A wind turbine pitch control method for suppressing wind speed fluctuation interference
A technology for wind turbines and wind speed fluctuations, which is applied in the control of wind turbines, engine control parameters, wind turbines, etc. It can solve the problems that the PID controller is difficult to meet the control requirements, and achieve the effect of eliminating interference and reducing jitter problems
Active Publication Date: 2019-12-31
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology
[0003] Due to the time-delay and nonlinear characteristics of wind turbines, conventional PID controllers are difficult to meet the control requirements. In order to improve control accuracy and system stability, many scholars have conducted in-depth research on this problem and proposed many solutions.
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[0056] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.
[0057] The technical scheme that the present invention solves the problems of the technologies described above is:
[0058] 1) Linearize the wind turbine model and design the control rate
[0059] Wind turbines convert wind energy into mechanical energy, according to Betz theory of aerodynamics [2] It can be seen that:
[0060] P a =0.5ρπR 2 C p (λ,β)V 3 (1)
[0061] In the formula: P a is the power absorbed by the fan impeller; ρ is the air density; R is the radius of the fan impeller; C p is the wind energy utilization coefficient when capturing wind energy, which is a function of λ and β; V is the actual wind speed; β is the pitch angle of the fan; λ is the blade tip speed ratio, which is a fu...
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The invention requests to protect a wind turbine generator pitch control method for inhibiting wind speed fluctuation interference and relates to the field of pitch control of wind power generation. Firstly, a wind turbine generator is linearized at a constant-power point above a rated wind speed for preventing a control chaos effect caused by non-linearization of the wind turbine generator; meanwhile, a traditional PID controller barely reaches a satisfactory effect in power precision control, so a sliding mode controller is designed; secondly, a method for predicting and compensating the wind speed fluctuation interference is adopted for solving the problem about shaking appearing in a control process due to sliding mode control; and finally, for solving a time delay effect caused by large inertia of the wind turbine generator in the control process, a Kalman filter and a Newton-Raphson algorithm are utilized for predicting an effective wind speed so as to compensate a pitch angle. The control method provided by the invention can commendably reduce shake of the sliding mode, can increase the response speed of a system, can also commendably realize stable power output and has a certain practical value.
Description
technical field [0001] The invention belongs to the field of pitch control of wind power generation, and specifically relates to a pitch control method for controlling the output power of a wind turbine. The method is based on suppressing wind speed fluctuation interference and stabilizing output power of a wind turbine. Background technique [0002] Due to the green and sustainable advantages of renewable energy, it has attracted a lot of attention from all over the world. Wind power generation is a very important renewable energy source, and its installed capacity accounts for an important proportion of power consumption. Therefore, it is of great significance to improve the quality of power generation. Above the rated wind speed, the output power must be kept constant. Pitch control technology is one of the important means to keep the output power constant [1-2] . [0003] Due to the time-delay and nonlinear characteristics of wind turbines, conventional PID controller...
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Login to View More IPC IPC(8): F03D7/04
CPCF03D7/0224F03D7/04F05B2260/8211F05B2260/84F05B2270/32Y02A30/00Y02E10/72
Inventor 任海军张浩侯斌邓广周桓辉张萍雷鑫
Owner CHONGQING UNIV OF POSTS & TELECOMM