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Reactive power compensation method suitable for areas where wind farms are connected

A technology of wind farm group and compensation method, applied in reactive power compensation, reactive power adjustment/elimination/compensation, wind power generation, etc., can solve problems such as incomplete sensitivity information

Inactive Publication Date: 2017-04-12
NORTHEAST DIANLI UNIVERSITY +2
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Problems solved by technology

[0003] At this stage, the research on reactive power compensation methods mainly starts from the wind farm and the inside of the wind farm, from the perspective of strong coupling between voltage and reactive power, to select weak nodes for reactive power compensation, and the application of reactive power / voltage sensitivity is also The local static voltage of grid-connected wind farms is evaluated based on the Jacobian matrix, but the sensitivity information contained in this method is not comprehensive and there are few studies on the selection of reactive power compensation points suitable for the development characteristics of wind farm groups

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  • Reactive power compensation method suitable for areas where wind farms are connected
  • Reactive power compensation method suitable for areas where wind farms are connected
  • Reactive power compensation method suitable for areas where wind farms are connected

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Embodiment Construction

[0055] The steps of the present invention are:

[0056] See attached figure 1 , The reactive power compensation method proposed by the present invention is suitable for the access area of ​​the wind farm group, the specific implementation steps are as follows:

[0057] a. The voltage correction equation of the improved wind farm:

[0058] The Jacobian matrix of the system power flow contains the sensitivity information of the injected power of each node in the system to the voltage and phase angle. In the actual power system, not all nodes are connected to the electric field or load. Therefore, in order to reduce the number of observation nodes in the system, and to avoid the influence of the existence of nodes without power injection on stability analysis, some scholars proposed to divide the nodes in the network into “injected nodes” with power injection and those with no power injection. In the analysis process, the contact node is ignored, and the “injected node reduced-order Ja...

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Abstract

The invention discloses a reactive compensation method applicable to areas accessed by wind power plant groups, and belongs to the technical field of power system analysis, operation and control. On the basis of the current condition that wind power plants massively and intensely access to power grids, supporting effect of reactive adjustment amount and far-field reactive compensation to voltages of observation points is determined through equivalent sensitivity of active increment, and a reactive compensation scheme is analyzed according to the supporting effect. The reactive compensation method includes the steps of forming of a modified wind-power-plant voltage correction equation, determination of reactive compensation points and determination of reactive compensation capacity. By the reactive compensation method, influences of volatility and randomness of wind power on determination of voltage adjustment amount are removed, calculation accuracy is improved, compensated candidate node number is increased, and system reactive adjustment is more flexible.

Description

Technical field [0001] The invention belongs to the technical field of power system analysis, operation and control. Background technique [0002] With the increasing proportion of wind power, the impact of power quality and economic dispatch in areas where large-scale wind farms are connected to the grid cannot be ignored. Among them, the reactive voltage of the wind power system is one of the most concerned issues in the grid-connected operation of wind farms. After large-scale wind power is connected to the grid, it will affect the transmission power of the line and the voltage level of the grid; disturbance factors such as wind speed changes will affect the voltage fluctuation caused by the grid connection of wind turbines. In the early stage of wind power development, since wind power accounts for a relatively low proportion of power generation in the connected area, and each wind farm has a small capacity and is at the end of the power grid, the voltage stability problem i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E10/76Y02E40/30
Inventor 王振浩李国庆陈洪涛葛津铭赵键明项福军佟辉
Owner NORTHEAST DIANLI UNIVERSITY
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