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A Coordination Method of Voltage and Power Rise Rate in Three-terminal Hybrid DC 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, difficult coordination of voltage and power rise rates, etc., and achieve the effect of protecting valve groups, power coordination and valve groups

Active Publication Date: 2022-05-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

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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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  • A Coordination Method of Voltage and Power Rise Rate in Three-terminal Hybrid DC 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] The present invention is applied to UHV DC power transmission systems with large high-voltage level transmission capacity, especially UHV multi-terminal hybrid DC projects, and the voltage and power rising stage scene in the process of putting valve groups online. The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 As shown, it is a flow chart of a DC v...

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Abstract

The invention discloses a three-terminal hybrid direct current transmission system voltage and power rising rate coordination method, which is suitable for the online input process of the valve group of the three-terminal hybrid direct current transmission system, by dividing the receiving end MMC converter station into a master coordination station and a slave coordination station stations, respectively add corresponding controls to correct their voltage or power rise rates in real time, and finally realize the self-discipline coordination of the rates of each converter station, thereby solving the problem of voltage and power rise rates of the two MMC converter stations in the process of valve group commissioning. The abnormal power flow phenomenon caused by unbalance plays the role of power coordination and protection of the valve group.

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 multi-terminal hybrid DC transmission system adopts conventional DC LCC (grid commutated converter) at the sending end and flexible DC MMC (modular multilevel converter) at the receiving end. Larger transmission capacity, lower operating loss, no risk of commutation failure in MMC, higher harmonic level can greatly save the area occupied by the filter device and independent control of active and reactive power, and has good development prospects at home and abroad. At present, the hybrid DC transmission system based on LCC-MMC is developing towards high voltage levels. In order to meet the high voltage requirements, it is usually necessary to connect two valve groups in series on the DC side of each pol...

Claims

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Application Information

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Patent Type & Authority Patents(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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