CN112054465B - OPGW ice melting system - Google Patents
OPGW ice melting system Download PDFInfo
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- CN112054465B CN112054465B CN202010708794.2A CN202010708794A CN112054465B CN 112054465 B CN112054465 B CN 112054465B CN 202010708794 A CN202010708794 A CN 202010708794A CN 112054465 B CN112054465 B CN 112054465B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
The invention relates to an OPGW ice melting system, which comprises an environment monitoring module, a margin determining module and a current determining module; the environment monitoring module is used for monitoring environmental conditions; the margin determining module is used for determining ice melting current margin calculation measures according to the environmental conditions monitored by the environmental monitoring module; the current determining module is used for determining the ice melting current according to the environmental conditions monitored by the environmental monitoring module and the ice melting current margin calculation measures determined by the margin determining module. The invention can reasonably determine the ice melting current of the OPGW to melt the ice on the OPGW more efficiently and reliably, thereby not only avoiding the damage of the ice to the OPGW and the related electric power facilities connected with the OPGW, but also reducing the service life loss of the OPGW when the ice melting is carried out by applying the ice melting current to the OPGW.
Description
Technical Field
The invention relates to the technical field of ice melting of electric power facilities, in particular to an OPGW (optical fiber composite overhead ground wire) ice melting system.
Background
The main function of the Ground Wire of the Overhead high-voltage power transmission line is lightning protection, if an Optical Fiber is placed in the Ground Wire of the Overhead high-voltage power transmission line to form an Optical Fiber communication network on the power transmission line, the Ground Wire has both lightning protection and communication functions, and the structural form of combining the Overhead Ground Wire and the Optical cable into a whole is called as an OPGW (Optical Fiber Composite Overhead Ground Wire). The OPGW is not current carrying under normal operation and the ice coating thickness of the OPGW will be greater under the same environmental conditions relative to other current carrying conductors in the overhead high voltage transmission line. Furthermore, the mechanical length of the OPGW is typically low relative to other conductors in the overhead high voltage transmission line. When the thickness of the ice coating on the OPGW reaches a certain degree, the OPGW and the related electric facilities connected with the OPGW are easily damaged, which threatens the reliability and stability of the power supply of the power grid.
The direct current ice melting technology is an ice melting method widely applied to an overhead high-voltage transmission line, and the ice melting is carried out by applying direct current voltage to an OPGW and carrying out short circuit at the tail end of the transmission line to heat the OPGW. However, the determination of the ice-melting current is influenced by environmental conditions, the ice coating cannot be timely melted by the excessively low ice-melting current, and the aging of the optical fiber coating is accelerated by the excessively high current, so that the OPGW ice-melting current needs to be reasonably determined to perform more efficient and reliable OPGW ice melting.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned drawbacks (shortcomings) of the prior art, and providing an OPGW ice melting system for solving the problem of how to reasonably determine an OPGW ice melting current.
The technical scheme adopted by the invention is as follows:
an OPGW ice melting system comprises an environment monitoring module, a margin determining module and a current determining module; an environmental monitoring module for monitoring environmental conditions; the margin determining module is used for determining ice melting current margin calculation measures according to the environmental conditions monitored by the environmental monitoring module; and the current determining module is used for determining the ice melting current according to the environmental conditions monitored by the environmental monitoring module and the ice melting current margin calculation measures determined by the margin determining module.
Through the margin determining module, the margin which needs to be applied by the current determining module when the ice-melting current of the OPGW is determined according to the environmental condition monitored by the environmental monitoring module, so that the margin design of the ice-melting current can be more fit with the current environmental condition, the change of the current environmental condition can be more flexibly adapted, and the more reasonable ice-melting current can be finally determined.
Further, the environment monitoring module comprises an ice coating thickness monitor for monitoring the ice coating thickness b and/or a wind speed sensor for monitoring the wind speed v and/or a temperature sensor for monitoring the environment temperature T1 and the lead wire temperature T2; the margin determination module comprises an ice thickness margin determination unit and/or a wind speed margin determination unit and/or a temperature margin determination unit; the ice thickness margin determining unit is used for determining ice melting current margin calculation measures corresponding to the ice thickness according to the ice thickness b; the wind speed margin determining unit is used for determining ice melting current margin calculation measures corresponding to the wind speed according to the wind speed v; the temperature margin determining unit is used for determining ice melting current margin calculation measures corresponding to the temperature according to the environment temperature T1 and the lead temperature T2; and the current determining module is specifically used for determining the ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1, the lead temperature T2 and ice-melting current margin calculation measures corresponding to the ice-coating thickness and/or the wind speed and/or the temperature.
The ice melting current margin can be determined according to the currently monitored ice coating thickness b, the currently monitored wind speed v, the currently monitored ambient temperature T1 and the currently monitored lead temperature T2 in a targeted manner by the ice thickness margin determination unit, the wind speed margin determination unit and the temperature margin determination unit, so that the ice melting current margin is determined more reasonably and finely.
Further, the ice thickness margin determining unit is configured to determine a calculation measure of an ice melting current margin corresponding to the ice coating thickness according to the ice coating thickness b, and specifically includes: when the icing thickness b exceeds a preset first ice thickness threshold value b1, determining an ice-melting current margin calculation measure corresponding to the icing thickness as increasing the icing thickness b when determining the ice-melting current; the current determining module is used for determining the ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1, the lead temperature T2 and ice-melting current margin calculation measures corresponding to the ice-coating thickness, and specifically comprises the following steps: when the ice coating thickness b does not exceed a preset first ice thickness threshold value b1, determining that the ice melting current is 0A; and when the icing thickness b exceeds a preset first ice thickness threshold b1, performing ice-melting current margin calculation measures determined by the ice thickness margin determination unit, and determining ice-melting current according to the increased icing thickness b and wind speed v, the ambient temperature T1 and the wire temperature T2.
When the icing thickness b exceeds a first icing thickness threshold b1, the ice-melting current is calculated according to the increased ice-melting thickness b, so that the calculated ice-melting current is larger than the calculated ice-melting current before the ice-melting thickness b is increased, ice can be efficiently melted when the OPGW is started to melt ice, and the icing can be completely melted.
Further, the step of increasing the ice coating thickness b by the ice thickness margin determination unit specifically includes: the icing is increased to a preset second ice thickness threshold b 2.
Further, the first ice thickness threshold b1 is 3mm to 6mm, and the second ice thickness threshold b2 is 8mm to 12 mm.
Further, the wind speed margin determination unit is configured to determine a step of calculating a deicing current margin corresponding to the wind speed according to the wind speed v, and specifically includes: when the wind speed v is within a preset wind speed range v 1-v 2, determining ice-melting current margin calculation measures corresponding to the wind speed to increase the determined ice-melting current when the ice-melting current is determined; the current determining module is used for determining the ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1, the lead temperature T2 and ice-melting current margin calculation measures corresponding to the wind speed, and specifically comprises the following steps: when the wind speed v is not within a preset wind speed range v 1-v 2, determining ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1 and the lead temperature T2; and when the wind speed v is within a preset wind speed range v 1-v 2, determining the ice-melting current according to the ice coating thickness b, the wind speed v, the environment temperature T1 and the wire temperature T2, executing the ice-melting current margin calculation measure determined by the wind speed margin determination unit, and increasing the determined ice-melting current so as to finally determine the ice-melting current.
When the wind speed v is within the wind speed range v 1-v 2, the determined ice-melting current is increased again, so that the finally calculated ice-melting current is larger, the high sensitivity of the ice-melting current change when the wind speed v is within the wind speed range v 1-v 2 is fully considered, when the wind speed v is within the wind speed range v 1-v 2, enough ice-melting current can be basically ensured to melt ice by the OPGW, and the hysteresis existing in the process of monitoring the wind speed v in real time and then adjusting the ice-melting current according to the wind speed v monitored in real time is compensated.
Further, the wind speed range v 1-v 2 is 0 m/s-2 m/s.
Further, the wind speed margin determination unit is configured to determine that the ice-melting current margin calculation measure corresponding to the wind speed is a step of increasing the determined ice-melting current when determining the ice-melting current, and specifically includes: and determining the ice-melting current margin corresponding to the wind speed by taking the calculation measure that the determined ice-melting current is increased by a preset current increase value delta I1 when the ice-melting current is determined, wherein delta I1 is 30-60A.
Further, the temperature margin determination unit is configured to determine a step of calculating a ice melting current margin corresponding to the temperature according to the ambient temperature T1 and the lead temperature T2, specifically: calculating the temperature difference delta T between the temperature T2 of the lead and the ambient temperature T1, and when the temperature difference delta T is larger than 0, determining the ice-melting current margin calculation measure corresponding to the temperature to increase the determined ice-melting current when the ice-melting current is determined; the current determining module is used for determining the ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1, the lead temperature T2 and ice-melting current margin calculation measures corresponding to the temperature, and specifically comprises the following steps: and determining the ice melting current according to the ice coating thickness b, the wind speed v, the environment temperature T1 and the wire temperature T2, executing the ice melting current margin calculation measure determined by the temperature margin determination unit, and increasing the determined ice melting current to finally determine the ice melting current.
When the temperature difference delta T is larger than 0, the determined ice melting current is increased again, the finally calculated ice melting current can be larger, the high sensitivity of the change of the ice melting current when the temperature difference delta T changes is fully considered, when the temperature difference delta T changes, enough ice melting current can be basically guaranteed to carry out OPGW ice melting, and the hysteresis existing in the process of monitoring the lead temperature T2 and the environment temperature T1 in real time, calculating the temperature difference delta T according to the lead temperature T2 and the environment temperature T1 which are monitored in real time and then adjusting the ice melting current is solved.
Further, the temperature margin determination unit is configured to determine that the ice-melting current margin calculation measure corresponding to the temperature is a step of increasing the determined ice-melting current when determining the ice-melting current, and specifically includes: determining ice-melting current margin calculation measures corresponding to the temperature, namely increasing the determined ice-melting current by T times through a preset current increase value delta I2 when the temperature difference delta T is T ℃ and T is larger than 0; the preset current increase value delta I2 is 13A-20A.
Compared with the prior art, the invention has the beneficial effects that: the design of the OPGW ice-melting current margin is carried out by the margin determining module according to the environmental conditions monitored by the environmental monitoring module in real time, the adverse effect of the environmental conditions on the ice-melting current can be fully considered by the designed ice-melting current margin, the ice-melting current calculated by the current determining module after the ice-melting current margin is considered is more reasonable, and therefore ice coating on the OPGW is melted more efficiently and reliably, damage of the ice coating on the OPGW and relevant electric power facilities connected with the OPGW is avoided, and the service life loss of the OPGW when the ice-melting current is applied to the OPGW for ice melting is reduced.
Drawings
Fig. 1 is an OPGW ice melting system according to an embodiment of the present invention.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1, this embodiment provides an OPGW ice melting system, which may be built in a dc ice melting device or externally installed in a control device of the dc ice melting device, and is configured to control an ice melting current applied to an OPGW by the dc ice melting device, where the OPGW ice melting system includes an environment monitoring module 10, a margin determining module 20, and a current determining module 30.
The environment monitoring module 10 is configured to monitor an environmental condition, specifically, one or more environmental conditions affecting the melting of the OPGW; the margin determining module 20 is configured to determine an ice melting current margin calculation measure according to the environmental condition monitored by the environmental monitoring module 10; the current determining module 30 is configured to determine the ice-melting current according to the environmental condition monitored by the environment monitoring module 10 and the ice-melting current margin calculation measure determined by the margin determining module 20.
The environmental conditions are manually uncontrollable, the influence of the current environmental conditions on the melting ice of the OPGW can be judged and the possible influence of the future environmental conditions on the melting ice of the OPGW can be predicted only by monitoring the environmental conditions in real time, and meanwhile, some environmental conditions which cannot be monitored in a specific mode are empirically assumed, so that the currently required melting ice current of the OPGW is determined. In addition, the environmental condition is in a dynamic change process, and the magnitude of the ice melting current of the OPGW is adjusted according to the real-time monitored environmental condition, so that certain hysteresis exists. The icing on the OPGW threatens the OPGW and the related power facilities connected to the OPGW at the moment, and the icing on the OPGW needs to be timely and effectively melted, so that a certain margin needs to be considered when calculating the ice melting current of the OPGW. However, the applied margin cannot be too large, so that the service life of the OPGW is prevented from being affected by too large ice-melting current, the applied margin cannot be too small, and otherwise the uncontrollable property of the environmental conditions and the hysteresis property of the ice-melting current adjustment cannot be compensated.
In this embodiment, the margin determining module 20 determines, according to the environmental condition monitored by the environmental monitoring module 10, the margin that the current determining module 30 needs to apply when determining the ice-melting current of the OPGW, so that the margin design of the ice-melting current can be more suitable for the current environmental condition, and more flexibly adapt to the change of the current environmental condition, thereby finally determining a more reasonable ice-melting current.
The environmental conditions closely related to the determination of the ice melting current of the OPGW are mainly the ice coating thickness b of the OPGW, the wind speed v experienced by the OPGW, the ambient temperature T1 where the OPGW is located, and the wire temperature T2 of the OPGW. The environment monitoring module 10 may comprise an ice thickness monitor 11 for monitoring the ice thickness b and/or a wind speed sensor 12 for monitoring the wind speed v and/or a temperature sensor 13 for monitoring the ambient temperature T1, the wire temperature T2.
Specifically, the temperature sensor 13 includes an ambient temperature sensor disposed outdoors which can monitor the ambient temperature T1 and an optical fiber temperature sensor disposed on the OPGW which can monitor the wire temperature T2 of the OPGW.
Accordingly, the margin determination module 20 may comprise an ice thickness margin determination unit 21 and/or a wind speed margin determination unit 22 and/or a temperature margin determination unit 23. The ice thickness margin determining unit 21 is configured to determine an ice melting current margin calculation measure corresponding to the ice thickness according to the ice thickness b; the wind speed margin determination unit 22 is used for determining a deicing current margin calculation measure corresponding to the wind speed according to the wind speed v; the temperature margin determination unit 23 is used for determining the ice melting current margin calculation measure corresponding to the temperature according to the environment temperature T1 and the lead temperature T2.
The current determining module 30 may determine the ice-melting current according to the ice-coating thickness b, the wind speed v, the ambient temperature T1 and the wire temperature T2 respectively and correspondingly monitored by the ice-coating thickness monitor 11, the wind speed sensor 12 and the temperature sensor 13, and the ice-melting current margin calculation measure corresponding to the ice-coating thickness and/or the wind speed and/or the temperature determined respectively by the ice-coating thickness determining unit 21 and/or the wind speed margin determining unit 22 and/or the temperature margin determining unit 23.
At present, a plurality of formulas for calculating the melting current of the OPGW by considering various environmental conditions are provided for melting the ice of the OPGW, and the environmental conditions considered are complete as shown in the following formula (1), specifically as follows:
in the formula (1), ImelFor ice melting current, Δ T is the difference between the wire temperature T2 and the ambient temperature T1, d is the OPGW diameterD is the diameter of the ice cylinder, lambda is the coefficient of thermal conductivity, g0Is the specific gravity of ice, R0Is the resistivity, t, of the OPGW at 0 DEG CrTo ice melting time, RT0For equivalent disease course conduction thermal resistance, RT1Equivalent thermal resistance to convection and radiation.
In an optional implementation manner, the current determining module 30 may first calculate the ice-melting current according to an existing formula for calculating the ice-melting current of the OPGW, such as the above formula (1), according to the environmental condition monitored in real time, and then perform an ice-melting current margin calculation measure corresponding to the ice-coating thickness and/or the wind speed and/or the temperature on the calculated ice-melting current, so as to finally obtain the ice-melting current with the margin taken into consideration.
In another optional implementation, the current determining module 30 may adjust values of a plurality of parameters in the calculation formula according to an existing formula for calculating the ice melting current of the OPGW, such as the above formula (1), in a process of calculating the ice melting current according to the environment condition monitored in real time by applying the calculation formula, according to ice coating thickness and/or ice melting current margin calculation measures corresponding to wind speed and/or temperature, so as to obtain the ice melting current with the margin taken into consideration.
The ice-melting current margin can be determined in a targeted manner according to the currently monitored ice coating thickness b, the currently monitored wind speed v, the currently monitored environmental temperature T1 and the currently monitored lead temperature T2 through the ice thickness margin determining unit 21, the wind speed margin determining unit 22 and the temperature margin determining unit 23, so that the determination of the ice-melting current margin is more reasonable and refined.
For the influence of the icing thickness on the ice melting of the OPGW, when the icing thickness b does not exceed a certain threshold value, the icing on the OPGW cannot damage the OPGW and the electric power facilities connected with the OPGW, at the moment, ice melting measures can not be taken for the OPGW, and the direct-current ice melting device is controlled not to apply direct-current voltage to the OPGW. When the icing thickness b exceeds a certain threshold value, the direct-current deicing device is controlled to start applying direct-current voltage to the OPGW, if the icing current is calculated by adopting the icing thickness b, the calculated deicing current cannot completely melt the icing with the icing thickness b, and the melting can be started only when the icing is thicker, so that the OPGW is started to melt ice, and meanwhile, a deicing current margin calculation measure corresponding to the icing thickness is also required to be adopted, so that the deicing current has a certain margin.
Specifically, a first ice thickness threshold b1 is preset, and when the ice coating thickness b does not exceed the first ice thickness threshold b1, the current determining module 30 determines that the ice-melting current is 0A, so that the dc ice-melting device does not apply a dc voltage to the OPGW. When the icing thickness b exceeds the first icing thickness threshold b1, the ice thickness margin determining unit 21 determines that the ice melting current margin calculation measure corresponding to the icing thickness is that when the ice melting current is determined, the icing thickness b is increased, when the ice melting current is determined by the current determining module 30, the ice melting current margin calculation measure determined by the ice thickness margin determining unit 21 is executed, the icing thickness b is increased, and the ice melting current is determined according to the increased icing thickness b, the increased wind speed v, the ambient temperature T1 and the wire temperature T2.
When the icing thickness b exceeds a first icing thickness threshold b1, the ice-melting current is calculated according to the increased ice-melting thickness b, so that the calculated ice-melting current is larger than the calculated ice-melting current before the ice-melting thickness b is increased, ice can be efficiently melted when the OPGW is started to melt ice, and the icing can be completely melted.
The ice coating thickness b may be increased to a preset second ice coating threshold b2, or may be increased by a preset ice coating thickness increase Δ b.
The first ice thickness threshold b1 is preferably 3mm to 6mm, for example, 3.5mm for b1, 5mm for b1, and 3.82mm for b1, and 3mm to 6mm is an ice coating thickness that the OPGW can generally endure. The second ice thickness threshold b2 is preferably 8mm to 12mm, which neither makes the ice melting current margin too large nor too small, such as b 2-8.2 mm, b 2-10 mm, b 2-11.57 mm, etc. The value of the second ice thickness threshold b2 is 8-12 mm. The ice coating thickness increase value Δ b is preferably 4mm to 6mm, and neither the ice melting current margin is too large nor too small, for example, Δ b ═ 4.5mm, Δ b ═ 5.78mm, and the like.
For example, the first ice thickness threshold b1 is 5mm, and the second ice thickness threshold b2 is 10 mm. When the ice coating thickness b does not exceed 5mm, the current determining module 30 determines that the ice melting current is 0A,and controlling the direct-current deicing device not to apply direct-current voltage to the OPGW. When the icing thickness b exceeds 5mm, the ice thickness margin determination unit 21 determines that the ice melting current margin calculation measure is to increase the icing thickness b to 10mm when determining the ice melting current, when calculating the ice melting current by using the formula (1), the icing thickness b is taken as 10mm, the wind speed v, the difference delta T between the lead temperature T2 and the ambient temperature T1 are taken as values according to actually monitored data, and the values are substituted into the formula (1) to finally calculate the ice melting current Imel。
For the influence of the wind speed on the ice melting of the OPGW, when the wind speed is in a certain specific range, the change of the wind speed has a large influence on the ice melting current required by the ice melting of the OPGW, the wind speed is increased a little in the specific range, and the ice melting current needs to be increased a lot. When the wind speed is not in a certain specific range, the change of the wind speed has small influence on the ice-melting current required by the OPGW for melting ice, the wind speed changes outside the specific range, and the change of the ice-melting current is smooth. Therefore, when the wind speed is in the specific range, the ice-melting current required by the OPGW for ice melting is very sensitive to the wind speed, and at this time, the ice-melting current margin calculation corresponding to the wind speed needs to be adopted, so that the ice-melting current has a certain margin.
Specifically, a wind speed range v 1-v 2 is preset, and when the wind speed v is not within the wind speed range v 1-v 2, the current determining module 30 determines the ice melting current directly according to the real-time monitored ice coating thickness b, the wind speed v, the ambient temperature T1 and the lead temperature T2. When the wind speed v is within the wind speed range v 1-v 2, the wind speed margin determination unit 22 determines that the ice-melting current margin calculation measure corresponding to the wind speed is that when the ice-melting current is determined, the determined ice-melting current is increased, the current determination module 30 determines the ice-melting current according to the ice-coating thickness b, the wind speed v, the ambient temperature T1 and the wire temperature T2 which are monitored in real time, and then executes the ice-melting current margin calculation measure determined by the wind speed margin determination unit 22 to increase the determined ice-melting current so as to finally determine the ice-melting current.
When the wind speed v is within the wind speed range v 1-v 2, the determined ice-melting current is increased again, so that the finally calculated ice-melting current is larger, the high sensitivity of the ice-melting current change when the wind speed v is within the wind speed range v 1-v 2 is fully considered, when the wind speed v is within the wind speed range v 1-v 2, enough ice-melting current can be basically ensured to melt ice by the OPGW, and the hysteresis existing in the process of monitoring the wind speed v in real time and then adjusting the ice-melting current according to the wind speed v monitored in real time is compensated.
The wind speed range v 1-v 2 is preferably 0 m/s-2 m/s, when the wind speed v is 0 m/s-2 m/s, the influence on the ice-melting current is large, the ice-melting current required by the wind speed v of 2m/s is increased by 18A-48A compared with the ice-melting current required by the wind speed v of 0m/s, and when the wind speed is more than 2m/s, the ice-melting current is only increased by 2-8A when the wind speed is increased by 2 m/s. Therefore, when the wind speed v is 0m/s to 2m/s, the wind speed margin determination unit 22 is required to determine the ice-melting current margin calculation measure corresponding to the wind speed and the current determination unit is required to execute the ice-melting current margin calculation measure corresponding to the wind speed.
According to the rule of influence of the wind speed v on the ice-melting current, the wind speed margin determining unit 22 may determine the ice-melting current margin corresponding to the wind speed by increasing the determined ice-melting current by a preset current increase value Δ I1 when determining the ice-melting current, where the current increase value Δ I1 is preferably 30A to 60A, such as Δ I1 ═ 35A, Δ I1 ═ 48A, and Δ I1 ═ 52.2A.
Take the current increase Δ I1 ═ 30A as an example. When the wind speed v is not in the wind speed range v 1-v 2, the current determining module 30 determines the ice melting current directly according to the real-time monitored ice coating thickness b, the wind speed v, the environment temperature T1 and the wire temperature T2, and controls the direct-current ice melting device to apply direct-current voltage to the OPGW according to the determined ice melting current. When the wind speed v is within the wind speed range v 1-v 2, the wind speed margin determination unit 22 determines that the ice-melting current margin calculation measure corresponding to the wind speed is that when the ice-melting current is determined, the determined ice-melting current is increased by 30A, and the current determination module 30 calculates the ice-melting current I by using the formula (1) according to the real-time monitored ice-coating thickness b, the wind speed v, the ambient temperature T1 and the lead temperature T2melThen, the ice-melting current margin calculation measure determined by the wind speed margin determination unit 22 is executed, and the calculated ice-melting current I is calculatedmelIncreasing by 30A, and finally determining the ice melting current as Imel+30A。
For the influence of temperature on the ice melting of the OPGW, the temperature difference Δ T between the wire temperature T2 and the ambient temperature T1 has a large influence on the ice melting current required by the ice melting of the OPGW, the ice melting current required by the ice melting of the OPGW is also sensitive to the ambient condition of the temperature difference Δ T, and when the temperature difference Δ T changes, the change of the ice melting current is large, so that the ice melting current has a certain margin due to calculation of the ice melting current margin corresponding to the temperature.
Specifically, the temperature margin determining unit 23 calculates a temperature difference Δ T between the temperature difference wire temperature T2 and the ambient temperature T1 to be T2-T1 according to the wire temperature T2 and the ambient temperature T1 monitored in real time, when the temperature difference Δ T is greater than 0 ℃, it is determined that the ice-melting current margin calculating measure corresponding to the temperature is to increase the determined ice-melting current when determining the ice-melting current, the current determining module 30 determines the ice-melting current according to the ice-coating thickness b, the wind speed v, the ambient temperature T1 and the wire temperature T2 monitored in real time, and then executes the ice-melting current margin calculating measure determined by the temperature margin determining unit 23 to increase the determined ice-melting current to finally determine the ice-melting current.
When the temperature difference delta T is larger than 0, the determined ice melting current is increased again, the finally calculated ice melting current can be larger, the high sensitivity of the change of the ice melting current when the temperature difference delta T changes is fully considered, when the temperature difference delta T changes, enough ice melting current can be basically guaranteed to carry out OPGW ice melting, and the hysteresis existing in the process of monitoring the lead temperature T2 and the environment temperature T1 in real time, calculating the temperature difference delta T according to the lead temperature T2 and the environment temperature T1 which are monitored in real time and then adjusting the ice melting current is solved.
When the temperature difference delta T rises by 1 ℃, the ice-melting current needs to be increased by 14A-19A, so that the temperature margin determining unit 23 is needed to determine the ice-melting current margin calculation measure corresponding to the temperature and the current determining unit is enabled to execute the ice-melting current margin calculation measure corresponding to the temperature.
According to the rule of the influence of the temperature difference Δ T on the ice-melting current, the ice-melting current margin calculation measure corresponding to the wind speed determined by the temperature margin determination unit 23 may be a preset current increase value Δ I2 for increasing the determined ice-melting current by T times when the temperature difference Δ T is T ℃ and T is greater than 0 when the ice-melting current is determined, where the current increase value Δ I2 is preferably 13A to 20A, such as Δ I2 ═ 15A, Δ I2 ═ 17.8A, and Δ I2 ═ 19.25A.
Take the current increase Δ I2 ═ 15A as an example. The temperature margin determination unit 23 determines the ice-melting current margin calculation measure corresponding to the wind speed by increasing the determined ice-melting current by 15A times T when the temperature difference delta T is T ℃ and the ice-melting current is determined, and the current determination module 30 calculates the ice-melting current I by using the formula (1) according to the real-time monitored ice coating thickness b, the wind speed v, the ambient temperature T1 and the lead temperature T2melThen, the ice-melting current margin calculation measure determined by the temperature margin determination unit 23 is executed, and the calculated ice-melting current I is calculatedmelIncreasing the tA by 15tA and finally determining the ice melting current as Imel+15tA。
It can be understood that the ice-melting current margin calculation measure corresponding to the ice coating thickness, the ice-melting current margin calculation measure corresponding to the wind speed, and the ice-melting current margin calculation measure corresponding to the temperature may be taken three at the same time, may be taken singly, or may be taken only two of them. When a plurality of ice-melting current margin calculation measures are taken simultaneously, the ice-melting current may be obtained by sequentially executing the ice-melting current margin calculation measures, the ice-melting current may be obtained by sequentially reducing the ice-melting current margin calculation measures, or the ice-melting current may be obtained by sequentially executing the ice-melting current margin calculation measures and then comprehensively reducing the ice-melting current margin calculation measures, which is not specifically limited in this embodiment.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (8)
1. An OPGW ice melting system is characterized by comprising an environment monitoring module, a margin determining module and a current determining module;
the environment monitoring module is used for monitoring environmental conditions;
the margin determining module is used for determining ice melting current margin calculation measures according to the environmental conditions monitored by the environmental monitoring module;
the current determining module is used for determining the ice melting current according to the environmental conditions monitored by the environmental monitoring module and the ice melting current margin calculation measures determined by the margin determining module;
the environment monitoring module comprises an ice coating thickness monitor for monitoring ice coating thickness b and/or a wind speed sensor for monitoring wind speed v and/or a temperature sensor for monitoring environment temperature T1 and lead wire temperature T2; the margin determination module comprises an ice thickness margin determination unit and/or a wind speed margin determination unit and/or a temperature margin determination unit;
the ice thickness margin determining unit is used for determining ice melting current margin calculation measures corresponding to the ice thickness according to the ice thickness b;
the wind speed margin determining unit is used for determining ice melting current margin calculation measures corresponding to the wind speed according to the wind speed v;
the temperature margin determining unit is used for determining ice melting current margin calculation measures corresponding to the temperatures according to the environment temperature T1 and the lead temperature T2;
the current determining module is specifically configured to determine the ice-melting current according to the ice-coating thickness b, the wind speed v, the ambient temperature T1, the lead temperature T2, and ice-melting current margin calculation measures corresponding to the ice-coating thickness and/or the wind speed and/or the temperature;
the ice thickness margin determination unit is used for determining the ice melting current margin calculation measure corresponding to the ice thickness according to the ice thickness b, and specifically comprises the following steps:
when the icing thickness b exceeds a preset first ice thickness threshold value b1, determining an ice-melting current margin calculation measure corresponding to the icing thickness as that the icing thickness b is increased when the ice-melting current is determined;
the current determining module is configured to determine the ice-melting current according to the ice-coating thickness b, the wind speed v, the ambient temperature T1, the lead temperature T2, and ice-melting current margin calculation measures corresponding to the ice-coating thickness, and specifically includes:
when the ice coating thickness b does not exceed a preset first ice thickness threshold value b1, determining that the ice melting current is 0A; and when the ice coating thickness b exceeds a preset first ice coating threshold b1, executing ice melting current margin calculation measures determined by the ice coating margin determination unit, and determining ice melting current according to the increased ice coating thickness b and wind speed v, the environmental temperature T1 and the wire temperature T2.
2. The OPGW ice melting system according to claim 1, wherein the step of increasing the ice thickness b by the ice thickness margin determining unit is specifically: the icing is increased to a preset second ice thickness threshold b 2.
3. The OPGW ice melting system of claim 2, wherein the first ice thickness threshold b1 is 3mm, and the second ice thickness threshold b2 is 8 mm.
4. The OPGW ice-melting system according to claim 1, wherein the wind speed margin determining unit is configured to determine, according to the wind speed v, a step of a calculation measure of an ice-melting current margin corresponding to the wind speed, specifically:
when the wind speed v is within a preset wind speed range v 1-v 2, determining ice-melting current margin calculation measures corresponding to the wind speed to increase the determined ice-melting current when the ice-melting current is determined;
the current determining module is used for determining the ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1, the lead temperature T2 and ice-melting current margin calculation measures corresponding to the wind speed, and specifically comprises the following steps:
when the wind speed v is not in a preset wind speed range v 1-v 2, determining ice melting current according to the ice coating thickness b, the wind speed v, the environment temperature T1 and the lead temperature T2;
when the wind speed v is within a preset wind speed range v 1-v 2, determining ice-melting current according to the ice coating thickness b, the wind speed v, the environment temperature T1 and the wire temperature T2, executing ice-melting current margin calculation measures determined by the wind speed margin determination unit, and increasing the determined ice-melting current to finally determine the ice-melting current.
5. The OPGW ice melting system as claimed in claim 4, wherein the wind speed range v 1-v 2 is 0 m/s-2 m/s.
6. The OPGW ice-melting system according to claim 4, wherein the wind speed margin determination unit is configured to determine that the ice-melting current margin calculation measure corresponding to the wind speed is a step of increasing the determined ice-melting current when determining the ice-melting current, and specifically includes: and determining the ice-melting current margin corresponding to the wind speed by taking a calculation measure of increasing the determined ice-melting current by a preset current increase value delta I1 when the ice-melting current is determined, wherein the delta I1 is 30-60A.
7. The OPGW ice-melting system according to claim 1, wherein the temperature margin determining unit is configured to determine a temperature-corresponding ice-melting current margin calculating measure according to the environment temperature T1 and the wire temperature T2, and specifically includes:
calculating the temperature difference delta T between the temperature T2 of the lead and the ambient temperature T1, and when the temperature difference delta T is greater than 0 ℃, determining ice-melting current margin calculation measures corresponding to the temperature to increase the determined ice-melting current when the ice-melting current is determined;
the current determining module is used for determining the ice-melting current according to the ice-coating thickness b, the wind speed v, the environment temperature T1, the lead temperature T2 and ice-melting current margin calculation measures corresponding to the temperature, and specifically comprises the following steps:
and determining ice melting current according to the ice coating thickness b, the wind speed v, the environment temperature T1 and the lead temperature T2, executing ice melting current margin calculation measures determined by the temperature margin determination unit, and increasing the determined ice melting current to finally determine the ice melting current.
8. The OPGW ice-melting system according to claim 7, wherein the temperature margin determining unit is configured to determine that the ice-melting current margin calculation measure corresponding to the temperature is a step of increasing the determined ice-melting current when determining the ice-melting current, and specifically includes: determining ice-melting current margin calculation measures corresponding to the temperature, namely increasing the determined ice-melting current by T times through a preset current increase value delta I2 when the temperature difference delta T is T ℃ and T is larger than 0; the preset current increase value delta I2 is 13A-20A.
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| CN202010708794.2A CN112054465B (en) | 2020-07-22 | 2020-07-22 | OPGW ice melting system |
| PCT/CN2021/088856 WO2022016928A1 (en) | 2020-07-22 | 2021-04-22 | Opgw ice melting system |
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| CN112054465B (en) * | 2020-07-22 | 2022-01-21 | 广东顺德电力设计院有限公司 | OPGW ice melting system |
| CN114636378B (en) * | 2022-03-21 | 2024-10-29 | 华北电力大学（保定） | Estimation method of critical wind speed in icing thickness monitoring based on distributed optical fiber temperature sensing |
| CN118070583B (en) * | 2023-12-05 | 2024-10-22 | 国网湖北省电力有限公司超高压公司 | Aluminum-clad steel strand critical ice melting current estimation method based on external environmental characteristics |
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| CN112054465A (en) | 2020-12-08 |
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