Variable-speed wind turbine generator high-wind-speed section pitch angle control method

Abstract

The invention discloses a variable-speed wind turbine generator high-wind-speed-section pitch angle control method. The method comprises the steps that firstly, a system model of a variable-speed wind turbine generator is established; 2, performing order raising to obtain an extended system model of the variable-speed wind turbine generator; 3, setting a first adjustment error of the expansion system model; 4, calculating the dynamic characteristic of the first adjustment error; 5, setting a virtual control signal, and performing sliding mode processing on the virtual control signal; 6, setting a second adjustment error of the expansion system model; 7, calculating the dynamic characteristics of the second adjustment error; 8, obtaining an expansion control signal of the expansion system model; 9, obtaining an updating rule of a system parameter estimation value in the extended system model by adopting the Lyapunov principle; and 10, obtaining a controller model of the pitch angle of the high-wind-speed section of the variable-speed wind turbine generator. According to the method, the design process is simple, the robustness of the controller is good, the method has good adaptive capacity to uncertainty of system parameters, the anti-interference capacity is high, and the productivity quality of a unit can be improved.

Description

technical field [0001] The invention belongs to the technical field of control of wind power generating sets, and in particular relates to a method for controlling the pitch angle of a variable-speed wind generating set at a high wind speed section. Background technique [0002] As the world's population continues to increase, the contradiction between socio-economic development and resource shortages is increasingly intensified. Under this background, all countries in the world are vigorously developing wind power, making the penetration rate of wind power gradually increase. However, the increasing wind power penetration rate has brought great uncertainty to the grid and affected the stability of the grid. In the case of sufficient wind resources, how to maintain the power generated by the wind power generation system near the rated value so as to provide high-quality electric energy for wind power grid connection is an urgent and challenging issue. [0003] In recent ye...

AI Technical Summary

Problems solved by technology

The controller commonly used in the current industry is PID or variable gain PID pitch angle controller. Since the wind turbine is a system with a large working area, when the working point of the system is constantly switched, the adjustment effect of this type of control is poor.

In order to overcome this shortcoming of the PID controller, researchers successively proposed nonlinear pitch angle controllers such as neural network-based pitch angle controllers, model predictive pitch angle controllers, and fuzzy logic pitch angle controllers. However, , in order to cope with the non-affine characteristics of wind power systems, such nonlinear controllers generally have a complex design process, and few controllers pay attention to the uncertainty of system damping parameters, which leads to the fact that in practical applications, the controller's Poor adjustment effect of constant speed and constant power

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