CN107144732B - User-side harmonic source localization method based on lumped power - Google Patents
User-side harmonic source localization method based on lumped power Download PDFInfo
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- CN107144732B CN107144732B CN201710514865.3A CN201710514865A CN107144732B CN 107144732 B CN107144732 B CN 107144732B CN 201710514865 A CN201710514865 A CN 201710514865A CN 107144732 B CN107144732 B CN 107144732B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
The invention discloses a kind of user-side harmonic source localization method based on lumped power, comprising steps of the current signal at one, the acquisition commonly connected PCC point of power distribution network at voltage signal and user side feeder line head end；Two, the harmonic components of acquisition signal are obtained；Three, the lumped power and lump active power of each harmonic at user side feeder line head end are calculated；Four, user-side harmonic source and each overtone order are positioned；Five, the display output of user-side harmonic electric current.For the present invention when power quality problem occurs, harmonic source is pin-pointed to each user, and accurately calculates the content and ingredient of each user's harmonic wave, fair carry out responsibility punishment, avoids power quality dispute and the unclear problem of harmonic contributions.
Description
Technical field
The invention belongs to harmonic contributions to distinguish technical field, and in particular to a kind of user-side harmonic source based on lumped power
Localization method.
Background technique
In recent years, solar power generation, wind-power electricity generation distributed power supply are directly accessed power distribution network, bring newly to power distribution network
Harmonic problem, largely electrical equipment containing power electronic devices accesses power distribution network, humorous but also user's electric current is distorted
Wave pollution is on the rise.Distribution network electric energy loss is significantly increased in harmonic current, and electrical equipment overheats and the lost of life, even
The resonance overvoltage caused danger seriously affects safety, the reliability of power supply, it has also become big public hazards of power distribution network.By
It is more in harmonic wave number of users, type is complicated, and there are stronger couplings for the harmonic current that different harmonic wave user generates, can not
The harmonic source for directly positioning user, is a big research hotspot of current smart grid.Existing user-side harmonic source localization method
It is load impedance method, this method can only qualitatively judge whether user is harmonic source, and can not determine the harmonic content of user and humorous
Wave component.Power distribution network points of common connection (Point of Common Coupling, PCC), i.e. PCC point is connected to multiple users, because
The true horizon of each user's harmonic wave can not be represented for PCC point harmonic current level, this will lead to power quality dispute and harmonic wave duty
Appoint it is unclear, when power quality problem occurs, responsibility punishment can not be carried out.According to the harmonic wave pipe of China's " whose pollution, who is administered "
Principle is managed, user should be accurately positioned in harmonic contributions.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of based on lump
Harmonic source is pin-pointed to each user, and quasi- when power quality problem occurs by the user-side harmonic source localization method of power
The content and ingredient of each user's harmonic wave are really calculated, fair carry out responsibility punishment avoids power quality dispute and harmonic contributions
Unclear problem, convenient for promoting the use of.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: the user-side harmonic source based on lumped power
Localization method, which is characterized in that method includes the following steps:
Step 1: the electric current letter at the acquisition commonly connected PCC point of power distribution network at voltage signal and user side feeder line head end
Number: the A phase voltage u of the acquisition commonly connected PCC point of power distribution networkPA(t), B phase voltage uPB(t), C phase voltage uPC(t), pass through feeder line
Current transformer group acquires three-phase current i at m user side feeder line head end of power distribution network respectivelyM.A(t)、iM.B(t)、iM.C(t),
In, m and M are positive integer and M=1,2 ..., m；
Step 2: obtaining the harmonic components of acquisition signal: processor extracts u using Fourier transformation respectivelyPA(t)、uPB
(t) and uPC(t) phasor of each harmonic component, obtainsWithDistinguished simultaneously using Fourier transformation
Extract iM.A(t)、iM.B(t) and iM.C(t) phasor of each harmonic component, obtainsWithK is except base
Overtone order and k outside wave are classified as set Nk；
Step 3: it is as follows to calculate the lumped power of each harmonic and lump active power, process at user side feeder line head end:
Step 301, according to formulaCalculate m-th user side
The lumped power of y subharmonic at feeder line head endWherein, y ∈ Nk,ForConjugation,ForBe total to
Yoke,ForConjugation；
Step 302, according to formulaM-th is calculated to use
The lump active power of y subharmonic at the feeder line head end of family side
Step 303, multiple circulation step 301 to step 302 obtain set NkEach time at interior each user side feeder line head end
The lumped power and lump active power of harmonic wave；
Step 4: positioning user-side harmonic source and each overtone order: passing throughIt is humorous to each time at user side feeder line head end
Wave carries out screening positioning, whenWhen, by thisCorresponding Customs Assigned Number M positions user-side harmonic source position, passes through
It shouldCorresponding y subharmonic determines harmonic wave derived components, and the Customs Assigned Number M containing harmonic source is indicated that Z is classified as set N with ZZ,
Y is classified as set NL；WhenWhen, it shouldCorresponding user is anharmonic wave source user, by thisCorresponding harmonic wave
Number y is classified as gatheringWherein,
Step 5: the display of user-side harmonic electric current exports, process is as follows:
Step 501, according to formulaCalculate the lump equivalent conductance at user ZFor the y subharmonic at user Z lumped voltage virtual value and
UPA.yFor the y subharmonic phasor of PCC point A phase voltageVirtual value, UPB.yFor the y subharmonic phasor of PCC point B phase voltageVirtual value, UPC.yFor the y subharmonic phasor of PCC point C phase voltageVirtual value；
Step 502, according to formulaCalculate the y subharmonic equivalent conductance at user ZWherein, y
∈NL；
Step 503, multiple circulation step 502 obtain set N at user ZLThe equivalent conductance of interior each harmonic；
Step 504, according to formulaCalculate separately A phase harmonic current at user ZB phase harmonic currentWith C phase harmonic current
Step 505, multiple circulation step 501 to step 504 obtain set NZThe three phase harmonic electric current of interior each user,
And it is shown and is exported by display.
The above-mentioned user-side harmonic source localization method based on lumped power, it is characterised in that: pass through bus in step 1
The A phase voltage u of the acquisition commonly connected PCC point of power distribution network of voltage transformer onePA(t), matched by the acquisition of bus-bar potential transformer two
The B phase voltage u of the commonly connected PCC point of power gridPB(t), the commonly connected PCC point of power distribution network is acquired by bus-bar potential transformer three
C phase voltage uPC(t)。
The above-mentioned user-side harmonic source localization method based on lumped power, it is characterised in that: feeder current in step 1
The quantity of mutual inductor group is m.
The above-mentioned user-side harmonic source localization method based on lumped power, it is characterised in that: connected on the processor
Have a memory and communication module, the signal output end of bus-bar potential transformer one, bus-bar potential transformer two signal output end,
The signal output end of bus-bar potential transformer three and the signal output end of feeder current mutual inductor group are defeated with the signal of processor
Enter end to connect, the signal input part of display connects with the signal output end of processor.
Compared with the prior art, the present invention has the following advantages:
1, the three-phase voltage of the present invention acquisition commonly connected PCC point of power distribution network, while passing through feeder current mutual inductor component
Not Cai Ji three-phase current at m user side feeder line head end of power distribution network, obtain that related data is simple and fast, and input cost is low, is convenient for
It promotes the use of.
2, the present invention extracts the phasor of each harmonic component respectively, leads to by carrying out Fourier transformation to the signal of acquisition
It is humorous clearly to distinguish points of common connection generation for the lumped power and lump active power for crossing each harmonic at user side feeder line head end
The user of wave and the anharmonic wave source user for not generating harmonic wave, the harmonic content of points of common connection other side grid side and harmonic wave at
Point, harmonic source is pin-pointed to each user, reliable and stable, using effect is good.
3, the method for the present invention step is simple, clear by three phase harmonic electric current and equivalent conductance at user side feeder line head end
The harmonic components and harmonic content that Harmonics source customer generates, the unified carry out responsibility punishment by current value justice, avoid electric energy
Quality dispute and the unclear problem of harmonic contributions, standard are unified.
In conclusion the present invention, when power quality problem occurs, harmonic source is pin-pointed to each user, and accurately calculates
The content and ingredient of each user's harmonic wave out, fair carry out responsibility punishment, avoids power quality dispute and harmonic contributions unclear
Problem, convenient for promoting the use of.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the distribution wiring diagram that the present invention uses.
Fig. 2 is schematic block circuit diagram of the invention.
Fig. 3 is the method flow block diagram of user-side harmonic source of the present invention localization method.
Fig. 4 is the spectrogram that A phase observes electric current at the 1st user side feeder line head end of the present embodiment power distribution network.
Fig. 5 is the spectrogram that A phase observes electric current at the 2nd user side feeder line head end of the present embodiment power distribution network.
Fig. 6 is the spectrogram that A phase observes electric current at the 3rd user side feeder line head end of the present embodiment power distribution network.
Fig. 7 is the spectrogram that A phase observes electric current at the 4th user side feeder line head end of the present embodiment power distribution network.
Fig. 8 is the spectrogram that A phase observes electric current at the 5th user side feeder line head end of the present embodiment power distribution network.
Fig. 9 is the harmonic current waveforms figure of Fig. 4.
Figure 10 is the spectrogram of Fig. 9.
Figure 11 is the harmonic current waveforms figure of Fig. 6.
Figure 12 is the spectrogram of Figure 11.
Description of symbols:
1-higher level's power distribution network；2-distributed generation resources；3-bus-bar potential transformers one；
4-bus-bar potential transformers two；5-bus-bar potential transformers three；9-processors；
10-feeder current mutual inductor groups；11-memories；
12-communication modules；13-displays.
Specific embodiment
As shown in Figure 1 to Figure 3, the user-side harmonic source localization method of the invention based on lumped power, including following step
It is rapid:
Step 1: the electric current letter at the acquisition commonly connected PCC point of power distribution network at voltage signal and user side feeder line head end
Number: the A phase voltage u of the acquisition commonly connected PCC point of power distribution networkPA(t), B phase voltage uPB(t), C phase voltage uPC(t), pass through feeder line
Current transformer group 10 acquires three-phase current i at m user side feeder line head end of power distribution network respectivelyM.A(t)、iM.B(t)、iM.C(t),
Wherein, m and M is positive integer and M=1,2 ..., m；
In the present embodiment, the A phase of the commonly connected PCC point of power distribution network is acquired in step 1 by bus-bar potential transformer 1
Voltage uPA(t), the B phase voltage u of the commonly connected PCC point of power distribution network is acquired by bus-bar potential transformer 24PB(t), pass through mother
The C phase voltage u of the acquisition commonly connected PCC point of power distribution network of line voltage mutual inductor 35PC(t)。
In the present embodiment, the quantity of feeder current mutual inductor group 10 is m in step 1.
In the present embodiment, memory 11 and communication module 12, bus-bar potential transformer 1 are connected on the processor 9
Signal output end, the signal output end of bus-bar potential transformer 24, the signal output end of bus-bar potential transformer 35 and feedback
The signal output end of line current mutual inductor group 10 connects with the signal input part of processor 9, the signal input part of display 13
Connect with the signal output end of processor 9.
It should be noted that m takes 5 in the present embodiment, the commonly connected PCC of power distribution network is acquired by bus-bar potential transformer
The three-phase voltage of point, while three-phase at m user side feeder line head end of power distribution network is acquired by feeder current mutual inductor group 10 respectively
Electric current, acquisition related data is simple and fast, and input cost is low, and each feeder current mutual inductor group 10 includes feeder current mutual inductance
Device one, feeder current mutual inductor two and feeder current mutual inductor three acquire A phase current at user side feeder line head end, B phase electricity respectively
Stream and C phase current.
It should be noted that the equal three-phase equilibrium of three-phase current is symmetrical at power distribution network three-phase voltage and user side feeder line head end,
Each phase voltage amplitude of power distribution network three-phase voltage is approximate and phase differs equal between each other, three-phase current at user side feeder line head end
Each phase current magnitude is approximate and phase differs equal between each other, in the present embodiment, is with A phase current at user side feeder line head end
Example, the A phase voltage for the PCC point that bus-bar potential transformer 1 acquires are sent into processor 9, and m feeder current mutual inductor group 10 is distinguished
The A phase current for acquiring each user is sent into processor 9.
Step 2: obtaining the harmonic components of acquisition signal: processor 9 extracts u using Fourier transformation respectivelyPA(t)、uPB
(t) and uPC(t) phasor of each harmonic component, obtainsWithDistinguished simultaneously using Fourier transformation
Extract iM.A(t)、iM.B(t) and iM.C(t) phasor of each harmonic component, obtainsWithK is except base
Overtone order and k outside wave are classified as set Nk；
It should be noted that each user's harmonic current causes to observe there are stronger coupling due at PCC point
Harmonic current size and ingredient do not represent each user transmitting true harmonic it is horizontal, the feeder line where anharmonic wave source user
It can observe harmonic wave, the frequency of fundamental wave is 50Hz, and harmonic frequency is fundamental frequency integral multiple, as shown in Fig. 4 to Fig. 8, using fast
Current signal at fast each user side feeder line head end of Fourier transform pairs carries out spectrum analysis, observes each user side feeder line head end
Overtone order of the A phase current at place in addition to fundamental wave is respectively 5,7,9,11.Therefore, k takes 5,7,9,11 in the present embodiment, set Nk
For { 5,7,9,11 }.
Step 3: it is as follows to calculate the lumped power of each harmonic and lump active power, process at user side feeder line head end:
Step 301, according to formulaCalculate m-th user side
The lumped power of y subharmonic at feeder line head endWherein, y ∈ Nk,ForConjugation,ForBe total to
Yoke,ForConjugation；
Step 302, according to formulaM-th is calculated to use
The lump active power of y subharmonic at the feeder line head end of family side
Step 303, multiple circulation step 301 to step 302 obtain set NkEach time at interior each user side feeder line head end
The lumped power and lump active power of harmonic wave；
It should be noted that there are stronger couplings between different user for harmonic current, due to route in the present embodiment
The influence of impedance, harmonic current can flow to each route of power distribution network, cause user's harmonic contributions that can not accurately distinguish, to each
The lump active power of each harmonic calculate at user side feeder line head end:
Step 4: positioning user-side harmonic source and each overtone order: passing throughIt is humorous to each time at user side feeder line head end
Wave carries out screening positioning, whenWhen, by thisCorresponding Customs Assigned Number M positions user-side harmonic source position, passes through
It shouldCorresponding y subharmonic determines harmonic wave derived components, and the Customs Assigned Number M containing harmonic source is indicated that Z is classified as set N with ZZ,
Y is classified as set NL；WhenWhen, it shouldCorresponding user is anharmonic wave source user, by thisCorresponding harmonic wave
Number y is classified as gatheringWherein,
It should be noted that in the present embodiment, to the lump active power of each harmonic at each user side feeder line head end
Calculated the lump active power it is found that 7 subharmonic at the 1st user side feeder line head endAnd then orient 7
Subharmonic is generated by the 1st user；The lump active power of 9 subharmonic at 3rd user side feeder line head end3rd
The lump active power of 11 subharmonic at a user side feeder line head endAnd then orient 9 subharmonic and 11 subharmonic
It is generated by the 3rd user, shows that 7 subharmonic, 9 subharmonic, 11 subharmonic are generated by user, therefore, Z takes in the present embodiment
1,3, set NZFor { 1,3 }, y takes 7,9,11 in the present embodiment, set NLFor { 7,9,11 }.
As shown in Figure 9 and Figure 10, the 1st user introduces 7 subharmonic currents, and as is illustrated by figs. 11 and 12, the 3rd user draws
Enter 9 subharmonic currents and 11 subharmonic currents.
It should be noted that observing overtone order difference of the A phase current in addition to fundamental wave at each user side feeder line head end
It is 5,7,9,11.And being by the overtone order that user generates is respectively 7,9,11.It is found that 5 subharmonic are generated by network system side.
Step 5: the display of user-side harmonic electric current exports, process is as follows:
Step 501, according to formulaCalculate the lump equivalent conductance at user ZFor the y subharmonic at user Z lumped voltage virtual value and
UPA.yFor the y subharmonic phasor of PCC point A phase voltageVirtual value, UPB.yFor the y subharmonic phasor of PCC point B phase voltageVirtual value, UPC.yFor the y subharmonic phasor of PCC point C phase voltageVirtual value；
Step 502, according to formulaCalculate the y subharmonic equivalent conductance at user ZWherein, y
∈NL；
Step 503, multiple circulation step 502 obtain set N at user ZLThe equivalent conductance of interior each harmonic；
Step 504, according to formulaCalculate separately A phase harmonic current at user ZB phase harmonic currentWith C phase harmonic current
Step 505, multiple circulation step 501 to step 504 obtain set NZThe three phase harmonic electric current of interior each user,
And pass through the display output of display 13.
It should be noted that carrying out harmonic current calculating to the user for generating harmonic wave, A phase at user side feeder line head end is calculated
Harmonic current obtains:
In the present embodiment, A phase harmonic current virtual value I at the 1st user side feeder line head end1.A.v=9.7A, the 3rd user
A phase harmonic current virtual value at the feeder line head end of sideHarmonic wave user can be not only positioned, can also be determined
Amount calculates the harmonic current value that each user generates and specifies the harmonic contributions of all users in electric current under this same benchmark, can
The implementation for promoting " with matter price and the harmonic wave rewards and punishments scheme " of electricity marketization, provides to reduce electric energy loss and harmonic wave control
Scientific basis.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (4)
1. the user-side harmonic source localization method based on lumped power, which is characterized in that method includes the following steps:
Step 1: the current signal at the acquisition commonly connected PCC point of power distribution network at voltage signal and user side feeder line head end: adopting
Collect the A phase voltage u of the commonly connected PCC point of power distribution networkPA(t), B phase voltage uPB(t), C phase voltage uPC(t), mutual by feeder current
Sensor group (10) acquires three-phase current i at m user side feeder line head end of power distribution network respectivelyM.A(t)、iM.B(t)、iM.C(t), wherein
M and M is positive integer and M=1,2 ..., m；
Step 2: obtaining the harmonic components of acquisition signal: processor (9) extracts u using Fourier transformation respectivelyPA(t)、uPB(t)
And uPC(t) phasor of each harmonic component, obtainsWithIt is extracted respectively using Fourier transformation simultaneously
iM.A(t)、iM.B(t) and iM.C(t) phasor of each harmonic component, obtainsWithK is in addition to fundamental wave
Overtone order and k be classified as set Nk；
Step 3: it is as follows to calculate the lumped power of each harmonic and lump active power, process at user side feeder line head end:
Step 301, according to formulaCalculate m-th user side feeder line
The lumped power of y subharmonic at head endWherein, y ∈ Nk,ForConjugation,ForConjugation,ForConjugation；
Step 302, according to formulaCalculate m-th user side
The lump active power of y subharmonic at feeder line head end
Step 303, multiple circulation step 301 to step 302 obtain set NkEach harmonic at interior each user side feeder line head end
Lumped power and lump active power；
Step 4: positioning user-side harmonic source and each overtone order: passing throughTo each harmonic at user side feeder line head end into
Row screening positioning, whenWhen, by thisCorresponding Customs Assigned Number M positions user-side harmonic source position, by thisCorresponding y subharmonic determines harmonic wave derived components, and the Customs Assigned Number M containing harmonic source is indicated that Z is classified as set N with ZZ, will
Y is classified as set NL；WhenWhen, it shouldCorresponding user is anharmonic wave source user, by thisCorresponding overtone order
Y is classified as gatheringWherein,
Step 5: the display of user-side harmonic electric current exports, process is as follows:
Step 501, according to formulaCalculate the lump equivalent conductance at user Z For with
The lumped voltage virtual value of y subharmonic at the Z of family andUPA.yFor PCC point A phase voltage
Y subharmonic phasorVirtual value, UPB.yFor the y subharmonic phasor of PCC point B phase voltageVirtual value, UPC.yFor
The y subharmonic phasor of PCC point C phase voltageVirtual value；
Step 502, according to formulaCalculate the y subharmonic equivalent conductance at user ZWherein, y ∈ NL；
Step 503, multiple circulation step 502 obtain set N at user ZLThe equivalent conductance of interior each harmonic；
Step 504, according to formulaCalculate separately A phase harmonic current at user ZB phase harmonic currentWith C phase harmonic current
Step 505, multiple circulation step 501 to step 504 obtain set NZThe three phase harmonic electric current of interior each user, and pass through
Display (13) display output.
2. the user-side harmonic source localization method described in accordance with the claim 1 based on lumped power, it is characterised in that: step 1
In by bus-bar potential transformer one (3) acquire the commonly connected PCC point of power distribution network A phase voltage uPA(t), mutual by busbar voltage
The B phase voltage u of sensor two (4) the acquisition commonly connected PCC point of power distribution networkPB(t), matched by bus-bar potential transformer three (5) acquisition
The C phase voltage u of the commonly connected PCC point of power gridPC(t)。
3. the user-side harmonic source localization method described in accordance with the claim 1 based on lumped power, it is characterised in that: step 1
The quantity of middle feeder current mutual inductor group (10) is m.
4. the user-side harmonic source localization method based on lumped power according to claim 2, it is characterised in that: the place
Memory (11) and communication module (12), signal output end, the bus of bus-bar potential transformer one (3) are connected in reason device (9)
The signal output end of voltage transformer two (4), the signal output end of bus-bar potential transformer three (5) and feeder current mutual inductor group
(10) signal output end connects with the signal input part of processor (9), the signal input part and processor of display (13)
(9) signal output end connects.
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| CN109061300B (en) * | 2018-09-19 | 2020-11-10 | 江苏中凌高科技股份有限公司 | Characteristic harmonic source positioning method for PCC (point of common coupling) |
| CN110927425B (en) * | 2018-09-20 | 2021-09-07 | 中国石油化工股份有限公司 | Harmonic source section positioning method of power distribution network based on harmonic current monitoring |
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Effective date of registration: 20201029 Address after: Room 702, block a, innovation and technology building, northwest Polytechnic University, 127 Youyi West Road, Beilin District, Xi'an City, Shaanxi Province Patentee after: XI'AN DUOPUDUO INFORMATION TECHNOLOGY Co.,Ltd. Address before: 710054 No. 58, Yanta Road, Shaanxi, Xi'an Patentee before: XI'AN University OF SCIENCE AND TECHNOLOGY |