Parameter self-turning method for torque/propeller pitch controller of megawatt asynchronous double-feed wind driven generator

Abstract

The invention relates to a parameter self-turning method for a torque / propeller pitch controller of a megawatt asynchronous double-feed wind driven generator. The method comprises the following steps: after a unit is started, a yaw system firstly works to an appointed position, subsequently enters into a self-check program and enters into a free rotation process after passing through the self-check program; when the rotation speed of a generator reaches a switching speed, the blade angle of a variable pitch system is completely opened, and the speed of the generator continuously increases; when the speed of the generator reaches a grid-connection speed, a torque controller controls the rotation speed of the generator to increase according to a certain slope; and when the rotation speed of the generator reaches a rated rotation speed (rated power), a variable current controller keeps the torque of the generator constant, and a variable pitch controller controls the rotation speed of the generator to be stabilized in the rated rotation speed. The propeller pitch and torque controller comprises a PID (Proportional-Integral-Derivative) parameter self-turning controller of a BP (Back Propagation) neural network with an integral separation algorithm, the controller can automatically adjust the parameters according to rules, and the parameters are optimized through on-line training according to convergence rules, so that the power generation amount of the wind driven generator is increased, and the load of the wind driven generator is effectively reduced.

Description

technical field [0001] The invention relates to a self-tuning control method for torque / pitch control parameters of a megawatt-level asynchronous double-fed wind power generator. Background technique [0002] In recent years, my country's wind power industry has developed rapidly. By the end of 2010, the newly installed wind power capacity exceeded 16 million kilowatts, and the cumulative installed capacity exceeded 40 million kilowatts, both ranking first in the world. According to the different classifications of the selected generator forms, fans can be divided into synchronous doubly-fed models, direct-drive models and semi-direct-drive models. At the same time, doubly-fed generators have become the main type of installed capacity due to their own unique advantages, but doubly-fed wind turbines also have the problem of low wind speed application range, resulting in low power generation efficiency. [0003] At present, the torque control strategy of asynchronous doubly-...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method to solve the common problem of megawatt-level asynchronous doubly-fed wind power generators currently in use. The method for the optimal state problem

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