A method and apparatus for determining operating parameters of an ac transmission line

Abstract

The embodiment of the application discloses a kind of methods and devices for determining the operating parameters of alternating current transmission line, and storage medium and electronic equipment, the method comprises: measuring the height of lower phase conductor to ground, power frequency electric field E1 and magnetic field intensity B1, according to the height of lower phase conductor to ground and the initial height of each phase conductor to ground H m0 Determine the actual height of each phase conductor to ground H m1 , according to H m1 , the phase-to-phase distance L m0 of each phase conductor and the conductor structure parameter Coefficient matrix λ1 and coefficient matrix P1 are calculated, and finally according to power frequency electric field E1, coefficient matrix λ1 and voltage correction coefficient k u , and magnetic field intensity B1, coefficient matrix P1 and current correction coefficient k i Operating voltage U1 and current I1 of alternating current transmission circuit are calculated respectively.The achievement of the application can be applied to environmental protection acceptance, long-term test and line optimization design research in the field of alternating current transmission engineering electromagnetism environment, and has high popularization value and wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic environment of power systems, and in particular to a method and apparatus for determining operating parameters of AC transmission lines, as well as a storage medium and electronic equipment. Background Technology

[0002] Currently, in order to obtain the electromagnetic environment characteristics of transmission lines, multiple long-term electromagnetic environment observation stations are generally established on ultra-high voltage AC and DC transmission lines to conduct long-term tests lasting one year or even several years. The electromagnetic environment of the line is not only affected by the climate, but also changes with the operating parameters such as line voltage, current and line height. In the past, long-term tests were limited by technical level and equipment conditions, and could only be conducted by querying the line operating conditions from substations or dispatching stations. The operating condition data provided by the power grid was often at intervals of more than one hour, while the electromagnetic environment parameters of long-term tests were usually at intervals of one minute or even less, and the two could not be matched one by one. Since long-term measurement points are often located in the middle of the line, not at the end of the line, and AC transmission lines are hundreds or even thousands of kilometers long, the line voltage varies greatly. The line voltage provided by the power grid can only represent the voltage near the outgoing line. At the same time, due to the influence of the line's impedance to ground, the line current is not completely consistent with that at the substation outgoing line.

[0003] Furthermore, in the past, line parameters at long-term test points were determined by only a few occasional tests, and the height and distance of the line were determined accordingly. The horizontal distance between the conductors of each phase of the line changed very little after the line was built, while the height of the line above the ground varied with the conductor sag. During long-term operation, due to significant seasonal temperature changes such as winter and summer, and the varying transmission capacity of the line from full load to light load or even no load, the conductor sag changed considerably, leading to changes in the line height. Changes in line voltage, current, and height all significantly affect the electromagnetic environment level. In order to accurately obtain the electromagnetic environment level and variation patterns of AC transmission lines under long-term testing, it is urgent to obtain the actual operating parameters of the line at long-term observation stations. Summary of the Invention

[0004] To address the technical problems in existing technologies for determining the operating parameters of AC transmission lines using long-term electromagnetic environment monitoring stations, which suffer from large errors in line voltage and current data and inaccurate data due to the lack of consideration for the line's height above ground, this invention is proposed. Embodiments of this invention provide a method and apparatus for determining the operating parameters of AC transmission lines, as well as a storage medium and electronic equipment.

[0005] According to one aspect of the present invention, a method for determining operating parameters of an AC transmission line is provided, for determining the operating voltage and operating current of the AC transmission circuit at an electromagnetic environment observation point of the transmission line, and the actual ground height of each phase conductor of the AC transmission line, the method comprising:

[0006] The height of the lower phase conductor to the ground, the power frequency electric field E1, and the magnetic field strength B1 are measured at the set position of the side phase conductor of the AC transmission line electromagnetic environment observation point.

[0007] The power frequency electric field E1 and magnetic field strength B1, as well as the height of the lower phase conductor above the ground, are collected synchronously.

[0008] Based on the lower phase conductor's height above ground and the pre-measured initial height H of each phase conductor above ground... m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 ;

[0009] Based on the actual ground height H of each phase conductor of the AC transmission line m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters is based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the pre-measured phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1;

[0010] Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit.

[0011] Optionally, in the above-described method embodiments of the present invention, before measuring the height of the lower phase conductor relative to ground at a set position of the AC transmission line side phase conductor at the electromagnetic environment observation point of the transmission line, the method further includes:

[0012] Collect the initial height H of each phase conductor of the AC transmission line to ground. m0 and the distance between phases L m0 .

[0013] Optionally, in the above-described method embodiments of the present invention, the initial ground height H of each phase conductor of the AC transmission line is collected. m0 and the distance between phases L m0 Previously, it also included determining the voltage correction factor and the current correction factor.

[0014] Optionally, in the above-described method embodiments of the present invention, determining the voltage correction coefficient and the current correction coefficient includes:

[0015] Select the central area of ​​the end span of the AC transmission line, and measure the power frequency electric field E0 and magnetic field strength B0 below the transmission line, as well as the height H of each phase conductor of the transmission line above the ground. a and the distance between phases La ;

[0016] The line voltage U0 and line current I0 were collected during the test period;

[0017] According to the height H of each phase conductor of the AC transmission line above the ground a and the distance between phases L a And the conductor structure parameter calculation coefficient matrix λ0, based on the ground height H of each phase conductor of the AC transmission line. a and the distance between phases L a And the coefficient matrix P0 for calculating the structural parameters of the conductor;

[0018] Calculate the voltage correction coefficient k based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u And calculate the current correction coefficient k based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i .

[0019] Optionally, in the above-described method embodiments of the present invention, the voltage correction coefficient k is calculated based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u And calculate the current correction coefficient k based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i include:

[0020] Calculate the voltage correction coefficient k based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u The calculation formula is as follows:

[0021] k u =E0 / (λ0*U0)

[0022] The current correction coefficient k is calculated based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows:

[0023] k i =B0 / (P0*I0).

[0024] Optionally, in the above-described method embodiments of the present invention, the method is based on the lower phase conductor's height above ground and a predetermined initial height H of each phase conductor above ground. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 include:

[0025] Calculate the difference C between the lower phase conductor's height above ground and its initial height above ground;

[0026] The actual height of the conductors other than the lower phase conductor in the AC transmission line to the ground is obtained by summing the initial height of the conductors to the ground with the difference C.

[0027] Optionally, in the above-described method embodiments of the present invention, the coefficient matrix λ1 and voltage correction coefficient k are determined based on the power frequency electric field E1. u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i The calculation of the operating current I1 of an AC transmission circuit includes:

[0028] Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u The formula for calculating the operating voltage U1 of an AC transmission circuit is as follows:

[0029] U1=k u *λ1*E1

[0030] The current correction coefficient k is calculated based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows:

[0031] I1=k i *P1*B1.

[0032] According to another aspect of the present invention, an apparatus for determining operating parameters of an AC transmission line is provided, for determining the operating voltage and operating current of the AC transmission circuit at an electromagnetic environment observation point of the transmission line, and the actual ground clearance of each phase conductor of the AC transmission line, the apparatus comprising:

[0033] The data measurement unit is used to measure the height of the lower phase conductor above the ground, the power frequency electric field E1, and the magnetic field strength B1 at a set position of the side phase conductor of the AC transmission line electromagnetic environment observation point.

[0034] The data processing unit is used to determine the initial ground height H of each phase conductor based on the lower phase conductor's height above ground and the pre-measured initial ground height H. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 According to the actual height H of each phase conductor of the AC transmission line to the ground m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters; based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the pre-measured phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; based on the power frequency electric field E1, the coefficient matrix λ1 and the voltage correction coefficient ku Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit.

[0035] Optionally, in the above-described embodiments of the apparatus of the present invention, the apparatus further includes a parameter setting unit for setting the initial ground height H of each phase conductor of the AC transmission line. m0 and the distance between phases L m0 ; and voltage correction factor k u and current correction factor k i .

[0036] Optionally, in the above-described apparatus embodiments of the present invention, the data measurement unit includes:

[0037] The first measurement module is used to measure the power frequency electric field E1 and magnetic field strength B1 directly below the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line.

[0038] The second measurement module is used to measure the height of the lower phase conductor above the ground directly below the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line. It includes two ranging units and one reference unit. The reference unit is used to calibrate the height reference value, one ranging unit is used to measure the height reference value calibrated by the reference unit, and the other ranging unit is located directly below the side phase conductor of the AC transmission line to measure the height of the lower phase conductor above the ground.

[0039] Optionally, in the above-described device embodiments of the present invention, the ranging unit is a laser rangefinder, and the reference unit is a scale with constant height.

[0040] Optionally, in the above-described embodiments of the apparatus of the present invention, the first measurement module is an all-weather power frequency field strength meter.

[0041] Optionally, in the above-described device embodiments of the present invention, the data processing unit determines the initial ground height H of each phase conductor based on the lower phase conductor's height above ground and the predetermined initial ground height H of each phase conductor. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 According to the actual height H of each phase conductor of the AC transmission line to the ground m1 and the predetermined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters; based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the predetermined phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; based on the power frequency electric field E1, the coefficient matrix λ1 and the voltage correction coefficient k uCalculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit, where:

[0042] Based on the lower phase conductor's height above ground and the predetermined initial height H of each phase conductor above ground. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 include:

[0043] Calculate the difference C between the lower phase conductor's height above ground and its initial height above ground;

[0044] The actual height of the conductors other than the lower phase conductor in the AC transmission line to the ground is obtained by summing the initial height of the conductors to the ground with the difference C.

[0045] Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u The formula for calculating the operating voltage U1 of an AC transmission circuit is as follows:

[0046] U1=k u *λ1*E1

[0047] The current correction coefficient k is calculated based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows:

[0048] I1=k i *P1*B1.

[0049] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the method for determining operating parameters of an AC transmission line as described in any of the above embodiments of the present invention.

[0050] According to another aspect of the present invention, an electronic device is provided, characterized in that the electronic device comprises:

[0051] processor;

[0052] Memory used to store the processor's executable instructions;

[0053] The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method for determining the operating parameters of an AC transmission line as described in any of the above embodiments of the present invention.

[0054] Based on the method and apparatus for determining the operating parameters of AC transmission lines, as well as the storage medium and electronic equipment provided in the above embodiments of the present invention, the lower phase conductor's height above ground, power frequency electric field E1, and magnetic field strength B1 are measured at a set position of the AC transmission line side phase conductor at the electromagnetic environment observation point of the transmission line. Based on the lower phase conductor's height above ground and the pre-measured initial heights H of each phase conductor above ground... m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 Based on the actual height H of each phase conductor of the AC transmission line to the ground m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 and coefficient matrix P1 are calculated based on the conductor structure parameters. Finally, based on the power frequency electric field E1, the coefficient matrix λ1 and voltage correction coefficient k are used. u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i The method and apparatus described in this invention can accurately measure the actual height of the line above ground at electromagnetic environment observation points, as well as the line's operating voltage and current. By synchronously measuring and sampling at equal intervals with other electromagnetic environment parameters under the control of the same computer, a one-to-one correspondence can be achieved between various electromagnetic environment parameters and parameters such as line voltage, current, and line height. This avoids problems such as the lag in line operating condition data provided by the power grid and the inability to update the line's height above ground in a timely manner, providing conditions for more accurately obtaining the electromagnetic environment level and variation patterns of AC transmission lines at long-term electromagnetic environment observation stations. The results of this invention can be applied to environmental protection acceptance, long-term testing, and line optimization design research of electromagnetic environment in the field of AC transmission and transformation engineering, with high promotion value and broad application prospects.

[0055] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0056] The above and other objects, features, and advantages of the present invention will become more apparent from the more detailed description of the embodiments of the invention in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps:

[0057] Figure 1 This is a flowchart illustrating a method for determining operating parameters of an AC transmission line according to an exemplary embodiment of the present invention;

[0058] Figure 2This is a flowchart illustrating a method for determining voltage correction coefficients and current correction coefficients according to an exemplary embodiment of the present invention.

[0059] Figure 3 This is a schematic diagram of the structure of a device for determining the operating parameters of an AC transmission line provided in an exemplary embodiment of the present invention;

[0060] Figure 4 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0061] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0062] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0063] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0064] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0065] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0066] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0067] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0068] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0069] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0070] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0071] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0072] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0073] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0074] Exemplary methods

[0075] Figure 1 This is a flowchart illustrating a method for determining operating parameters of an AC transmission line according to an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as… Figure 1 As shown in this embodiment, the method for determining the operating parameters of an AC transmission line is used to determine the operating voltage and current of the AC transmission circuit at the electromagnetic environment observation point of the transmission line, as well as the actual height of each phase conductor of the AC transmission line above ground. The method includes:

[0076] Step 101: Measure the height of the lower phase conductor above the ground, the power frequency electric field E1, and the magnetic field strength B1 at the set position of the side phase conductor of the AC transmission line electromagnetic environment observation point.

[0077] In one embodiment, the designated location is typically directly below the phase conductor of an AC transmission line at an electromagnetic environment observation point.

[0078] Step 102, based on the lower phase conductor's height above ground and the pre-measured initial height H of each phase conductor above ground. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 .

[0079] Step 103, based on the actual height H of each phase conductor of the AC transmission line to the ground. m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters is based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the pre-measured phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1;

[0080] Step 104: Based on the power frequency electric field E1, coefficient matrix λ1, and voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit.

[0081] Optionally, before measuring the height of the lower phase conductor above ground at a designated location on the AC transmission line side phase conductor at the transmission line electromagnetic environment observation point, the method further includes:

[0082] Collect the initial height H of each phase conductor of the AC transmission line to ground. m0 and the distance between phases L m0 .

[0083] Optionally, the initial height H of each phase conductor of the AC transmission line to ground is collected. m0 and the distance between phases L m0 Previously, it also included determining the voltage correction factor and the current correction factor.

[0084] Figure 2 This is a flowchart illustrating a method for determining voltage correction coefficients and current correction coefficients according to an exemplary embodiment of the present invention. Figure 2 As shown, the method for determining the voltage correction factor and the current correction factor in this embodiment includes:

[0085] Step 201: Select the central area of ​​the end span of the AC transmission line, and measure the power frequency electric field E0 and magnetic field strength B0 below the transmission line, as well as the height H of each phase conductor of the transmission line above the ground. a and the distance between phases L a ;

[0086] Step 202: Collect the line voltage U0 and line current I0 during the test period;

[0087] Step 203, based on the ground height H of each phase conductor of the AC transmission line a and the distance between phases L a And the conductor structure parameter calculation coefficient matrix λ0, based on the ground height H of each phase conductor of the AC transmission line. a and the distance between phases L a Calculate the coefficient matrix P0;

[0088] Step 204: Calculate the voltage correction coefficient k based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u And calculate the current correction coefficient k based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i .

[0089] In one embodiment, a power frequency field strength meter is used to measure the electric and magnetic field strengths beneath the conductor. The meter is positioned directly beneath the adjacent phase conductor, and the probe is supported by a 1.5m high, highly hydrophobic, insulating bracket. This measurement is based on the height H of each phase conductor of the AC transmission line above ground. a and the distance between phases L a The coefficient matrix λ0 and coefficient matrix P0 for calculating the conductor structure parameters can be achieved using the following formulas.

[0090]

[0091]

[0092]

[0093] In the formula, H0 is the height of the measuring point of the device for measuring the power frequency electric and magnetic field strength above the ground, C0 is the line capacitance matrix, ε0 is the dielectric constant, n is the number of splits of the multi-split conductor, r is the radius of the sub-conductor, and b is the radius of the circumcircle formed by the multi-split conductor.

[0094] Optionally, the voltage correction coefficient k is calculated based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u And calculate the current correction coefficient k based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i include:

[0095] Calculate the voltage correction coefficient k based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u The calculation formula is as follows:

[0096] k u =E0 / (λ0*U0)

[0097] The current correction coefficient k is calculated based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows:

[0098] k i =B0 / (P0*I0).

[0099] In application, the voltage correction factor and current correction factor can be calculated by measuring the electric field and magnetic field at multiple points at the end of the line, calculating multiple correction values ​​and averaging them, which further improves the accuracy of the correction factor.

[0100] Optionally, the height of the lower phase conductor relative to ground and the predetermined initial height H of each phase conductor relative to ground are used as the basis. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 include:

[0101] Calculate the difference C between the lower phase conductor's height above ground and its initial height above ground;

[0102] The actual height of the conductors other than the lower phase conductor in the AC transmission line to the ground is obtained by summing the initial height of the conductors to the ground with the difference C.

[0103] Optionally, the coefficient matrix λ1 and voltage correction coefficient k are determined based on the power frequency electric field E1. u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i The calculation of the operating current I1 of an AC transmission circuit includes:

[0104] Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u The formula for calculating the operating voltage U1 of an AC transmission circuit is as follows:

[0105] U1=k u *λ1*E1

[0106] The current correction coefficient k is calculated based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows:

[0107] I1=k i*P1*B1.

[0108] Actual measurements revealed that although the electric and magnetic field strengths of the line calculated using the simulated charge method were extremely close to the measured values ​​from a power frequency field strength meter, discrepancies still existed between the calculated results and the measured values ​​due to differences between the idealized calculation model and the actual line, as well as the inevitable errors inherent in the power frequency field strength meter. These errors could reach 5% or even greater, while line voltage fluctuations generally remained within 10% of the nominal voltage. The method proposed in this invention can reduce calculation errors and improve the accuracy and effectiveness of voltage and current calculations.

[0109] Exemplary device

[0110] Figure 3 This is a schematic diagram of the structure of a device for determining the operating parameters of an AC transmission line according to an exemplary embodiment of the present invention. Figure 3 As shown in this embodiment, the device for determining the operating parameters of an AC transmission line is used to determine the operating voltage and current of the AC transmission circuit at the electromagnetic environment observation point of the transmission line, as well as the actual height of each phase conductor of the AC transmission line above ground. The device includes:

[0111] The data measurement unit 301 is used to measure the height of the lower phase conductor above the ground, the power frequency electric field E1, and the magnetic field strength B1 at a set position of the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line.

[0112] Data processing unit 302 is used to process data based on the lower phase conductor's height above ground and the pre-measured initial height H of each phase conductor above ground. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 According to the actual height H of each phase conductor of the AC transmission line to the ground m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters; based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the pre-measured phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; based on the power frequency electric field E1, the coefficient matrix λ1 and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit.

[0113] Optionally, the device further includes a parameter setting unit for setting the initial ground height H of each phase conductor of the AC transmission line. m0 and the distance between phases L m0 ; and voltage correction factor ku and current correction factor k i .

[0114] Optionally, the data measurement unit 301 includes:

[0115] The first measurement module is used to measure the power frequency electric field E1 and magnetic field strength B1 directly below the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line.

[0116] The second measurement module is used to measure the height of the lower phase conductor above the ground directly below the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line. It includes two ranging units and one reference unit. The reference unit is used to calibrate the height reference value, one ranging unit is used to measure the height reference value calibrated by the reference unit, and the other ranging unit is located directly below the side phase conductor of the AC transmission line to measure the height of the lower phase conductor above the ground.

[0117] Optionally, the ranging unit is a laser rangefinder, and the reference unit is a scale with a constant height. Two laser rangefinders are used: one directly faces the scale, measuring at a constant reference height; the other is positioned directly below the adjacent phase conductor, measuring the height change of the lower phase conductor. Since all phase conductors are made of the same material, their sag changes are identical, and the height change of the lower phase conductor should represent the height changes of the other phase conductors. Addressing the characteristic that actual transmission lines exhibit very small height changes in the short term but significant changes in the long term, and that traditional laser rangefinders cannot accurately measure line height in poor visibility environments such as rain, snow, and fog, a method of comparative testing using two laser rangefinders is proposed. The measured line height is only adopted when the laser rangefinder measuring the reference height is accurate. In poor visibility conditions, the characteristic of small short-term line height changes is utilized, and the line height measured when the last correct measurement is taken is used, greatly improving the accuracy of the measured line height.

[0118] Optionally, the first measurement module is an all-weather power frequency field strength meter. An all-weather power frequency field strength meter can operate normally in adverse weather conditions such as rain, snow, fog, and high humidity. When the power frequency field strength meter is connected to an external power supply, it should operate normally without affecting the measured values. Laser power supply can be used to provide electrical isolation between the power supply side and the field strength meter probe.

[0119] Optionally, in the above-described device embodiments of the present invention, the data processing unit determines the initial ground height H of each phase conductor based on the lower phase conductor's height above ground and the predetermined initial ground height H of each phase conductor. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 According to the actual height H of each phase conductor of the AC transmission line to the ground m1 and the predetermined phase-to-phase distance L between each phase conductor. m0The coefficient matrix λ1 for calculating conductor structural parameters; based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the predetermined phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; based on the power frequency electric field E1, the coefficient matrix λ1 and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit, where:

[0120] Based on the lower phase conductor's height above ground and the predetermined initial height H of each phase conductor above ground. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 include:

[0121] Calculate the difference C between the lower phase conductor's height above ground and its initial height above ground;

[0122] The actual height of the conductors other than the lower phase conductor in the AC transmission line to the ground is obtained by summing the initial height of the conductors to the ground with the difference C.

[0123] Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u The formula for calculating the operating voltage U1 of an AC transmission circuit is as follows:

[0124] U1=k u *λ1*E1

[0125] The current correction coefficient k is calculated based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows:

[0126] I1=k i *P1*B1.

[0127] The data processing unit can be a computer, capable of synchronously testing and rapidly acquiring electric field, magnetic field, and line height data. It can directly calculate the line voltage and current based on the measurement results, and display and store the measured and calculated data. The intervals at which the computer acquires electric and magnetic fields should be consistent with other electromagnetic environment parameters, ensuring a good one-to-one correspondence between the line voltage and current and the various electromagnetic environment parameters.

[0128] The device for determining the operating parameters of an AC transmission line provided in this embodiment measures the height of the lower phase conductor above ground, the power frequency electric field E1, and the magnetic field strength B1 directly below the side phase conductor of the AC transmission line at an electromagnetic environment observation point. Based on the height of the lower phase conductor above ground and the pre-measured initial height H of each phase conductor above ground... m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 Based on the actual height H of each phase conductor of the AC transmission line to the ground m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 and coefficient matrix P1 are calculated based on the conductor structure parameters. Finally, based on the power frequency electric field E1, the coefficient matrix λ1 and voltage correction coefficient k are used. u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i The steps for calculating the operating current I1 of the AC transmission circuit are the same as those for determining the operating parameters of the AC transmission line provided in this embodiment, and the technical effects achieved are also the same, so they will not be repeated here.

[0129] Exemplary electronic devices

[0130] Figure 4 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. The electronic device may be either or both of a first device and a second device, or a standalone device independent of them, which may communicate with the first device and the second device to receive acquired input signals from them. Figure 4 A block diagram of an electronic device according to an embodiment of the present disclosure is shown. Figure 4 As shown, the electronic device includes one or more processors 401 and memory 402.

[0131] The processor 401 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0132] The memory 402 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 401 may execute the program instructions to implement the methods for information mining of historical change records and / or other desired functions of the software programs of the disclosed embodiments described above. In one example, the electronic device may also include an input device 403 and an output device 404, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0133] In addition, the input device 403 may also include, for example, a keyboard, a mouse, etc.

[0134] The output device 404 can output various information to the outside. The output device 404 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0135] Of course, for the sake of simplicity, Figure 4 Only some of the components of the electronic device relevant to this disclosure are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0136] Exemplary computer program products and computer-readable storage media

[0137] In addition to the methods and apparatus described above, embodiments of this disclosure may also be computer program products comprising computer program instructions that, when executed by a processor, cause the processor to perform the steps of the methods for determining operating parameters of AC transmission lines according to various embodiments of this disclosure as described in the "Exemplary Methods" section of this specification.

[0138] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this disclosure. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on a user's computing device, partially on a user's computing device, as a standalone software package, partially on a user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0139] Furthermore, embodiments of this disclosure may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps in the methods for determining operating parameters of AC transmission lines according to various embodiments of this disclosure as described in the "Exemplary Methods" section above.

[0140] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0141] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0142] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0143] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0144] The methods and apparatus of this disclosure may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this disclosure are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, this disclosure may also be implemented as a program recorded on a recording medium, the program including machine-readable instructions for implementing the methods according to this disclosure. Thus, this disclosure also covers recording media storing programs for performing the methods according to this disclosure.

[0145] It should also be noted that in the apparatus, devices, and methods of this disclosure, the components or steps are decomposable and / or recombinable. Such decomposition and / or recombination should be considered equivalent to the present disclosure. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0146] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method for determining operating parameters of an AC transmission line, used to determine the operating voltage and current of the AC transmission circuit at an electromagnetic environment observation point of the transmission line, as well as the actual height of each phase conductor of the AC transmission line above ground, characterized in that, The method includes: Determine the voltage correction factor k u and current correction factor k i ,include: Select the central area of ​​the end span of the AC transmission line, and measure the power frequency electric field E0 and magnetic field strength B0 below the transmission line, as well as the height H of each phase conductor of the transmission line above the ground. a and the distance between phases L a ; The line voltage U0 and line current I0 were collected during the test period; According to the height H of each phase conductor of the AC transmission line above the ground a and the distance between phases L a And the conductor structure parameter calculation coefficient matrix λ0, based on the ground height H of each phase conductor of the AC transmission line. a and the distance between phases L a The coefficient matrix P0 is calculated using the following formula: In the formula, H0 is the height of the measuring point of the device for measuring the power frequency electric and magnetic field strength above the ground, C0 is the line capacitance matrix, ε0 is the dielectric constant, n is the number of splits of the multi-split conductor, r is the radius of the sub-conductor, and b is the radius of the circumcircle formed by the multi-split conductor. Calculate the voltage correction coefficient k based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u And calculate the current correction coefficient k based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows: k u =E0 / (λ0*U0) to i =B0 / (P0*I0); The height of the lower phase conductor to the ground, the power frequency electric field E1, and the magnetic field strength B1 are measured at the set position of the side phase conductor of the AC transmission line electromagnetic environment observation point. Based on the lower phase conductor's height above ground and the pre-measured initial height H of each phase conductor above ground... m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 ; Based on the actual ground height H of each phase conductor of the AC transmission line m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters is based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the pre-measured phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit.

2. The method according to claim 1, characterized in that, Before measuring the height of the lower phase conductor above ground at a designated location on the side phase conductor of the AC transmission line electromagnetic environment observation point, the following steps are also included: Collect the initial height H of each phase conductor of the AC transmission line to ground. m0 and the distance between phases L m0 .

3. The method according to claim 1, characterized in that, This is based on the ground height of the lower phase conductor and the predetermined initial ground height H of each phase conductor. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 include: Calculate the difference C between the lower phase conductor's height above ground and its initial height above ground; The actual height of the conductors other than the lower phase conductor in the AC transmission line to the ground is obtained by summing the initial height of the conductors to the ground with the difference C.

4. The method according to claim 1, characterized in that, Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i The calculation of the operating current I1 of an AC transmission circuit includes: Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u The formula for calculating the operating voltage U1 of an AC transmission circuit is as follows: U1= E1 / (k u *λ1) Based on the magnetic field strength B1, coefficient matrix P1, and current correction coefficient k i The formula for calculating the operating current I1 of an AC transmission circuit is as follows: I1= B1 / (k i *P1).

5. A device for determining operating parameters of an AC transmission line, used to determine the operating voltage and operating current of the AC transmission circuit at an electromagnetic environment observation point of the transmission line, as well as the actual height of each phase conductor of the AC transmission line above ground, characterized in that, The device includes: The parameter setting unit is used to set a specific voltage correction coefficient k. u and current correction factor k i Among them, the voltage correction coefficient k is determined. u and current correction factor k i ,include: Select the central area of ​​the end span of the AC transmission line, and measure the power frequency electric field E0 and magnetic field strength B0 below the transmission line, as well as the height H of each phase conductor of the transmission line above the ground. a and the distance between phases L a ; The line voltage U0 and line current I0 were collected during the test period; According to the height H of each phase conductor of the AC transmission line above the ground a and the distance between phases L a And the conductor structure parameter calculation coefficient matrix λ0, based on the ground height H of each phase conductor of the AC transmission line. a and the distance between phases L a The coefficient matrix P0 is calculated using the following formula: In the formula, H0 is the height of the measuring point of the device for measuring the power frequency electric and magnetic field strength above the ground, C0 is the line capacitance matrix, ε0 is the dielectric constant, n is the number of splits of the multi-split conductor, r is the radius of the sub-conductor, and b is the radius of the circumcircle formed by the multi-split conductor. Calculate the voltage correction coefficient k based on the power frequency electric field E0, the coefficient matrix λ0, and the line voltage U0. u And calculate the current correction coefficient k based on the magnetic field strength B0, the coefficient matrix P0, and the line current I0. i The calculation formula is as follows: k u =E0 / (λ0*U0) to i =B0 / (P0*I0); The data measurement unit is used to measure the height of the lower phase conductor above the ground, the power frequency electric field E1, and the magnetic field strength B1 at a set position of the side phase conductor of the AC transmission line electromagnetic environment observation point. The data processing unit is used to determine the initial ground height H of each phase conductor based on the lower phase conductor's height above ground and the pre-measured initial ground height H. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 According to the actual height H of each phase conductor of the AC transmission line to the ground m1 And the pre-measured and determined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters; based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the pre-measured phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; based on the power frequency electric field E1, the coefficient matrix λ1 and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit.

6. The apparatus according to claim 5, characterized in that, The parameter setting unit is also used to set the initial ground height H of each phase conductor of the AC transmission line, which has been measured and determined in advance. m0 and the distance between phases L m0 .

7. The apparatus according to claim 5, characterized in that, The data measurement unit includes: The first measurement module is used to measure the power frequency electric field E1 and magnetic field strength B1 directly below the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line. The second measurement module is used to measure the height of the lower phase conductor above the ground directly below the side phase conductor of the AC transmission line at the electromagnetic environment observation point of the transmission line. It includes two ranging units and one reference unit. The reference unit is used to calibrate the height reference value, one ranging unit is used to measure the height reference value calibrated by the reference unit, and the other ranging unit is located directly below the side phase conductor of the AC transmission line to measure the height of the lower phase conductor above the ground.

8. The apparatus according to claim 7, characterized in that, The ranging unit is a laser rangefinder, and the reference unit is a scale with a constant height.

9. The apparatus according to claim 7, characterized in that, The first measurement module is an all-weather power frequency field strength meter.

10. The apparatus according to claim 5, characterized in that, The data processing unit calculates the ground height of the lower phase conductor and the predetermined initial ground height H of each phase conductor. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 According to the actual height H of each phase conductor of the AC transmission line to the ground m1 and the predetermined phase-to-phase distance L between each phase conductor. m0 The coefficient matrix λ1 for calculating conductor structural parameters; based on the actual ground height H of each phase conductor of the AC transmission line. m1 and the predetermined phase-to-phase distance L between each phase conductor m0 Calculate the coefficient matrix P1; based on the power frequency electric field E1, the coefficient matrix λ1 and the voltage correction coefficient k u Calculate the operating voltage U1 of the AC transmission circuit, and based on the magnetic field strength B1, the coefficient matrix P1, and the current correction coefficient k. i Calculate the operating current I1 of the AC transmission circuit, where: Based on the lower phase conductor's height above ground and the predetermined initial height H of each phase conductor above ground. m0 Determine the actual height H of each phase conductor of the AC transmission line above the ground. m1 include: Calculate the difference C between the lower phase conductor's height above ground and its initial height above ground; The actual height of the conductors other than the lower phase conductor in the AC transmission line to the ground is obtained by summing the initial height of the conductors to the ground with the difference C. Based on the power frequency electric field E1, the coefficient matrix λ1, and the voltage correction coefficient k u The formula for calculating the operating voltage U1 of an AC transmission circuit is as follows: U1= E1 / (k u *λ1) Based on the magnetic field strength B1, coefficient matrix P1, and current correction coefficient k i The formula for calculating the operating current I1 of an AC transmission circuit is as follows: I1= B1 / (k i *P1).

11. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-4.

12. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-4.

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