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This paper explains a method to calculate the capacitance value of a 3-Ø cage induction motor working as a generator in the self-excited mode of operation. The synchronous impedance test method has been reviewed. The capacitance value is determined from the manufacturer data. The effect of voltage variation with different capacitances has been evaluated at constant speed. Performance of self-excited...
Wind power, as an important and promising renewable resource, is widely studied. Because the wind is highly variable, it is very desirable to operate a wind turbine at variable speeds. In this respect, doubly fed induction generator (DFIG) has become popular in wind power generation system. The steady state simulation analysis of a DFIG is essential to understand the behavior of DFIG such that it...
With increasing wind power in power systems, impact of wind generators on subsynchronous resonance (SSR) is of interest. Previous research has shown the impact of wind generation on SSR. In this paper, a control strategy is developed utilizing the power converters' control capability in a doubly fed induction generator (DFIG)-based wind turbine system. The control is realized through modulating the...
A detailed computer simulation for interconnecting wind energy system to an electric utility is presented. The proposed system consists of four high rating wind turbines each one uses double fed induction generator (DFIG). Two back to back bidirectional PWM inverters are used in the rotor circuit of each DFIG to be interfaced with the electrical utility. The simulation incorporates a flexible independent...
This paper addresses the representation of a wind power plant, based on wound rotor asynchronous generators, with a centralized voltage controller, by an equivalent transfer function, valid for small signal voltage control studies. This representation allows to investigate the influence of the centralized plant control gain and short circuit ratio on the system stability, for instance, by analyzing...
This paper presents control of doubly fed induction generator for variable speed wind power generation. The control scheme uses stator flux-oriented control for the rotor side converter and grid voltage vector control for the grid side converter. A complete simulation model is developed for the control of the active and reactive powers of the doubly fed generator under variable speed operation. Several...
The synthesis of the mathematics model is done using three S-functions based on state equation, thus simplifying and accelerating the implementation of DFIG. The VSCF DFIG wind power generation is transient response proceeding, which is influenced by operation characteristics of generator before and after grid connection. A complete simulation model of VSCF DFIG wind power generation based on Matlab...
This paper first introduces the basic theory of double-fed wind power generation system, and builds the mathematical model in two-phase rotary coordinate system. In order to deal with the strong coupling problems, the vector control technology is introduced, and the idea of dual-fed generator stator-flux-oriented vector control strategy is presented. Based on the two-phase simplify mathematical model...
Double-fed induction generator (DFIG) is took as a research object in this paper, a relatively complete mathematical model of DFIG control system including wind turbines, driving system and generator has been established. Besides, a variable-speed variable-pitch control strategy is put forward and some simulation models of DFIG based on MATLAB / SIMULINK are built and realized. Then, take step change...
This work considers the seldomly treated case of rotor turn-to-turn fault of a doubly-fed induction generator. This fault can take place where the doubly-fed induction generator is a standard solution in wind power stations. For investigations an error-adoptable three phase machine model is derived and simulated. Furthermore the model is integrated in a wind energy plant model and simulated for a...
Different aspects of reactive power regulation problem in wind farms are presented in this paper. In the first part some background of the reactive power control in wind parks is presented, including motivations for its use and methods that can be used. In general, there are active (wind generator, compensator) and passive methods (L,C) of reactive power compensation. A simulation model of the wind...
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