Abstract
In the wind energy generation system, the brushless doubly-fed induction machine (BDFIM) has shown significant application potential, since it eliminates the electric brush and slip ring. However, the complicated rotor structure increases the control difficulty, especially resulting in complicated coupled terms in the current sub-system, which deteriorates the dynamic performance and reduces the system robustness. In order to address the problems caused by complex coupled terms, an internal model current control strategy is presented for the BDFIM, and an active damping term is designed for suppressing the disturbance caused by the total resistance. The proposed method simplifies the controller parameters design, and it achieves the fast-dynamic response and the good tracking performance, as well as good robustness. On the other hand, the feedforward term composed by the grid voltage is added to the internal model controller in order to suppress the disturbance when the symmetrical grid voltage sag happens. Finally, the simulation and experimental results verify the feasibility and effectiveness of the proposed method.
Highlights
The Doubly Fed Induction Generator (DFIG) has been widely used in wind energy generation systems (WEGs), because the capability of its power converter is only about one third the wind turbine power rating [1], but the slip rings and electro-brushes of the DFIG lead to frequent maintenance and increases the system cost, especially for offshore wind farms [2]
PI resistance controllerand in [18], the inductance, controller parameters area related to the measured valueswith of thethe total the total while it takes lot of effort to adjust measured values of the total and the total inductance, it takes a lot of effort to adjust the controller parameters ofresistance the conventional methods by trialwhile and error methods; the proposed the controller parameters of the conventional by trial and methods; the proposed method eliminates the complex feedforward methods terms composed by error the motor parameters and method eliminates the complex feedforward terms composed by the motorthe parameters and variables, variables, which achieves fast-dynamic response and greatly reduces effects caused by the parametric errors
Paper, a state-space mathematical model of the theslow is established by selecting the flux, In thethis rotor flux and the control winding (CW) current as state variables, dynamic characteristics of the flux flux, the rotor flux and the CW current as state variables, the slow dynamic characteristics of the flux flux, the rotor flux and the current as state variables, the slow dynamic characteristics of sub-system is analyzed, and the current sub-system is independently designed
Summary
The Doubly Fed Induction Generator (DFIG) has been widely used in wind energy generation systems (WEGs), because the capability of its power converter is only about one third the wind turbine power rating [1], but the slip rings and electro-brushes of the DFIG lead to frequent maintenance and increases the system cost, especially for offshore wind farms [2]. Machine (BDFIM) has the outstanding features of no slip rings and electro-brushes, resulting in more robustness and durability than the DFIG [3,4,5]. In terms of the BDFIM control methods, the scalar control has no feedback link and it is difficult to obtain a fast dynamic response [10]. The direct power control [11] and the indirect control scheme [12]
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