Comprehensive method for vector and direct torque control of permanent-magnetic wind generator

Abstract

The invention relates to a comprehensive method for vector and direct torque control of a permanent-magnetic wind generator, and belongs to a comprehensive method which uses vector control when the permanent-magnetic wind generator is in a stable operation state and uses direct torque control when the permanent-magnetic wind generator is in a wind power generation transient state. The invention mainly aims to solve the technical problem existing in the prior wind generator control method that the transient swing is hard to control due to the sudden change of wind force. According to the technical scheme, the method comprises the following steps: a) establishing a vector control mathematical model of a permanent-magnetic wind generator in the stable operation state, and adjusting the gate of a corresponding insulated gate bipolar triode switch in a converter through control on component voltage and current of the d and q axes by pulse width modulation (PWM) so as to control the AC exciting current frequency of the permanent-magnetic wind generator and to further realize the control on the permanent-magnetic wind generator in a stable wind state; and b) controlling the permanent-magnetic wind generator by a wind generator direct torque control (WGDTC) method in the wind power generation transient state. The drawing shows the principle control diagram of the invention.

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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