Abstract
The transient of the DFIG engages a lot of non-smooth elements such as switches of controllers and saturation of limiters, thus, the simplified non-smooth model of DFIG for electromechanical transient analysis is needed. This paper proposes a non-smooth simplified model of DFIG for electromechanical transient analysis, with the viewpoint of the transient response and energy accumulation. First, the general non-smooth dynamic behavior of DFIG during fault-on and post-fault periods are presented and the model is divided into four smooth stages. Then, the detailed model for the transient stage, according to without/with the trigger of the crowbar is presented. Furthermore, the simplified model of DFIG in the steady state is introduced according to without/with the trigger of the crowbar and saturation of limiters, determined by the stator voltage. Moreover, the transient model with/without the crowbar protection are simplified according to the principle of constant energy accumulation. Thus, the overall non-smooth simplified models of DFIG is obtained. Finally, the effectiveness of the proposed non-smooth simplified model is verified with the simulations.
Highlights
In recent years, WTG represented by DFIG has been connected to the power grid with a large scale [1]
The one is the transient stability of WTG itself [3], the other is the transient stability of power system due to the interconnection of WTG [4]–[13]
In recognized the above problems, this paper proposed a non-smooth simplified model of DFIG for electromechanical transient analysis, with the viewpoint of the transient response and energy accumulation
Summary
WTG (wind power generator) represented by DFIG (doubly fed induction generator) has been connected to the power grid with a large scale [1]. In recognized the above problems, this paper proposed a non-smooth simplified model of DFIG for electromechanical transient analysis, with the viewpoint of the transient response and energy accumulation. (1) the transient stage in fault-on period (2) the steady-state stage in fault-on period (3) the transient stage in post-fault period (4) the steady-state stage in post-fault period For each stage, the DFIG is equivalent to different models according to whether the crowbar is triggered or not DETAILED NON-SMOOTH MODEL OF DFIG AT TRANSIENT STAGE This section presents the detail model of DFIG with/without the trigger of the crowbar.
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