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Voltage and power rise rate coordination method for three-terminal hybrid direct-current power transmission system

A hybrid DC and power transmission system technology, applied in the field of power transmission and distribution, can solve problems such as abnormal power flow, different levels, fluctuations, etc., and achieve the effect of protecting valve groups, power coordination and valve groups

Active Publication Date: 2021-03-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

However, due to factors such as measurement link or control system response error, it will be difficult to coordinate the voltage and power rise rates between the two MMC stations, and it is easy to cause abnormal power flows with different degrees between the two receiving end converter stations in the process. This phenomenon will not only cause The active power fluctuation between two MMC stations will endanger the safety of equipment in the station in serious cases

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  • Voltage and power rise rate coordination method for three-terminal hybrid direct-current power transmission system
  • Voltage and power rise rate coordination method for three-terminal hybrid direct-current power transmission system
  • Voltage and power rise rate coordination method for three-terminal hybrid direct-current power transmission system

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0020] The invention is applied to the ultra-high voltage direct current transmission system with large transmission capacity of high voltage level, especially the ultra high voltage multi-terminal hybrid direct current project, the voltage and power rising stage scene during the online input process of the valve group. The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, such as f...

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Abstract

The invention discloses a voltage and power rise rate coordination method for a three-terminal hybrid direct-current power transmission system, which is suitable for an online input process of a three-terminal hybrid direct-current power transmission system valve group, and is characterized in that a receiving terminal MMC converter station is divided into a master coordination station and a slavecoordination station, and corresponding control is respectively added to the master coordination station and the slave coordination station to correct the voltage or power rise rate in real time; andfinally, the self-discipline coordination of the rates of the converter stations is realized, so the abnormal tide phenomenon caused by imbalance of the voltages and the power rising rates of the twoMMC converter stations in the valve group input process is solved, and the effects of power coordination and valve group protection are achieved.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a method for coordinating voltage and power rise rates of a three-terminal hybrid direct current transmission system. Background technique [0002] The sending end adopts conventional DC LCC (grid commutation converter), and the receiving end adopts flexible DC MMC (modular multi-level converter) multi-terminal hybrid DC transmission system. Large power transmission capacity, low operation loss and no risk of commutation failure in MMC, high harmonic level can greatly save the area of ​​filter device and the characteristics of independent control of active and reactive power, which has a good development prospect at home and abroad. At present, the hybrid DC transmission system based on LCC-MMC is developing towards high voltage level. In order to meet the demand of high voltage, it is usually necessary to connect the DC side of two valve groups in ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/06H02J3/24H02J3/26
CPCH02J3/36H02J3/06H02J3/24H02J3/26H02J2003/365Y02E40/50Y02E60/60
Inventor 贾秀芳陆书豪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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