Multi-terminal flexible direct current power transmission system adaptation droop control method

A DC transmission system, multi-terminal flexible technology, applied in the direction of power transmission AC network, etc., can solve the problems of DC voltage control deviation, poor flexibility and economy, and difficulty in selecting the parameters of the converter station controller.

Active Publication Date: 2016-12-21
STATE GRID CORP OF CHINA +4
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Problems solved by technology

However, this control method will bring problems such as DC voltage control deviation and difficulty in selecting parameters of the converter station controller.
Due to the fixed droop coefficient, the traditional droop control has poor flexibility and economy under complex working conditions

Method used

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  • Multi-terminal flexible direct current power transmission system adaptation droop control method
  • Multi-terminal flexible direct current power transmission system adaptation droop control method
  • Multi-terminal flexible direct current power transmission system adaptation droop control method

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Embodiment Construction

[0032] The present invention is described in detail below in conjunction with accompanying drawing:

[0033] In order to enable the droop coefficient to be adjusted in real time as the operating conditions of the system change, by detecting the DC voltage deviation and the power deviation of the converter station, such as figure 1 The shown fuzzy reasoning method determines the droop coefficient, wherein the power margin of the converter station is characterized by the difference between the actual transmission power of the converter station and the power command, and the larger the power deviation is, the smaller the margin of the converter station is. Sufficient power margin indicates that the difference between the actual transmission power of the converter station and the power command is small enough to meet the requirements set by the system.

[0034] The input of the fuzzy logic reasoning controller designed by the present invention is the DC voltage deviation and the p...

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Abstract

The invention discloses a multi-terminal flexible direct current power transmission system adaptation droop control method. The method comprises the following steps of taking a system direct current voltage deviation and a convertor station power deviation as input variables respectively; taking a droop control coefficient as an output variable; and using a fuzzy logic reasoning method to adjust the droop coefficient in real time so that the droop coefficient is adjusted in real time along with changes of a system operation condition. The method possesses the following advantages that according to the system operation condition, a convertor station direct current voltage deviation and a power margin are detected and the droop coefficient is adjusted in real time so that the system can guarantee control precision of a direct voltage when a convertor station power margin is large; and when the convertor station power margin is small and a maximum transfer capability is approached, a power distribution characteristic is guaranteed to be good.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to a coordinated control strategy for the operation of a multi-terminal flexible direct current transmission system, in particular to an adaptive droop control method for a multi-terminal flexible direct current transmission system suitable for grid-connected offshore wind power. Background technique [0002] Large-scale offshore wind farms will become the main source of clean energy in the future. Offshore wind farms are often characterized by long distances from the shore and wide distribution. Since the direct current transmission technology is not limited by the transmission distance, especially the high voltage direct current transmission system based on the voltage source converter has the characteristics of independent control of active power and reactive power, and does not require the reactive power support of the sending end grid. One of the key technologies f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
Inventor 徐进金逸韦古强张文阚芝南
Owner STATE GRID CORP OF CHINA
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