Integrated method of vector and direct torque control for doubly-fed wind turbines

Abstract

The invention relates to a comprehensive method for vector or direct torque control of a doubly-fed wind generator and belongs to a comprehensive method which uses the vector control when the doubly-fed wind generator is in a stable operation state and uses the direct torque control when the doubly-fed wind generator is in a wind power generating transient state. The comprehensive method mainly solves the technical problems existing in the prior wind generator control 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 conventional vector control mathematical model of the doubly-fed 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 wind generator by a grid electrode of a bipolar triode switch of a corresponding isolated gate in an adjusting converter, and realizing the super-synchronous and sub-synchronous variable speed constant frequency power generation of the wind generator; and b) in the wind power generating transient process, using the doubly-fed wind generator controlled by the method of the direct torque control of the wind generator.

Description

technical field

[0001] The invention relates to a vector and direct torque control comprehensive method of a doubly-fed wind power generator, which belongs to a doubly-fed 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 double-fed wind turbines are regarded as a mainstream type of wind turbines at home and abroad. When the generator set is in steady state operation, the traditional vector control method has an ideal control ability for the doubly-fed wind turbine, but when the wind changes suddenly, because this traditional control method needs to perform real-time control of AC a, b , c system to the relatively static DC d, q system for cumbersome c...

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