CN113595076A - Novel long-distance power transmission method - Google Patents
Novel long-distance power transmission method Download PDFInfo
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- CN113595076A CN113595076A CN202110905320.1A CN202110905320A CN113595076A CN 113595076 A CN113595076 A CN 113595076A CN 202110905320 A CN202110905320 A CN 202110905320A CN 113595076 A CN113595076 A CN 113595076A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention belongs to the field of electric energy transmission, and relates to a novel long-distance power transmission method. Two ends of an approximate half-wavelength alternating current transmission line are connected with an alternating current system respectively, and other parts of the line are connected with other alternating current systems, so that the stability of the long-distance transmission power of the alternating current transmission system is improved. The approximate half-wavelength alternating current transmission line can be formed by connecting a plurality of transmission lines in an equivalent mode. In actual engineering, the existing power transmission networks are combined and connected to form an approximate half-wavelength power transmission line, and the potential of improving the stability of a long-distance alternating current power transmission system is achieved.
Description
Technical Field
The invention belongs to the field of electric energy transmission, and relates to a novel long-distance power transmission method.
Background
The vast width of our country, the energy base is mainly distributed in the western region, the load center is mainly distributed in the eastern region, and along with the rapid development of economy, the large-capacity long-distance electric energy transmission is needed. Alternating current transmission is a traditional power transmission mode, has the advantages of convenience in voltage transformation and mature technology, and is widely used up to now.
However, the problem of stable power limit exists in alternating current long-distance transmission, and when the length of a line is less than 0.25 times of wavelength (the frequency is 50Hz, and the overhead line with the wavelength of 0.25 times is about 1500km), the longer the line is, the smaller the stable power limit is.
The length of the transmission line is between 0.25 times of wavelength and half wavelength (the frequency is 50Hz, and the half wavelength overhead line is about 3000km), and the longer the transmission distance is, the larger the stable power limit is neglected.
Disclosure of Invention
The invention provides a novel long-distance power transmission method, which improves the stability of long-distance power transmission by means of a half-wave line.
Two ends of an approximate half-wavelength transmission line are connected with two alternating current power systems, and other parts of the transmission line can be connected with other alternating current power transmission systems, so that the long-distance stable transmission of electric energy between the connected systems is realized.
If the other alternating current transmission system is an energy base, the other alternating current transmission system is just positioned at the middle point of the half-wavelength transmission line, and the distance between the other alternating current transmission system and the alternating current systems at the two ends is 0.25 times of the wavelength. Thus, if one side is connected alone, the output power of the middle system is difficult to stabilize; and meanwhile, the two side systems are connected, so that the middle alternating current system can stably transmit more power. Of course, the number of the additional communication systems may be several, and the access point is not necessarily at the middle point.
Theoretically, if an overhead line with 0.25 times wavelength is used, one end of the overhead line is connected with an alternating current system of an energy base, the other end of the overhead line is connected with an alternating current system of a load center, and the middle of the overhead line is not connected with other systems, stable power transmission is difficult.
In practical engineering, there are usually many AC lines for transmitting power from energy base, and two of them may be combined to form an approximate half-wavelength transmission line. The existing power transmission networks are combined and connected, so that the potential of improving the stability of a long-distance alternating current power transmission system is realized.
The invention has the beneficial effects that: the stability of the long-distance power transmission of the alternating current system is improved.
Drawings
Fig. 1 is a simulation diagram of the novel long-distance power transmission method of the present invention, wherein the systems 1, 2 and 3 are simple three-phase ac systems with three generators connected in parallel with a resistor and the frequency is 50 Hz; 4 is an approximate half-wavelength overhead line with the length of 3000 km; 5 is a 4-middle-led connecting line with negligible length; 4. 5 are all three phases.
Detailed Description
The embodiments are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the present invention proposes a novel long-distance power transmission method. Connecting the systems 1 and 2 by two ends of a line with approximate half wavelength; the system 3 is coupled with the intermediary of wires. This enables a stable power transfer between the systems 1, 2, 3.
Taking the above figures as examples, when the output powers of the synchronous generators in the systems 1, 2 and 3 are the same, the parallel resistances of the systems 1, 2 and 3 are respectively adjusted to 2500 Ω, 3000 Ω and 300 Ω, and the output powers of the systems 1 and 2 to 3 can reach a stable value of 157.5 MW; and the resistances in the three systems 1, 2 and 3 are respectively adjusted to 750 Ω, 500 Ω and 3000 Ω, so that the power value output by the systems 1 and 2 to 3 is-127.3 MW, that is, the system 3 transmits power to the systems 1 and 2 to be-127.3 MW. When system 1 is disconnected, systems 2 and 3, which are approximately 0.25 times the wavelength apart, cannot stably transmit power.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A novel long-distance power transmission method is characterized in that: two ends of an approximate half-wavelength alternating current transmission line are connected with an alternating current system respectively, and other parts of the line are connected with other alternating current systems, so that the stability of the long-distance transmission power of the alternating current transmission system is improved.
2. The method of claim 1 wherein the approximately half-wavelength ac transmission line is formed by connecting several transmission lines in an equivalent manner.
3. The long distance power transmission method of claim 1 wherein the total length of the approximately half wavelength power transmission line is greater than 0.4 wavelengths.
4. The method of claim 1, wherein the other parts of the line and the junction of the ac system are located at the right middle of the line or at other positions; either at one point or at multiple points, with multiple communication systems.
5. A method according to claim 1, characterized in that the further ac system is either a system with or without a power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110905320.1A CN113595076A (en) | 2021-07-31 | 2021-07-31 | Novel long-distance power transmission method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110905320.1A CN113595076A (en) | 2021-07-31 | 2021-07-31 | Novel long-distance power transmission method |
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| Publication Number | Publication Date |
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| CN113595076A true CN113595076A (en) | 2021-11-02 |
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| CN202110905320.1A Pending CN113595076A (en) | 2021-07-31 | 2021-07-31 | Novel long-distance power transmission method |
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Citations (7)
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|---|---|---|---|---|
| CN101383510A (en) * | 2008-10-28 | 2009-03-11 | 李晓明 | Device and method for electricity energy transmission by high-voltage transmission line |
| CN106130021A (en) * | 2016-06-23 | 2016-11-16 | 全球能源互联网研究院 | A kind of flexible tuner of T-shaped mixing |
| CN107240911A (en) * | 2017-06-29 | 2017-10-10 | 中国电力科学研究院 | A kind of half-wave power transmission route protection collocation method and device |
| CN108107268A (en) * | 2017-11-14 | 2018-06-01 | 全球能源互联网研究院有限公司 | A kind of transmission line of alternation current harmonic propagation characteristic analysis method |
| CN109145337A (en) * | 2017-06-28 | 2019-01-04 | 中国电力科学研究院 | A kind of modeling method and system of half-wavelength ac transmission dynamic simulator system |
| CN109842101A (en) * | 2017-11-29 | 2019-06-04 | 中国电力科学研究院有限公司 | The over-voltage protection method and device of half-wavelength ac transmission dynamic simulator system |
| CN111564864A (en) * | 2020-05-21 | 2020-08-21 | 北方工业大学 | Half-wavelength alternating current transmission system, tuning method thereof and flexible grid connection method |
-
2021
- 2021-07-31 CN CN202110905320.1A patent/CN113595076A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383510A (en) * | 2008-10-28 | 2009-03-11 | 李晓明 | Device and method for electricity energy transmission by high-voltage transmission line |
| CN106130021A (en) * | 2016-06-23 | 2016-11-16 | 全球能源互联网研究院 | A kind of flexible tuner of T-shaped mixing |
| CN109145337A (en) * | 2017-06-28 | 2019-01-04 | 中国电力科学研究院 | A kind of modeling method and system of half-wavelength ac transmission dynamic simulator system |
| CN107240911A (en) * | 2017-06-29 | 2017-10-10 | 中国电力科学研究院 | A kind of half-wave power transmission route protection collocation method and device |
| CN108107268A (en) * | 2017-11-14 | 2018-06-01 | 全球能源互联网研究院有限公司 | A kind of transmission line of alternation current harmonic propagation characteristic analysis method |
| CN109842101A (en) * | 2017-11-29 | 2019-06-04 | 中国电力科学研究院有限公司 | The over-voltage protection method and device of half-wavelength ac transmission dynamic simulator system |
| CN111564864A (en) * | 2020-05-21 | 2020-08-21 | 北方工业大学 | Half-wavelength alternating current transmission system, tuning method thereof and flexible grid connection method |
Non-Patent Citations (1)
| Title |
|---|
| 王华昕等: "交直流混联式三端半波长输电拓扑结构", 《电网技术》 * |
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Application publication date: 20211102 |