to any one certain phase in N alternating current filter.By the false alarm of avoiding asymmetrical alternating current voltage to cause to alternating current filter on the basis of judgement that whether input voltage of the each phase of alternating current filter is existed to fault.Especially for unattended current conversion station, false alarm will bring very directly customer charge to increase.
As shown in Figure 2, the processor 20 that detects the device 2 of N in parallel alternating current filter off resonance of the same race has also been suitable for respectively the step (i) in Fig. 1, (j) and (k).
Although illustrate and described the present invention with reference to some preferred embodiment of the present invention, but it will be appreciated by those skilled in the art that, in the situation that not deviating from the spirit and scope of the present invention as defined in appended claims, can make a variety of changes it in the form and details.
Claims (6)
1. a method that detects N in parallel alternating current filter off resonance, is characterized in that comprising:
(a) detect in N the alternating current filter of the same race of described parallel connection each three-phase current value and calculate the electric current root-mean-square valve of every phase based on this;
(b) in the electric current root-mean-square valve of the three-phase of detected N alternating current filter of the same race, select N electric current root-mean-square valve of the first-phase of a described N alternating current filter;
(c) N based on selected first-phase electric current root-mean-square valve, determines the first mean value;
(d) determined the first mean value is made comparisons and obtained N the first difference with N electric current root-mean-square valve of the second-phase of detected described N alternating current filter respectively; And
(e), if described N the first difference all exceeds predetermined threshold, judge that first-phase and second-phase input voltage exist uneven.
2. the method for detection as claimed in claim 1 N alternating current filter off resonance in parallel, also comprises:
(f) determined the first mean value is made comparisons and obtained N the second difference with N electric current root-mean-square valve of the third phase of detected described N alternating current filter respectively;
(g), if described N the second difference all exceeds predetermined threshold, judge that first-phase and third phase input voltage exist uneven;
(h) if judge that according to step (e) with (g) first-phase and second-phase input voltage exist imbalance and first-phase and third phase input voltage also to have imbalance, judge that first-phase input voltage is undesired; If judge that according to step (e) with (g) first-phase and second-phase input voltage exist imbalance and first-phase and third phase input voltage not to have imbalance, judge that second-phase input voltage is undesired; If judge that according to step (e) with (g) first-phase and second-phase input voltage do not exist imbalance and first-phase and third phase input voltage to have imbalance, judge that third phase input voltage is undesired; Otherwise, be judged to be non-input voltage undesired.
3. the method for detection as claimed in claim 2 N alternating current filter off resonance in parallel, also comprises:
(i) in the current average of the three-phase of each in a described N alternating current filter, select the first intermediate value;
(j) for each in a described N alternating current filter, the three-phase current root-mean-square value of its first intermediate value and this alternating current filter is made comparisons and obtained three the 3rd differences; And
(k), if to be judged to be non-input voltage undesired and if certain in three the 3rd differences of in corresponding described N alternating current filter exceeds the described step of described predetermined threshold (h), correspondingly there is off resonance in that judges described alternating current filter mutually.
4. a device that detects N in parallel alternating current filter off resonance, is characterized in that comprising:
Multiple detection parts, it detects respectively each the current value of three-phase in a described N alternating current filter; With
Processor, it is suitable for N current average of the first-phase of selecting a described N alternating current filter in the current average of the three-phase of detected a N alternating current filter; N based on a selected first-phase current average, determines the first mean value; Determined the first mean value is made comparisons and obtained N the first difference with N current average of the second-phase of detected described N alternating current filter respectively; And if described N the first difference all exceeds predetermined threshold, judge that first-phase and second-phase input voltage exist uneven.
5. the device of detection as claimed in claim 4 N alternating current filter off resonance in parallel, wherein:
Described processor is also suitable for determined the first mean value to make comparisons and obtain N the second difference with N current average of the third phase of detected described N alternating current filter respectively; If described N the second difference all exceeds predetermined threshold, judge that first-phase and third phase input voltage exist uneven; If judge that first-phase and second-phase input voltage exist imbalance and first-phase and third phase input voltage also to have imbalance, judge first-phase input voltage fault; If judge that first-phase and second-phase input voltage exist imbalance and first-phase and third phase input voltage not to have imbalance, judge second-phase input voltage fault; If it is uneven to judge that first-phase and second-phase input voltage do not exist imbalance and first-phase and third phase input voltage to exist, judge third phase input voltage fault; Otherwise, be judged to be non-input voltage fault.
6. the device of detection as claimed in claim 5 N alternating current filter off resonance in parallel, wherein:
Described processor is also suitable for selecting the first intermediate value in each the current average of three-phase in a described N alternating current filter; For each in a described N alternating current filter, the three-phase current mean value of its first intermediate value and this alternating current filter is made comparisons and obtained three the 3rd differences; And if and if certain in three the 3rd differences of in corresponding described N alternating current filter exceed described in described predetermined threshold and be judged to be non-input voltage fault, correspondingly there is mutually off resonance in that judges described alternating current filter.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410183222.1A CN104007335B (en) | 2014-04-30 | 2014-04-30 | Method and device for detecting detuning of multiple alternating-current filters connected in parallel |
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| CN104007335B CN104007335B (en) | 2017-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112965004A (en) * | 2021-02-05 | 2021-06-15 | 深圳通业科技股份有限公司 | Three-phase power supply detection method and terminal |
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| US4536788A (en) * | 1983-04-26 | 1985-08-20 | Rca Corporation | Demodulated chrominance signal filter using impedance mismatched sections |
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| Publication number | Publication date |
|---|---|
| CN104007335B (en) | 2017-04-12 |
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