Double feeding induction generator dual channel excitation control method based on dynamic synchronizing shaft system

Abstract

The invention discloses a dual-passage exciting control method of a doubly fed induction generator, which is based on a dynamical synchronous reference frame. The control method is characterized in that active power is only relevant to the component Urd on the d shaft of the dynamical synchronous reference frame under the dynamical synchronous reference frame when the doubly fed induction generator stably runs, reactive power is only relevant to the component Urq on the q shaft of the dynamical synchronous reference frame, and the independent control to the active power and the reactive power of the doubly fed induction generator is realized through controlling the projections of a rotor exciting voltage phasor Ur on the d shaft and the q shaft . The control method has good dynamic tracking ability, and improves the robustness of an exciting control system, each control coefficient respectively influences the dynamic response during the process of adjusting the active power, the reactive power and the rotating speed, the design of the exciting control system is facilitated, the independent adjustment to the active power, the reactive power and the rotating speed of the doubly fed induction generator is realized, and the doubly fed induction generator is enabled to have good dynamic and transient stability. The invention enables the doubly fed induction generator to be applied to water power generation, wind power generation, and the like, and has obvious advantages of good stability, wide operating range, high energy utilization rate, and the like.

Description

technical field [0001] The invention relates to an excitation control method of a doubly-fed induction generator, in particular to a dual-channel excitation control method of a doubly-fed induction generator based on a dynamic synchronous shaft system. Background technique [0002] The active power and reactive power of the stator of the doubly-fed induction generator are only related to the d and q-axis components of the rotor excitation current in the synchronous coordinate axis system. According to this basic principle, in order to realize the decoupling control of active power and reactive power of the doubly-fed induction generator , the existing doubly-fed induction generator excitation control method can be roughly divided into three categories, one is based on the synchronous coordinate axis dual-channel multi-variable feedback excitation control method; the second is based on synchronous motor frequency conversion speed regulation vector control The proposed vector ...

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Problems solved by technology

However, these control methods have some unavoidable defects, which are usually manifested in the following aspects: a) In the dual-channel multivariable feedback excitation control method based on the synchronous coordinate axis system, when the slip rate is not zero, the rotor excitation voltage and current Cross-coupling occurs, which must be compensated by rigid negative feedback composed of stator and rotor currents, which makes the excitation control system relatively complex and the dynamic control effect is affected; b) The vector excitation control method will inevitably lead to the complexity of the control system in order to achieve the orientation of the stator magnetic field. Moreover, a lot of simplifications have been made in the theoretical derivation of its control method, resulting in a decrease in the accuracy of the control model; c) the control system of the multi-scalar excitation control method is relatively simple, but due to the inaccuracy of its mathematical model, it will lead to double-fed induction generation. The response of the machine in the dynamic process becomes poor, and the transient stability is not good

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