Power transmission line operation support device, control method and program for power transmission line operation support device

Abstract

A power line operation assistance device that assists with operation of a power line constructed on a power transmission tower together with an optical fiber composite overhead line, the power line operation assistance device comprising: a weather data acquisition unit that acquires prescribed types of weather data including air temperature, wind conditions, and insolation at a prescribed position on the power line; a current value acquisition unit that acquires a current value flowing through the prescribed position on the power line; and a first temperature calculation unit that inputs the weather data and the current value at the prescribed position to a first relational expression representing the relationship between the current value, temperature, wind conditions, and insolation of the power line and the temperature of the power line, thereby calculating the temperature of the power line at the prescribed position. The weather data acquisition unit acquires wind conditions calculated on the basis of a result of measuring a vibration state of the optical fiber composite overhead line, which is measured using a distributed multipoint vibration measurement method, as the wind conditions at the prescribed position.

Description

Technical Field

[0001] The present invention relates to a power transmission line operation support device, a control method for the power transmission line operation support device, and a program.

Background Art

[0002] In recent years, with the spread of renewable energy, an increase in the current capacity of power transmission and transformation equipment has been demanded. However, to increase the current capacity, large-scale equipment enhancement is necessary, which requires a large amount of cost.

[0003] On the other hand, the current capacity is determined as a current value such that problems such as a decrease in mechanical strength when the temperature of the power transmission line rises and contact with trees do not occur. However, since the worst conditions are determined from past meteorological observation data of temperature, wind conditions (wind direction, wind speed), and solar radiation amount, and the temperature of the power transmission line is calculated, the actual temperature of the power transmission line is considered to be lower than expected.

[0004] Therefore, dynamic rating that acquires meteorological conditions such as temperature in real time and dynamically determines the current capacity has attracted attention. In addition, technologies for measuring the temperature of power transmission lines have also been developed, such as the technology disclosed in Patent Document 1.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] To perform dynamic rating, it is important to obtain accurate meteorological data and calculate the temperature of power lines accurately. However, power lines are often installed in mountainous areas with complex terrain, resulting in localized differences in wind conditions. Furthermore, because they are erected at a height of several tens of meters above the ground, obtaining accurate wind conditions, especially at the location of the power lines, is not easy. Wind conditions also change with the seasons and time of day, so in order to accurately understand the wind conditions for each span, it is necessary to install anemometers along all spans. However, installing anemometers along power lines would require installing a huge number of anemometers, resulting in significant costs.

[0007] This invention was made in view of the above background, and aims to provide a power transmission line operation support device, a control method for the power transmission line operation support device, and a program that enable more accurate calculation of the temperature of a power transmission line by more accurately acquiring wind conditions at a predetermined location on the power transmission line. [Means for solving the problem]

[0008] One of the present inventions for achieving the above objective is a power transmission line operation support device for supporting the operation of a power transmission line installed on a power transmission tower together with an optical fiber composite overhead ground wire, comprising: a weather data acquisition unit that acquires predetermined types of weather data including temperature, wind conditions, and solar radiation at a predetermined location on the power transmission line; a current value acquisition unit that acquires the current value flowing through the predetermined location on the power transmission line; and a first temperature calculation unit that calculates the temperature of the power transmission line at a predetermined location by inputting the weather data and current value at the predetermined location into a first relational expression that represents the relationship between the current value, temperature, wind conditions, and solar radiation of the power transmission line and the temperature of the power transmission line. A current capacity calculation unit calculates the current capacity at the predetermined location by inputting weather data at the predetermined location and a first allowable temperature specified for the power transmission line into the first relational expression, The weather data acquisition unit acquires wind conditions calculated based on the measurement results of the vibration state of the optical fiber composite overhead ground wire, measured using a distributed multi-point vibration measurement method, as wind conditions at the predetermined location.

[0009] Further details regarding the problems disclosed in this application, and their solutions, will be made clear in the section on embodiments for carrying out the invention and in the drawings.

Advantages of the Invention

[0010] According to the present invention, by more accurately obtaining the wind conditions at a predetermined position of the transmission line, it becomes possible to more accurately calculate the temperature of the transmission line.

Brief Description of the Drawings

[0011] [Figure 1] It is a diagram showing a transmission line operation support system. [Figure 2] It is a diagram explaining a mechanism for measuring the vibration state of each measurement point. [Figure 3A] It is an example of time-series data of measured values (parallel direction). [Figure 3B] It is an example of time-series data of measured values (orthogonal direction). [Figure 4A] It is an example of a difference prediction formula (parallel direction). [Figure 4B] It is an example of a difference prediction formula (orthogonal direction). [Figure 5A] It is an example of time-series data of predicted values (parallel direction). [Figure 5B] It is an example of time-series data of predicted values (orthogonal direction). [Figure 6A] It is a diagram showing the main configuration of a wind condition information providing device. [Figure 6B] It is a diagram explaining the main functions of a wind condition information providing device. [Figure 7A] It is a diagram showing the main configuration of a transmission line operation support device. [Figure 7B] It is a diagram explaining the main functions of a transmission line operation support device. [Figure 8] It is a flowchart showing the processing flow of a transmission line operation support device. [Figure 9] It is a flowchart showing the processing flow of a transmission line operation support device. [Figure 10] It is a flowchart showing the processing flow of a transmission line operation support device. [Figure 11] It is a diagram for explaining the processing of a transmission line operation support device. [Figure 12]It is a diagram showing the first relational expression. [Figure 13] It is a diagram showing the first relational expression and the second relational expression.

Embodiment for Implementing the Invention

[0012] From the description in this specification and the attached drawings, at least the following matters become clear. Hereinafter, the present invention will be described with reference to the attached drawings according to one embodiment thereof.

[0013] ==Overall Configuration== The overall configuration of the transmission line operation support system 1000 according to an embodiment of the present invention is shown in FIG. 1.

[0014] The transmission line operation support system 1000 is configured such that a wind condition information providing device 100 and a transmission line operation support device 300 are communicably connected via a network 500 such as the Internet, a LAN (Local Area Network), or a telephone network.

[0015] The transmission line operation support device 300 is an information processing device that supports the operation of the transmission line 3 by an electric power company such as a power transmission business operator, and performs various information processes for operating the transmission line 3 so that the temperature, current, sag, etc. of the transmission line 3 do not exceed a predetermined reference value.

[0016] When the temperature of the transmission line 3 rises, its mechanical strength decreases. Also, the sag increases, increasing the possibility of contact between adjacent transmission lines 3 and contact with surrounding trees, etc. Therefore, an allowable temperature is defined for the transmission line 3, and the power company operates the transmission line 3 so as not to exceed this allowable temperature.

[0017] The allowable temperature of the transmission line 3 is defined, for example, as 90°C for a transmission line 3 made of ordinary aluminum (however, 120°C is allowed for a short time), and 150°C for a heat-resistant aluminum transmission line 3 (however, 180°C is allowed for a short time).

[0018] The temperature of power transmission line 3 changes under the influence of various physical quantities, such as the diameter and resistance of power transmission line 3, ambient temperature, current value, wind conditions, and solar radiation. As will be explained in detail later, various relational equations have been proposed to express the relationship between the temperature of power transmission line 3 and these physical quantities that affect the temperature of power transmission line 3, and by using these relational equations, the temperature of power transmission line 3 can be estimated.

[0019] However, obtaining wind conditions around power transmission line 3 is not easy. Most power transmission lines 3 are installed in mountainous areas with complex terrain and locally variable wind conditions, and are also erected at an altitude of several tens of meters above the ground, so the wind conditions measured there may not be the same as those measured at ground level.

[0020] Therefore, the power transmission line operation support device 300 according to this embodiment uses more accurate wind conditions measured near the power transmission line 3 by the wind condition information providing device 100. This configuration makes it possible to calculate the temperature of the power transmission line 3 more accurately.

[0021] The wind condition information providing device 100 is an information processing device such as a computer installed in a substation 6, etc., and measures wind conditions at a predetermined location on the transmission line 3 by using an optical fiber composite overhead ground wire 4 (OPGW: optical ground wire) which is installed on the transmission tower 2 together with the transmission line 3.

[0022] The wind condition information providing device 100 according to this embodiment uses the optical fiber 4a of the OPGW4 (optical ground wire) (optical fiber composite overhead ground wire) installed on the power transmission line 3 as a sensor, and acquires wind conditions (wind direction, wind speed) at each measurement point based on the vibration state (vibration intensity, vibration frequency) of the optical fiber 4a at each of the multiple points along the optical fiber 4a (hereinafter each point will be referred to as a "measurement point") by a technique (distributed multi-point vibration measurement method (hereinafter referred to as "DAS" (Distributed Acoustic Sensing)) at each measurement point based on the vibration state at each measurement point. In addition, DAS acquires the vibration state of each measurement point by the principle of C-OTDR (Coherent detection Optical Time Domain Reflectometer), for example.

[0023] In this embodiment, the predetermined location of the power transmission line 3 is determined by the span, which is the section between two adjacent power transmission towers 2. In other words, wind conditions are measured in units of span.

[0024] Figure 2 illustrates how the wind condition information device 100 measures the vibration state at each point (each measurement point) on the optical fiber 4a.

[0025] As shown in Figure 2, the wind condition information device 100 injects an optical pulse (laser pulse; hereinafter also referred to as "incident light") from the end face of the optical fiber 4a and measures the rate of change in the phase difference of the backscattered light of the optical pulse (≒stretching frequency) at each measurement point. The above phase difference is estimated from the intensity change due to interference between the backscattered light.

[0026] The wind condition information provider 100 then determines the longitudinal and transverse vibration frequencies of the optical fiber 4a at each measurement point (for example, vibration frequencies in the range of up to 10 kHz) based on the measured rate of change. The wind condition information provider 100 also determines the vibration intensity (spectral intensity, vibration amplitude) at each measurement point based on the phase difference for each vibration frequency.

[0027] Furthermore, the wind condition information device 100 determines the position of each measurement point (distance from the end face) based on the elapsed time from the time the incident light enters the end face to the time the reflected light is received.

[0028] The measurement points are set along the optical fiber 4a at predetermined intervals d(m) shorter than the span of the transmission tower 2 (0(m), d(m), ..., N(m), N+d(m), N+2d(m)). For example, if the predetermined interval d is 5(m) and measurement points are set within a range of up to 70(km), approximately 14,000 measurement points will be set along the optical fiber 4a.

[0029] The wind condition information provider 100 acquires the vibration state at a predetermined position (predetermined span) of the power transmission line 3 based on the vibration state at each measurement point. In this embodiment, the wind condition information provider 100 acquires the vibration state for each span.

[0030] For example, as described in Non-Patent Document 1 ("Study on the Vibration Characteristics of Power Transmission Lines in Strong Winds," Urban Disaster Management, Ken Inayoshi, Kyushu University, Master's Thesis List, URL: https: / / www.hues.kyushu-u.ac.jp / education / student / pdf / 2003 / 2HE02019E.pdf (Retrieved May 18, 2022)), the vibration state of the optical fiber 4a in the span has a certain correlation with the wind conditions in the span. Therefore, by generating a statistical model representing the above correlation in advance and inputting the vibration state obtained for the measurement points in the span into the generated statistical model, the wind conditions in the span can be obtained. Note that the vibration mode (natural vibration mode) of the vibration state of the optical fiber 4a differs depending on the wind speed (the vibration state becomes nonlinear with respect to changes in wind speed), so the above statistical model is generated for each range of wind speed (for example, a statistical model is prepared for when the wind speed is less than 3 (m / s) and a statistical model is prepared for when the wind speed is 3 (m / s) or more).

[0031] Furthermore, since the vibration characteristics of the optical fiber 4a differ for each span due to differences in span length and the installation conditions of OPGW4, the above statistical model is generated for each span.

[0032] Furthermore, if the predetermined interval d(m) is shorter than the span of the transmission tower 2, multiple measurement points will be included in one span. In this case, the method for obtaining the wind conditions for that span based on the vibration state of each measurement point is not necessarily limited. For example, the wind conditions of the measurement point with the highest wind speed among the multiple measurement points, or the average value of the wind conditions of each measurement point, may be used as the wind conditions for that span.

[0033] The wind condition information provider 100 inputs the vibration state of the measurement points in the span into the statistical model described above, and determines the wind velocity components (referred to as the "parallel direction component" and the "orthogonal direction component," respectively) for the direction along the optical fiber 4a (longitudinal wave direction; the direction in which the optical fiber 4a extends; hereinafter referred to as the "parallel direction") and the direction perpendicular to the direction in which the optical fiber 4a extends (transverse wave direction; hereinafter referred to as the "orthogonal direction"), and determines the wind conditions (wind direction, wind speed) in the span based on the determined parallel direction component and orthogonal direction component.

[0034] Figure 3A shows an example of time-series data of the parallel component (hereinafter referred to as "measured value (parallel direction)") in a certain span, obtained by the wind condition information device 100 as described above. Figure 3B also shows an example of time-series data of the orthogonal component (hereinafter referred to as "measured value (orthogonal direction)") in the same span, obtained by the wind condition information device 100. In the graphs shown in Figures 3A and 3B, the horizontal axis represents time, and the vertical axis represents wind speed (m / s).

[0035] Furthermore, the wind condition information provider 100 performs mutual conversion between wind conditions expressed in absolute direction (absolute direction with north being 0° (360°) and south being 180°) and wind conditions for each span, which are obtained as parallel and orthogonal components based on a database showing the installation status of power transmission towers 2 and power transmission lines 3 (for example, an equipment information database (equipment ledger database) managed by the administrator of power facilities such as power companies). This makes it possible to compare and combine with wind conditions provided by, for example, the Japan Meteorological Agency.

[0036] The wind condition information device 100 transmits the current wind conditions for the span, obtained as described above, to the power transmission line operation support device 300.

[0037] Furthermore, the wind condition information provider 100 may use the time-series data of wind conditions for the span obtained as described above to predict future wind conditions for the span and transmit the predicted wind conditions for the span to the power transmission line operation support device 300.

[0038] In this case, the wind condition information provider 100 makes the above prediction by correcting the forecast values ​​of wind conditions obtained from weather information provided by a weather information provider. Specifically, the wind condition information provider 100 generates an approximation formula (hereinafter referred to as the "difference prediction formula") that represents the correlation between the difference between the time-series data of wind conditions for each span obtained as described above (hereinafter referred to as the "first time-series data") and the time-series data of forecast values ​​of wind conditions obtained from weather information (hereinafter referred to as the "second time-series data") and the value of the second time-series data. By reflecting (adding) the difference obtained from the above difference prediction formula to the forecast values ​​of wind conditions obtained from weather information, the future wind conditions for each span are predicted.

[0039] Figure 4A shows an example of a graph representing the difference prediction formula for the wind direction component in the parallel direction (hereinafter referred to as the "difference prediction formula (parallel direction)"). Figure 4B shows an example of a graph representing the difference prediction formula for the wind direction component in the orthogonal direction (hereinafter referred to as the "difference prediction formula (orthogonal direction)").

[0040] Furthermore, Figure 5A shows an example of time-series data of future parallel-direction components (hereinafter referred to as "predicted values ​​(parallel direction)") predicted by reflecting (adding) the difference obtained from the difference prediction formula (parallel direction) to the parallel-direction forecast values ​​of wind conditions obtained from meteorological information (hereinafter referred to as "meteorological information forecast values ​​(parallel direction)").

[0041] Furthermore, Figure 5B shows an example of time-series data of future orthogonal components (hereinafter referred to as "predicted values ​​(orthogonal directions)") predicted by reflecting (adding) the difference obtained from the difference prediction formula (orthogonal directions) to the forecast values ​​of wind conditions obtained from meteorological information (hereinafter referred to as "meteorological information forecast values ​​(orthogonal directions)").

[0042] Figure 6A shows the main components of the wind condition information providing device 100. As shown in Figure 6A, the wind condition information providing device 100 includes a processor 101, main memory 102 (memory), auxiliary storage device 103 (external storage device), input device 104, output device 105, communication device 106, and optical analysis unit 107. These are connected to each other via a bus or communication cable. In addition, the wind condition information providing device 100 may be implemented in whole or in part using virtual information processing resources, such as a virtual server provided by a cloud system.

[0043] The processor 101 is composed of components such as a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), FPGA (Field Programmable Gate Array), ASIC (Application Specific Integrated Circuit), and AI (Artificial Intelligence) chip.

[0044] The main memory 102 is a memory device used by the processor 101 when executing a program, and can be, for example, ROM (Read Only Memory), RAM (Random Access Memory), or non-volatile memory (NVRAM (Non-Volatile RAM)).

[0045] The auxiliary storage device 103 is a device for storing programs and data, and can consist of, for example, an SSD (Solid State Drive), a hard disk drive, an optical storage device (CD (Compact Disc), DVD (Digital Versatile Disc), etc.), a storage system, an IC card, a reader / write device for non-temporary recording media such as SD cards and optical recording media, or a non-temporary storage area of ​​a cloud server. The auxiliary storage device 103 can read programs and data from non-temporary recording media or other information processing devices equipped with non-temporary storage devices via a recording media reader or a communication device 106. Programs and data stored in the auxiliary storage device 103 are read into the main memory 102 as needed.

[0046] The input device 104 is an interface that accepts information input from an external source, and can be, for example, a keyboard, mouse, touch panel, card reader, pen-input tablet, or voice input device.

[0047] The output device 105 is an interface for outputting various information such as processing progress and processing results to the outside. The output device 105 may be, for example, a display device that visualizes the above-mentioned information (LCD monitor, LCD (Liquid Crystal Display), graphics card, etc.), a device that converts the above-mentioned information into sound (speaker, etc.), or a device that converts the above-mentioned information into text (printer, etc.). For example, the wind condition information providing device 100 may be configured to input and output information to and from other devices via the communication device 106.

[0048] The input device 104 and the output device 105 constitute a user interface that enables interactive processing with the user (receiving information, providing information, etc.).

[0049] The communication device 106 is a device that enables communication with other devices via a network 500 (LAN (Local Area Network), WAN (Wide Area Network), the Internet, a public communication network, a dedicated line, etc.). The communication device 106 is a wired or wireless communication interface that enables communication with other devices via a communication medium, such as a NIC (Network Interface Card), a wireless communication module, or a USB module.

[0050] The optical analysis unit 107 is a device that measures the vibration state of a measurement point using DAS, and includes a vibration measuring instrument and signal processing circuit using C-OTDR. The optical analysis unit 107 includes a CW (continuous wave) laser light source that generates laser light (optical pulses) to be input to the end face of the optical fiber 4a, an optical pulse generator, an optical amplifier, optical instruments (optical detector, optical interferometer), and a signal processing circuit (phase calculation circuit, etc.). The connection between the optical analysis unit 107 and the optical fiber 4a is made, for example, by optically connecting the output part of the laser light source of the optical analysis unit 107 to the connection port (socket) of the core wire of the OPGW4 provided in the substation 6, and the connection does not cause any impact on the power system such as a power outage.

[0051] The wind condition information providing device 100 may have, for example, an operating system, a file system, a DBMS (Database Management System) (relational database, NoSQL, etc.), a KVS (Key-Value Store), etc. installed.

[0052] The various functions of the wind condition information provider 100 are realized either by the processor 101 reading and executing a program stored in the main memory 102, or by the hardware (FPGA, ASIC, AI chip, etc.) that constitutes the wind condition information provider 100 itself. The wind condition information provider 100 stores various types of information (data) as, for example, database tables or files managed by a file system.

[0053] Figure 6B is a block diagram illustrating the main functions of the wind condition information providing device 100. As shown in Figure 6B, the wind condition information providing device 100 includes the following functions: a storage unit 110, a vibration state measurement unit 120, a span-by-span wind condition acquisition unit 130, a weather information acquisition unit 135, a span-by-span difference prediction formula generation unit 140, a span-by-span wind condition prediction unit 145, a span-by-span current wind condition provision unit 150, and a span-by-span wind condition prediction result provision unit 155.

[0054] Of the above functions, the memory unit 110 stores the vibration state for each measurement point 111, the statistical model 112, the current wind conditions for each span 113, the weather information 114, the difference prediction formula for each span 115, and the wind condition prediction results for each span 116.

[0055] The vibration state measurement unit 120 measures the vibration state at each measurement point using DAS and manages the measured vibration state (vibration intensity, vibration frequency) for each measurement point as the vibration state 111 for each measurement point.

[0056] The span-by-span wind condition acquisition unit 130 acquires the vibration state for each span of the power transmission line 3 (between adjacent power transmission towers 2) based on the vibration state at each measurement point, and acquires the wind conditions for each span by inputting the acquired vibration state into the corresponding statistical model 112 (the aforementioned statistical model generated for each range of wind speed and for each span). The span-by-span wind condition acquisition unit 130 manages the acquired time-series data of the wind conditions (first time-series data) as the current wind conditions for each span 113.

[0057] The weather information acquisition unit 135 acquires weather information (latest information, past information) used for forecasting wind conditions for each span from weather information providers such as the Japan Meteorological Agency via a network 500 such as the Internet. The weather information includes current wind conditions and forecast values ​​for wind conditions in the area where the power transmission line 3 is installed. The weather information acquisition unit 135 manages the acquired weather information as weather information 114. In addition, the weather information acquisition unit 135 performs mutual conversion between the wind conditions for each span, which are obtained as parallel and orthogonal components, and the wind conditions expressed in absolute direction.

[0058] The span-by-span difference prediction formula generation unit 140 generates the aforementioned difference prediction formulas for each span (difference prediction formula (parallel direction), difference prediction formula (orthogonal direction)). The span-by-span difference prediction formula generation unit 140 manages the generated span-by-span difference prediction formulas as span-by-span difference prediction formulas 115.

[0059] The span-by-span wind condition prediction unit 145 predicts the wind conditions for each span by reflecting the difference obtained from the difference prediction formula (difference prediction formula (parallel direction), difference prediction formula (orthogonal direction)) to the forecast values ​​of wind conditions obtained from meteorological information. The span-by-span wind condition prediction unit 145 manages the predicted wind conditions for each span as the span-by-span wind condition prediction result 116.

[0060] The span-by-span current wind conditions provision unit 150 provides (transmits) the span-by-span current wind conditions 113, which are managed by the span-by-span wind conditions acquisition unit 130, to the power transmission line operation support device 300.

[0061] The span-by-span wind condition forecast result provision unit 155 provides (transmits) the span-by-span wind condition forecast results 116 managed by the span-by-span wind condition forecast unit 145 to the power transmission line operation support device 300.

[0062] Furthermore, OPGW4 (optical fiber 4a) is often installed at the top of the transmission tower 2, etc., and does not strictly coincide with the altitude of the transmission line 3. Therefore, for example, the wind conditions in the current wind conditions per span 113 and the wind condition forecast results per span 116 may be converted to the altitude of the transmission line 3 by taking the wind gradient into consideration, and then provided to the transmission line operation support device 300.

[0063] Figure 7A shows the main components of the power transmission line operation support device 300. As shown in Figure 7A, the power transmission line operation support device 300 includes a processor 301, a main memory 302 (memory), an auxiliary memory 303 (external memory), an input device 304, an output device 305, and a communication device 306. These are connected to each other via a bus, communication cables, etc.

[0064] The above configuration is the same as that of the processor 101, main memory 102, auxiliary memory 103, input device 104, output device 105, and communication device 106 of the wind condition information providing device 100, so a detailed explanation is omitted.

[0065] The various functions of the power transmission line operation support device 300 are realized either by the processor 301 reading and executing programs stored in the main memory 302, or by the hardware constituting the power transmission line operation support device 300 itself. The power transmission line operation support device 300 stores various types of information (data) as, for example, database tables or files managed by a file system.

[0066] Figure 7B is a block diagram illustrating the main functions of the power transmission line operation support device 300. As shown in Figure 7B, the power transmission line operation support device 300 includes the following functions: a weather data acquisition unit 310, a current value acquisition unit 320, a first temperature calculation unit 330A, a second temperature calculation unit 330B, a temperature information output unit 340, a current capacity calculation unit 350, a current information output unit 360, an allowable temperature calculation unit 370, a sag acquisition unit 380, and a sag information output unit 390.

[0067] The weather data acquisition unit 310 acquires predetermined types of weather data, including temperature, wind conditions, and solar radiation, at predetermined locations on the power transmission line 3.

[0068] Regarding wind conditions, the meteorological data acquisition unit 310 acquires values ​​measured by the wind condition information providing device 100. Specifically, the meteorological data acquisition unit 310 acquires wind conditions calculated based on the measurement results of the vibration state of the OPGW4 measured using the distributed multi-point vibration measurement method, as wind conditions at a predetermined location on the power transmission line 3. In this manner, wind conditions measured in the vicinity of a predetermined location on the power transmission line 3 can be acquired, making it possible to obtain accurate wind conditions.

[0069] On the other hand, for temperature and solar radiation, the meteorological data acquisition unit 310 acquires observed values ​​(temperature, solar radiation) from the nearest meteorological observation point to the predetermined location as the values ​​for the predetermined location. These meteorological observations may be conducted by a power company or by a meteorological information provider such as the Japan Meteorological Agency.

[0070] In any case, if values ​​(temperature, solar radiation) are obtained from multiple weather observation points, the weather data acquisition unit 310 should apportion each value according to the distance between each weather observation point and a predetermined position on the power transmission line 3, and acquire the values ​​(temperature, solar radiation) at the predetermined position on the power transmission line 3.

[0071] In this embodiment, the predetermined position of the power transmission line 3 is determined by the span between two adjacent power transmission towers 2. Therefore, when apportioning values ​​from multiple weather observation points, the calculation can be performed based on the distance from each weather observation point to any point within the span (for example, the center of the span).

[0072] The current value acquisition unit 320 acquires the current value flowing through a predetermined location on the power transmission line 3. The current value acquisition unit 320 acquires the current value from, for example, a current measuring instrument (not shown) installed in the substation 6 or on the power transmission line 3, or from a computer (not shown) that manages the current value of the power transmission line 3. If this computer has calculated a predicted value for the current value of the power transmission line 3 at a predetermined future target point in time, the current value acquisition unit 320 may acquire this predicted value. Alternatively, the current value acquisition unit 320 may calculate a predicted value for the current value of the power transmission line 3.

[0073] The first temperature calculation unit 330A calculates the temperature of the power transmission line 3 at a predetermined location based on meteorological data (temperature, wind conditions, solar radiation) and current values ​​at that location. For example, the first temperature calculation unit 330 calculates the temperature of the power transmission line 3 at a predetermined location by inputting the meteorological data (temperature, wind conditions, solar radiation) and current values ​​at that location into a first relational expression that represents the relationship between the current value, temperature, wind conditions, and solar radiation of the power transmission line 3 and the temperature of the power transmission line. This configuration makes it possible to calculate the temperature of the power transmission line 3 more accurately. This also makes it possible to operate the power transmission line 3 without leaving an excessive margin.

[0074] The first relation can be expressed, for example, by equations (1) to (7).

[0075] Wr + Ws - Ww - Wra = 0 …(1) Wr=I 2 ×R 20 ×{1+α(θ+T-20)} …(2) Ws = E × d × ε …(3) Ww = π × d × hw × θ …(4) Wra = π × d × hra × θ × ε …(5)

[0076]

number

[0077]

number

[0078] Wr: Joule heating due to electric current Ws: Heat radiation from sunlight Ww: Heat dissipation by convection Wra: Heat dissipation by radiation I: Predicted tidal current value (current value) (A) R 20 Resistance at 20°C (Ω / cm) α: Resistance temperature coefficient (Ω / ℃) θ: Temperature rise of the power transmission line (°C) T: Ambient temperature (air temperature) (°C) E: Illuminance (solar radiation) (W / cm 2 ) d: Diameter of the power transmission line (cm) ε: Emissivity of power transmission lines hw: Heat dissipation coefficient due to convection (W / ℃·cm) 2 ) v: Wind speed (m / s) hra: Heat dissipation coefficient due to radiation (Ω / ℃·cm) 2 ) The first temperature calculation unit 330A uses equations (1) to (7) along with ambient temperature (air temperature) T, wind speed v, solar radiation E, and the diameter d and resistance R of the power transmission line 3. 20 By inputting physical properties such as these, the temperature T+θ of the power transmission line 3 is calculated. This process is shown in Figures 11, 12 (A) to (D), and 13 (A).

[0079] Returning to Figure 7B, the second temperature calculation unit 330B calculates the temperature of the transmission line 3 at a predetermined location by inputting the sag at a predetermined location of the transmission line 3 into the second relational equation, which represents the relationship between the temperature and sag of the transmission line 3.

[0080] The sag of the power transmission line 3 at a predetermined position can be measured, for example, by measuring the degree of sag of the power transmission line 3 using a laser, and is acquired by the sag acquisition unit 380.

[0081] The second relation can be expressed, for example, by equations (8) and (9) below.

[0082]

number

[0083] Here, the meaning of each variable is as follows:

[0084] Dip: Slackness (m) m: Mass per meter of power transmission line (kg) g: Gravitational acceleration (m / s 2 ) L: Span length (m) Te: Tension in power transmission lines (N) The function f in equation (9) represents the relationship between the current temperature (T+θ) and tension (Te) of power transmission line 3, and can be determined by separate experiments, simulations, or theoretical calculations.

[0085] The second temperature calculation unit 330B calculates the current temperature T+θ of the transmission line 3 by inputting the sag Dip of the transmission line 3 along with physical properties such as the mass m and diameter L of the transmission line 3 into equations (8) and (9). This process is shown in Figure 13(B).

[0086] Alternatively, the second temperature calculation unit 330B may use equations (8)(9) and equation (10) below as second relational equations to calculate the current temperature T+θ of the power transmission line 3.

[0087] In other words, since transmission line 3 is also a chord, the sag Dip can be calculated using the following equation (10) by measuring the natural frequency f0 of transmission line 3.

[0088]

number

[0089] In this configuration, the sag can be calculated without using lasers or other means of measurement, making it possible to determine the sag safely.

[0090] To add to this, equation (10) can be generated from equations (8) and (11).

[0091]

number

[0092] Through the above-described configuration, it becomes possible to estimate the temperature of the power transmission line 3 from the sag of the power transmission line 3.

[0093] The temperature information output unit 340 outputs the temperature of the power transmission line 3 at a predetermined location on the power transmission line 3. For example, the temperature information output unit 340 displays the temperature of the power transmission line 3 as information representing the status of the power transmission line 3 on a monitor installed in a central power dispatch center or control center that manages the power system.

[0094] The power transmission line operation support device 300 may determine the temperature of power transmission line 3 using the temperature of power transmission line 3 calculated using the first relational expression (first temperature), or it may determine the temperature of power transmission line 3 using either the temperature of power transmission line 3 calculated using the first relational expression (first temperature) or the temperature of power transmission line 3 calculated using the second relational expression (second temperature), or both.

[0095] For example, the power transmission line operation support device 300 can adopt the higher of the first temperature and the second temperature as the temperature of the power transmission line 3. This configuration allows for the operation of the power transmission line 3 with a higher safety factor. Alternatively, the temperature of the power transmission line 3 calculated using the first relational equation may be adopted, while the temperature of the power transmission line 3 calculated using the second relational equation may be used as a reference value. This configuration makes it possible to verify the temperature of the power transmission line 3 calculated using the first relational equation with the temperature of the power transmission line 3 calculated using the second relational equation.

[0096] The current capacity calculation unit 350 calculates the current capacity at a predetermined location by inputting meteorological data (solar radiation, wind conditions, temperature) and the allowable temperature (first allowable temperature) specified for the transmission line 3 into the first relational expression.

[0097] The first permissible temperature is set so that the reduction in the mechanical strength of the power transmission line 3 does not exceed a specified value (for example, a reduction in tensile strength of 10%). For example, it is set at 90°C for ordinary aluminum power transmission line 3 (however, up to 120°C is permissible for short periods) and 150°C for heat-resistant aluminum power transmission line 3 (however, up to 180°C is permissible for short periods).

[0098] This configuration makes it possible to more accurately calculate the current capacity, which is the upper limit of the current value that can flow through the transmission line 3. This also makes it possible to operate the transmission line 3 without leaving any excessive margin.

[0099] The current information output unit 360 outputs the difference between the current value and the current capacity at a predetermined location on the transmission line 3. For example, the temperature information output unit 340 displays the difference between the current value and the current capacity as information representing the status of the transmission line 3 on a monitor installed in a central power dispatch center or control center that manages the power system. This configuration makes it possible to control supply and demand with high accuracy, for example, during periods of increased power demand in summer. The current information output unit 360 may also output the current value and current capacity at a predetermined location on the transmission line 3 individually.

[0100] The allowable temperature calculation unit 370 calculates the allowable temperature (second allowable temperature) of the transmission line 3 at a predetermined location by inputting an allowable value for the sag at a predetermined location of the transmission line 3 into a second relational expression that represents the relationship between the temperature and sag of the transmission line 3.

[0101] The allowable sag is determined, for example, to prevent the transmission line 3 from coming into contact with surrounding trees, buildings, etc. This configuration makes it possible to calculate the allowable temperature of the transmission line 3 from a different perspective than the first allowable temperature, which is determined based on the reduction in the mechanical strength of the transmission line 3. This allows for multifaceted protection of the transmission line 3 and enables safer operation of the transmission line 3.

[0102] In this case, the current capacity calculation unit 350 may calculate the current capacity at a predetermined location on the power transmission line 3 by inputting the smaller of the first allowable temperature and the second allowable temperature, and weather data at a predetermined location on the power transmission line 3, into the first relational expression. This configuration makes it possible to calculate a current capacity with higher safety.

[0103] Furthermore, if the allowable value for sag is specified for each span, the allowable temperature calculation unit 370 may calculate the allowable temperature (second allowable temperature) of the power transmission line 3 at the predetermined location by inputting the minimum value of each allowable value for sag into the second relational expression. In this configuration, a safer allowable temperature for the power transmission line 3 can be calculated.

[0104] The sag information output unit 390 outputs the difference between the sag at a predetermined position of the transmission line 3 and the allowable value of the sag at the predetermined position. For example, the sag information output unit 390 displays the difference between the current sag and the allowable value of the sag as information representing the status of the transmission line 3 on a monitor installed in a central power dispatch center or control center that manages the power system. This configuration makes it possible to more effectively prevent ground faults and short-circuits in the transmission line 3 that are likely to occur during high-temperature periods in summer, for example. Of course, the sag information output unit 390 may also output the sag and the allowable value at a predetermined position of the transmission line 3 separately.

[0105] The power transmission line operation support device 300 according to this embodiment, by having the above-described functions, can more accurately acquire wind conditions at a predetermined location on the power transmission line 3 and more accurately calculate the temperature of the power transmission line 3.

[0106] ==Processing Flow== Next, the processing flow of the power transmission line operation support device 300 according to this embodiment will be explained with reference to Figures 8 to 10.

[0107] Figure 8 is a flowchart showing the processing flow when the power transmission line operation support device 300 performs a process to calculate the temperature at a predetermined position (span) of the power transmission line 3 using the first relational equation.

[0108] First, the power transmission line operation support device 300 acquires weather data (S1000). The weather data includes temperature, solar radiation, and wind conditions. The power transmission line operation support device 300 also acquires wind conditions calculated by the wind condition information provision device 100.

[0109] The power transmission line operation support device 300 then acquires the current value of the power transmission line 3 (S1010) and the physical properties of the power transmission line 3 used in the first relational equation (S1020). The power transmission line operation support device 300 acquires these current values ​​and physical properties from tables (not shown) located in the main memory 302 or auxiliary memory 303, or from other computers (not shown) that are connected via communication.

[0110] The power transmission line operation support device 300 calculates the temperature of the power transmission line 3 by substituting the acquired data into the first relational expression (S1030). The power transmission line operation support device 300 then outputs the temperature of the power transmission line 3 (S1040).

[0111] This configuration makes it possible to more accurately obtain wind conditions at a predetermined location on the power transmission line 3 and to more accurately calculate the temperature of the power transmission line 3.

[0112] Next, Figure 9 is a flowchart showing the processing flow when the power transmission line operation support device 300 performs the process of calculating the difference between the current value and current capacity of the power transmission line 3 using the first relational equation.

[0113] First, the power transmission line operation support device 300 acquires weather data (S2000). The weather data includes temperature, solar radiation, and wind conditions. The wind conditions are obtained from values ​​calculated by the wind condition information provision device 100.

[0114] The power transmission line operation support device 300 then obtains the physical properties of the power transmission line 3 used in the first relational equation (S2010) and the allowable temperature of the power transmission line 3 (S2020). The power transmission line operation support device 300 obtains these allowable temperatures and physical properties from tables (not shown) located in the main memory 302 or auxiliary memory 303, or from other computers (not shown) that are connected via communication.

[0115] The power transmission line operation support device 300 calculates the current capacity of the power transmission line 3 by substituting the acquired data into the first relational expression (S2030). The power transmission line operation support device 300 then calculates and outputs the difference between the current value and the current capacity of the power transmission line 3 (S2040). Alternatively, the current value and current capacity of the power transmission line 3 may be output separately.

[0116] This configuration makes it possible to more accurately obtain wind conditions at a predetermined location along the power transmission line 3 and to more accurately calculate the current capacity of the power transmission line 3.

[0117] Figure 10 is a flowchart showing the processing flow when the power transmission line operation support device 300 performs a process to calculate the temperature at a predetermined position (span) of the power transmission line 3 using the second relational equation.

[0118] First, the power transmission line operation support device 300 acquires the sag of the power transmission line 3 (S3000). As described above, the sag can be measured directly using a laser, or it can be calculated using the measurement results of the natural frequency. Alternatively, the sag can be calculated by desk calculation using the overhead line tension data for each span and the ambient temperature stored in the power transmission line operation support device 300 as parameters.

[0119] The power transmission line operation support device 300 then acquires the physical properties of the power transmission line 3 used in the second relational equation (S3010).

[0120] The power transmission line operation support device 300 calculates the temperature of the power transmission line 3 by substituting the acquired sag and physical properties into the second relational equation (S3020). The power transmission line operation support device 300 then outputs the temperature of the power transmission line 3 (S3030).

[0121] In this configuration, it becomes possible to estimate the temperature of the power transmission line 3 from the sag of the power transmission line 3.

[0122] Furthermore, the power transmission line operation support device 300 can output the allowable temperature of the power transmission line 3 by obtaining the allowable sag value specified for the power transmission line 3 at S3000 in the flowchart shown in Figure 10 and executing the process up to S3030 (S3000~S3030).

[0123] This configuration makes it possible to calculate the allowable temperature of the transmission line 3 from a different perspective than the allowable temperature determined based on the reduction in mechanical strength of the transmission line 3.

[0124] Alternatively, the power transmission line operation support device 300 may calculate the current capacity of the power transmission line 3 by using the smaller of the allowable temperature calculated from the allowable value of the sag (second allowable temperature) and the allowable temperature determined based on the amount of mechanical strength reduction of the power transmission line 3 (first allowable temperature) as the allowable temperature, and performing information processing according to the flowchart shown in Figure 9. In this configuration, a current capacity with higher safety can be calculated.

[0125] The power transmission line operation support device 300 may also output the difference between the sag acquired in S3000 of Figure 10 and a separately defined allowable value for sag. For example, the power transmission line operation support device 300 displays the difference between the current sag and the allowable value for sag as information representing the status of the power transmission line 3 on a monitor installed in a central power dispatch center or control center that manages the power system. In this configuration, for example, during the daytime in summer, it becomes possible to notify operators early if the sag is increasing, and to effectively prevent ground faults and short circuits. Of course, the power transmission line operation support device 300 may also output the sag and the allowable value at a predetermined position on the power transmission line 3 individually.

[0126] The power transmission line operation support device 300 according to this embodiment can more accurately acquire wind conditions at a predetermined location on the power transmission line 3 and more accurately calculate the temperature of the power transmission line 3 by performing the above-described processing.

[0127] The power transmission line operation support device 300, the control method for the power transmission line operation support device 300, and the program according to this embodiment have been described above. According to this embodiment, it is possible to more accurately acquire wind conditions at a predetermined location on the power transmission line 3 and to more accurately calculate the temperature of the power transmission line 3.

[0128] In this embodiment, the predetermined location of the power transmission line 3 is defined as the span sandwiched between two adjacent power transmission towers 2. However, this predetermined location may be not limited to one (a specific single span) but may also be multiple (multiple spans). In the case of multiple spans, the power transmission line operation support device 300 performs the above-described information processing for each span. This makes it possible to grasp the state of the power transmission line 3, such as temperature and sag, for each span. In this case, individual values ​​for temperature, sag, physical properties, current values, and meteorological data of the power transmission line 3 are acquired or measured for each span. However, for the allowable temperature, current capacity, and sag of the power transmission line 3, it is preferable to use the minimum value among the respective values ​​for each span. This allows for the adoption of stricter standards, making it possible to operate the power transmission line 3 more safely.

[0129] The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. The present invention may be modified or improved without departing from its spirit, and equivalents thereof are also included.

[0130] For example, if the first relational expression described above includes meteorological data other than temperature, solar radiation, and wind speed (e.g., wind direction), the power transmission line operation support device 300 will also acquire this meteorological data (e.g., wind direction) and perform the information processing described above.

[0131] The power transmission line operation support device 300 may also obtain forecast values ​​of weather data for a future target time and forecast values ​​of the current flowing through the power transmission line 3 to predict the temperature of the power transmission line 3 at the target time. In this configuration, it becomes possible to grasp the temperature rise of the power transmission line 3 in advance and take countermeasures, thereby enabling safer operation of the power transmission line 3.

[0132] Similarly, the power transmission line operation support device 300 may obtain forecast values ​​of weather data for a future target time and the allowable temperature of the power transmission line 3 to predict the current capacity of the power transmission line 3 at the target time. In this configuration, it becomes possible to know the current capacity of the power transmission line 3 in advance and take countermeasures, thereby enabling safer operation of the power transmission line 3. [Explanation of symbols]

[0133] 2 Power transmission towers 3. Power transmission lines 4. Optical Fiber Composite Overhead Ground Wire (OPGW) 4a optical fiber 6 Substation 100 Wind condition information providing device 101 Processors 102 Main storage 103 Auxiliary storage device 104 Input device 105 Output device 106 Communication equipment 107 Optical Analysis Unit 110 Storage section 111 Vibration state at each measurement point 112 Statistical Models 113 Current wind conditions per span 114 Weather Information 115 Span-by-span difference prediction formula 116 Wind Condition Forecast Results for Each Span 120 Vibration state measurement unit 130 Wind condition acquisition section for each span 135 Weather Information Acquisition Department 140 Span-by-span difference prediction formula generation unit 145 Wind Condition Forecast Section for Each Span 150 Span-by-Span Current Wind Conditions Provided 155 Span-by-span wind condition forecast result provision section 300 Transmission line operation support equipment 301 Processor 302 Main storage 303 Auxiliary storage device 304 Input device 305 Output device 306 Communication equipment 310 Weather Data Acquisition Unit 320 Current Value Acquisition Unit 330A 1st temperature calculation section 330B 2nd temperature calculation section 340 Temperature Information Output Unit 350 Current capacity calculation section 360 Current Information Output Section 370 Allowable Temperature Calculation Unit 380 Slackness acquisition part 390 Slack Information Output Unit 500 Networks 1000 Power transmission line operation support system

Claims

1. A power transmission line operation support device that assists in the operation of power transmission lines installed on power transmission towers together with fiber optic composite overhead ground wires, A weather data acquisition unit that acquires predetermined types of weather data, including temperature, wind conditions, and solar radiation, at predetermined locations on the power transmission line, A current value acquisition unit that acquires the current value flowing through the predetermined position of the power transmission line, A first temperature calculation unit calculates the temperature of the transmission line at a predetermined location by inputting meteorological data and current values ​​at the predetermined location into a first relational equation that represents the relationship between the current value, temperature, wind conditions, and solar radiation of the transmission line and the temperature of the transmission line. A current capacity calculation unit calculates the current capacity at the predetermined location by inputting weather data at the predetermined location and a first allowable temperature specified for the power transmission line into the first relational expression, Equipped with, The aforementioned weather data acquisition unit is a power transmission line operation support device that acquires wind conditions calculated based on the measurement results of the vibration state of the optical fiber composite overhead ground wire, measured using a distributed multi-point vibration measurement method, as wind conditions at the predetermined location.

2. A power transmission line operation support device according to claim 1, A temperature information output unit that outputs the temperature of the power transmission line at the predetermined location, A power transmission line operation support device equipped with the following features.

3. A power transmission line operation support device according to Claim 1, A current information output unit that outputs the difference between the current value and the current capacity at the predetermined position, A power transmission line operation support device equipped with the following features.

4. A power transmission line operation support device according to Claim 1, The predetermined location of the transmission line is determined by the span, which is the section between two adjacent transmission towers. An allowable temperature calculation unit calculates a second allowable temperature of the transmission line at a predetermined location by inputting an allowable value for the sag at the predetermined location into a second relational expression that represents the relationship between the temperature and sag of the transmission line. Equipped with, The current capacity calculation unit calculates the current capacity at the predetermined location by inputting the smaller of the first allowable temperature and the second allowable temperature, and the weather data at the predetermined location into the first relational expression, thereby providing a power transmission line operation support device.

5. A power transmission line operation support device according to claim 1, The predetermined location of the transmission line is determined by the span, which is the section between two adjacent transmission towers. A sag acquisition unit that acquires the sag at the predetermined position of the power transmission line, A second temperature calculation unit calculates the temperature of the transmission line at a predetermined location by inputting the sag at the predetermined location of the transmission line into a second relational equation that represents the relationship between the temperature and sag of the transmission line, A power transmission line operation support device equipped with the following features.

6. A power transmission line operation support device according to Claim 5, A sag information output unit that outputs the difference between the sag at the predetermined position of the power transmission line and the allowable value of the sag at the predetermined position, A power transmission line operation support device equipped with the following features.

7. A power transmission line operation support device according to claim 1, The predetermined position of the power transmission line is determined for each span, which is the section between two adjacent power transmission towers, in a power transmission line operation support device.

8. A power transmission line operation support device according to claim 1, The weather data acquisition unit acquires the predicted values ​​of the weather data at the time of prediction for predicting the temperature of the power transmission line, The current value acquisition unit acquires the predicted value of the current value at the target time point, The first temperature calculation unit calculates the predicted temperature of the power transmission line at the time of the prediction target at the predetermined location by inputting the predicted values ​​of the weather data and the predicted values ​​of the current into the first relational expression, and is a power transmission line operation support device.

9. A power transmission line operation support device according to Claim 1, The weather data acquisition unit acquires the predicted values ​​of the weather data at the time of prediction for predicting the current capacity of the power transmission line. The current capacity calculation unit calculates a predicted value of the current capacity at the target time at the predetermined location by inputting the predicted value of the weather data and the first allowable temperature into the first relational expression, and is a power transmission line operation support device.

10. A control method for a power transmission line operation support device that supports the operation of power transmission lines installed on power transmission towers together with fiber optic composite overhead ground wires, The aforementioned power transmission line operation support device, Obtain predetermined types of meteorological data at predetermined locations on the power transmission line, including temperature, solar radiation, and wind conditions calculated based on the measurement results of the vibration state of the optical fiber composite overhead ground wire measured using a distributed multi-point vibration measurement method. The current value flowing through the predetermined position of the power transmission line is obtained, By inputting the meteorological data and current values ​​at the predetermined location into the first relational equation, which represents the relationship between the current value, temperature, wind conditions, and solar radiation of the power transmission line and the temperature of the power transmission line, the temperature of the power transmission line at the predetermined location is calculated. By inputting weather data at the predetermined location and the first allowable temperature specified for the power transmission line into the first relational expression, the current capacity at the predetermined location is calculated. A control method for a power transmission line operation support device.

11. A computer to support the operation of power transmission lines installed on transmission towers along with fiber optic composite overhead ground wires, A procedure for acquiring predetermined types of meteorological data at predetermined locations on a power transmission line, including temperature, solar radiation, and wind conditions calculated based on measurement results of the vibration state of the optical fiber composite overhead ground wire measured using a distributed multi-point vibration measurement method, A procedure for obtaining the current value flowing through the predetermined position of the power transmission line, A procedure for calculating the temperature of a transmission line at a predetermined location by inputting meteorological data and current values ​​at the predetermined location into a first relational equation that represents the relationship between the current value, temperature, wind conditions, and solar radiation of the transmission line and the temperature of the transmission line, A procedure for calculating the current capacity at a predetermined location by inputting weather data at the predetermined location and a first allowable temperature specified for the power transmission line into the first relational equation, A program to execute.

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