CN104865452B - Not transposed transmission line electric capacity anti-jamming measurement methods based on harmonic component - Google Patents

Not transposed transmission line electric capacity anti-jamming measurement methods based on harmonic component Download PDF

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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
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胡志坚
熊敏
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武汉大学
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Abstract

The invention discloses a kind of not transposed transmission line electric capacity anti-jamming measurement methods based on harmonic component, sufficiently large triple-frequency harmonics is produced in measurement circuitry by saturation transformer, utilize the three-phase voltage and three-phase current of the synchronous measuring apparatus measurement circuitry head and end based on GPS technology, using adding the FFT interpolation algorithms of Hanning window to handle the voltage and current of circuit head and end, the three-phase voltage of head and end and the third-harmonic component of three-phase current are obtained.In view of not replacing, mutually parameter is unequal between circuit two-phase simultaneously, and the self-admittance of all phases and alternate transadmittance parameter are solved using harmonic component and based on transmission line of electricity lumped parameter model, so obtain orderly capacitance parameter.Influence of the neighbouring charging operation circuit Hz noise to measured line capacitance measurement is eliminated by patent of invention, measurement accuracy is drastically increased, the needs of Practical Project measurement can be met.

Description

Not transposed transmission line electric capacity anti-jamming measurement methods based on harmonic component

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 anti-jamming 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 above-mentioned 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 three-phase 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 power-frequency 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 phase-sequence electric capacity and different sequences.

The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals:

Not transposed transmission line electric capacity anti-jamming 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 three-phase line.Measuring process Including:

Step 1, by step-up transformer (transformer of the lower energy saturation of zero load), three-phase work is applied in measurement circuitry a head ends Frequency voltage, circuit a ends three-phase open circuit (end current 0).Utilize the synchronous measuring apparatus synchronous acquisition line based on GPS technology The three-phase voltage of road a head endsThe three-phase voltage of endWith the three-phase 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 three-phase voltageThe three-phase voltage of endWith the three-phase 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 three-phase voltageThe three-phase voltage of endWith the three-phase current of head end

Step 4, to the three-phase 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 three-phase current data, using adding FFT (Fast Fourier Transform (FFT)) interpolation algorithm of Hanning window to handle, obtain three groups of first and last The three-phase voltage at both ends and the third-harmonic component of three-phase current, including:

Under measuring for the first time, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase The third-harmonic component of voltageWith the third-harmonic component of head end three-phase current

Under second measures, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase The third-harmonic component of voltageWith the third-harmonic component of head end three-phase current

Under third time measures, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase The third-harmonic component of voltageWith the third-harmonic component of head end three-phase 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, Y3For admittance matrix of the circuit under third harmonic frequencies:

Ya3For the admittance being measured under circuit A phase third harmonic frequencies, Yb3To be measured circuit B phase third harmonic frequencies Under admittance, Yc3For the admittance being measured under circuit C phase third harmonic frequencies, Yab3、Yac3、Ybc3To be measured circuit difference two Transadmittance between phase under third harmonic frequencies.

Solve equation and try to achieve admittance matrix Y3

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 C0, positive sequence electric capacity C1, negative phase-sequence electric capacity C2And the mutual capacitance C between different two sequences01、C02、C10、C12、 C20、C21

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 anti-jamming measurement methods of harmonic component, by saturation transformer under zero load in circuit is measured Caused triple-frequency harmonics, utilize the three-phase voltage and three-phase 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 third-harmonic component of phase voltage and three-phase current.Simultaneously in view of mutually parameter is unequal between the circuit two-phase that do not replace, utilize Harmonic component solves the self-admittance 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 three-phase voltage and three-phase current data, can disposably measure orderly capacitance parameter;

(4) situation of neighbouring line-hit 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 super-pressure returns/double back bipolar transmission line road equivalent schematic with tower four.

Accompanying drawing 2 is the distributed parameter model schematic diagram of super-pressure transmission line with four-circuit on single tower.

Accompanying drawing 3 is super-pressure transmission line with four-circuit 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 step-up transformer (the lower energy saturation transformer of zero load), apply in measured circuit a head ends Three-phase main-frequency 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 three-phase voltage of circuit a head ends simultaneouslyEnd Three-phase voltageWith the three-phase 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 three-phase voltage of circuit a head ends simultaneouslyThe three-phase voltage of endWith the three-phase 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 three-phase voltage of circuit a head ends simultaneouslyThe three-phase voltage of endWith the three-phase 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 three-phase voltage of three groups of head and ends and the triple-frequency harmonics of three-phase current Component, including:

Under measuring for the first time, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase The third-harmonic component of voltageWith the third-harmonic component of head end three-phase current

Under second measures, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase The third-harmonic component of voltageWith the third-harmonic component of head end three-phase current

Under third time measures, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase The third-harmonic component of voltageWith the third-harmonic component of head end three-phase 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 triple-frequency 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 frequencies3

Wherein:

Step 6, by Y3Substitution formula (A3)

Solution obtains all capacitance parameters, including zero sequence electric capacity C0, positive sequence electric capacity C1, negative phase-sequence electric capacity C2And different two sequences Between mutual capacitance C01、C02、C10、C12、C20、C21.Capacitance parameter unit is nF/km.

To illustrate the invention for the sake of effect, by taking common-tower double-return 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 three-phase 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 three-phase 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 phase-sequence 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 phase-sequence 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 three-phase to replace so that three-phase 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)

1. a kind of not transposed transmission line electric capacity anti-jamming measurement methods based on harmonic component, define transmission line of electricity a to be measured, Normal operation and the transmission line of electricity b for bringing Hz noise, measuring process include:
Step 1, by step-up transformer, three-phase main-frequency voltage, circuit a terminal open circuits, end are applied in measured circuit a head ends Electric current is 0;Utilize the three-phase voltage of the synchronous measuring apparatus synchronous acquisition circuit a head ends based on GPS technology The three-phase voltage of endWith the three-phase current of head end
Step 2, A phases and the wiring position of B phases and circuit in head end three phase mains are exchanged, utilizes the same pacing based on GPS technology Measure the three-phase voltage of device synchronous acquisition circuit a head endsThe three-phase voltage of endWith The three-phase current of head end
Step 3, A phases and the wiring position of C phases and circuit in head end three phase mains are exchanged, utilizes the same pacing based on GPS technology Measure the three-phase voltage of device synchronous acquisition circuit a head endsThe three-phase voltage of end With the three-phase current of head end
Step 4, to the three-phase voltage of the three groups of head and ends obtained under three kinds of independent metering systems of step 1, step 2 and step 3 With three-phase current data, using adding the FFT interpolation algorithms of Hanning window to handle, the three-phase voltage and three-phase of three groups of head and ends are obtained The third-harmonic component of electric current, including:
Under measuring for the first time, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase voltage Third-harmonic componentWith the third-harmonic component of head end three-phase current
Under second measures, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase voltage Third-harmonic componentWith the third-harmonic component of head end three-phase current
Under third time measures, the third-harmonic component of circuit a head end three-phase voltagesEnd three-phase voltage Third-harmonic componentWith the third-harmonic component of head end three-phase current
Step 5, by the third harmonic voltage and triple harmonic current of three groups of circuit head and ends, and circuit model, obtain:
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Ya3For the admittance being measured under circuit A phase third harmonic frequencies, Yb3To be measured leading under circuit B phase third harmonic frequencies Receive, Yc3For the admittance being measured under circuit C phase third harmonic frequencies, Yab3、Yac3、Ybc3To be measured between circuit difference two-phase Transadmittance under third harmonic frequencies;
Solve equation and try to achieve admittance matrix Y3
Step 6, the phase admittance matrix under measured circuit third harmonic frequencies is converted to the sequence capacitance matrix under fundamental frequency, Simultaneously divided by line length l, obtain the capacitance parameter of every km;Including zero sequence electric capacity C0, positive sequence electric capacity C1, negative phase-sequence electric capacity C2, with And the mutual capacitance C between different two sequences01、C02、C10、C12、C20、C21
In above formula, l is line length, and w=2 π f, f are mains frequency.
2. the not transposed transmission line electric capacity anti-jamming measurement methods according to claim 1 based on harmonic component, feature It is:In the steps 1 and 2,3,4, by step-up transformer in measurement circuitry caused triple-frequency harmonics, using based on GPS skills The three-phase voltage and three-phase current of the synchronous measuring apparatus measurement circuitry head and end of art, calculated using the FFT interpolation of Hanning window is added Method is handled the voltage and current of circuit head and end, obtains the three-phase voltage of head and end and the triple-frequency harmonics point of three-phase current Amount, is calculated using harmonic component.
3. the not transposed transmission line electric capacity anti-jamming measurement methods according to claim 1 based on harmonic component, feature It is:In the step 5 and step 6, it is contemplated that mutual parameter is unequal between the circuit two-phase that do not replace, is solved using harmonic component Go out the self-admittance of all phases and alternate transadmittance, so obtain orderly capacitance parameter.
CN201510331077.1A 2015-06-15 2015-06-15 Not transposed transmission line electric capacity anti-jamming measurement methods based on harmonic component CN104865452B (en)

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