Impeller rotating speed measuring method and system for wind generating set

Abstract

The invention provides an impeller rotating speed measuring method for a wind generating set. The impeller rotating speed measuring method includes the following steps that A, equal-frequency-domain pulse signals are generated in the impeller rotating process of the wind generating set; B, the equal-frequency-domain pulse signals generated in the step A in one rotating speed cycle are collected, the collected equal-frequency-domain pulse signals are subjected to filtering treatment, nose pulses with the frequency domain widths not meeting requirements are filtered out, effective equal-frequency pulse signals are reserved, and the number of the effective equal-frequency pulse signals is calculated; and C, the impeller rotating speed value of the wind generating set is calculated according to the number of the effective equal-frequency-domain pulse signals, obtained in one rotating speed cycle, in the step B. The invention further provides an impeller rotating speed measuring system for the wind generating set, the impeller rotating speed measuring system comprises a pulse generation device, a pulse collecting device, a pulse counting device, a frequency conversion device and a rotating speed conversion device, all of which are sequentially connected. By means of the impeller rotating speed measuring method and system for the wind generating set, the measuring precision is high, stability is good, and the defects of stall and biased rotating speeds during existing impeller rotating speed measuring are overcome.

Description

technical field [0001] The invention relates to the technical field of wind turbines, in particular to a method and system for measuring the rotational speed of an impeller of a wind turbine. Background technique [0002] With the continuous development of wind power generation, the installed capacity of wind farms is increasing year by year, and the distribution of wind farms is becoming more and more extensive. The proportion of wind power generation is increasing, and it has gradually become a conventional energy source. The high-precision measurement of the impeller speed of the wind turbine can obtain the impeller speed of the wind turbine on the one hand, and can also perform more accurate torque control based on the measured high-precision speed. Control and stability evaluation provide a reliable basis, therefore, a high-precision wind turbine speed measurement method is of great significance. [0003] Existing wind turbine speed measurement methods are mainly divid...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method and system for measuring the impeller speed of a wind power generating set with high precision and good stability, so as to overcome the shortcomings of existing measurement methods that are prone to errors due to noise interference

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