CN104865452B  Not transposed transmission line electric capacity antijamming measurement methods based on harmonic component  Google Patents
Not transposed transmission line electric capacity antijamming measurement methods based on harmonic component Download PDFInfo
 Publication number
 CN104865452B CN104865452B CN201510331077.1A CN201510331077A CN104865452B CN 104865452 B CN104865452 B CN 104865452B CN 201510331077 A CN201510331077 A CN 201510331077A CN 104865452 B CN104865452 B CN 104865452B
 Authority
 CN
 China
 Prior art keywords
 lt
 gt
 mi
 mn
 mrow
 Prior art date
Links
 230000005540 biological transmission Effects 0.000 title claims abstract description 36
 230000001360 synchronised Effects 0.000 claims abstract description 13
 238000005516 engineering processes Methods 0.000 claims abstract description 10
 238000000819 phase cycle Methods 0.000 claims description 6
 238000000034 methods Methods 0.000 claims description 2
 238000004364 calculation methods Methods 0.000 description 5
 238000010168 coupling process Methods 0.000 description 3
 238000000691 measurement method Methods 0.000 description 2
 238000004458 analytical methods Methods 0.000 description 1
 238000010276 construction Methods 0.000 description 1
 230000000694 effects Effects 0.000 description 1
Abstract
Description
Technical field
The present invention relates to a kind of transmission line of electricity capacitance parameter accurate measurement method, content is not replacing based on harmonic component Transmission line of electricity electric capacity antijamming measurement methods.
Background technology
Transmission line parameter is Load flow calculation in power system, power attenuation calculating, short circuit calculation, accident analysis and relay The important foundation data that protection seting calculates.There is no accurate line parameter circuit value, just can not ensure the accuracy of abovementioned calculating, and then Being failure to actuate or malfunctioning for protective relaying device and other automatics may be caused.Therefore, transmission line of electricity is obtained exactly Parameter has highly important meaning to the normal operation of power system.
With the rapid development of power system in recent years, because transmission of electricity corridor is crowded and overhead line structures expenditure of construction is high, coupling The quantity for closing transmission line of electricity is continuously increased so that the electromagnetic interference between circuit is further serious, to accurate measurement transmission line parameter Bring very big difficulty.
At present, the calculating and measurement on transmission line of electricity have achieved many achievements.Obtain the main of transmission line parameter Method includes theoretical calculation method and field survey method.And because the soil resistivity of the earth can be with the geography below circuit Changes in environmental conditions and change, and calculating method have ignored influence of the electromagnetic interference of weather and neighbouring circuit to line parameter circuit value, especially It is the influence to Zero sequence parameter.Therefore, it is necessary to which field survey should be carried out to transmission line parameter.
But in actually measuring, below 200km transmission lines of electricity do not replace mostly circuit, between the circuit that causes not replace Interference enhancing, because nearby induced voltage phasor of the threephase line in measurement circuitry of other circuits that do not replace and being not zero. Especially under strong interference environment, neighbouring coupling circuit can induce larger powerfrequency voltage in measurement circuitry, i.e. power frequency is done Disturb, the very big error of band can be carried out to circuit power frequency parameter measuring.
Due to interference voltage can with neighbouring Line Flow change and change, and the interference electric current as caused by interference voltage without Method measures, and therefore, it is difficult to realize that interference voltage and interference electric current are included into calculation formula in practice.In most of electricity Hold in the actual measurement of parameter, employ the measuring method for not considering interference, cause measurement error larger, reality can not be met Engineering survey demand.
The content of the invention
The present invention mainly solve present in prior art because the circuit that do not replace nearby is brought compared with disturbance of industry frequency and The drawbacks of causing measurement error larger；Provide a kind of not transposed transmission line Xc interferometry side based on harmonic component Method, this method can eliminate the influence that Hz noise is brought, and accurately measure all capacitance parameters of circuit, including zero sequence electric capacity, The parameters such as the mutual capacitance between positive sequence electric capacity, negative phasesequence electric capacity and different sequences.
The abovementioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
Not transposed transmission line electric capacity antijamming measurement methods based on harmonic component, it is characterised in that define power transmission line The circuit b compositions of the test line a having a power failure and charging operation are route, and are formed per loop line road by threephase line.Measuring process Including：
Step 1, by stepup transformer (transformer of the lower energy saturation of zero load), threephase work is applied in measurement circuitry a head ends Frequency voltage, circuit a ends threephase open circuit (end current 0).Utilize the synchronous measuring apparatus synchronous acquisition line based on GPS technology The threephase voltage of road a head endsThe threephase voltage of endWith the threephase current of head end
Step 2, A phases and the wiring position of B phases and test line in head end three phase mains are exchanged, using based on GPS technology Synchronous measuring apparatus synchronous acquisition circuit a head ends threephase voltageThe threephase voltage of endWith the threephase current of head end
Step 3, A phases and the wiring position of C phases and test line in head end three phase mains are exchanged, using based on GPS technology Synchronous measuring apparatus synchronous acquisition circuit a head ends threephase voltageThe threephase voltage of endWith the threephase current of head end
Step 4, to the threephase of the three groups of head and ends obtained under three kinds of independent metering systems of step 1, step 2 and step 3 Voltage and threephase current data, using adding FFT (Fast Fourier Transform (FFT)) interpolation algorithm of Hanning window to handle, obtain three groups of first and last The threephase voltage at both ends and the thirdharmonic component of threephase current, including：
Under measuring for the first time, the thirdharmonic component of circuit a head end threephase voltagesEnd threephase The thirdharmonic component of voltageWith the thirdharmonic component of head end threephase current
Under second measures, the thirdharmonic component of circuit a head end threephase voltagesEnd threephase The thirdharmonic component of voltageWith the thirdharmonic component of head end threephase current
Under third time measures, the thirdharmonic component of circuit a head end threephase voltagesEnd threephase The thirdharmonic component of voltageWith the thirdharmonic component of head end threephase current
Step 5, by the third harmonic voltage and triple harmonic current of three groups of circuit head and ends above, and circuit mould Type, it can obtain：
Wherein, Y_{3}For admittance matrix of the circuit under third harmonic frequencies：
Y_{a3}For the admittance being measured under circuit A phase third harmonic frequencies, Y_{b3}To be measured circuit B phase third harmonic frequencies Under admittance, Y_{c3}For the admittance being measured under circuit C phase third harmonic frequencies, Y_{ab3}、Y_{ac3}、Y_{bc3}To be measured circuit difference two Transadmittance between phase under third harmonic frequencies.
Solve equation and try to achieve admittance matrix Y_{3}。
Step 6, the phase admittance matrix under measured circuit third harmonic frequencies is converted to the sequence electric capacity under fundamental frequency Matrix, because line conductance parameter is minimum, therefore ignore.Simultaneously divided by line length l, the electric capacity for obtaining every km are joined Number, including zero sequence electric capacity C_{0}, positive sequence electric capacity C_{1}, negative phasesequence electric capacity C_{2}And the mutual capacitance C between different two sequences_{01}、C_{02}、C_{10}、C_{12}、 C_{20}、C_{21}。
In above formula, l is line length, and w=2 π f, f are mains frequency.Technical scheme provided by the present invention, which proposes, to be based on The not transposed transmission line electric capacity antijamming measurement methods of harmonic component, by saturation transformer under zero load in circuit is measured Caused triplefrequency harmonics, utilize the threephase voltage and threephase of the synchronous measuring apparatus measurement circuitry head and end based on GPS technology Electric current, using adding the FFT interpolation algorithms of Hanning window to handle the voltage and current of circuit head and end, obtain the three of head and end The thirdharmonic component of phase voltage and threephase current.Simultaneously in view of mutually parameter is unequal between the circuit twophase that do not replace, utilize Harmonic component solves the selfadmittance of all phases and alternate transadmittance, and then obtains being measured the orderly capacitance parameter of institute of circuit.
The invention has the characteristics that：
(1) calculated using harmonic component, harmonic wave " is turned bane into boon ", has filtered out shadow of the neighbouring circuit Hz noise to measurement Ring, drastically increase the measurement accuracy of line capacitance；
(2) pressurize to obtain three groups of measurement data respectively using power supply commutation, operation is very convenient；
(3) utilize circuit threephase voltage and threephase current data, can disposably measure orderly capacitance parameter；
(4) situation of neighbouring linehit once is applicable not only to, is also applied for the feelings for nearby there are multi circuit transmission lines to disturb Condition；
(5) the accurate measurement of realizing transmission line of electricity capacitance parameter of the inventive method under strong interference environment, improve electric power The accuracy and raising power supply reliability that system relay protection is adjusted have positive role.
Brief description of the drawings
Accompanying drawing 1 is that superpressure returns/double back bipolar transmission line road equivalent schematic with tower four.
Accompanying drawing 2 is the distributed parameter model schematic diagram of superpressure transmission line with fourcircuit on single tower.
Accompanying drawing 3 is superpressure transmission line with fourcircuit on single tower locus floor map.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
Technical solution of the present invention is described in detail below in conjunction with drawings and examples.
1. the not transposed transmission line Xc interferometry based on harmonic component, embodiment comprise the following steps：
Step 1, measured dead line a, the circuit b of neighbouring charging operation are selected.
It is shown in Figure 1, by stepup transformer (the lower energy saturation transformer of zero load), apply in measured circuit a head ends Threephase mainfrequency voltage, circuit a terminal open circuits (end current 0).Error, which is obtained, using GPS timing function is less than 1 microsecond Time reference, under gps time synchronization, embodiment gathers the threephase voltage of circuit a head ends simultaneouslyEnd Threephase voltageWith the threephase current of head endAnd it will be surveyed in a manner of file Data are measured to preserve.
Step 2, A phases and the wiring position of B phases and circuit in head end three phase mains are exchanged, is obtained using GPS timing function The time reference that error is less than 1 microsecond is obtained, under gps time synchronization, embodiment gathers the threephase voltage of circuit a head ends simultaneouslyThe threephase voltage of endWith the threephase current of head end And measurement data is preserved in a manner of file.
Step 3, A phases and the wiring position of C phases and circuit in head end three phase mains are exchanged, is obtained using GPS timing function The time reference that error is less than 1 microsecond is obtained, under gps time synchronization, embodiment gathers the threephase voltage of circuit a head ends simultaneouslyThe threephase voltage of endWith the threephase current of head end
Step 4, the file that gained measurement data preserves under three kinds of independent metering systems is aggregated into a computer, Under each independent metering system, after the pressurization of head and end equal line taking road in some time (such as between 0.2 second to 0.4 second) measurement Data, add the FFT interpolation algorithms of Hanning window to handle, obtain the threephase voltage of three groups of head and ends and the triplefrequency harmonics of threephase current Component, including：
Under measuring for the first time, the thirdharmonic component of circuit a head end threephase voltagesEnd threephase The thirdharmonic component of voltageWith the thirdharmonic component of head end threephase current
Under second measures, the thirdharmonic component of circuit a head end threephase voltagesEnd threephase The thirdharmonic component of voltageWith the thirdharmonic component of head end threephase current
Under third time measures, the thirdharmonic component of circuit a head end threephase voltagesEnd threephase The thirdharmonic component of voltageWith the thirdharmonic component of head end threephase current
Voltage unit in the present invention is all volt, and current unit is all ampere.
The FFT interpolation algorithms for adding Hanning window are prior art, and it will not go into details by the present invention.
Step 5, circuit model shown in Figure 2, by the third harmonic voltage and triplefrequency harmonics of three groups of circuit head and ends Electric current substitutes into formula (A1),
Solution formula (A1) obtains the admittance matrix Y under circuit third harmonic frequencies_{3}。
Wherein：
Step 6, by Y_{3}Substitution formula (A3)
Solution obtains all capacitance parameters, including zero sequence electric capacity C_{0}, positive sequence electric capacity C_{1}, negative phasesequence electric capacity C_{2}And different two sequences Between mutual capacitance C_{01}、C_{02}、C_{10}、C_{12}、C_{20}、C_{21}.Capacitance parameter unit is nF/km.
To illustrate the invention for the sake of effect, by taking commontower doublereturn 220kV coupling power transmission lines a, b as an example, transmission line of electricity a is quilt The circuit of measurement, transmission line of electricity b are the circuit of charging operation, and its locus is distributed referring to Fig. 3.
Transmission line of electricity a theoretical capacitance parameter is as follows.
Additional threephase voltage is 10kV, and when circuit a length is 50km, the conventional method calculated using fundametal compoment is surveyed The capacitance parameter measured is
Additional threephase voltage is 10kV, and when circuit a length is 50km, the inventive method measurement result is
From above result of calculation, the measurement error of conventional method sequence mutual capacitance is very big, zero sequence, positive sequence electric capacity (negative phasesequence Electric capacity is equal to positive sequence electric capacity) measurement error is also larger.And the inventive method can accurately measure the orderly capacitance parameter of institute.
Table 1, which provides, is respectively adopted the inventive method and circuit zero sequence electric capacity, positive sequence electric capacity that conventional method measurement obtains (negative phasesequence electric capacity is equal to positive sequence electric capacity) parameter measurement error and transmission line length relation.
Table 1 utilizes the line capacitance measurement error that the inventive method measures and line length relation
As it can be seen from table 1 the measurement error of two methods can increase with the increase of line length, but 200km Circuit above can use threephase to replace so that threephase symmetrical, interference is smaller, therefore 200km Above Transmission Lines measurements are not considered.
Conventional method measures the capacitance parameter of the circuit, when line length changes from 15km to 200km, zero sequence capacitance measurement Error increases to 29.969% from 12.186%, and positive sequence capacitance measurement error then increases to 27.163% by 12.891%, therefore Traditional measurement method can not meet the requirement of measurement accuracy.
The capacitance parameter of the circuit is measured with the inventive method, when line length changes from 15km to 200km, zero sequence electric capacity Measurement error increases to 1.6818% from 0.1045%, and positive sequence capacitance measurement error then increases to 1.7284% by 0.1341%, Engineering survey requirement can be met.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (3)
Priority Applications (1)
Application Number  Priority Date  Filing Date  Title 

CN201510331077.1A CN104865452B (en)  20150615  20150615  Not transposed transmission line electric capacity antijamming measurement methods based on harmonic component 
Applications Claiming Priority (1)
Application Number  Priority Date  Filing Date  Title 

CN201510331077.1A CN104865452B (en)  20150615  20150615  Not transposed transmission line electric capacity antijamming measurement methods based on harmonic component 
Publications (2)
Publication Number  Publication Date 

CN104865452A CN104865452A (en)  20150826 
CN104865452B true CN104865452B (en)  20171128 
Family
ID=53911423
Family Applications (1)
Application Number  Title  Priority Date  Filing Date 

CN201510331077.1A CN104865452B (en)  20150615  20150615  Not transposed transmission line electric capacity antijamming measurement methods based on harmonic component 
Country Status (1)
Country  Link 

CN (1)  CN104865452B (en) 
Families Citing this family (2)
Publication number  Priority date  Publication date  Assignee  Title 

CN105223449A (en) *  20151028  20160106  中国南方电网有限责任公司电网技术研究中心  A kind of asymmetric power transmission line parameter online measurement method 
CN107037250B (en) *  20161116  20200211  武汉大学  Asymmetric alternatingcurrent transmission line phase parameter measuring method based on distributed parameter model 
Citations (5)
Publication number  Priority date  Publication date  Assignee  Title 

WO2004001431A1 (en) *  20020620  20031231  Abb Ab  Fault location using measurements of current and voltage from one end of a line 
CN102129009A (en) *  20110110  20110720  武汉大学  Method for measuring positive sequence parameters of ultrahigh voltage transmission line based on double end measuring information 
CN102135571A (en) *  20110303  20110727  江苏省电力公司苏州供电公司  Antiinterference measurement method for zero sequence impedance of superhighvoltage/ultrahighvoltage multiloop power transmission line 
CN102323488A (en) *  20110530  20120118  武汉大学  Antijamming measuring method for power transmission line positivesequence capacitance based on harmonic component 
CN102323487A (en) *  20110530  20120118  武汉大学  Antijamming measuring method for power transmission line zerosequence capacitance based on harmonic component 

2015
 20150615 CN CN201510331077.1A patent/CN104865452B/en active IP Right Grant
Patent Citations (5)
Publication number  Priority date  Publication date  Assignee  Title 

WO2004001431A1 (en) *  20020620  20031231  Abb Ab  Fault location using measurements of current and voltage from one end of a line 
CN102129009A (en) *  20110110  20110720  武汉大学  Method for measuring positive sequence parameters of ultrahigh voltage transmission line based on double end measuring information 
CN102135571A (en) *  20110303  20110727  江苏省电力公司苏州供电公司  Antiinterference measurement method for zero sequence impedance of superhighvoltage/ultrahighvoltage multiloop power transmission line 
CN102323488A (en) *  20110530  20120118  武汉大学  Antijamming measuring method for power transmission line positivesequence capacitance based on harmonic component 
CN102323487A (en) *  20110530  20120118  武汉大学  Antijamming measuring method for power transmission line zerosequence capacitance based on harmonic component 
NonPatent Citations (2)
Title 

利用电压及电流双端测量信息的高压输电线路正序参数测量方法及应用;李炜等;《电网技术》;20110430;第35卷(第4期);第103107页 * 
输电线路零序阻抗参数测量方法;胡志坚等;《电力科学与技术学报》;20100930;第25卷(第3期);第2531页 * 
Also Published As
Publication number  Publication date 

CN104865452A (en)  20150826 
Similar Documents
Publication  Publication Date  Title 

Teng et al.  Backward/forward sweepbased harmonic analysis method for distribution systems  
Phadke et al.  Recent developments in state estimation with phasor measurements  
Suonan et al.  Distance protection for HVDC transmission lines considering frequencydependent parameters  
Liao et al.  Online optimal transmission line parameter estimation for relaying applications  
CN103078316B (en)  Network voltage disturbance generating device and control method thereof  
Chen et al.  Traction system unbalance problemanalysis methodologies  
CN101551432B (en)  Power distribution network fault positioning method  
Suonan et al.  A novel faultlocation method for HVDC transmission lines  
CN103135031B (en)  Coal mine highvoltage grid system insulation state monitoring method  
CN102928704B (en)  Intelligent diagnosis method for corrosion failure point of transformer substation grounding grid  
Ngu et al.  A combined impedance and traveling wave based fault location method for multiterminal transmission lines  
CN102435851B (en)  Method for measuring zerosequence parameters of doublecircuit transmission lines  
Kang et al.  A faultlocation algorithm for seriescompensated doublecircuit transmission lines using the distributed parameter line model  
CN103226176B (en)  A kind of wire selection method for power distribution network single phase earthing failure  
CN104569744B (en)  A kind of synthesis oneend fault localization method suitable for distribution network line  
CN103018534B (en)  Determine the method and system of harmonic voltage  
CN102208807A (en)  Medium and low voltage distribution network energy efficiency evaluation method based on accurate load measurement data  
CN103197202B (en)  Distribution network fault line selection method based on wavelet coefficient correlation analysis in threephase breaking current component characteristic frequency band  
Kang et al.  A fault location algorithm based on circuit analysis for untransposed parallel transmission lines  
CN103336265B (en)  Electric energy meter error in dipping Quantitative Analysis Method under a kind of harmonic background  
CN101183133A (en)  Phase amount and zero sequence amount combined realization powerline bothend distance measuring method  
Song et al.  A faultlocation method for VSCHVDC transmission lines based on natural frequency of current  
CN103399203B (en)  A kind of Highprecision harmonic parameter estimation method based on composite iterative algorithm  
CN103630814B (en)  High tension cable is at cross interconnected lower insulation dielectric loss angle trend online monitoring method  
CN101894191B (en)  Method for simulating coupling between vehicle and traction network and power system 
Legal Events
Date  Code  Title  Description 

C06  Publication  
PB01  Publication  
EXSB  Decision made by sipo to initiate substantive examination  
SE01  Entry into force of request for substantive examination  
GR01  Patent grant  
GR01  Patent grant 