Comprehensive method for vector or direct torque control of permanent magnetism type wind generator

Abstract

The present invention relates to a comprehensive method for vector or direct torque control of a permanent magnetism type wind generator, and belongs to a comprehensive method which uses the vector control when the permanent magnetism type wind generator is at a stable operation state and uses the direct torque control when the permanent magnetism type wind generator is in a wind power generating transient state. The comprehensive method mainly solves the technical problems existing in the prior wind generator vector method that the transient swing is hard to control due to the sudden change of wind force. The technical proposal comprises the following steps: a) establishing a vector control mathematical model of the permanent magnetism type wind generator in the stable operation state, due to the control of component voltage and current on the d and q axes by pulse width modulation (PWM), controlling the AC exciting current frequency of the permanent magnetism type wind generator by a grid electrode of a bipolar triode switch of a corresponding isolated gate in an adjusting converter, and realizing the control of the permanent magnetism type wind generator in a stable wind state; and b) in the wind power generating transient process, using the permanent magnetism type wind generator controlled by the method of the direct torque control of the permanent magnetism type wind generator (WGDTC).

Description

technical field [0001] The invention relates to a comprehensive vector and direct torque control method of a permanent magnet wind power generator, which belongs to a permanent magnet wind power generator that uses vector control in a stable operating state and uses direct torque control in the transient process of wind power generation comprehensive approach. Background technique [0002] As we all know, wind power is the cheapest, most promising and inexhaustible green energy among renewable energy sources. At present, variable-speed constant-frequency permanent magnet wind turbines are regarded as a mainstream type of wind turbines at home and abroad. When the generator set is running in a steady state, the traditional vector control method has an ideal control ability for the permanent magnet wind turbine, but when the wind changes suddenly, because this traditional control method needs to perform real-time switching of the stator AC a, b, c systems carry out cumbersom...

AI Technical Summary

Problems solved by technology

When the generator set is running in a steady state, the traditional vector control method has an ideal control ability for the permanent magnet wind turbine, but when the wind changes suddenly, because this traditional control method needs to perform real-time switching of the stator AC a, b, c systems carry out cumbersome coordinate system transformations to DC d, q systems that are relatively stationary with the rotor, and the control time is long, that is, when the wind turbine is in transient fluctuations, this traditional vector control method is slow in terms of time response speed Can not meet the control requirements of wind power generation system

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