CN102565542A - Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard - Google Patents

Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard Download PDF

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CN102565542A
CN102565542A CN2012100310174A CN201210031017A CN102565542A CN 102565542 A CN102565542 A CN 102565542A CN 2012100310174 A CN2012100310174 A CN 2012100310174A CN 201210031017 A CN201210031017 A CN 201210031017A CN 102565542 A CN102565542 A CN 102565542A
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iec61850
voltage
frequency
dielectric loss
standard
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CN2012100310174A
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CN102565542B (en
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张斌
周斌
沈建
杨小铭
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国电南瑞科技股份有限公司
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Abstract

The invention discloses a capacitive equipment medium loss online monitoring method based on an IEC61850-9-2 sampling standard in an intelligent substation. According to the invention, medium loss measurement based on the IEC61850-9-2 sampling standard in the intelligent substation can be realized. Through fiber B code timing, synchronization acquisition of a reference voltage and a leakage current can be realized. Through a high-precision zero-flux mutual inductor and a 16 bit AD, the acquisition of the leakage current can be realized. Through a resampling algorithm and a software frequency tracking algorithm, rejection of an interference signal and full period sampling can be realized. And high-precision online monitoring of the capacitive equipment medium loss can be realized. By using the method of the invention, a medium loss measurement problem based on the digital sampling in the intelligent substation can be solved.

Description

Capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard

Technical field

The invention belongs to power equipment on-line monitoring technique field, the present invention relates in the intelligent substation capacitive apparatus medium loss on-line monitoring method more precisely based on the IEC61850-9-2 standard for manual sampling.

Background technology

Since 2010, the construction of intelligent substation progressively becomes the main flow of newly-built transformer station, and will attract the growth of explosion type in the future.Stress during intelligent substation is built progressively to realize the repair based on condition of component of primary equipment and the timely early warning of fault, accomplish few maintenance, non-maintaining, avoid because power outage and the casualties that equipment failure causes through on-line monitoring to the primary equipment state.The capacitor type power equipment occupies very big ratio in power transmission and transformation system; Like bushing shell for transformer, lightning arrester etc.; These power equipments receive effect of factors such as electricity, heat, rugged surroundings and wear out in operational process, decreasing insulating becomes accident potential.Dielectric loss is the important insulation index of reflection capacitor type power equipment insulation status, and the stable operation of power equipment is had a very important role.The on-line monitoring of strengthening capacitive apparatus has huge social and economic benefit.

Capacitive apparatus medium loss measurement principle is as shown in Figure 1.The voltage signal Un that dielectric loss measurement is gathered bus PT is transformed to the U2 signal that the end screen current signal of ac voltage signal U1 and the measured capacitance type equipment Cx of low-voltage grade produces through high precision low current sensor (CT) through voltage transformer (VT).U1 and U2 insert the modulate circuit and the AD sample circuit of dielectric loss measurement unit through cable; Under the control of CPU; The signal acquiring system of U1 and U2 starts simultaneously; Analog voltage signal to sensor output carries out synchronized sampling, calculates the phase differential Ph of capacitance type equipment end screen current signal Ix with respect to busbar voltage Un then, thereby obtains parameters such as dielectric loss tan δ and capacitance Cx.The sampling precision of the synchronized sampling control technology of measuring unit, little electric current, frequency-tracking and the humorous rejecting that involves undesired signal are the keys that guarantees the dielectric loss measurement precision.

Document one " capacitor type power equipment dielectric loss on-line monitoring method and device " (one Chinese patent application number 200410026133.2) has disclosed a kind of method and apparatus of on-line monitoring capacitor type power equipment dielectric loss.This method is with the voltage transformer (VT) signal of substation bus bar voltage and be installed in high precision low current sensor signal on the equipment ground line inserts Control Room through cable the computer PCI capture card and calculate.There is following problem in this method: the one, and do not carry out mains frequency and follow the tracks of, can not guarantee integer-period sampledly, there are fence effect and leakage effect, especially give the phase place great errors for the frequency spectrum that calculates; The 2nd, voltage signal and end screen current signal fail to change on the spot collection, but handle through the computing machine that cable is moved Control Room to, because mutual inductor output is weak signal, is inappropriate for the transmission of long distance, and receives interference from outside signals easily; The 3rd, the AD conversion chip adopts 8 resolution can not satisfy the feeble signal measuring accuracy requirement of leakage current; The 4th, do not meet the requirement of the digitized sampling of intelligent substation, the measurement of busbar voltage can not be satisfied through merge cells and samples, and is not suitable for the designing requirement of intelligent substation.

In intelligent substation; Measurement for the voltage and current signal; Extensively adopting merge cells that signal is carried out digitizing on the spot, is that communication media sends the crude sampling value of measuring to functional units such as measurement, protection, record ripple, dynamic vector with optical fiber through the IEC61850-9-2 standard.No longer adopt the mode of cable laying that simulating signals such as voltage, electric current are inserted the measurement protected location.In the intelligent substation design, will can not gather voltage signal for dielectric loss measurement unit single pavement cable based on unified consideration.And the dielectric loss measurement unit needs the voltage signal of bus PT, and this application of decreasing the on-line measurement unit for traditional Jie has brought problem.Must the development capacitive apparatus medium loss on-line monitoring unit based on the IEC61850-9-2 standard of new generation.

Document two " based on the capacitive apparatus medium loss factor on-line monitoring method of DSP " (the 71st page of Automation of Electric Systems number the 28th the 19th phase of volume in October, 2004) has disclosed a kind of capacitive apparatus medium loss on-line monitoring method based on DSP.This method has considered to influence the factors such as signal interference, harmonic effects and mains frequency influence of fluctuations of measuring accuracy.But it is sampled as the sampling of conventional analogue amount, and the frequency tracking algorithm of its introduction is not suitable for the digitized sampling requirement based on the IEC-61850-9-2 standard.

Document three " be used for Jie based on the harmonic analysis method that adds the Hanning window interpolation and decrease the angular measurement quantitative analysis " (the 81st page of Automation of Electric Systems number the 30th the 2nd phase of volume in January, 2006) has disclosed a kind of harmonic analysis method that adds the Hanning window interpolation and can alleviate the influence of non-synchronous sampling to the dielectric loss angular measurement.At first this method is based on analog acquisition equally and is not suitable for the intelligent substation based on digitized sampling.Secondly do not carry out frequency-tracking, its introduction just alleviate non-integer-period sampled influence based on the harmonic analysis method that adds the Hanning window interpolation to the dielectric loss angular measurement, realize integer-period sampled through frequency-tracking.

Summary of the invention

Goal of the invention of the present invention is:

1, in the intelligent substation; Gather bus PT voltage through the merge cells in-site collecting; Can not satisfy the requirement of present dielectric loss measurement unit through the cable mode incoming analog signal, the present invention need solve in the intelligent substation dielectric loss measurement method based on the IEC61850-9-2 standard sample;

2, gathering bus PT voltage is not same merge cells with the merge cells of gathering leakage current, and the synchronous acquisition that how to guarantee 2 road signals is the key of accurate measuring media loss;

3, how to suppress in the signal dc shift and electrical network 3 times, 5 times, 7 subharmonic influence to the measuring accuracy of dielectric loss angle;

4, under the situation of mains frequency fluctuation, how to realize frequency-tracking, prevent spectrum leakage and fence effect based on the dielectric loss measurement unit of IEC61850-9-2 standard sample.

To achieve these goals, the present invention takes following technical scheme to realize:

A kind of capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard is characterized in that, comprises the following steps:

1) socket high precision zero flux leakage current transformer on the capacitive apparatus ground wire inserts local mounted dielectric loss measurement unit with the voltage signal of mutual inductor output, according to the AD sampling of the branch pulse signal enabling leakage current of B sign indicating number output;

2) bus or circuit reference voltage are measured through merge cells on the spot, the dielectric loss measurement unit inserts the reference voltage sampled value information of the IEC61850-9-2 standard of merge cells collection through optical fiber; Sampled value is resampled and carries out Fourier transform, calculate amplitude, phase angle and frequency, adjustment resampling frequency is carried out frequency-tracking;

3) carry out Fourier transform according to the leakage current sampled signal of step 1) collection, calculate the phase place and the amplitude of leakage current, integrating step 2) amplitude and the phase place of the reference voltage of the synchronization of calculating dielectric loss value.

Aforesaid capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard; It is characterized in that: the algorithm that resamples said step 2) is: establishing fs is the merge cells SF; Ts is the corresponding sampling period; Fs ' is a dielectric loss measurement unit weighs SF, and Ts ' is the corresponding resampling cycle, then

Ts ′ = fs fs ′ Ts

T(n)=T(n-1)+Ts′

T (n) is the interpolation point position, and floating number T (n-1) is last point interpolation point position, and establishing m is the maximum integer less than T (n), and establishes floating number u=T (n), and then the linear interpolation formula is following:

x′(n)=x(m)*(m+1-u)+x(m+1)*(u-m)

In the formula, x ' is attach most importance to n point in the sample sequence (n), and x (m) is the m point value in the former sample sequence, and x (m+1) is the m+1 point value in the former sample sequence.

Aforesaid capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard is characterized in that: in said step 2) in, the step of frequency-tracking is following:

21) reference voltage signal Ux is carried out the Fourier transform of complete cycle ripple;

22) the Fourier transform result is carried out Filtering Processing;

23) utilize the phase differential of the adjacent cycle of filtered first-harmonic vector calculation

24) using the phase difference Calculate frequency change

25) calculate original signal frequency f=f s-Δ f;

26) according to the up-to-date frequency values that calculates, adjustment resamples at interval, returns step 21).

Aforesaid capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard is characterized in that: the amplitude of the reference voltage of synchronization and phase place obtain be through internal clock time service unit, station through 2 road optical fiber B sign indicating numbers to the time signal discontinuity surface when inserting merge cells and the realization of dielectric loss measurement unit respectively to reference voltage and Leakage Current information same information acquisition.

The beneficial effect that the present invention reached: in the present invention; Disclosed the dielectric loss measurement method of a kind of basis based on digital signal samples; Employing based on full station GPS to the time the B sign indicating number to the time realize synchronized sampling; Utilize high precision zero flux leakage current transformer and high resolution A to guarantee sampling with high precision, utilize Fourier transform and frequency tracking algorithm to guarantee measuring accuracy.Adopt method of the present invention, can solve present intelligent substation build in based on the capacitive power equipment dielectric loss measurement problem of full station digitized sampling.And proposed a kind of because gordian technique solutions such as the synchronized sampling that digitized sampling is brought, frequency-trackings.In this scheme based on optical fiber B sign indicating number to the time to time error less than 1 μ s, the measuring accuracy of frequency reaches 0.003Hz, satisfies the measurement requirement of dielectric loss fully.Precision and the stability measured have been guaranteed through the use of changing collection, high precision mutual inductor and high resolution A chip on the spot to leakage current.More traditional metering system has been avoided because the long distance of small-signal transmits the signal attenuation that brings and is subject to problem such as external disturbance.In addition, digital collection on the spot uses optical fiber to replace cable, can practice thrift the cost of transformer substation construction, improves sharing of information, meets the theories such as economical environment-protective of intelligent substation.

Description of drawings

Fig. 1 is traditional capacitive power equipment dielectric loss measurement schematic diagram;

Fig. 2 forms and structured flowchart with the capacitive apparatus medium loss measurement system based on the IEC61850-9-2 standard that the present invention implements;

Fig. 3 is the core plate hardware structure diagram that explanation realizes dielectric loss measurement device of the present invention;

Fig. 4 is explanation realizes dielectric loss measurement method of the present invention with program a algorithm flow chart.

Embodiment

Capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard; The dielectric loss measurement unit is through gathering reference voltage signal with merge cells with IEC61850-9-2 standard traffic mode; Through optical fiber B sign indicating number to the time realize the synchronous acquisition of reference voltage and leakage current; Realize collection through high precision zero magnetic flux mutual inductor and 16 AD to leakage current; Realize the rejecting of undesired signal and integer-period sampled is realized the high accuracy in line monitoring of capacitive apparatus medium loss through resampling algorithm and software frequency tracking algorithm, may further comprise the steps:

1) socket high precision zero flux leakage current transformer on the equipment ground line; The voltage signal of mutual inductor output is inserted local mounted dielectric loss measurement unit (U1); Be used to measure the leakage current signal of capacitive apparatus; U1 have the B sign indicating number to the time interface, utilize the branch pulse signal enabling AD sampling of B sign indicating number output;

2) AC sampling (SV) interface (optical fiber port) with U1 inserts merge cells output interface or the corresponding AC sampling network (SV net) of gathering reference voltage through optical fiber, and the sampled value information band of its collection has markers;

3) in U1 based on time scale information alignment leakage current signal and reference voltage signal; Because what merge cells adopted at present is the SF of 80 points/cycle; Need resample, carry out signal processing method such as spectrum analysis according to the resampling data and obtain parameters such as angular difference, leakage current, frequency, electric capacity, resample at interval at last according to the frequency adjustment that calculates; Realize integer-period sampledly, improve measuring accuracy and stability.Specific algorithm is following:

31) raw data that is combined the unit resamples:

If fs is the merge cells SF, Ts is the corresponding sampling period, and fs ' is a dielectric loss measurement unit weighs SF, and Ts ' is the corresponding resampling cycle, then

Ts ′ = fs fs ′ Ts

T(n)=T(n-1)+Ts′

T (n) is the interpolation point position, is generally floating number, and establishing m is the maximum integer less than T (n), and establishes floating number u=T (n), and then the linear interpolation formula is following:

x′(n)=x(m)*(m+1-u)+x(m+1)*(u-m)

32) resampling is carried out Fourier transform after finishing, and calculates amplitude and phase angle,

Fourier transform results can be expressed as:

U x = U o + Σ k = 1 N U km sin ( kωt + α k )

I x = I o + Σ k = 1 N I km sin ( kωt + β k )

In the formula, the reference voltage of Ux for measuring, U oBe its DC component, U KmBe the amplitude of its each harmonic, α kPhase angle for each harmonic.I xBe the Leakage Current of measuring, I oBe its DC component, I KmBe the amplitude of its each harmonic, β kBe the phase angle of each harmonic, k is an overtone order, and N is maximum overtone order, and t is the time, and ω is the signal angular frequency.

Obtain voltage, current first harmonics phase angle α 1And β 1After, can be situated between and decrease the angle:

tanδ=tan[90°-(β 11)]

33) carry out frequency-tracking, step is following:

331) reference voltage signal Ux is carried out the Fourier transform of complete cycle ripple;

332) the Fourier transform result is carried out Filtering Processing;

333) utilize the phase differential of the adjacent cycle of filtered first-harmonic vector calculation

334) using the calculate the frequency variation

335) calculate original signal frequency f=f s-Δ f;

4) according to the up-to-date frequency values that calculates, adjustment resamples at interval, returns step 1).

Be a preferred embodiment of the present invention below, comprised a concrete dielectric loss measurement unit that adopts method of the present invention to realize based on the 61850-9-2 standard.Other characteristic, purpose and advantage of the present invention also can be found out from the explanation of embodiment and accompanying drawing.

Can see that from accompanying drawing 2 capacitive apparatus medium loss measurement system has comprised mutual inductor, clock unit, merge cells, dielectric loss measurement unit, comprehensive monitoring unit or station end monitoring means.Clock unit through wireless time benchmark or wired time reference signal receive to the time information.With the optical fiber B sign indicating number that produces to the time signal through optical fiber pass to merge cells, dielectric loss measurement unit and other need to the time device.Merge cells is installed in the outdoor cabinet on the spot, converts reference voltage signal into digital signal on the spot and gives the dielectric loss measurement unit and measure protective device.The dielectric loss measurement unit accept the B sign indicating number to the time signal, gather leakage current signal and accomplish with reference voltage signal synchronously and the calculating of dielectric loss amount etc.The dielectric loss unit is with giving station level monitoring system or comprehensive monitoring unit on result of calculation and the data.

Accompanying drawing 3 is hardware structure figure of dielectric loss measuring set core plate.High-performance embedded processor P owerPC is responsible for 2 road serial line interfaces among the figure, and wherein 1 the tunnel is the RS232 debug port, and other one the tunnel is the station level system communication interface that is used to adopt RS485 communication.Fiber optic Ethernet communication port 1 is used for communicating interface with intelligent transformer assembly master's intelligent electronic device or station level analytic system.Fiber optic Ethernet communication port 2 is used for the IEC61850-9-2 standard traffic with merge cells.The PowerPC processor also accomplish simultaneously the dielectric loss algorithm calculating and with the signal procedure of outside.The FPGA implement device to the time system and AD signal synchronized sampling.Outside FLASH is used for the storage of program.

Accompanying drawing 4 is process flow diagrams of application program in the flush bonding processor of dielectric loss measurement unit.In process flow diagram, be divided into vectorial angle, amplitude and frequency computation part module that one of two module are reference voltages.Another module is phase angle, amplitude and the dielectric loss computing module of leakage current.

1. dielectric loss measurement unit in first module and merge cells communicator program deposit the reference voltage of the IEC61850-9-2 standard that receives in buffer area; 2. buffer area IEC61850-9-2 data are resolved the whole branch of extraction original sampling data constantly; To the original value of resampling 3. and the counterweight sampled data carry out spectrum analysis and filtering, calculate whole amplitude of dividing first-harmonic vector constantly and phase angle 4..Phase angle information according to a last cycle calculates phase angle difference, calculates the difference of current calculated rate and actual frequency according to phase angle difference, according to the current calculated rate of frequency difference correction 5..According to sampling period of the resampling frequency of current calculated rate adjustment voltage signal and leakage current 6..

SF that 6. second module calculate according to step in the module one and B sign indicating number to the time information whole divide start leakage current constantly sampling 7..Sampled data is carried out Fourier transform, calculate vectorial amplitude of first-harmonic and phase angle 8..Wait for the 4. result of calculation in step, obtain the phase information of synchronization reference voltage, calculate dielectric loss.

The present invention is illustrated according to the preferred embodiment, should be appreciated that but the foregoing description does not limit the present invention in any form, and all employings are equal to the technical scheme that form obtained of replacement or equivalent transformation, all drop within protection scope of the present invention.

Claims (4)

1. based on the capacitive apparatus medium loss on-line monitoring method of IEC61850-9-2 standard, it is characterized in that, comprise the following steps:
1) socket high precision zero flux leakage current transformer on the capacitive apparatus ground wire; The voltage signal of mutual inductor output is inserted local mounted dielectric loss measurement unit, and the dielectric loss measurement unit is according to the AD sampling of the branch pulse signal enabling leakage current of B sign indicating number output;
2) bus or circuit reference voltage are measured through merge cells on the spot, the dielectric loss measurement unit inserts the reference voltage sampled value information of the IEC61850-9-2 standard of merge cells collection through optical fiber; Sampled value is resampled and carries out Fourier transform, calculate amplitude, phase angle and frequency, adjustment resampling frequency is carried out frequency-tracking;
3) carry out Fourier transform according to the leakage current sampled signal of step 1) collection, calculate the phase place and the amplitude of leakage current, integrating step 2) amplitude and the phase place of the reference voltage of the synchronization of calculating dielectric loss value.
2. the capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard according to claim 1; It is characterized in that: the algorithm that resamples said step 2) is: establishing fs is the merge cells SF; Ts is the corresponding sampling period; Fs ' is a dielectric loss measurement unit weighs SF, and Ts ' is the corresponding resampling cycle, then
Ts ′ = fs fs ′ Ts
T(n)=T(n-1)+Ts′
Floating number T (n) is current interpolation point position, and it is the maximum integer less than T (n) that floating number T (n-1) establishes m for last interpolation point position, and establishes floating number u=T (n), and then the linear interpolation formula is following:
x′(n)=x(m)*(m+1-u)+x(m+1)*(u-m)
In the formula, x ' is attach most importance to n point in the sample sequence (n), and x (m) is the m point value in the former sample sequence, and x (m+1) is the m+1 point value in the former sample sequence.
3. the capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard according to claim 2 is characterized in that: in said step 2) in, the step of frequency-tracking is following:
21) reference voltage signal Ux is carried out the Fourier transform of complete cycle ripple;
22) the Fourier transform result is carried out Filtering Processing;
23) utilize the phase differential of the adjacent cycle of filtered first-harmonic vector calculation
24) using the phase difference calculate the frequency variation
25) calculate original signal frequency f=f s-Δ f;
26) according to the up-to-date frequency values that calculates, adjustment resamples at interval, returns step 21).
4. the capacitive apparatus medium loss on-line monitoring method based on the IEC61850-9-2 standard according to claim 1 is characterized in that: the amplitude of the reference voltage of synchronization and phase place obtain be through internal clock time service unit, station through 2 road optical fiber B sign indicating numbers to the time signal discontinuity surface when inserting merge cells and the realization of dielectric loss measurement unit respectively to reference voltage and Leakage Current information same information acquisition.
CN201210031017.4A 2012-02-10 2012-02-10 Capacitive equipment medium loss online monitoring method based on IEC61850-9-2 standard CN102565542B (en)

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CN103091563A (en) * 2013-01-15 2013-05-08 广西电网公司电力科学研究院 Calculation method of dielectric power factors of high-voltage electrical equipment
CN104215842A (en) * 2013-06-03 2014-12-17 国家电网公司 Sleeve based online transformer monitoring system
CN104215842B (en) * 2013-06-03 2016-09-28 国家电网公司 A kind of transformer online monitoring system based on sleeve pipe
CN103383412B (en) * 2013-07-10 2015-08-26 珠海许继芝电网自动化有限公司 A kind of method of self-adaptation software and hardware frequency-tracking sampling
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