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

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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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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