A Kalman filter-based independent pitch load control method

Abstract

A method for controlling independent pitch loads based on Kalman filtering, comprising the steps of: (a) obtaining the load on the blade root of the pitch system, and performing dq coordinate transformation to generate the load component of the d-q axis; (b) passing the Kalman load The deviation component of the load component of the d-q axis after controller optimization generates the expected pitch angle component of the d-q axis through the Kalman load controller, and obtains the expected pitch angle component through the inverse transformation of the dq coordinates; (c) obtain the wind power The actual rotational speed and output power of the system are generated by the multivariable controller to generate the unified pitch angle expected value βcol and the torque expected value Γar; (d) the unified pitch angle expected value is added to the expected pitch angle component respectively to obtain the final pitch angle expected value, It acts on the independent pitch mechanism corresponding to each blade to realize the independent pitch control of the wind power system. The invention can improve the prediction accuracy of the d-q axis load component, thereby improving the control result; at the same time, it improves the control accuracy of the pitch angle of the wind power system, and provides a valuable reference scheme for wind power pitch change.

Description

technical field [0001] The invention relates to a control method of a wind power pitch system, in particular to a Kalman filter-based independent pitch load control method, which belongs to the technical field of wind power control. Background technique [0002] With the continuous increase of wind energy utilization rate, the rapid development of wind power industry and the continuous increase of installed capacity, the load imbalance and blade fatigue caused by wind shear effect and tower shadow effect have become important issues that cannot be ignored. When the wind speed is above the rated value, in order to output constant power, it is necessary to adopt the pitch adjustment method, and the common pitch adjustment method is now commonly used. However, with the continuous increase of the scale of wind turbines, the severe imbalance of the load on the wind rotor will lead to fatigue or even damage to the blades. Therefore, independent pitch control technology has gradual...

AI Technical Summary

Problems solved by technology

However, there are often unknown or uncertain time-varying disturbances in the operation or control of the wind power system, which will have a great impact on the operation and control of the wind power system, and in severe cases will reduce the operating efficiency or even cause failures

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