Voltage stabilization analyzing method and device for power system of wind power plant

Abstract

The embodiment of the invention provides a voltage stabilization analyzing method and device for a power system of a wind power plant. The method comprises: selecting continuous parameters to form a new equation, expanding the flow equation of the power system by using the new equation, correcting the expanded flow equation of the power system to obtain corrected flow equation of the power system, wherein in the corrected flow equation of the power system, the corrected flow jacobian matrix is the flow jacobian matrix generated when the node in the power system with maximum reduced voltage amplitude value is processed as the node with appointed injection power and voltage amplitude value; using a Newton-Raphson algorithm iteration to solve the corrected flow equation of the power system so as to obtain a prediction direction; determining a predication point according to the prediction direction and a preset step size; and analyzing the voltage stabilization condition of the power system of the wind power plant according to the prediction point. According to the scheme of the invention, the convergence of the continuous flow calculation nearby the critical point is greatly improved; and the reliability of the algorithm is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electric power safety, in particular to a voltage stability analysis method and device for a wind farm power system. Background technique [0002] The reactive power characteristics of the wind farm are related to the active power characteristics of the wind farm. When the active output of the wind farm is low, the transmission line is lightly loaded, and the reactive power of line charging is excessive, the wind turbine should absorb reactive power. If the reactive power absorbed by the wind turbine is insufficient, the wind farm will inject reactive power into the grid, and high voltage problems may occur. When the active power output of the wind farm increases, the transmission line is overloaded, and the inductive reactive power consumed increases accordingly. The reactive power charged by the line is not enough to offset the inductive reactive power consumed by the line and main transformer and othe...

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Problems solved by technology

[0005] The embodiment of the present invention provides a voltage stability analysis method of a wind farm power system to solve the technical problems in the prior art that the convergence of the continuous power flow calculation near the critical point is difficult to be effectively guaranteed and the reliability of the algorithm is greatly affected

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