Comprehensive method for vector and direct torque control on doubly-fed wind generator

Abstract

The invention relates to a comprehensive method for vector and direct torque control on a doubly-fed wind generator, and belongs to a comprehensive method which uses vector control when the doubly-fed wind generator is in a stable operation state and uses direct torque control when the doubly-fed 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 conventional vector control mathematical model of the doubly-fed 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 wind generator and to further realize super-synchronous and sub-synchronous variable-speed constant-frequency power generation of the wind generator; and b) controlling the doubly-fed wind generator by a wind generator direct torque control 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 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...

AI Technical Summary

Problems solved by technology

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 coordinate system transformation, the control time is long, that is, when the wind turbine is in transient fluctuations, this traditional vector control method cannot reach the time response speed Control requirements for wind power generation systems

Images