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Variable-pitch control method based on fuzzy feedforward and fuzzy-PI

A technology of feed-forward control and control method, which is applied in the direction of fuzzy logic algorithm, control algorithm type, wind engine control, etc., and can solve problems such as difficult to meet control requirements, reduced controller performance, and increased control difficulty of pitch control system

Inactive Publication Date: 2017-06-20
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0003] However, the wind turbine is a multi-variable, strongly coupled high-order nonlinear system, and there is still a considerable range between the rated wind speed and the cut-out wind speed, which greatly increases the difficulty of controlling the pitch control system
The traditional PID control method designed based on the linear fan model is difficult to meet the control requirements under a wide range of wind speed changes
When the fan deviates from its linearized operating point, the performance of the controller can be severely degraded

Method used

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  • Variable-pitch control method based on fuzzy feedforward and fuzzy-PI
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  • Variable-pitch control method based on fuzzy feedforward and fuzzy-PI

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[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them; based on The embodiments of the present invention and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] see Figure 1-3 , the present invention provides a technical solution: a pitch control method based on fuzzy feed-forward and fuzzy-PI, including fuzzy feed-forward control, where the wind speed v(k-1) at the previous moment is taken as the input quantity in fuzzy feed-forward control 1. The fuzzy subset is {LH(Little High), RH(Relative High), H(High), VH(Very High), SH(Super High)}, with the wind speed increment ΔV as the input 2, the fu...

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Abstract

The invention discloses a variable-pitch control method based on fuzzy feedforward and fuzzy-PI. The variable-pitch control method comprises fuzzy feedforward control and fuzzy-PI control. A proper feedforward compensation angle is provided according to the interference of the fuzzy feedforward control with the wind speed, and the feedforward compensation angle pluses an output pitch angle of the fuzzy-PI control to serve as the reference value of the pitch angle; and according to the fuzzy-PI control, the fuzzy-PI control is double-mode control composed of the fuzzy control and the PI control; and when the power change range is large, the fuzzy control is adopted, and when the power change range is small, the PI control is smoothly switched to through a nonlinear function. By the adoption of the variable-pitch control method based on the fuzzy feedforward and the fuzzy-PI, the problem that only PID control is used in a strong-nonlinearity wind power system and consequently the satisfactory control effect cannot be achieved is solved, the design difficulty of a controller is lowered, the dynamic-static feature of the system is improved, the output power of an electric generator can be quickly stabilized to be near the rated value, and the impact of wind-power integration on a grid is reduced.

Description

technical field [0001] The invention relates to the technical field of pitch control systems, in particular to a pitch control method based on fuzzy feedforward and fuzzy-PI. Background technique [0002] Due to the advantages of flexible control and low mechanical force, the variable pitch control method has been widely used in large wind turbines, and is mostly used in situations above the rated wind speed. The control method changes the wind energy utilization coefficient by adjusting the blade pitch angle (pitch angle), thereby changing the wind energy absorbed by the wind turbine from the air, so that the wind turbine can achieve constant power output. [0003] However, the wind turbine is a multivariable, strongly coupled high-order nonlinear system, and there is still a considerable range between the rated wind speed and the cut-out wind speed, which greatly increases the difficulty of controlling the pitch control system. The traditional PID control method designed ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/00
CPCF03D7/00F05B2270/32F05B2270/328F05B2270/705F05B2270/707Y02E10/72
Inventor 黄金杰贾海阳潘晓真
Owner HARBIN UNIV OF SCI & TECH
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