Nonlinear economic model prediction control method applied to fan

Abstract

The invention discloses a nonlinear economic model prediction control method applied to a fan. Firstly, the mechanism modeling is performed based on a fan principle; a generator rotor angle speed, a wind wheel rotor angle speed, a shaft twisting angle, a tower offset and a tower deviation speed are selected as state quantities of a fan model; a generator torque and a pitch angle are used as control quantities of the fan model; the generator rotor angle speed and a generator power are used as outputs of the fan model; a fan nonlinear model is expressed in a state space equation form; then, a nonlinear prediction model of the fan is dispersed; representative economic indexes are selected to form economic target functions to embody economic performances of a wind power generation system; constraint conditions of the state quantities, the control quantities and the outputs are set; and finally, optimization functions are used for solution to obtain an optimal control quantity. The method solves the problems of weak tracking prediction control effect and difficult achievement of the economy in the prior art.

Description

technical field [0001] The invention belongs to the field of energy technology, and in particular relates to a nonlinear economic model predictive control method applied to wind turbines. Background technique [0002] Today's wind power generation technology relies on wind turbines to achieve. A wind turbine is an energy conversion device that converts the kinetic energy of the wind into different forms of electrical energy. At present, there are four types of wind turbines: constant speed and fixed pitch, constant speed and variable pitch, variable speed and fixed pitch, and variable speed and variable pitch. Fixed pitch means that the blades of the fan are rigidly connected to the hub, and the pitch angle of the fan remains unchanged. The variable pitch is a flexible connection, and the pitch angle of the blade is allowed to change. Fixed-pitch fans and variable-pitch fans are different in blade design. The design of the blades of the fixed-pitch fan has stall characte...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a nonlinear economic model predictive control method applied to wind turbines, which solves the problems in the prior art that the effect of tracking predictive control is not good and it is difficult to achieve economical efficiency

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