CN105388351A - HVDC line corona current measuring system used in high-altitude area - Google Patents
HVDC line corona current measuring system used in high-altitude area Download PDFInfo
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- CN105388351A CN105388351A CN201510685694.1A CN201510685694A CN105388351A CN 105388351 A CN105388351 A CN 105388351A CN 201510685694 A CN201510685694 A CN 201510685694A CN 105388351 A CN105388351 A CN 105388351A
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- 238000012545 processing Methods 0.000 claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 239000013307 optical fiber Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims description 45
- 238000001514 detection method Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims 1
- 239000012793 heat-sealing layer Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor
- G05D23/306—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor using semiconductor devices
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention provides an HVDC line corona current measuring system used in a high-altitude area. The HVDC line corona current measuring system comprises a remote end subsystem and a local end subsystem, wherein the remote end subsystem is arranged at a high-altitude DC power transmission line side, and the local end subsystem is arranged at an upper level control center; the remote end subsystem comprises a corona current acquiring module, a humidity detecting module and a temperature control module which are connected with an integrated control processing module; the local end subsystem comprises a data integrated processing platform; and the integrated control processing module is connected with the data integrated processing platform through an optical fiber. Compared with the prior art, the HVDC line corona current measuring system used in the high-altitude area provided by the invention can adapt to corona current measurement in the high-altitude area under low temperature condition, can control the internal temperature of the remote end subsystem, guarantees stable operation of the measuring system, and can prolong working time of the system.
Description
Technical Field
The invention relates to the technical field of high-altitude power transmission line measurement, in particular to a high-voltage direct current line corona current measurement system for a high-altitude area.
Background
The ultra-high voltage transmission is developed on the basis of ultra-high voltage transmission, can realize long-distance and large-capacity transmission of electric energy, and is suitable for interconnection of large-area power grids. Different from the ultra-high voltage alternating current transmission, the ultra-high voltage direct current transmission has lower line cost and lower power loss and is more suitable for electric energy transmission in an ultra-long distance.
The source of problems related to the electromagnetic environment is mostly corona discharge, and the generation of space radiation electromagnetic field by corona current is radio interference; the corona produces ions with high speed, which causes air compression and audible noise, and the dc line corona produces space charge and thus space electric field. Therefore, the corona current, which reveals the electromagnetic environment parameters and the nature of the corona discharge, must be intensively studied. The corona discharge belongs to random pulse discharge and has a wide frequency spectrum. In engineering, the electromagnetic environment parameters such as radio interference and the like are generally measured to be more than 30 MHz. From a research point of view, a wider frequency domain needs to be considered. Therefore, an all-weather broadband corona current testing means is required, and necessary conditions are provided for researching corona current characteristics of ultra-high voltage lines and alternating current and direct current transmission lines which are erected in a mixed mode in different altitudes and different climatic environments in the future.
Corona loss and environmental effect caused by corona are two key problems to be solved in direct current transmission engineering, corona current is physical quantity directly related to the corona loss and the environmental effect, and is the most direct physical quantity for representing line corona discharge conditions, and basis can be provided for improving the wire configuration of an ultra-high voltage transmission line by researching the corona current. Driven by the research needs of corona current, the Chinese institute of electrical science and technology and Beijing university of aerospace have successfully developed a sampling sensor with a frequency band response of 30MHz, and the southern power grid technology research center and Qinghua university have developed a corona current measurement system with a bandwidth of 50MHz, but no measurement system for high-altitude regions, especially regions with an altitude of more than 2000 m.
When determining the structure of the conductor of the extra-high voltage direct current transmission line, not only the resistance loss when the current passes through the conductor but also the corona loss needs to be considered. At present, a plurality of direct current lines are used in high-altitude areas (the altitude of a brocade-Sunan +/-800 kV direct current engineering approach is up to 3600m, the altitude of a Qinghai-Tibet direct current line approach is up to 5300m, and the Jundong-Sichuan +/-1100 kV direct current engineering also passes through the areas with the altitudes exceeding 3000 m), and the corona of the direct current transmission line in the high-altitude areas is more serious than that in the low-altitude areas. The corona problem of the high-altitude direct current transmission line is not systematically researched internationally. In addition, under some special conditions, the weather of the direct current line passing through the region is very bad, and if the proportion of rain, snow, frost and fog is large all year round, the proportion of corona loss in the total loss of the line is correspondingly increased. The method has the advantages that the corona loss of the power transmission line is measured and evaluated, and the method has important guiding significance on line design and economic operation. The corona loss is one of important contents of economic analysis in the design of the power transmission line, but the corona loss of the high-altitude direct-current power transmission line cannot be estimated at present, and a corresponding measurement system is not available.
Extreme cold weather may occur in high altitude areas, and the duration is long, which has a great influence on the performance of the measuring equipment, especially the power supply capacity of a lithium battery of a power supply system, so that a new requirement is put forward on the environmental adaptability of the whole corona current measuring system. Aiming at the problems of large temperature difference change, extremely low temperature environment and the like in a high altitude area, corresponding environment adaptability design is needed, so that the electronic measurement system can normally work in an extreme environment of the high altitude area, and the high-voltage direct current line corona current measurement system suitable for the high altitude area needs to be further developed.
Disclosure of Invention
To meet the needs of the prior art, the present invention provides a high voltage direct current line corona current measurement system for use in high altitude areas.
The technical scheme of the invention is as follows:
the corona current measurement system comprises a remote terminal system and a local terminal system; the remote terminal system is arranged on the high-altitude direct-current transmission line side, and the local terminal system is arranged in the upper-level control center;
the remote terminal system comprises a corona current acquisition module, a humidity detection module and a temperature control module which are respectively connected with the comprehensive control processing module; the local terminal system comprises a data comprehensive processing platform; the comprehensive control processing module is connected with the data comprehensive processing platform through an optical fiber.
Preferably, the corona current collecting module comprises an ultrahigh voltage direct current line wide frequency domain corona current sensor for collecting a corona current signal of the direct current line;
preferably, the temperature control module comprises a temperature sensor, a temperature comprehensive control module and a heating module;
the temperature sensor collects a temperature signal T inside the remote terminal system and sends the temperature signal T to the temperature comprehensive control module;
the temperature comprehensive control module drives the heating module to heat according to the temperature signal T and a temperature control target instruction sent by the comprehensive control processing module;
preferably, the power output gears of the heating module comprise a high heating gear and a low heating gear;
when the temperature signal T > ThWhen the temperature is detected, the temperature comprehensive control module does not send a heating instruction to the heating module;
when the temperature signal T isl＜T＜ThWhen the temperature is detected, the temperature comprehensive control module sends a low heating gear instruction to the heating module;
when the temperature signal T is less than TlWhen the temperature is detected, the temperature comprehensive control module sends a high heating gear instruction to the heating module;
wherein, ThAnd TlRespectively setting a preset upper temperature limit and a preset lower temperature limit;
preferably, the temperature control module further comprises a heat preservation and insulation sealing layer; the insulating and heat-insulating sealing layer is arranged inside the shell of the remote terminal system;
preferably, the humidity detection module comprises a humidity sensor and a humidity measurement plate;
the humidity sensor is used for acquiring a humidity signal in the remote terminal system and sending the humidity signal to the humidity measuring plate;
the humidity measuring board converts the humidity signal from analog quantity to digital quantity and sends the digital quantity to the comprehensive control processing module;
preferably, the data comprehensive processing platform comprises a storage module and a human-computer display module;
the storage module is used for storing the corona current signal, the temperature signal and the humidity signal which are sent by the remote terminal system;
the man-machine display module is used for displaying the corona current signal, the temperature signal and the humidity signal and controlling the temperature of the remote terminal system;
preferably, the remote end subsystem and the local end subsystem both comprise optical fiber insulators, so that the remote end subsystem and the local end subsystem are connected through optical fibers;
and the comprehensive control processing module sends the corona current signal, the temperature signal and the humidity signal to the data comprehensive processing platform through optical fibers.
Compared with the closest prior art, the excellent effects of the invention are as follows:
1. the corona current measuring system for the high-voltage direct-current line in the high-altitude area can adapt to the corona current measurement work under the shading condition of the high-altitude area, the internal temperature of a remote terminal system is controllable, the stable operation of the measuring system is ensured, and the working time of the system is prolonged as much as possible through program control;
2. according to the high-voltage direct current line corona current measuring system for the high-altitude area, the shell of the remote terminal system heats the heat-insulating layer, the number of heating modules is reduced, and the energy consumption of the measuring system is reduced;
3. the corona current measuring system for the high-voltage direct current line in the high-altitude area adopts the optical fiber to transmit the measured data, and is not easily influenced by the external complex electromagnetic environment.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1: the structural schematic diagram of a corona current measuring system of a high-voltage direct-current line used in a high-altitude area in the embodiment of the invention;
FIG. 2: the temperature control module in the embodiment of the invention is in a schematic structure.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The embodiment of the corona current measurement system for the high-voltage direct current line in the high-altitude area, provided by the invention, is shown in fig. 1, and specifically comprises the following steps: the corona current measurement system includes a remote terminal system and a local terminal system.
Remote terminal system
The remote terminal system is arranged on the side of the high-altitude direct-current transmission line and used for collecting corona current of the high-altitude direct-current transmission line. The remote terminal system comprises a corona current acquisition module, a humidity detection module, a temperature control module and an optical fiber transmission module which are respectively connected with the comprehensive control processing module.
1. Corona current collecting module
The corona current acquisition module in this embodiment includes the wide frequency domain corona current sensor of extra-high voltage direct current circuit, gathers direct current circuit's corona current signal.
2. Temperature control module
The temperature control module is mainly used for ensuring the regulation of the internal temperature of the remote terminal system under the extremely cold condition and ensuring that the temperature of the remote terminal system is suitable for normal work of other modules, particularly power supply modules. As shown in FIG. 2, the temperature control module comprises a temperature sensor, a temperature integrated control module, a heating module and a heat preservation and insulation sealing layer.
(1) Temperature sensor
In this embodiment, the temperature sensor collects the temperature signal T inside the remote terminal system and sends the temperature signal T to the temperature integrated control module.
(2) Temperature integrated control module
In this embodiment, the temperature integrated control module drives the heating module to heat according to the temperature signal T and the temperature control target instruction issued by the integrated control processing module.
(3) Heating module
In this embodiment, the heating module employs a direct-current heating pipe. The direct-current heating pipe can be directly powered by a direct-current power supply of the system and works according to the instruction of the temperature comprehensive control module. The heating pipe has a high heating gear and a low heating gear, and is simple to control. Meanwhile, the heating module can also adopt resistance wire heating or other modes such as xenon lamp heating and the like. Wherein,
the power output gears of the heating module comprise a high heating gear and a low heating gear:
① when the temperature signal T > ThWhen the temperature is detected, the temperature comprehensive control module does not send a heating instruction to the heating module;
② when the temperature signal T isl＜T＜ThWhen the temperature control module is started, the temperature comprehensive control module sends a low-grade heating instruction to the heating module;
③ when the temperature signal T is less than TlWhen the temperature control module is started, the temperature comprehensive control module sends a high heating gear instruction to the heating module;
wherein, ThAnd TlRespectively a preset upper temperature limit and a preset lower temperature limit.
In this embodiment, T is seth5 ℃ and Tl＝-5℃。
(4) Heat-preserving and heat-insulating sealing layer
In the embodiment, the heat preservation and insulation sealing layer is arranged; the insulating heat seal layer is disposed inside a housing of the remote terminal system. The heat preservation and insulation sealing layer is made of heat preservation and insulation materials, so that better environmental adaptability can be provided, the use of a temperature control module is reduced, the energy consumption of the whole system is reduced, and the working time is prolonged.
In this embodiment, the medium temperature control module drives the heating module to heat according to the received temperature control target instruction and the temperature signal, that is, the closed-loop automatic control program is adopted to complete temperature adjustment.
3. Humidity detection module
The humidity detection module in this embodiment includes a humidity sensor and a humidity measurement board. Wherein,
and the humidity sensor is used for acquiring a humidity signal inside the remote terminal system and sending the humidity signal to the humidity measuring plate.
The humidity measurement board converts the analog quantity of the humidity signal measured by the humidity sensor into digital quantity, and then the digital quantity is directly connected to the comprehensive control processing module, and the comprehensive control processing module sends the humidity value and the corona current signal to the local terminal system through the optical fiber.
4. Integrated control processing module
In this embodiment, the integrated control processing module is configured to receive output signals of the corona current collecting module, the humidity detecting module, and the temperature control module, perform data conversion on the output signals, and finally transmit the data-converted electrical signals to the optical fiber transmission module to be converted into optical signals, so as to transmit the optical signals to the local terminal system through the optical fiber transmission module, and perform power supply control on each module.
Second, local terminal system
The local terminal system is arranged in the superior control center and comprises a data comprehensive processing platform. The comprehensive control processing module is connected with the data comprehensive processing platform through an optical fiber. The data comprehensive processing platform restores the received electric signals into corona current data, temperature detection data and humidity detection data, and realizes the processing of the corona current data and the temperature control of a remote terminal system.
The data comprehensive processing platform in the embodiment comprises a storage module and a man-machine display module;
the method comprises the following steps: and the storage module is used for storing the corona current signal, the temperature signal and the humidity signal which are sent by the remote terminal system.
Secondly, the step of: and the man-machine display module is used for displaying the corona current signal, the temperature signal and the humidity signal and controlling the temperature of the remote terminal system.
In this embodiment, the remote end subsystem and the local end subsystem both include optical fiber insulators, so that the two are connected through optical fibers.
Finally, it should be noted that: the described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (8)
1. A corona current measurement system for a high voltage direct current line in a high altitude area, the corona current measurement system comprising a remote terminal system and a local terminal system; the remote terminal system is arranged on the high-altitude direct-current transmission line side, and the local terminal system is arranged in the upper-level control center;
the remote terminal system comprises a corona current acquisition module, a humidity detection module and a temperature control module which are respectively connected with the comprehensive control processing module; the local terminal system comprises a data comprehensive processing platform; the comprehensive control processing module is connected with the data comprehensive processing platform through an optical fiber.
2. The HVDC line corona current measurement system for high altitude areas of claim 1, wherein the corona current collection module comprises an extra-high voltage DC line wide frequency domain corona current sensor to collect a corona current signal of the DC line.
3. The high-voltage direct current line corona current measuring system for the high altitude area as set forth in claim 1, wherein said temperature control module comprises a temperature sensor, a temperature integrated control module and a heating module;
the temperature sensor collects a temperature signal T inside the remote terminal system and sends the temperature signal T to the temperature comprehensive control module;
and the temperature comprehensive control module drives the heating module to heat according to the temperature signal T and a temperature control target instruction sent by the comprehensive control processing module.
4. The HVDC line corona current measurement system for high altitude areas of claim 3, wherein the power output gears of the heating module comprise a high heating gear and a low heating gear;
when the temperature signal T > ThWhen the temperature is detected, the temperature comprehensive control module does not send a heating instruction to the heating module;
when the temperature signal T isl＜T＜ThWhen the temperature is detected, the temperature comprehensive control module sends a low heating gear instruction to the heating module;
when the temperature signal T is less than TlWhen the temperature is detected, the temperature comprehensive control module sends a high heating gear instruction to the heating module;
wherein, ThAnd TlRespectively a preset upper temperature limit and a preset lower temperature limit.
5. The system for measuring corona current of the high-voltage direct current line in the high altitude area according to claim 1, wherein the temperature control module further comprises a heat preservation and insulation sealing layer; the insulating and heat-sealing layer is disposed inside a housing of the remote terminal system.
6. The high-voltage direct current line corona current measuring system for the high altitude area as claimed in claim 1, wherein said humidity detecting module comprises a humidity sensor and a humidity measuring plate;
the humidity sensor is used for acquiring a humidity signal in the remote terminal system and sending the humidity signal to the humidity measuring plate;
the humidity measuring board converts the humidity signal from analog quantity to digital quantity and sends the digital quantity to the comprehensive control processing module.
7. The system for measuring the corona current of the high-voltage direct-current line in the high altitude area according to claim 1, wherein the data comprehensive processing platform comprises a storage module and a human-computer display module;
the storage module is used for storing the corona current signal, the temperature signal and the humidity signal which are sent by the remote terminal system;
and the man-machine display module is used for displaying the corona current signal, the temperature signal and the humidity signal and controlling the temperature of the remote terminal system.
8. The high voltage direct current line corona current measurement system for high altitude areas of claim 1, wherein said remote end subsystem and local end subsystem each include fiber optic insulators such that they are connected by optical fibers;
and the comprehensive control processing module sends the corona current signal, the temperature signal and the humidity signal to the data comprehensive processing platform through optical fibers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510685694.1A CN105388351A (en) | 2015-10-21 | 2015-10-21 | HVDC line corona current measuring system used in high-altitude area |
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| CN201510685694.1A CN105388351A (en) | 2015-10-21 | 2015-10-21 | HVDC line corona current measuring system used in high-altitude area |
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Cited By (3)
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| CN116953451A (en) * | 2023-08-01 | 2023-10-27 | 华北电力大学（保定） | Test system and test method for negative polarity corona discharge |
| CN117347681A (en) * | 2023-12-06 | 2024-01-05 | 中铁武汉电气化设计研究院有限公司 | DC resistance tester |
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| CN117347681A (en) * | 2023-12-06 | 2024-01-05 | 中铁武汉电气化设计研究院有限公司 | DC resistance tester |
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Inventor after: Liu Yuanqing Inventor after: Lv Jianxun Inventor after: Lu Jiayu Inventor after: Yuan Haiwen Inventor after: Liu Hongyu Inventor after: Xin Encheng Inventor after: Wang Qiang Inventor before: Liu Yuanqing Inventor before: Lv Jianxun Inventor before: Lu Jiayu Inventor before: Yuan Haiwen Inventor before: Liu Hongyu Inventor before: Xin Encheng |
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Effective date of registration: 20170310 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant after: China Electric Power Research Institute Applicant after: Beihang University Applicant after: State Grid Corporation of China Applicant after: STATE GRID SHANXI ELECTRIC POWER CO., LTD. Address before: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Applicant before: China Electric Power Research Institute Applicant before: Beihang University Applicant before: State Grid Corporation of China |
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Application publication date: 20160309 |