Sampling frequency selection method of wind turbine hydraulic pitch change system

A sampling frequency, wind turbine technology, applied in the field of sampling frequency selection of wind turbine hydraulic pitch system

Inactive Publication Date: 2015-12-23
TONGJI UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for selecting the sampling frequency of the wind turbine hydraulic pitch system based on the principle

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  • Sampling frequency selection method of wind turbine hydraulic pitch change system
  • Sampling frequency selection method of wind turbine hydraulic pitch change system
  • Sampling frequency selection method of wind turbine hydraulic pitch change system

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0057] A method for selecting the sampling frequency of a wind turbine hydraulic variable pitch servo system based on the principle of fragility of the present invention comprises the following steps:

[0058] Step (1): According to the dynamics, flow continuity and other equations, describe the mathematical relationship of the wind turbine hydraulic variable pitch servo system, and determine the system mechanism model;

[0059] Step (2): Obtain the model of each functional link of the hydraulic variable pitch servo system of the wind turbine through the performance parameters of the displacement sensor, servo amplifier and driver, servo valve and hydraulic cylinder;

[0060] Step (3): Combining the mechanism model of the system in step (1) and the models of each functional link in step (2), obtain the model parameters of the wind turbine hydra...

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Abstract

The invention discloses a sampling frequency selection method of a wind turbine hydraulic pitch change system. The method comprises the following steps: 1) the vulnerability of an analog system to be digitally processed is verified by combining with a mechanism model of a wind turbine hydraulic pitch change servo system through a continuous time analog domain magnitude-frequency characteristic analysis method to guarantee the effectiveness of subsequent digital system stability design; 2) a system discrete time frequency domain analysis model is built based on a sampling frequency 1/T according to the system digital z conversion and the bilinear w conversion; 3) an optimal sampling frequency section is obtained by a MATLAB tool according to an optimal vulnerability phase margin section and the system discrete time frequency domain analysis model; and 4) top and bottom limitations of the obtained optimal sampling frequency section are substituted into the system discrete time domain frequency analysis model to verify the digital system vulnerability design. As a proper PLC sampling unit is selected, the effective cost control is realized, the system oscillation caused by frequent or lag sampling is prevented, and the system operation stability and reliability are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of wind turbine hydraulic systems, and relates to a sampling frequency selection method for a wind turbine hydraulic variable pitch system based on the principle of system vulnerability. Background technique [0002] The operating environment of the hydraulic control system of a type of wind turbine is relatively special, the geographical location is remote, the maintenance is difficult, and the failure loss is large, so objectively it should have higher stability. [0003] Vulnerability refers to the lack of necessary adaptability and robustness when the external environment changes due to the system's inherent weaknesses or loopholes, resulting in system performance degradation or even failure. Usually, the stability of the system can be judged by the phase margin, and the vulnerability of the system can be quantified by the phase margin; the larger the phase margin, the stronger the vulnerability of the s...

Claims

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Application Information

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IPC IPC(8): F03D7/00F15B19/00
CPCY02E10/72
Inventor 岳继光刘志刚
Owner TONGJI UNIV
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