Direct-drive wind power system for wind power plant

Abstract

The invention discloses a direct-drive wind power system for a wind power plant. The direct-drive wind power system for the wind power plant comprises a single-machine infinite bus system and a grid side inverter reactive power control system. According to the direct-drive wind power system, a power-voltage curve method is used for analyzing the static voltage stability of the wind power plant, and own characteristics of a permanent magnet direct-drive machine unit are combined to control reactive power conversion between the machine unit and a power grid according to the voltage changes of the power grid through a full-power converter, so that the voltage stability of the whole wind power plant is improved; the single-machine infinite bus system is used for analyzing a voltage instability mechanism, and performing simulation for different factors after the factors which influence the voltage stability of the grid-connected wind power plant are obtained, so that a theoretical basis is added; the power-voltage curve method is used for analyzing the influence of capacity increase of the wind power plant on generatrix voltage in the whole system to obtain a stable running limit of the wind power plant; and in addition, steps are simple, and the system is convenient to operate, and has high application value.

Description

technical field [0001] The invention belongs to the technical field of new energy development, and in particular relates to a direct-drive wind power system for a wind farm. Background technique [0002] Wind energy is a renewable energy source. It is estimated that the theoretical storage capacity of wind energy on the earth is about 2.74×10 9 MW, the wind energy that can be developed and utilized is 2×10 7 MW, as long as 1% of the wind energy on the earth is used, the global energy demand can be met. Since most of the wind farms in my country are located in remote areas and the grid structure is weak, the grid connection of a large number of wind grids has brought great challenges to the power system. Most of the power grid accidents in recent years are caused by voltage instability. In the power grid including wind farms, due to the intermittent wind speed, the output of wind farms is unstable, which has brought great challenges to the stable operation of the power syst...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to use a direct-drive wind power system for wind farms, aiming to solve the problem that the wind speed changes in the existing wind farms lead to unstable active output of the wind farms, thereby affecting the voltage stability of the bus nodes in the power grid

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