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Flexible direct-current offshore converter station based on 66kV collection access, system and control method

A technology of flexible DC and control methods, which is applied in the direction of conversion equipment for intermediate conversion to DC, output power conversion devices, and power transmission AC networks. It can solve problems such as high cost and volume, and save investment and maintenance costs. Effect

Pending Publication Date: 2021-11-09
TBEA XIAN FLEXIBLE TRANSMISSION & DISTRIBUTIONCO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its high cost and large size are the main factors restricting the application of MMC converters in offshore direct current transmission.

Method used

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  • Flexible direct-current offshore converter station based on 66kV collection access, system and control method
  • Flexible direct-current offshore converter station based on 66kV collection access, system and control method
  • Flexible direct-current offshore converter station based on 66kV collection access, system and control method

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Embodiment 2

[0038] image 3 A block diagram of the control method of the soft direct converter valve is given, where V aref , V bref and V cref are three-phase fundamental frequency modulated waves output by centralized control, V 3ref is the third harmonic voltage injection value, θ is the phase-locking angle of the fundamental frequency voltage, V arefmax is the peak value of the fundamental frequency modulation wave voltage of phase A, V ref_A , V ref_B , V ref_C is the final modulating wave, I d2 is the d-axis component of the circulation in the bridge arm of the MMC, I d2ref Given value for the d-axis component of the circulation in the bridge arm of the MMC, I q2 is the q-axis component of the circulation in the bridge arm of the MMC, U dc is the DC voltage, E diffA ,E diffB ,E diffC Respectively for the circulation injection control output value

[0039] A method for controlling a soft DC converter valve, comprising the following steps:

[0040] S1, subtract the circu...

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Abstract

The invention discloses a 66kV collection access-based flexible direct-current offshore converter station, a system and a control method, and the flexible direct-current offshore converter station is characterized in that the offshore converter station comprises a connection transformer, a flexible direct-current converter valve and a bridge arm reactor, wherein the primary side of the connection transformer is connected with a bus bar of an offshore wind plant; the primary side is connected with the input end of the flexible direct current converter valve, the output end of the flexible direct current converter valve is connected with the first end of the bridge arm reactor, and the second end of the reactor is connected with the direct current submarine cable. And the investment and maintenance cost of an offshore booster station is saved. By increasing control strategies, increasing module voltage, reducing the total number of converter valve modules, reducing capacitance value, improving transmission capacity of equipment and reducing size and weight of an offshore wind power plant, the problems of land occupation, large load, high cost and the like of an offshore converter station can be effectively solved, technical cost of engineering implementation is remarkably reduced, and the method is suitable for large-scale popularization and application. The method has better economical efficiency and is of great significance to large-scale development and utilization of offshore wind power.

Description

technical field [0001] The invention belongs to the technical field of offshore wind power and flexible direct current transmission, and specifically relates to a flexible direct current offshore converter station, system and control method based on 66kV converging access. Background technique [0002] With the proposal of building a new power system with new energy as the main body under the double carbon target, new energy represented by solar energy and wind energy will gradually replace fossil energy. The report "China's 2050 High Proportion of Clean Energy Development Scenario and Pathway Research" pointed out that by 2050, more than 85% of China's electricity demand and more than 60% of primary energy demand will be met by renewable energy. As an important renewable energy, wind energy has a considerable amount. Several wind energy-rich belts in my country are mainly distributed in the southeast coastal areas, the "Three North" areas, and some inland areas. Although t...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38H02J3/01H02M5/42H02M1/08H02M1/12
CPCH02J3/36H02J3/38H02J3/01H02M5/42H02M1/08H02M1/12H02J2300/28Y02E10/76Y02E40/40Y02E60/60
Inventor 赵玲张军刘汉军盛俊毅
Owner TBEA XIAN FLEXIBLE TRANSMISSION & DISTRIBUTIONCO
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