CN1106583A - Low frequency power transmission method - Google Patents
Low frequency power transmission method Download PDFInfo
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- CN1106583A CN1106583A CN 94101608 CN94101608A CN1106583A CN 1106583 A CN1106583 A CN 1106583A CN 94101608 CN94101608 CN 94101608 CN 94101608 A CN94101608 A CN 94101608A CN 1106583 A CN1106583 A CN 1106583A
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Abstract
The capability of AC power transmission system is mainly restricted by inductance that is proportional with frequency, so decreasing frequency raises the capacity. The low-frequency power transmission method requires less transmission lines for the same power, resulting in less investment. In addition, hydroelectric generator can generate low-frequency electricity when water level is lower, so playing its action in advance.
Description
The invention belongs to generating, power transformation or distribution technique field, further relate to the method that low frequency transmits electric power.
The current power transmission system adopts the ac transmission mode of 50HZ or 60HZ mostly.The principal element that limits its transmission capacity is the reactance X of transmission system.The limit power of transmission system can be represented with following formula approx.
The U here is the rated voltage of transmission system.In order to improve transmission capacity, always adopt the method that improves voltage U.But improve the restriction that rated voltage often is subjected to manufacture level.
Because there is not the problem of reactance in DC circuit, transmission system also had and adopted direct current transportation modern age.But the converter at DC transmission system two ends costs an arm and a leg, and makes it be difficult to extensive use.In addition, the direct current transportation mode is difficult to draw branch's power in the middle of transmission line, also is a shortcoming.
Recently in order to improve the AC transmission system characteristic, FACTS system (Flexible AC Transmission System) has appearred also.This transmission system is to utilize the electric capacity of electronic equipment control, the parameter that inductance changes transmission system, to reach the purpose that improves transmission capacity.FACTS can not increase substantially transmission capacity, and very high to the requirement of control electronics in addition, present manufacture level also is difficult to meet the demands.
Except FACTS, the transmission line of compact also is to change a kind of mode that line parameter circuit value improves the AC transmission system transmission capacity.The structure more complicated of this transmission line is moved very dumb.
The purpose of this invention is to provide a kind of method that can increase substantially the AC transmission system transmission capacity, when carrying equal-wattage, can significantly reduce the transmission line number, thereby reach the purpose of saving investment, reducing electric outgoing line corridor.The low frequency power of sending in addition can transporting water power plant construction process is to reach the purpose of bringing into play its benefit as early as possible.
Principle of the present invention is: the reactance X of AC transmission system is directly proportional with frequency f, that is: X=2 π fL (formula 2)
Wherein, L represents the transmission system inductance, and frequency reduces K doubly, under the constant fully situation of transmission line, will make reactance reduce K doubly, and therefore according to formula 1, under the constant situation of rated voltage, limit power will improve K times.
The method that low frequency of the present invention transmits electric power is made up of following process:
1, sends the low frequency electricity or send the power frequency electricity again through generally transformer 7 or branch frequency power transformer 2 become low frequency by hydraulic generator unit 6 by generating set 1;
2, low frequency power is transported to not end by transmission line 3;
3, send into power frequency electric power system 5 after by magnetic frequency tripler 4 the low frequency electricity being transformed into power frequency.
Method of the present invention as shown in Figures 1 and 2.
In the accompanying drawing 1,1 is generating set; 2 for dividing frequency power transformer, and 3 is transmission line, and 4 is magnetic frequency tripler, and 5 is the power frequency electric power system.The power frequency electric power that generating set 1 sends, through minute frequency power transformer 2 frequency is reduced to low frequency, deliver to end by transmission line 3, send into the power frequency electric power system after by magnetic frequency tripler 4 frequency being risen to power frequency, here branch frequency power transformer 2 and magnetic frequency tripler 4 are made of static ferromagnetic element or power electronic element, the advantage of static ferromagnetic element is simple in structure, and is reliable, cheap.The advantage of power electronic element is a high efficiency, and is flexible for installation.
In the accompanying drawing 2,6 is the hydraulic generator unit, and 7 is general transformer, and 3 is transmission line, and 4 is magnetic frequency tripler, and 5 is the power frequency electric power system.When generating set is hydraulic generator unit 6, divide frequency power transformer to replace by general transformer 7, hydraulic generator unit 6 can directly send low frequency power, because the rotating speed of the hydraulic turbine is lower, be suitable for sending low frequency power, the number of pole-pairs that only needs to reduce generator gets final product, for example, number of pole-pairs is reduced to 1/3, and then generator sends the electric power of 16 2/3 HZ, and this electric power can utilize better simply magnetic frequency tripler promptly to can be changed into power frequency.The low frequency power transmission system is used for the electric energy advantageous particularly in transporting water power station.In addition, huge hydroelectric station is generally away from the industrial load center, if utilize low frequency power transmission just can save the transmission line investment, economic benefit is very huge.
The general construction period of large hydropower station is longer, reaches the more than ten years, and infusion of financial resources can not get benefit in the meantime.Utilize the low frequency power transmission mode just can bring into play benefit to electric power system output electric energy in construction of hydropower stations process.Its method is when height of dam rises to a certain degree, and the hydraulic turbine sends the low frequency electricity to move less than rated speed, and powers to system with above-mentioned power transmission mode, can significantly improve the capacity of competition of water power like this.
Claims (1)
1, a kind of method that transmits electric power is characterized in that utilizing low frequency power to carry, and this method is made up of following plurality of processes:
Low frequency electricity that (1,1) sends hydraulic generator unit (6) or the power frequency electricity that sends by generating set (1) through as transformer (7) or divide frequency power transformer (2) to become low frequency;
(1,2) low frequency power is transported to not end by transmission line (3);
(1,3) send into power frequency electric power system (5) after by magnetic frequency tripler (4) the low frequency electricity being transformed into the power frequency electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94101608 CN1106583A (en) | 1994-02-03 | 1994-02-03 | Low frequency power transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94101608 CN1106583A (en) | 1994-02-03 | 1994-02-03 | Low frequency power transmission method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1106583A true CN1106583A (en) | 1995-08-09 |
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ID=5030260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94101608 Pending CN1106583A (en) | 1994-02-03 | 1994-02-03 | Low frequency power transmission method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1106583A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338839C (en) * | 2003-07-16 | 2007-09-19 | 成都希望电子研究所 | Ultralow frequency transmission system |
| CN100352123C (en) * | 2006-01-10 | 2007-11-28 | 西安交通大学 | Frequency-variable transmission system |
| CN101902130A (en) * | 2010-07-21 | 2010-12-01 | 华中科技大学 | Variable-frequency power transmission and distribution system |
| CN102192576A (en) * | 2010-03-10 | 2011-09-21 | Lg电子株式会社 | Communication apparatus, air conditioning system and communication method thereof using refrigerant pipes |
| WO2021146995A1 (en) * | 2020-01-22 | 2021-07-29 | Abb Power Grids Switzerland Ag | Apparatus and method of power transmission |
-
1994
- 1994-02-03 CN CN 94101608 patent/CN1106583A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338839C (en) * | 2003-07-16 | 2007-09-19 | 成都希望电子研究所 | Ultralow frequency transmission system |
| CN100352123C (en) * | 2006-01-10 | 2007-11-28 | 西安交通大学 | Frequency-variable transmission system |
| CN102192576A (en) * | 2010-03-10 | 2011-09-21 | Lg电子株式会社 | Communication apparatus, air conditioning system and communication method thereof using refrigerant pipes |
| US8936039B2 (en) | 2010-03-10 | 2015-01-20 | Lg Electronics Inc. | Communication apparatus, air conditioning system having the same and communication method thereof using refrigerant pipes |
| CN102192576B (en) * | 2010-03-10 | 2016-04-27 | Lg电子株式会社 | Pipeline communication system, air-conditioning system and communication means thereof |
| CN101902130A (en) * | 2010-07-21 | 2010-12-01 | 华中科技大学 | Variable-frequency power transmission and distribution system |
| CN101902130B (en) * | 2010-07-21 | 2012-08-15 | 华中科技大学 | Variable-frequency power transmission and distribution system |
| WO2021146995A1 (en) * | 2020-01-22 | 2021-07-29 | Abb Power Grids Switzerland Ag | Apparatus and method of power transmission |
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