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Wind turbine generator system variable-pitch controller design method based on finite time robust stability

A wind turbine, time-limited technology, applied in the control of wind turbines, wind power generation, mechanical equipment, etc., can solve the problems of poor starting performance of wind turbines, large loss of wind energy, and large aerodynamic thrust of blades, etc.

Active Publication Date: 2013-01-23
国能联合动力技术(保定)有限公司
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Problems solved by technology

The advantage of this adjustment method is that the pitch adjustment mechanism is simple and the operation reliability is high, but there are disadvantages such as large wind energy loss, poor starting performance of the wind turbine, and large aerodynamic thrust on the blades.

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  • Wind turbine generator system variable-pitch controller design method based on finite time robust stability
  • Wind turbine generator system variable-pitch controller design method based on finite time robust stability
  • Wind turbine generator system variable-pitch controller design method based on finite time robust stability

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Embodiment Construction

[0027] 【Pitch adjustment principle of wind turbine】

[0028] By wind energy utilization coefficient C p =2P / ρv 3 A know that the output power generated by the wind turbine absorbing wind energy is P=Cp ρ v 3 A / 2; the wind turbine converts the generated energy into mechanical energy and transmits it to the load. The expression of mechanical energy is:

[0029] P m =Tw(1)

[0030] In the formula: P m -Mechanical energy; T-wind turbine torque; ω-wind turbine angular velocity, where the torque T is determined by the load, so it can be obtained from formula (1):

[0031] ω=ρπC p R 2 v 3 / 2T

[0032] When the wind turbine is at a certain wind speed, for a certain load, ρ, π, R are also constant, then the speed depends on the size of the wind energy utilization coefficient, then there is ω∝C p . According to the theory of blade element characteristics, the stress on the blade when the wind rotor rotates stably at a certain speed after starting is analyzed, so that the rel...

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Abstract

The invention provides a wind turbine generator system variable-pitch control method based on robust stability in finite time. The method comprises the following steps of: approximately representing a continuous time nonlinear model of a wind turbine generator system variable-pitch system by using a fuzzy T-S model; performing single-point fuzzification, product reasoning and gravity defuzzification according to the obtained fuzzy T-S model, and thus obtaining a dynamic fuzzy model; and according to the obtained dynamic fuzzy model and a finite time stability meaning, designing a variable-pitch state feedback controller of a wind turbine generator system, and controlling a pitch angle of the wind turbine generator system, the rotating speed of a wind turbine generator and the output current of the wind turbine generator system by using the obtained controller.

Description

technical field [0001] The invention relates to the pitch control of wind turbines, in particular to a control method based on finite time robust stability. Background technique [0002] Since wind energy is a random energy source, when the wind speed changes, the output power on the shaft of the wind turbine also changes accordingly. Therefore, how to adjust the output power of the wind turbine is one of the very important key technologies for the grid-connected wind turbine. At present, the power regulation methods of horizontal axis wind turbines are mainly divided into two types, that is, fixed-pitch stall regulation and variable-pitch power regulation. [0003] The basic principle of fixed-pitch stall power regulation is: using the aerodynamic characteristics of the blade itself, that is, within the rated wind speed, the lift coefficient of the blade is relatively high, and the wind energy utilization coefficient C p Also higher, and when the wind speed exceeds the ra...

Claims

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Application Information

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IPC IPC(8): G05B13/04F03D7/00
CPCY02E10/723Y02E10/72
Inventor 张磊刘卫朋张琨赵微微高惠娟穆显显王伟朋
Owner 国能联合动力技术(保定)有限公司
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