Wind power plant field-level yaw control method based on laser radar wind measuring instrument

Abstract

The invention provides a wind power plant field-level yaw control method based on a laser radar wind measuring instrument. The method comprises the following steps that wind speed data and wind direction data of the corresponding positions are measured through laser radars which are arranged in the preset positions of a wind power plant and the laser radars are arranged in preset number; the windspeed data is processed to obtain a wind power plant local single-machine wake flow model; a wake flow model of the whole wind power plant is obtained through the local wake flow model; the current yaw angle correction factors of wind turbine generator sets are calculated according to the wake flow model of the whole wind power plant; the advance wind direction information is measured through thefront-row laser radars and serves as a compensation signal for yaw of the first-row wind turbine generator set; and the wind turbine generator set yaw control is carried out on the basis of a wind direction signal of a wind speed wind indicator and a current yaw correction signal and the compensation signal. According to the control method, the measurement cost can be saved, the accuracy of the wind power plant wake flow model can be improved, and the macroscopic yaw control precision and power capture of the wind power plant are improved, the generating capacity of the wind power plant is improved, and the service life of a yaw system is prolonged.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a field-level yaw control method of a wind farm based on a laser radar anemometer. Background technique [0002] Wind power generation is one of the power generation methods with the most mature application and the best commercialization prospects in the field of renewable energy. Wind energy has the characteristics of non-stationarity, randomness, and low energy density. These characteristics lead to constant changes in wind direction and wind speed, so that wind turbines cannot always face the wind, thereby reducing the utilization efficiency of wind energy. The yaw system is a unique servo system of wind turbines. Its main function is to control the wind wheel to track the changing wind direction and improve power capture. [0003] The traditional yaw control system detects the wind direction and wind speed through the wind direction and speed sensor, an...

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Problems solved by technology

[0006] At present, although many researchers have studied the causes and characteristics of wake formation, and proposed related wake models, they are all based on historical wind measurement data.

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