Inverse system robust control method for pitch-controlled wind power generation system

Abstract

The invention relates to an inverse system robust control method of a feather wind power generation system, which belongs to the wind power generation technique field, the method comprises: the electromagnetic torque of a generator is calculated according to the values of the voltage, the current and the rotating speed of the generator; if the electromagnetic torque does not reach a rated value, the rotating speed of a fan and the output power of the system are limited by increasing the electromagnetic torque of the generator; if the electromagnetic torque reaches the rated value, the pitch angle of the fan is started for adjustment, the steps are as follows: a model of the wind power generation system is established, the model is the overlapping of a nominal model and a perturbation model which is the deviation of a fan model and the nominal model; the overlapped angle of the calculated pitch angle normalized by the inverse system and the calculated robust compensation pitch angle is used for adjusting the pitch angle, thus realizing the control of the fan rotating speed and the output power of the wind power generation system. The inverse system robust control method of a feather wind power generation system of the invention has simple realization and good portability, reduces the fatigue degree of a pitch angle adjusting device and prolongs the operating life of the fan under the same wind speed condition.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, in particular to an inverse system robust control method of a variable pitch wind power generation system. Background technique [0002] With the development of wind power generation technology, variable speed variable pitch wind power generation system has been widely used. Pitch angle control is crucial to the power output of the wind power generation system. It controls the wind energy captured by the fan by directly changing the aerodynamic load of the blades, thereby controlling the output power of the wind power generation system. Especially when the wind turbine is running in a high wind speed area, the pitch angle control can limit the output power of the wind power generation system, thereby ensuring the safe operation of the generator and the converter device. [0003] The basic idea of ​​pitch angle control is to change the aerodynamic load of the blade by appropriately ...

AI Technical Summary

Problems solved by technology

[0024] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose a robust control method for the inverse system of a wind power generation system, which is suitable for the fan speed and output power control of the wind power generation system, and overcomes the traditional PID pitch The angle control method has disadvantages such as small operating range, limited control performance, difficult PID coefficient design, and weak robustness to fan parameter disturbances.

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