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Flexible half-wave transmission system and its tuning method based on power electronic commutation technology

A technology for power electronics and power transmission systems, which is applied in the field of power transmission systems to achieve the effects of strong competitiveness, good voltage stability and excellent economy.

Active Publication Date: 2018-08-14
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The frequency conversion flexible tuning device is based on the principle of power electronic frequency conversion, and constructs a frequency conversion half-wave transmission system by adjusting the transmission frequency to solve the problem of ultra-long-distance power supply in remote areas
The synchronous compensation type flexible tuning device is based on the synchronous compensation principle of the power electronic converter, and constructs a synchronous compensation type half-wave transmission system by adjusting the equivalent electrical distance of the transmission line to solve the problem of ultra-long-distance transcontinental and transnational power transmission

Method used

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  • Flexible half-wave transmission system and its tuning method based on power electronic commutation technology
  • Flexible half-wave transmission system and its tuning method based on power electronic commutation technology
  • Flexible half-wave transmission system and its tuning method based on power electronic commutation technology

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Embodiment 1

[0052] A flexible half-wave power transmission system based on a frequency-division tuning device provided by the present invention includes a sending-end variable-frequency flexible tuning device, a receiving-end variable-frequency flexible tuning device, a tuned transmission line, and a sending-end AC system and a receiving-end AC system . The variable-frequency flexible tuning device is connected in series between the AC system at the sending end and the transmission line, and between the AC system at the receiving end and the transmission line.

[0053] to tune transmission line length For example, to achieve half-wavelength power transmission, the frequency of the electromagnetic wave on the transmission line is raised to 2f through a frequency conversion tuning device at the sending end, and the frequency of the AC system flowing into the receiving end is reduced to f through a frequency conversion tuning device at the receiving end. In this way, the equivalent electri...

Embodiment 2

[0055] A flexible half-wave power transmission system based on a synchronous compensation tuning device provided by the present invention includes a sending-end synchronous compensation tuning device, a receiving-end synchronous compensation tuning device, a tuned transmission line, a sending-end AC system, and a receiving-end AC system.

[0056] The Π-type tuning device is composed of a static series synchronous compensator SSSC and a static var compensator STATCOM, which are connected in series between the AC system at the sending end, the AC line, and the AC system at the receiving end.

[0057] to tune transmission line length For example, to achieve half-wavelength power transmission, the tuning devices at the sending and receiving ends need to compensate The equivalent capacitance and reactance of the electrical length, the compensation of the tuning devices at the sending and receiving ends electrical length.

[0058] In the Π-type tuning device at the sending and ...

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Abstract

The invention relates to a flexible half-wave power transmission system based on a power electronic commutation technology and a tuning method of the system. The power transmission system comprises a long-distance power transmission line and a power transmission line flexible tuning device, wherein the flexible tuning device comprises a frequency conversion type flexible tuning device and a synchronous compensating type flexible tuning device; the frequency conversion type flexible tuning device is used for constructing a frequency conversion type half-wave power transmission system by adjusting the power transmission frequency on the basis of a power electronic frequency conversion principle and the synchronous compensating type flexible tuning device is used for constructing a synchronous compensating half-wave power transmission system by adjusting the equivalent electrical distance of the power transmission line on the basis of a synchronous compensating principle of a power electronic inverter. Half-wave power transmission has the advantages of far transmission distance, good voltage stability at first and tail ends, infinitely great theory limit of transmitting power, no reactive compensation devices and intermediate switching stations and the like. The economical benefit of half-wave power transmission is even superior to that of direct-current transmission, and the flexible half-wave power transmission system is particularly suitable for point-to-point, high-capacity and ultra-long distance power transmission and distribution and has strong competitiveness on transcontinental and transnational power transmission and power supply for remote regions.

Description

technical field [0001] The invention relates to a power transmission system and a method thereof, in particular to a flexible half-wave power transmission system based on power electronic commutation technology and a tuning method thereof. Background technique [0002] In the context of global energy interconnection, in order to effectively solve the serious imbalance between the distribution of global energy resources and market demand, the centralized and large-scale development of Arctic wind energy and equatorial solar energy, as well as transcontinental and transnational long-distance transmission and distribution have become an inevitable trend. Traditional AC transmission is restricted by transmission power limit, reactive voltage control, system safety and stability and other factors, and has been unable to adapt to ultra-long-distance power transmission. As a point-to-point, ultra-long-distance, large-capacity power transmission technology solution, half-wave power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 周飞拜润卿荆平
Owner STATE GRID CORP OF CHINA
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