CN113866542B - Method for determining voltage interference cutoff boundary of large-area power grid to buried metal pipe network - Google Patents
Method for determining voltage interference cutoff boundary of large-area power grid to buried metal pipe network Download PDFInfo
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a method for determining a voltage interference cutoff boundary of a large-area power grid to a buried metal pipe network, which comprises the following steps: firstly, on the basis of the initial value of the continuous interference voltage component threshold, evaluating whether the truncation error under the initial value of the continuous interference voltage component threshold meets the requirement of calculation precision, if so, determining the initial value as a threshold, and if not, adjusting the size of the threshold until the requirement of calculation precision is met; then, determining how large-range power transmission lines on two sides of the pipeline possibly generate interference voltage components with the amplitude larger than a threshold value, and further cutting off a large-area power grid; and finally, determining the modeling boundary of the large-area power grid according to the cutoff boundary.
Description
Technical Field
The invention belongs to the technical field of power transmission and transformation engineering, and particularly relates to an influence analysis method of a large-area power grid on a buried metal pipe network.
Background
In studying the continuous disturbance of a large-area power grid to a pipeline, the disturbance voltage on the pipeline is determined by all power transmission projects in the power grid. If the continuous interference on the pipeline is to be accurately calculated, a transmission line in the whole power grid needs to be established. Because the coverage range of the power grid is extremely wide and the number of the power transmission lines is extremely large, it is not realistic to construct the whole power grid model in detail, and proper simplification is needed to ensure that the continuous interference calculation result meeting the precision requirement is obtained while the feasible number of power transmission projects is considered.
According to the analysis result of the interference level of the typical power transmission engineering on the pipeline, as the distance between the power transmission line and the pipeline increases, the continuous interference voltage on the pipeline is rapidly reduced, and when the distance between the power transmission line and the pipeline is large enough, the continuous interference voltage generated on the pipeline by the power transmission line is extremely small, and as the distance increases, the reduction speed of the continuous interference voltage is extremely slow.
The continuous interference voltage on the pipeline is the vector sum of continuous interference voltages generated by each power transmission line on the pipeline, and the total continuous interference voltage on the pipeline is mainly determined by the interference voltage components with larger amplitude due to the phase difference among interference voltage components caused by current carrying current phase difference, space relative position, lead phase sequence arrangement mode and the like, and meanwhile, the power transmission lines in the nearer range (several kilometers) on the two sides of the pipeline are considered to be generally fewer. The prior art has too many factors to consider in determining the cutoff boundary, affecting efficiency.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problem to be solved by the invention is to provide a method for determining the cutoff boundary of the voltage interference of a large-area power grid to a buried metal pipe network, wherein the influence of parallel length, current carrying current and the like on the continuous interference voltage component is not considered in the process of determining the cutoff boundary, only the influence of the distance is considered, and the interference voltage component with the amplitude smaller than a threshold value due to the distance is discarded, so that the cutoff boundary of the large-area power grid is determined.
In order to solve the technical problems, the invention adopts the following technical scheme: the method for determining the voltage interference cutoff boundary of the large-area power grid to the buried metal pipe network comprises the following steps:
firstly, on the basis of the initial value of the continuous interference voltage component threshold, evaluating whether the truncation error under the initial value of the continuous interference voltage component threshold meets the requirement of calculation precision, if so, determining the initial value as a threshold, and if not, adjusting the size of the threshold until the requirement of calculation precision is met;
then, determining how large-range power transmission lines on two sides of the pipeline possibly generate interference voltage components with the amplitude larger than a threshold value, and further cutting off a large-area power grid;
and finally, determining the modeling boundary of the large-area power grid according to the cutoff boundary.
Compared with the prior art, when the large-area power grid model is constructed, the range of the secondary components of the interference voltage generated by various typical power transmission lines is determined by utilizing the threshold value, so that the modeling boundary of the large-area power grid is determined, and the power transmission lines within the cut-off boundaries on the two sides of the large-area power grid are modeled during calculation and analysis.
The specific technical scheme adopted by the invention and the beneficial effects brought by the technical scheme are disclosed in the following detailed description in combination with the drawings.
Drawings
The invention is further described with reference to the drawings and detailed description which follow:
FIG. 1 is a schematic diagram of the superposition of persistent disturbance components on a pipe;
fig. 2 is a flow chart of a method for analyzing continuous interference of a large-area power grid to a buried metal pipeline.
Detailed Description
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
As shown in fig. 1, although the continuous disturbance voltage on the pipeline is determined by the continuous disturbance voltage component generated by the transmission lines used in the power grid, only a few transmission lines with smaller distance from the pipeline, longer parallel length and larger current carrying current will generate continuous disturbance voltage component with larger amplitude, namely main component, on the pipeline, while the transmission lines with larger distance from the pipeline will generate continuous disturbance voltage with smaller amplitude on the pipeline, namely secondary component of disturbance voltage with smaller amplitude, namely gamma 1 The rest continuous interference voltage component is marked as gamma 2 . Meanwhile, the phase of each interference voltage component has larger difference due to the differences of the current carrying phases, the spatial relative positions, the arrangement modes of phase conductors and the like of each transmission line. Because the number of the interference voltage secondary components generated by the transmission line far from the pipeline is extremely large, the phase of the part of the interference voltage secondary components can be assumed to be subject to uniform distribution, and the part of the interference voltage secondary components can be considered to be approximately zero after being overlapped according to the central limit theorem.
Therefore, after the continuous interference voltage component threshold value is determined, the range of the secondary component of the interference voltage generated by various typical power transmission lines can be determined according to the change rule of the interference voltage amplitude along with the distance between the power transmission lines and the pipelines, and further the modeling boundary of the whole large-area power grid is determined, so that modeling of the large-area power grid on electromagnetic interference analysis of the buried metal pipe network is realized.
As shown in fig. 2, the method for determining the continuous voltage interference cutoff boundary of the large-area power grid to the buried metal pipe network includes that firstly, whether cutoff errors under the initial value of the continuous interference voltage component meet the requirement of calculation accuracy is evaluated on the basis that the initial value of the continuous interference voltage component is determined, if yes, the initial value is determined to be a threshold, and if not, the size of the threshold is adjusted until the requirement of calculation accuracy is met; then, determining how large-range power transmission lines on two sides of the pipeline possibly generate interference voltage components with the amplitude larger than a threshold value, wherein the boundary of the range is the boundary of the continuous voltage interference cutoff boundary of the power grid to the pipeline, and cutting off the power grid in a large area can be realized outside the boundary; the calculation method in which the transmission line may generate amplitude values on both sides of the pipeline may refer to the prior art.
And finally, when a large-area power grid model is constructed, the range of the secondary components of the interference voltage generated by various typical power transmission lines can be determined by utilizing the threshold value, so that the modeling boundary of the large-area power grid is determined, and the power transmission lines within the cut-off boundaries at the two sides of the pipeline can be modeled during calculation and analysis.
According to the embodiment of the invention, errors caused by the truncated boundary are constructed and estimated by utilizing knowledge of mathematical statistics, and a reasonable threshold value is further provided.
Regarding the interference voltage of the transmission line on the pipeline, the amplitude U and the phase theta of the interference voltage are regarded as two independent random variables. Because of the difference of the relative positions of the transmission lines and the pipeline space and the current phase, the phase of the interference voltage component generated by each line is greatly different, and the interference voltage component is approximately considered to be subjected to uniform distribution, namely theta-U < -pi, pi >, and the probability density function is as follows:
the interference voltage amplitude U is a function of the distance d between the transmission line and the pipeline, namely:
U＝f(d) (2.4-2)
when the distance d is larger and the interference voltage amplitude U is smaller, U will drop monotonically with d, so a reversible function exists, and the following equation is established.
d＝f -1 (U)＝g(U) (2.4-3)
The differential of the above results in a rate of change of the spacing versus the disturbance voltage on the pipe.
If the transmission lines are uniformly distributed, the number of the transmission lines in a certain interval range at two sides of the pipeline is in direct proportion to the interval delta d, so that the probability distribution of the interference voltage amplitude in [ epsilon, M ] can be considered as follows:
wherein A is a constant,m is a threshold value and epsilon is an arbitrarily small positive number.
Representing the disturbance voltage vector as a random variable X, then:
X＝a+jb＝Ucos(θ)+jUsin(θ) (2.4-6)
then, there are:
will be f 1 The ith disturbance voltage minor component of (1) is denoted as X i F is then 1 The vector sum Z of all minor components in (a) can be expressed as:
in the above, n is the number of F 1 Medium disturbance voltage secondaryNumber of transmission lines of component, if the average number of transmission lines per unit pitch is assumed to be ρ, n= 2[g (ε) -g (M)]ρ。
According to the central limit theorem, it is known that:
thus, in analyzing the continuous interference of a large-area power grid to a buried metal pipeline, it can be approximated as f 1 The vector sum of the numerous disturbance voltage secondary components is zero, and only R is considered 2 A power transmission line corresponding to a few disturbance voltage components.
In the formula (2.4-11), h (x) is an arbitrary function.
I.e. f 1 The probability density function of the secondary component vector and the modulus of the medium interference voltage satisfies the Rayleigh distribution. When the threshold is selected, the probability that the ignored minor component causes different errors when the threshold is used can be analyzed by using the formulas (2.4-12), so that whether the threshold meets the requirement of calculation accuracy is evaluated.
Therefore, according to the change rule of the continuous interference voltage amplitude along with the distance between the line and the pipeline, a probability model for evaluating the cut-off error can be constructed, and then a threshold value meeting the requirement of calculation accuracy can be obtained. Combining the change rule of the threshold value and the continuous interference voltage amplitude along with the distance between the line and the pipeline, the method can determine how large a power transmission line on two sides of the pipeline possibly generates an interference voltage component with the amplitude larger than the threshold value, namely: obtaining and generating gamma 1 The range of the transmission line of the medium interference voltage component is further cut off of a large-area power grid.
In order to obtain a suitable threshold, a 220kV power grid is taken as an example, and the functional relation between the interference voltage amplitude U and the distance d between the transmission line and the pipeline is analyzed. As the distance between the line and the pipeline increases, the amplitude of the continuous interference voltage will decrease rapidly, and in order to quantitatively study the change rule, the functional relationship f (d) between the continuous interference voltage and the distance is described in a power function form, as shown in the formula (2.4-13), and then table 1 can be obtained through fitting.
U＝f(d)＝C 1 d -m ,m＞0 (2.4-13)
Wherein U is the amplitude of continuous interference voltage on the pipeline, and V; d is the distance between the transmission line and the pipeline, km; c and m are parameters of the formula (I),
TABLE 1 fitting of the results of the functional relationship f (d) between the sustained interference voltage and the spacing
From the fitting results in table 1, it can be seen that, for conservation, m in the formula (2.4-13) can be taken as the lower limit value of 2.0 for all fitting results, and then in the formula (2.4-12):
thus f 2 The probability density function of the disturbance voltage secondary component vector and the modulus value is as follows:
when the amplitude of the disturbance voltage is smaller than 0.4V, the speed of the continuous disturbance voltage amplitude decreasing along with the increase of the distance between the pipelines becomes very slow, and therefore 0.4V is selected as the initial value of the threshold value M. Dividing the continuous disturbance voltage on the pipeline into disturbance voltage minor component gamma generated by the transmission line far from the pipeline by using threshold value 1 And other component f 2 F is then 1 The probability density function of the secondary component vector and the modulus of the medium interference voltage is expressed as (2.4-15).
The continuous interference voltage generated by the power grid on the pipeline mainly causes problems of accelerating pipeline corrosion and threatening personal safety of personnel contacted with the pipeline, so that limit requirements are made on the problems in related regulations. Because the buried pipeline is buried deeply in the ground, common personnel are difficult to contact with the buried pipeline, and 60V for professionals is often used as a personal safety limit according to GB 6830; the corrosion aspect of the pipe is often limited in terms of leakage current density according to GB/T50698. Because the leakage current density is related to the continuous interference voltage on the pipeline and the soil resistivity near the pipeline, the pipeline span is large, and the soil resistivity change range is wide, only the personal safety limit value of 60V is considered when the calculation accuracy requirement is considered. When the threshold value is 0.4V, if 5 transmission lines are arranged in the vicinity of the pipeline in every kilometer on average, namely the distance between adjacent transmission lines is 200m, then f 1 The probability of 95% of the secondary component vector and the modulus of the medium interference voltage is less than 2.23V, and the fewer the average transmission lines per kilometer are near the pipeline, the smaller the gamma 1 The smaller the disturbance voltage secondary component vector and the modulus. Therefore, when the average number of the power transmission lines per kilometer near the pipeline is smaller than 5, the probability of 95% of the cut-off errors is smaller than 3.72% of the limit value, and therefore the threshold value can be considered to be 0.4V, and the requirement on calculation accuracy in general engineering can be met.
While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (2)
1. The method for determining the voltage interference cutoff boundary of the large-area power grid to the buried metal pipe network is characterized in that,
firstly, on the basis of the initial value of the continuous interference voltage component threshold, evaluating whether the truncation error under the initial value of the continuous interference voltage component threshold meets the requirement of calculation precision, if so, determining the initial value as a threshold, and if not, adjusting the size of the threshold until the requirement of calculation precision is met;
then, determining how large-range power transmission lines on two sides of the pipeline possibly generate interference voltage components with the amplitude larger than a threshold value, and further realizing the interception of a large-area power grid, wherein the boundary of the range is the boundary of the continuous voltage interference interception boundary of the power grid to the pipeline;
and finally, determining the modeling boundary of the large-area power grid according to the cutoff boundary.
2. The method for determining the voltage interference cutoff boundary of the large-area power grid to the buried metal pipe network according to claim 1, wherein the method comprises the following steps of: regarding the interference voltage of the transmission lines on the pipeline, the amplitude U and the phase theta of the transmission lines are regarded as two independent random variables, and because of the difference of the spatial relative positions of the transmission lines and the pipeline and the phase difference of current carrying currents, the phase difference of interference voltage components generated by the transmission lines is caused to have larger difference, so that the transmission lines are approximately considered to be subject to uniform distribution, namely theta-U < -pi >, and then the probability density function is as follows:
the interference voltage amplitude U is a function of the distance d between the transmission line and the pipeline, namely:
u=f (d) (2.4-2) when the spacing d is large, the disturbance voltage amplitude U is small, U will decrease monotonically with d, so there is a reversible function, making the following equation true,
d＝f -1 (U)＝g(U)(2.4-3)
taking the differential of the above can obtain the rate of change of the distance to the disturbance voltage on the pipeline,
if the transmission lines are uniformly distributed, the number of the transmission lines in a certain interval range at two sides of the pipeline is in direct proportion to the interval delta d, so that the probability distribution of the interference voltage amplitude in [ epsilon, M ] can be considered as follows:
wherein A is a constant,m is a threshold; epsilon is any small positive number;
representing the disturbance voltage vector as a random variable X, then:
X＝a+jb＝Ucos(θ)+jUsin(θ) (2.4-6)
then, there are:
Г 1 for the secondary component of the interference voltage generated by the transmission line far from the pipeline, the gamma is calculated 1 The ith disturbance voltage minor component of (1) is denoted as X i F is then 1 The vector sum Z of all minor components in (a) can be expressed as:
in the above, n is the number of F 1 Number of transmission lines of secondary component of medium-disturbance voltage, if the average number of transmission lines per unit pitch is assumed to be ρ, n= 2[g (ε) -g (M)]ρ；
In the formula (2.4-11), h (x) is an arbitrary function;
i.e. f 1 The probability density function of the secondary component vector and the modulus of the medium interference voltage meets Rayleigh distribution, after a threshold value is selected, when the threshold value is analyzed by using the formula (2.4-12), the probability of different errors caused by the ignored secondary component is evaluated, and whether the threshold value meets the requirement of calculation precision is further evaluated.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013167310A1 (en) * | 2012-05-08 | 2013-11-14 | Siemens Aktiengesellschaft | Module unit, compound and method for monitoring a power supply network |
| CN109670199A (en) * | 2018-11-08 | 2019-04-23 | 珠海许继芝电网自动化有限公司 | A kind of efficient power network topology analysis method and device |
| CN111983386A (en) * | 2020-08-19 | 2020-11-24 | 剑科云智(深圳)科技有限公司 | Distributed state estimation system of power distribution network |
| CN112800625A (en) * | 2021-02-08 | 2021-05-14 | 国电南瑞科技股份有限公司 | Method and system for determining full-clean power supply operation boundary of regional power grid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8723269B2 (en) * | 2011-12-27 | 2014-05-13 | Leonard Richard Rockett | Buried power grid designs for improved radiation hardness in CMOS technologies |
| US10074983B2 (en) * | 2016-08-24 | 2018-09-11 | General Electric Technology Gmbh | Primary power grid frequency response characterization using phasor measurement unit data |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013167310A1 (en) * | 2012-05-08 | 2013-11-14 | Siemens Aktiengesellschaft | Module unit, compound and method for monitoring a power supply network |
| CN109670199A (en) * | 2018-11-08 | 2019-04-23 | 珠海许继芝电网自动化有限公司 | A kind of efficient power network topology analysis method and device |
| CN111983386A (en) * | 2020-08-19 | 2020-11-24 | 剑科云智(深圳)科技有限公司 | Distributed state estimation system of power distribution network |
| CN112800625A (en) * | 2021-02-08 | 2021-05-14 | 国电南瑞科技股份有限公司 | Method and system for determining full-clean power supply operation boundary of regional power grid |
Non-Patent Citations (2)
| Title |
|---|
| 800kV特高压直流入地电流对埋地钢管道的影响;张良 等;《天然气工业》;第39卷(第12期);134-138 * |
| Model Identification and Equivalence Method for Grid Optimal Operation;Shuang Liang 等;《Journal of Physics: Conference Series》;第1650卷;1-9 * |
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