CN109299564A - The modification method that temperature factor influences in transformer bias current simulations calculating process - Google Patents
The modification method that temperature factor influences in transformer bias current simulations calculating process Download PDFInfo
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- CN109299564A CN109299564A CN201811222165.8A CN201811222165A CN109299564A CN 109299564 A CN109299564 A CN 109299564A CN 201811222165 A CN201811222165 A CN 201811222165A CN 109299564 A CN109299564 A CN 109299564A
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Abstract
The present invention relates to the modification methods that temperature factor in a kind of transformer bias current simulations calculating process influences, it include: to build simulation model, according to substation ground network, main transformer, the conductor radius of earthing pole, number of segment mesh, types of conductors and the types of coatings parameter collected early period, modeling assignment is carried out；By program self-test simulation model whether zero defect, enter if zero defect in next step, otherwise, by re-establish earth mat, main transformer, earthing pole parameter carry out Modifying model；Bias current simulation calculation is carried out, whether compares between calculated value and measured value error less than 5%；If the error range for meeting 5%, completes to calculate, otherwise corrects temperature coefficient, recalculate.Through the invention, the error between the calculated value and actual value of DC magnetic bias current is obviously reduced；By the bias current at a temperature of varying environment, it is normalized on the basis of electric current when by 20 DEG C, is corrected by temperature coefficient, can be convenient engineering calculation.
Description
Technical field
The present invention relates to D.C. high voltage transmission computing technique field, especially a kind of transformer bias current simulations were calculated
The modification method that temperature factor influences in journey.
Background technique
Under high pressure and extra-high voltage direct-current transmission normal operating condition, DC line works in the bipolar method of operation, direct current
Stream constitutes circuit by the power transmission line at the two poles of the earth, but in system debug, in the case where overhauling or break down, D.C. high voltage transmission meeting
Using the method for operation of monopole ground return circuit.Earth current field, which flows through range environment to electric current, when monopole ground return circuit is run to make
At large effect, since huge DC current flows into the earth through direct current grounding pole, thus can cause in large range of
Ground potential variation, the variation of this ground potential may cause influence for the AC system in impacted area.Particularly with neutrality
The AC system of point ground connection, it will the substation in different DC potentials is made to constitute direct current through transmission line of electricity, transformer winding
Circuit, DC current can invade transformer winding through transformer neutral point, cause the D.C. magnetic biasing of transformer.Transformer occurs straight
Phenomena such as will appear noise increase after stream bias, vibrating aggravation, it is also possible to overheat, and cause the harmonic distortion of AC network
Increase.
When running for direct current system monopole the earth, the phenomenon that ground potential increases, causes transformer noise increase to threaten safety
The event of operation is appeared in the newspapers repeatly in China's electric system and is led.For this phenomenon, associated mechanisms of domestic each electric power research and big
Special universities and colleges all put into a large amount of manpower and are studied, and research conditions concentrate on two main aspects, one side researching DC system
Surface potential when monopole the earth of uniting is run, the distribution situation of electric current；Another aspect researching DC is to the coils class equipment such as transformer
Influence and suppressing method.It can be found that less in view of environment temperature is to the shadow of DC magnetic bias current in existing research
It rings.China's weather conditions are complicated, and the climate difference in various regions section is larger, it is therefore necessary to which research environment temperature is to power transformation in power grid
It stands the influence of DC magnetic bias current, in order to reasonably be assessed calculated result.
Summary of the invention
A kind of influence the purpose of the present invention is to provide consideration different regions environment temperature to DC magnetic bias current, guarantees
The accuracy that DC magnetic bias current calculates, the change that the error between the calculated value of DC magnetic bias current and actual value is obviously reduced
The modification method that temperature factor influences during depressor bias current simulation calculation.
To achieve the above object, the invention adopts the following technical scheme: a kind of transformer bias current simulations calculated
The modification method that temperature factor influences in journey, this method include the steps that following order:
(1) simulation model is built, according to substation ground network, main transformer, the conductor radius of earthing pole, section collected early period
Number, types of conductors and types of coatings parameter, carry out modeling assignment；
(2) by program self-test simulation model whether zero defect, enter if zero defect in next step, otherwise, by again
It establishes earth mat, main transformer, earthing pole parameter and carries out Modifying model；
(3) bias current simulation calculation is carried out, whether compares between calculated value and measured value error less than 5%；
(4) it if meeting 5% error range, completes to calculate, otherwise corrects temperature coefficient, recalculate.
In the step (1), the generation of grounded screen is to input soil resistivity and ground resistance by GSE software, comes
Obtain the area of the high density grounded screen at each station；Main transformer modeling, is successively to be drawn in 7 main transformers in earth mat in SESCAD software
Between, while high pressure three-phase windings are drawn, and winding is connected with neutral point of main transformer；Earthing pole modeling, it is original using earthing pole
Design parameter is drawn in SESCAD.
In the step (2), after having built simulation model, using SESCAD program self-test, check whether model is deposited
In short section, conductor overlapping, flaoating nodes, network interstitial defect.
In the step (3), after the self-test for completing simulation model, DC magnetic bias current is carried out using MALZ software
It calculates, and calculated value is compared with measured value, see its error whether in 5% range.
In the step (4), when error is more than 5% range, by the temperature adjustmemt for modifying different resistivity area
Coefficient carrys out the accuracy of correction model；If meeting 5% error, assert that the calculating is accurate.
As shown from the above technical solution, the present invention has the advantages that first, the calculated value and actual value of DC magnetic bias current
Between error be obviously reduced；Second, the bias current at a temperature of varying environment is returned on the basis of electric current when by 20 DEG C
One change processing, is corrected by temperature coefficient, can be convenient engineering calculation.
Detailed description of the invention
Fig. 1 is flow chart of the method for the present invention；
Analysis Fig. 2 of the invention rack schematic diagram；
Fig. 3 is influence schematic diagram of the low-resistance region temperature to DC magnetic bias current；
Influence schematic diagram of the area the Tu4Wei Zhongzu temperature to DC magnetic bias current；
Fig. 5 is influence schematic diagram of the high resistance area temperature to DC magnetic bias current.
Specific embodiment
As shown in Figure 1, the modification method that temperature factor influences in a kind of transformer bias current simulations calculating process, the party
Method includes the steps that following order:
(1) simulation model is built, according to substation ground network, main transformer, the conductor radius of earthing pole, section collected early period
Number, types of conductors and types of coatings parameter, carry out modeling assignment；
(2) by program self-test simulation model whether zero defect, enter if zero defect in next step, otherwise, by again
It establishes earth mat, main transformer, earthing pole parameter and carries out Modifying model；
(3) bias current simulation calculation is carried out, whether compares between calculated value and measured value error less than 5%；
(4) it if meeting 5% error range, completes to calculate, otherwise corrects temperature coefficient, recalculate.
In the step (1), the generation of grounded screen is to input soil resistivity and ground resistance by GSE software, comes
Obtain the area of the high density grounded screen at each station；Main transformer modeling, is successively to be drawn in 7 main transformers in earth mat in SESCAD software
Between, while high pressure three-phase windings are drawn, and winding is connected with neutral point of main transformer；Earthing pole modeling, it is original using earthing pole
Design parameter is drawn in SESCAD.
In the step (2), after having built simulation model, using SESCAD program self-test, check whether model is deposited
In short section, conductor overlapping, flaoating nodes, network interstitial defect.
In the step (3), after the self-test for completing simulation model, DC magnetic bias current is carried out using MALZ software
It calculates, and calculated value is compared with measured value, see its error whether in 5% range.
In the step (4), when error is more than 5% range, by the temperature adjustmemt for modifying different resistivity area
Coefficient carrys out the accuracy of correction model；If meeting 5% error, assert that the calculating is accurate.
Below in conjunction with Fig. 1,2,3,4,5, the present invention is further illustrated.
Theoretical rack in Fig. 2 is made of 9 substations, respectively S1-S9, each geographical location spacing of standing is 30km, between standing
It is connected with interconnection, the distribution of whole transformer station is the square of 60km in side length, and g is direct current grounding pole in figure, is located at away from S8
It stands at the 30km of horizontal position.The geographic range of the model is consistent to related regulation；With the electric resistance of soil of thermostat layer at 20 DEG C
On the basis of rate, the geographic area in research range is divided into high resistance area, the area Zhong Zu and low-resistance region.Wherein, thin solum resistance
Rate is that 60 regions below Ω m are known as low-resistance area；Thin solum resistivity is that the region of 60 Ω of Ω m~300 m is known as
Middle resistance area；Region of the thin solum resistivity more than 300 Ω m is known as high resistant area.China's weather conditions are considered, imitative
Five kinds of environment temperatures of setting are respectively as follows: 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C in very, calculate separately different at a temperature of obtaining five kinds
The bias current size in resistivity area, and data are normalized on the basis of electric current when by 20 DEG C, that respectively stands is inclined
Magnetoelectricity stream temperature characteristics is as shown in Fig. 3,4,5.By Fig. 3,4,5 it is found that temperature is influential on bias current；It is correcting
When can be on the basis of actual ambient temperature, bias current calculated value when to 20 DEG C is modified, and sticks on it more with actual value
Closely.Each station is ordered as S according to temperature effect according to Fig. 3,4,59>S7≈S5>S8>S6>S1≈S3>S2≈S4.It can see
S out8The temperature characterisitic stood is in middle position, and the stop spacing earthing pole distance is influenced most by bias current recently in rack
Greatly, therefore according to S in Fig. 4,58The temperature characteristics stood chooses corresponding correction factor, most confidence level and most intentionally
Justice.The curve discrete degree respectively stood in the area Zhong Zu and high resistance area is lower, by the area above-mentioned modification method Zhong Zu error be ±
4%, high resistance area is ± 2%, and the dispersion degree of low-resistance region is higher, will cause large error, therefore the change to low-resistance region is in
Power station suggests classifying by a distance from earthing pole, and the correction factor within the scope of different temperatures is proposed to each station.
The present invention considers influence of the different regions environment temperature to DC magnetic bias current, ensure that DC magnetic bias current
The accuracy of calculating, it is proposed that for the temperature correction in different soils resistivity area.With the field survey of bias current
Data verify the modification method in the present invention, the results showed that after temperature correction proposed by the present invention, directly
The error flowed between the calculated value and actual value of bias current is obviously reduced.
Claims (5)
1. the modification method that temperature factor influences in a kind of transformer bias current simulations calculating process, it is characterised in that: the party
Method includes the steps that following order:
(1) simulation model is built, according to substation ground network, main transformer, the conductor radius of earthing pole, number of segment collected early period
Mesh, types of conductors and types of coatings parameter, carry out modeling assignment；
(2) by program self-test simulation model whether zero defect, enter if zero defect in next step, otherwise, by re-establishing
Earth mat, main transformer, earthing pole parameter carry out Modifying model；
(3) bias current simulation calculation is carried out, whether compares between calculated value and measured value error less than 5%；
(4) it if meeting 5% error range, completes to calculate, otherwise corrects temperature coefficient, recalculate.
2. the modification method that temperature factor influences in transformer bias current simulations calculating process according to claim 1,
It is characterized by: in the step (1), the generation of grounded screen is to input soil resistivity and ground connection electricity by GSE software
Resistance, come obtain each station high density grounded screen area；Main transformer modeling, is successively to be drawn in 7 main transformers in SESCAD software
Among earth mat, while high pressure three-phase windings are drawn, and winding is connected with neutral point of main transformer；Earthing pole modeling, utilizes ground connection
Pole original design parameter, draws in SESCAD.
3. the modification method that temperature factor influences in transformer bias current simulations calculating process according to claim 1,
It is characterized by: after having built simulation model, using SESCAD program self-test, whether checking model in the step (2)
There are short section, conductor overlapping, flaoating nodes, network interstitial defect.
4. the modification method that temperature factor influences in transformer bias current simulations calculating process according to claim 1,
It is characterized by: after the self-test for completing simulation model, carrying out D.C. magnetic biasing electricity using MALZ software in the step (3)
The calculating of stream, and calculated value is compared with measured value, see its error whether in 5% range.
5. the modification method that temperature factor influences in transformer bias current simulations calculating process according to claim 1,
It is characterized by: when error is more than 5% range, the temperature by modifying different resistivity area is repaired in the step (4)
Positive coefficient carrys out the accuracy of correction model；If meeting 5% error, assert that the calculating is accurate.
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| CN114184876A (en) * | 2022-02-16 | 2022-03-15 | 国网江西省电力有限公司电力科学研究院 | DC magnetic bias monitoring, evaluation and earth model correction platform |
| CN117113733A (en) * | 2023-10-24 | 2023-11-24 | 国家电网有限公司西北分部 | Method and device for acquiring bias current of direct current near zone of power grid |
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| CN117113733A (en) * | 2023-10-24 | 2023-11-24 | 国家电网有限公司西北分部 | Method and device for acquiring bias current of direct current near zone of power grid |
| CN117113733B (en) * | 2023-10-24 | 2024-02-02 | 国家电网有限公司西北分部 | Method and device for acquiring bias current of direct current near zone of power grid |
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