CN113011015B - Safety control method for dynamic capacity increase of power transmission and transformation line - Google Patents
Safety control method for dynamic capacity increase of power transmission and transformation line Download PDFInfo
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Abstract
The invention discloses a safety control method for dynamic capacity increase of a power transmission and transformation line, which comprises the following steps of: constructing a correlation function of the surface temperature of the cable in the target power transmission line and the conductor temperature; constructing a correlation function of the load of the cable and the conductor temperature in the target power transmission line, taking the maximum load of the cable as the capacity-increasing upper limit value of the power transmission line, and solving the upper limit value of the conductor temperature of the cable corresponding to the capacity-increasing upper limit value of the power transmission line through the correlation function of the load of the cable and the conductor temperature; and calculating the conductor temperature of the cable in the power transmission line in real time according to the correlation function of the surface temperature and the conductor temperature of the cable, and sending alarm information if the conductor temperature of the cable exceeds an upper limit value. The conductor temperature of the cable in the power transmission line is used as a judgment basis, environmental factors in the peripheral range of the cable and influence factors of the cable are integrated, the accuracy of the calculated transmission capacity of the power transmission line is improved, and the reliability of dynamic capacity-increasing regulation and control of the power transmission line is further improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a safety control method for dynamic capacity increase of a power transmission and transformation line.
Background
In recent years, the economy of China continues to increase rapidly, and the power grid transmission situation becomes more severe along with the rapid increase of the power consumption. The transmission capacity of the existing transmission line is strictly limited, and the transmission capacity of the transmission line is greatly influenced by the cable of the transmission line and the external environment, so that the transmission capacity of the existing transmission line is accurately improved under the restriction of the cable of the transmission line and the external environment, and the transmission capacity control method has great practical significance for improving the safe, economic and reliable operation of a power grid.
At present, a transmission line dynamic capacity increasing technology is mainly combined with a transmission line on-line monitoring technology, but due to the limitation of hardware technologies such as a sensor and a power supply in an on-line monitoring device at the present stage, collected on-line monitoring data has the problem of low accuracy and reliability, so that the risk of inaccurate transmission line current-carrying capacity obtained by system calculation can be caused by only depending on the on-line monitoring data to perform transmission line dynamic capacity increasing calculation.
For example, chinese patent document CN105470954B discloses "a dynamic capacity increasing system for power transmission lines", in which an online monitoring data acquisition unit acquires online monitoring data on a target power transmission line, and the online monitoring data acquisition unit accesses a database server through an online monitoring data transmission unit; collecting operation data of a target power transmission line by a line operation data FTP server and accessing the operation data into a database server; the statistical meteorological data of the area where the target power transmission line is located are collected by the statistical meteorological data FTP server and accessed into the database server, and the maximum current-carrying capacity of the target power transmission line is obtained by the dynamic capacity-increasing background unit according to the online monitoring data of the target power transmission line in the database server, the operation data of the target power transmission line and the statistical meteorological data of the area where the target power transmission line is located. The above patent has the disadvantage that the accuracy and reliability of the acquired online monitoring data are low, which results in low accuracy of the calculated transmission capacity of the power transmission line.
Disclosure of Invention
The invention mainly solves the technical problem of lower accuracy of the original control of dynamic capacity increase of the power transmission line; the method for safety control of dynamic capacity expansion of the power transmission and transformation line is characterized in that the conductor temperature of a cable in the power transmission and transformation line is used as a judgment basis to judge whether the transmission capacity of the power transmission line exceeds an upper limit value or not, the solution of the conductor temperature of the cable integrates environmental factors in the peripheral range of the cable and the influence factors of the cable, the accuracy of the calculated transmission capacity of the power transmission line is improved, and the reliability of dynamic capacity expansion control of the power transmission line is further improved.
The technical problem of the invention is mainly solved by the following technical scheme: the invention comprises the following steps:
s1, constructing a correlation function T of the surface temperature of the cable and the conductor temperature of the cable in the target power transmission linec＝H(Tf，Te，Da) Wherein T iscIs the conductor temperature, T, of the cablefIs the surface temperature, T, of the cableeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s2, constructing a correlation function T of the load of the cable and the conductor temperature of the cable in the target power transmission linec＝G(L，Te，Da) Wherein T iscIs the conductor temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s3, knowing the maximum load L of the cable in the target transmission linemaxMaximum load L of the cablemaxAs a function T of the capacity increase upper limit of the transmission line and the correlation of the load passing through the cable and the conductor temperature of the cablec＝G(L，Te，Da) Obtaining an upper limit value T of the conductor temperature of the cable corresponding to the capacity-increase upper limit value of the power transmission linecmax；
S4, according to the correlation function T of the surface temperature of the cable and the conductor temperature of the cablec＝H(Tf，Te，Da) Real-time calculation of conductor temperature T of cable in power transmission linecIf T isc>k·TcmaxAnd sending out alarm information and reducing the load L of the cable, wherein k is a safety coefficient and is less than 1.
When the transmission capacity of the power transmission line is larger, the conductor temperature of the cable in the power transmission line is higher and is in direct proportion, the transmission capacity of the power transmission line is judged whether to exceed the upper limit value or not by taking the conductor temperature of the cable in the power transmission line as a judgment basis, the solution of the conductor temperature of the cable integrates environmental factors in the peripheral range of the cable and the influence factors of the cable, the accuracy of the calculated transmission capacity of the power transmission line is improved, and the reliability of dynamic capacity increasing regulation and control of the power transmission line is further improved.
Preferably, the step S1 specifically includes:
s11, constructing a simulation system, wherein the simulation system comprises a target power transmission line model and an operating environment simulation model for simulating the environment of the target power transmission line;
s12, collecting the conductor temperature and the surface temperature of the cable in the target power transmission line model and the temperature and the humidity of the cable operation environment at the corresponding moment;
s13, repeating the step S12, and acquiring multiple groups of sample data;
s14, constructing the correlation function T of the surface temperature of the cable and the conductor temperature of the cable in the target power transmission line according to the plurality of groups of sample data in the step S13c＝H(Tf，Te，Da) Wherein T iscIs the conductor temperature, T, of the cablefIs the surface temperature, T, of the cableeTemperature of the operating environment of the cable, DaIs the humidity of the cable operating environment.
And constructing a simulation system for simulating the target power transmission line and the surrounding environment thereof, acquiring the conductor temperature and the surface temperature of the cable and the temperature and the humidity of the cable operating environment at the corresponding moment based on the simulation system, and associating the plurality of groups of data to construct an association function of the surface temperature of the cable and the conductor temperature of the cable in the target power transmission line without damaging the cable.
Preferably, the target power transmission line model comprises a liquid injection head, a liquid injection pipe, a liquid return pipe, a water storage tank and a cable, wherein the liquid injection head is arranged at each of two ends of the cable conductor respectively, the liquid injection head is connected with an insulating layer wrapped on the outer layer of the cable conductor in a sealing manner, the liquid injection head at one end of the cable conductor is connected with the liquid injection pipe, the liquid injection head at the other end of the cable conductor is connected with the liquid return pipe, the liquid injection pipe and the liquid return pipe are both connected with the water storage tank, and a heating device is arranged in the water storage tank.
Preferably, the target power transmission line model further comprises a temperature compensator, the temperature compensator is arranged on the liquid injection pipe and comprises a shell, and a compensation cylinder, a locking pipe and a liquid supplementing pipe which are arranged inside the shell, through holes for installing the liquid injection pipe are symmetrically arranged on two sides of the shell, one end of the compensation cylinder is communicated with the liquid injection pipe, the other end of the compensation cylinder is fixedly connected with the inner wall of the shell, a compensation spring and a sliding plug are arranged in the compensation cylinder, one end of the compensation spring is fixedly connected with the inside of the shell, the other end of the compensation spring is fixedly connected with the sliding plug, the sliding plug and the inner wall of the shell form a liquid storage cavity, the side wall of the liquid storage cavity is communicated with one end of the liquid supplementing pipe, the other end of the liquid supplementing pipe is communicated with the liquid injection pipe, the side wall of the compensation cylinder is communicated with the locking pipe, and a locking block and a locking spring are arranged in the locking pipe, one end of the locking spring is fixedly connected with the bottom of the locking pipe, the other end of the locking spring is fixedly connected with the locking block, the locking block is abutted against the sliding plug, and a temperature sensor is arranged at the position where the compensation barrel is communicated with the liquid injection pipe.
Because the water heated in the water storage tank needs to be injected into the air gap between the cable conductor and the insulating layer through the liquid injection pipe and the liquid injection head, in the flowing process, partial heat in the water can be lost, and the water temperature injected into the air gap between the cable conductor and the insulating layer is lower than the preset temperature, so that the temperature compensator is arranged at the position, close to the liquid injection head, of the liquid injection pipe. When the temperature of water flow detected by a temperature sensor arranged at the position where the compensation cylinder is communicated with the liquid injection pipe is lower than a set value, the controller controls the compensation spring to be electrified, the compensation spring is electrified to heat water in the liquid storage cavity, the compensation spring is electrified to contract, but the locking block is abutted to the sliding plug, so that the compensation spring cannot contract, when the electrified time of the compensation spring reaches a set time, the temperature of the water in the liquid storage cavity is higher than a set temperature delta t, and the locking spring is controlled to be lockedThe circular telegram is contract, and the locking piece is along with locking spring retracts to the locking pipe in, locking piece and sliding plug no longer looks butt, and compensation spring shrink drives the sliding plug upward movement, and the water with heating in the stock solution chamber is passed through the moisturizing pipe and is injected into the notes liquid pipe for the temperature reaches preset temperature in the notes liquid pipe. Ensures the correlation function T of the surface temperature of the cable and the conductor temperature of the cablec＝H(Tf，Te，Da) The accuracy of the method.
Preferably, the target power transmission line model further comprises a pressure regulator, the pressure regulator is arranged on the liquid injection pipe and comprises a base body, a plurality of regulating cylinders are arranged inside the base body and are communicated with the liquid injection pipe, regulating springs and regulating slide blocks are arranged in the regulating cylinders, one ends of the regulating springs are fixedly connected with the bottoms of the regulating cylinders, the other ends of the regulating springs are fixedly connected with the regulating slide blocks, and liquid storage sections are formed between the regulating slide blocks and the liquid injection pipe.
Because the cable has multiple specifications, the diameter of the conductor in the cable also has multiple specifications, the water flow in the liquid injection pipe can be adjusted through the pressure regulator, and the water flow injected into the air gap between the cable conductor and the insulating layer is controlled. When the adjusting spring is not electrified, the water flow passing through the liquid injection pipe is the maximum flow. The control regulating spring circular telegram shrink, the regulating spring shrink drives the regulating slide block upwards, and the pressure in the stock solution section reduces, annotates the water in the liquid pipe and enters into the stock solution section for the discharge of water in the notes liquid pipe of flowing through reduces. The multi-stage regulation of the water flow flowing through the liquid injection pipe can be realized by controlling the size of the electrified current of the regulating spring and controlling the electrified number of the regulating spring.
Preferably, the step S12 specifically includes:
the heating device heats water in the water storage tank to a preset temperature, and injects the water heated to the preset temperature into an air gap between the cable conductor and the insulating layer through the liquid injection pipe, wherein the preset temperature is the conductor temperature of the cable; after the air gap is filled with water, acquiring an infrared image of the surface of the cable through an infrared image unit, and calculating to obtain the surface temperature of the cable; when the infrared image unit collects the infrared image of the surface of the cable, the temperature and the humidity in the peripheral range of the cable are detected, and the temperature and the humidity of the running environment of the cable are obtained through detection.
Preferably, the acquiring the infrared image of the cable surface by the infrared image unit and calculating to obtain the surface temperature of the cable specifically include:
1) equally dividing the infrared image into S multiplied by S grids, wherein each grid is stored with n temperature values;
2) calculating each temperature value T in each gridiEffective area S ofi(1. ltoreq. i. ltoreq. n) with miTemperature value and T of pointiSame, then
3) Comparing each temperature value TiEffective area S ofiSize of (2), effective area SiTemperature value T corresponding to maximum valueiI.e. the temperature value in each grid, denoted T11，T12，……Tss；
4) And comparing the temperature values in each grid, wherein the maximum value is the surface temperature of the cable.
The highest temperature values in all points on the surface of the cable are used as the surface temperature of the cable, so that the reliability of dynamic capacity-increasing management and control of the power transmission line is improved, and the safety and reliability of transmission of the power transmission line are also improved.
Preferably, the step S2 specifically includes:
s21, collecting the load and the surface temperature of the cable in the target power transmission line and the temperature and the humidity of the running environment of the cable at the corresponding moment;
s22, repeating the step S21, and acquiring multiple groups of sample data;
s23, constructing a correlation function L ═ G '(T') of the load of the cable and the surface temperature of the cable in the target power transmission line according to the plurality of groups of sample data in the step S22f，Te，Da) Wherein T isfIs the surface temperature of the cable, L is the negative of the cableCarrier, TeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s24, and the correlation function T of the surface temperature of the cable of the target power transmission line and the conductor temperature of the cable in the simultaneous step S1c＝H(Tf，Te，Da) Constructing a correlation function T of the load of the cable and the conductor temperature of the cable in the target power transmission linec＝G(L，Te，Da) Wherein T iscIs the conductor temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaIs the humidity of the cable operating environment.
The beneficial effects of the invention are: when the transmission capacity of the power transmission line is larger, the conductor temperature of the cable in the power transmission line is higher and is in direct proportion, the transmission capacity of the power transmission line is judged whether to exceed the upper limit value or not by taking the conductor temperature of the cable in the power transmission line as a judgment basis, the solution of the conductor temperature of the cable integrates environmental factors in the peripheral range of the cable and the influence factors of the cable, the accuracy of the calculated transmission capacity of the power transmission line is improved, and the reliability of dynamic capacity increasing regulation and control of the power transmission line is further improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic structural diagram of a target power transmission line model of the present invention.
Fig. 3 is a schematic diagram of a temperature compensator according to the present invention.
FIG. 4 is a schematic diagram of one configuration of the pressure regulator of the present invention.
Fig. 5 is a schematic circuit diagram of the control structure for controlling the energization of the spring according to the present invention.
The liquid storage device comprises a cable 100, a cable 200, a water storage tank 301, a liquid injection head 302, a liquid injection pipe 303, a liquid return pipe 400, a temperature compensator 401, a compensation spring 402, a sliding plug 403, a compensation cylinder 404, a locking block 405, a locking spring 406, a locking pipe 407, a liquid supplementing pipe 408, a shell 409, a liquid storage cavity 410, a temperature sensor 500, a pressure regulator 501, an adjustment spring 502, an adjustment cylinder 503, an adjustment slide block 504, a liquid storage section 505 and a base body.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): as shown in fig. 1, the safety control method for dynamic capacity increase of a power transmission and transformation line in this embodiment includes the following steps:
s1, constructing a correlation function T of the surface temperature of the cable and the conductor temperature of the cable in the target power transmission linec＝H(Tf，Te，Da) Wherein T iscIs the conductor temperature, T, of the cablefIs the surface temperature, T, of the cableeTemperature of the operating environment of the cable, DaHumidity of the cable operating environment:
s11, constructing a simulation system, wherein the simulation system comprises a target power transmission line model and a running environment simulation model for simulating the environment of the target power transmission line;
s12, collecting the conductor temperature and the surface temperature of the cable in the target power transmission line model and the temperature and the humidity of the cable operation environment at the corresponding moment;
s13, repeating the step S12, and acquiring multiple groups of sample data;
s14, according to the multiple groups of sample data in the step S13, a correlation function T of the surface temperature of the cable and the conductor temperature of the cable in the target power transmission line is constructed through least square normal fittingc＝H(Tf，Te，Da) Wherein T iscIs the conductor temperature, T, of the cablefIs the surface temperature, T, of the cableeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s2, constructing a correlation function T of the load of the cable and the conductor temperature of the cable in the target power transmission linec＝G(L，Te，Da) Wherein T iscIs the conductor temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaHumidity of the cable operating environment:
s21, collecting the load and the surface temperature of the cable in the target power transmission line and the temperature and the humidity of the running environment of the cable at the corresponding moment;
s22, repeating the step S21, and acquiring multiple groups of sample data;
s23, according to the multiple groups of sample data in the step S22, a correlation function L ═ G '(T') of the load of the cable and the surface temperature of the cable in the target power transmission line is constructed through least square normal fittingf，Te，Da) Wherein T isfIs the surface temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s24, and the correlation function T of the surface temperature of the cable of the target power transmission line and the conductor temperature of the cable in the simultaneous step S1c＝H(Tf，Te，Da) Constructing a correlation function T of the load of the cable and the conductor temperature of the cable in the target power transmission linec＝G(L，Te，Da) Wherein T iscIs the conductor temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s3, knowing the maximum load L of the cable in the target transmission linemaxPutting the maximum load L of the cablemaxAs a function T of the capacity increase upper limit value of the power transmission line and the correlation between the load of the cable and the conductor temperature of the cablec＝G(L，Te，Da) Obtaining an upper limit value T of the conductor temperature of the cable corresponding to the capacity increase upper limit value of the power transmission linecmax；
S4, according to the correlation function T of the surface temperature of the cable and the conductor temperature of the cablec＝H(Tf，Te，Da) Real-time calculation of conductor temperature T of cable in power transmission linecIf T isc>k·TcmaxAnd sending out alarm information and reducing the load L of the cable, wherein k is a safety coefficient and is less than 1.
As shown in fig. 2, the target power transmission line model includes a liquid injection head 301, a liquid injection pipe 302, a liquid return pipe 303, a water storage tank 200, a cable 100, a temperature compensator 400 and a pressure regulator 500, the two ends of the cable conductor are respectively provided with the liquid injection head, the liquid injection head is hermetically connected with an insulating layer wrapped on the outer layer of the cable conductor, the liquid injection head at one end of the cable conductor is connected with the liquid injection pipe, the liquid injection head at the other end of the cable conductor is connected with the liquid return pipe, the liquid injection pipe and the liquid return pipe are both connected with the water storage tank, a heating device is arranged in the water storage tank, the temperature compensator and the pressure regulator are both arranged on the liquid injection pipe, the position of the temperature compensator on the liquid injection pipe is close to the liquid injection head, the position of the pressure regulator on the liquid injection pipe is close to the water storage tank, and the target power transmission line model is controlled by the controller.
As shown in FIG. 3, the temperature compensator comprises a shell 408, a compensating cylinder 403, a locking pipe 406 and a liquid supplementing pipe 407, wherein the compensating cylinder 403, the locking pipe 406 and the liquid supplementing pipe 407 are arranged in the shell, through holes for installing the liquid supplementing pipe are symmetrically arranged on two sides of the shell, one end of the compensating cylinder is communicated with the liquid supplementing pipe, the other end of the compensating cylinder is fixedly connected with the inner wall of the shell, a compensating spring 401 and a sliding plug 402 are arranged in the compensating cylinder, one end of the compensating spring is fixedly connected with the inner part of the shell, the other end of the compensating spring is fixedly connected with the sliding plug, the sliding plug and the inner wall of the shell form a liquid storage cavity 409, the side wall of the liquid storage cavity is communicated with one end of the liquid supplementing pipe, the other end of the liquid supplementing pipe is communicated with the liquid supplementing pipe, the side wall of the compensating cylinder is communicated with the locking pipe, a locking block 404 and a locking spring 405 are arranged in the locking pipe, one end of the locking spring is fixedly connected with the bottom of the locking pipe, the other end of the locking spring is fixedly connected with the locking block, the locking block is abutted against the sliding plug, a temperature sensor 410 is arranged at the position where the compensation cylinder is communicated with the liquid injection pipe, and the direction of an arrow in the figure is the water flow direction.
The pressure regulator is shown in fig. 4, and comprises a base body 505, wherein through holes for installing liquid injection pipes are symmetrically formed in two sides of the base body, 3 adjusting barrels 502 are arranged in the base body, 3 adjusting barrels are sequentially arranged, the 3 adjusting barrels are communicated with the liquid injection pipes, an adjusting spring 501 and an adjusting slide block 503 are arranged in each adjusting barrel, one end of each adjusting spring is fixedly connected with the bottom of each adjusting barrel, the other end of each adjusting spring is fixedly connected with the corresponding adjusting slide block, and a liquid storage section 504 is formed between each adjusting slide block and each liquid injection pipe.
Based on the target power transmission line model, the step S12 collects the conductor temperature and the surface temperature of the cable in the target power transmission line model and the temperature and the humidity of the cable operation environment at the corresponding moment, and specifically includes:
the heating device heats water in the water storage tank to a preset temperature, the water heated to the preset temperature is injected into an air gap between a cable conductor and an insulating layer through the liquid injection pipe, the preset temperature is the conductor temperature of the cable, after the air gap is filled with the water, an infrared image of the surface of the cable is acquired through the infrared image unit, and the surface temperature of the cable is calculated and obtained; when the infrared image unit collects the infrared image of the surface of the cable, the temperature and the humidity in the peripheral range of the cable are detected, and the temperature and the humidity of the running environment of the cable are obtained through detection. The temperature detection of the peripheral range of the cable can be detected by a temperature sensor, and the humidity detection of the peripheral range of the cable can be detected by a humidity sensor. The water injected into the air gap returns to the water storage tank through the liquid return pipe for recycling.
Gather the infrared image on cable surface through infrared image unit, calculate the surface temperature who obtains the cable, specifically include:
1) equally dividing the infrared image into S multiplied by S grids, wherein each grid is stored with n temperature values;
2) calculating each temperature value T in each gridiEffective area S ofi(1. ltoreq. i. ltoreq. n) with miTemperature value and T of pointiSame, then
3) Comparing each temperature value TiEffective area S ofiSize of (2), effective area SiTemperature value T corresponding to maximum valueiI.e. the temperature value in each grid, denoted T11，T12，……Tss；
4) And comparing the temperature values in each grid, wherein the maximum value is the surface temperature of the cable.
Because the water heated in the water storage tank needs to be injected into the air gap between the cable conductor and the insulating layer through the liquid injection pipe and the liquid injection head, in the flowing process, partial heat in water can be lost, and the water temperature injected into the air gap between the cable conductor and the insulating layer is lower than the preset temperature, so that a temperature compensator is arranged at the position, close to the liquid injection head, of the liquid injection pipe. When the temperature of water flow detected by a temperature sensor arranged at the position where the compensation barrel is communicated with the liquid injection pipe is lower than a set value, the controller controls the compensation spring to be electrified, the compensation spring is electrified to heat water in the liquid storage cavity and can be contracted, but the locking block is abutted with the sliding plug, so that the compensation spring cannot be contracted, when the electrified time of the compensation spring reaches a set time, the temperature of the water in the liquid storage cavity is higher than a set temperature delta t, the locking spring is controlled to be electrified and contracted, the locking block retracts into the locking pipe along with the locking spring, the locking block is not abutted with the sliding plug any more, the compensation spring is contracted to drive the sliding plug to move upwards, the water heated in the liquid storage cavity is injected into the liquid injection pipe through compensation, and the temperature of the water in the liquid injection pipe reaches the preset temperature.
Because the cable has multiple specifications, the diameter of the conductor in the cable also has multiple specifications, the water flow in the liquid injection pipe can be adjusted through the pressure regulator, and the water flow injected into the air gap between the cable conductor and the insulating layer is controlled. When the adjusting spring is not electrified, the water flow passing through the liquid injection pipe is the maximum flow. The regulating spring is controlled to be electrified and contracted, the regulating spring is contracted to drive the regulating slide block to move upwards, the pressure in the liquid storage section is reduced, and water in the liquid injection pipe enters the liquid storage section, so that the water flow flowing through the liquid injection pipe is reduced. The multi-stage adjustment of the water flow flowing through the liquid injection pipe can be realized by controlling the size of the electrifying current of the adjusting spring and the electrifying number of the adjusting spring.
The control structure for controlling the energization of the compensation spring, the locking spring and the adjusting spring is shown in fig. 5, the single chip microcomputer CPU outputs a high level after receiving the specified information, the coil KM of the relay is controlled to be energized, the normally open switch KM1 of the relay is closed, and the springs can be energized. When the compensation spring is controlled, the designated information received by the single chip microcomputer CPU is that the temperature of water flow detected by a temperature sensor arranged at the position where the compensation cylinder is communicated with the liquid injection pipe is lower than a set value; when the spring is controlled to be locked, the designated information received by the single chip microcomputer CPU is that the energizing time of the compensation spring reaches the set time and the temperature of water in the liquid storage cavity is higher than the set temperature delta t DEG C; when the adjusting spring is controlled, the designated information received by the single chip microcomputer CPU is the diameter of the conductor in the cable.
Claims (5)
1. A safety control method for dynamic capacity increase of a power transmission and transformation line is characterized by comprising the following steps:
s1, constructing a correlation function T of the surface temperature of the cable and the conductor temperature of the cable in the target power transmission linec＝H(Tf，Te，Da) Wherein T iscIs the conductor temperature, T, of the cablefIs the surface temperature, T, of the cableeTemperature of the operating environment of the cable, DaFor the humidity of cable operational environment, specifically include:
s11, constructing a simulation system, wherein the simulation system comprises a target transmission line model and a running environment simulation model for simulating the environment of the target transmission line, the target transmission line model comprises a liquid injection head, a liquid injection pipe, a liquid return pipe, a water storage tank, a cable and a temperature compensator, the liquid injection head is respectively arranged at two ends of a conductor of the cable, the liquid injection head is hermetically connected with an insulating layer wrapped on the outer layer of the conductor of the cable, the liquid injection head at one end of the conductor of the cable is connected with the liquid injection pipe, the liquid injection head at the other end of the conductor of the cable is connected with the liquid return pipe, the liquid injection pipe and the liquid return pipe are both connected with the water storage tank, a heating device is arranged in the water storage tank, the temperature compensator is arranged on the liquid injection pipe, the temperature compensator comprises a shell, and a compensation barrel, a locking pipe and a liquid supply pipe which are arranged in the shell, through holes for installing liquid filling pipes are symmetrically arranged on two sides of the shell, one end of the compensation cylinder is communicated with the liquid filling pipes, the other end of the compensation cylinder is fixedly connected with the inner wall of the shell, a compensation spring and a sliding plug are arranged in the compensation cylinder, one end of the compensation spring is fixedly connected with the inside of the shell, the other end of the compensation spring is fixedly connected with the sliding plug, the sliding plug and the inner wall of the shell form a liquid storage cavity, the side wall of the liquid storage cavity is communicated with one end of the liquid supplementing pipe, the other end of the liquid supplementing pipe is communicated with the liquid injection pipe, the side wall of the compensation cylinder is communicated with the locking pipe, a locking block and a locking spring are arranged in the locking pipe, one end of the locking spring is fixedly connected with the bottom of the locking pipe, the other end of the locking spring is fixedly connected with a locking block, the locking block is abutted against a sliding plug, and a temperature sensor is arranged at the position where the compensation cylinder is communicated with the liquid injection pipe;
s12, collecting the conductor temperature and the surface temperature of the cable in the target power transmission line model and the temperature and the humidity of the cable running environment at the corresponding moment;
s13, repeating the step S12, and acquiring multiple groups of sample data;
s14, constructing a correlation function T between the surface temperature of the cable and the conductor temperature of the cable in the target power transmission line according to the multiple groups of sample data in the step S13c＝H(Tf，Te，Da) Wherein T iscIs the conductor temperature, T, of the cablefIs the surface temperature, T, of the cableeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s2, constructing a correlation function T of the load of the cable and the conductor temperature of the cable in the target power transmission linec＝G(L，Te，Da) Wherein T iscIs the conductor temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s3, knowing the maximum load L of the cable in the target transmission linemaxPutting the maximum load L of the cablemaxAs a function T of the capacity increase upper limit of the transmission line and the correlation of the load passing through the cable and the conductor temperature of the cablec＝G(L，Te，Da) Obtaining an upper limit value T of the conductor temperature of the cable corresponding to the capacity-increase upper limit value of the power transmission linecmax；
S4, according to the correlation function T of the surface temperature of the cable and the conductor temperature of the cablec＝H(Tf，Te，Da) Real-time calculation of conductor temperature T of cable in power transmission linecIf T isc＞k*TcmaxAnd sending out alarm information and reducing the load L of the cable, wherein k is a safety coefficient and is less than 1.
2. The safety control method according to claim 1, wherein the target power transmission line model further comprises a pressure regulator, the pressure regulator is disposed on the liquid injection pipe, the pressure regulator comprises a base body, a plurality of regulating cylinders are disposed inside the base body, the regulating cylinders are both communicated with the liquid injection pipe, regulating springs and regulating sliders are disposed inside the regulating cylinders, one ends of the regulating springs are fixedly connected with the bottoms of the regulating cylinders, the other ends of the regulating springs are fixedly connected with the regulating sliders, and a liquid storage section is formed between the regulating sliders and the liquid injection pipe.
3. The safety control method for dynamic capacity expansion of power transmission and transformation lines according to claim 2, wherein the step S12 specifically comprises:
the heating device heats water in the water storage tank to a preset temperature, and injects the water heated to the preset temperature into an air gap between the cable conductor and the insulating layer through the liquid injection pipe, wherein the preset temperature is the conductor temperature of the cable; after the air gap is filled with water, acquiring an infrared image of the surface of the cable through an infrared image unit, and calculating to obtain the surface temperature of the cable; when the infrared image unit collects the infrared image of the surface of the cable, the temperature and the humidity of the peripheral range of the cable are detected, and the temperature and the humidity of the running environment of the cable are detected.
4. The safety control method for dynamic capacity expansion of the power transmission and transformation line according to claim 3, wherein the step of acquiring the infrared image of the surface of the cable through the infrared image unit and calculating the surface temperature of the cable comprises the following specific steps:
1) equally dividing the infrared image into S multiplied by S grids, wherein n temperature values are stored in each grid;
2) calculating each temperature value T in each gridiEffective area S ofiN is more than or equal to 1 and less than or equal to n and miPoint temperature value and TiAre the same as each other, then
3) Comparing each temperature value TiEffective area S ofiSize of (2), effective area SiTemperature value T corresponding to maximum valueiI.e. the temperature value in each grid, denoted T11，T12，……Tss；
4) And comparing the temperature values in each grid, wherein the maximum value is the surface temperature of the cable.
5. The safety control method for dynamic capacity expansion of power transmission and transformation lines according to claim 1, wherein the step S2 specifically comprises:
s21, collecting the load and the surface temperature of the cable in the target power transmission line and the temperature and the humidity of the operating environment of the cable at the corresponding moment;
s22, repeating the step S21 to obtain a plurality of groups of sample data;
s23, constructing a correlation function L ═ G '(T') of the load of the cable and the surface temperature of the cable in the target power transmission line according to the multiple groups of sample data in the step S22f，Te，Da) Wherein T isfIs the surface temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaThe humidity of the cable operating environment;
s24, and the correlation function T of the surface temperature of the cable of the target power transmission line and the conductor temperature of the cable in the simultaneous step S1c＝H(Tf，Te，Da) Constructing a correlation function T of the load of the cable and the conductor temperature of the cable in the target power transmission linec＝G(L，Te，Da) Wherein T iscIs the conductor temperature of the cable, L is the load of the cable, TeTemperature of the operating environment of the cable, DaIs electricityThe humidity of the cable operating environment.
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| JP4073743B2 (en) * | 2002-09-20 | 2008-04-09 | 東京電力株式会社 | Cable conductor temperature estimation method, conductor temperature estimation system, and conductor temperature estimation recording medium |
| KR100567887B1 (en) * | 2003-12-04 | 2006-04-04 | 엘에스전선 주식회사 | Apparatus and Method for Analysis of Electric Power Transmission Link Status Having Function of Real-Time Evaluating Thermal Parameters Outside the Link |
| JP5037251B2 (en) * | 2007-07-19 | 2012-09-26 | 東京電力株式会社 | Cable conductor temperature estimation method, cable conductor temperature estimation system, and cable conductor temperature estimation program in consideration of the latent heat effect in the cave |
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| CN106777522A (en) * | 2016-11-11 | 2017-05-31 | 广东电网有限责任公司清远供电局 | Transmission pressure temperature checking method, maximum carrying capacity detection method and system |
| US10726582B2 (en) * | 2018-03-15 | 2020-07-28 | Sharper Shape Oy | Method and system for determining lone temperature of overhead power line |
| CN108535570B (en) * | 2018-04-19 | 2020-07-03 | 陕西协成测试技术有限公司 | Cable load measuring device and measuring method |
| CN109659927B (en) * | 2018-10-24 | 2022-06-17 | 国网天津市电力公司电力科学研究院 | Energy storage capacity configuration method of comprehensive energy microgrid considering energy storage participation degree |
| CN111460639B (en) * | 2020-03-24 | 2020-12-29 | 武汉三江中电科技有限责任公司 | Method and device for dynamically calculating temperature of cable conductor, electronic equipment and storage medium |
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