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Due to penetration of Double Fed Induction Generators in power systems and demand of the new grid code to remain connected during the fault, critical clearance time (CCT) and critical speed (CS) become very important. In this paper CCT and CS are obtained theoretically and compared with the simulation result.
In this paper, a new approach for modeling and control of reactive power in microgrid is presented. This structure utilizes wind turbine driven doubly fed induction generator (DFIG). Firstly, the dynamics of voltage and reactive power of DFIG and synchronous generator are represented via a model. After that, a control system is designed for the microgrid reactive power. This control strategy is used...
A deadbeat power control scheme for doubly-fed induction generator for variable speed wind power generation was proposed. The deadbeat power control uses the stator field oriented and the controller calculates the voltage vector to be supplied to the rotor in order to eliminate the active and reactive power errors in each period. Experimental results are presented for validation of the deadbeat controller...
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...
In case of three-phase short circuit fault occurring at the terminal of a doubly-fed induction generator (DFIG), the rotor current characters of DFIG are analyzed from the viewpoint of the flux linkage, and the expression of the rotor current is deduced together with the estimated expression of the maximum rotor current. Based on above analysis, the max rotor currents and their appearing times with...
This paper is interested in the study of a wind energy conversion system (WECS) based on a doubly fed induction generator (DFIG) connected to the electric power network. The aim of this work is to compare the energy production unit performances by the use of two types of controllers. Classical PI and polynomial RST controllers are applied for the WECS control in terms of instruction tracking and robustness...
With the development of modern wind energy generation, higher requirements to the grid in case of a failure were raised. In order to faciliate the recovery of power, while voltage dips in a certain range, protecting the rotor side converter and providing reactive power to the grid are both needed according to the requirements. This paper takes DFIG for example, in order to protect the rotor side converter,...
An approach employed for the evaluation of performance of self excited induction generator (SEIG) using fuzzy logic which needs a simple modelling is proposed in this paper. In general, the conventional techniques with analytical equations are used to analyse the performance of SEIG. Here a fully fuzzy based approach is tried to evaluate the performance. The results obtained from fuzzy logic approach...
According to the control principle of the vector analysis, this paper establishes Variable-Speed Constant-Frequency (VSCF) doubly fed induction generator's power-angle characteristic equation and static synchronizing torque's mathematical model firstly. The equation directly shows the relationships of DFIG's power-angle & static synchronizing torque and generator's parameters & rotor excitation...
Vector Control(VC) and Direct Power Control (DPC) of Doubly Fed Induction Generator(DFIG) is studied in this paper. Grid connection and steady state running for DFIG are discussed based on VC and DPC. Two kinds of control strategies of DFIG both have good performance during the cutting-in grid. This paper uses instantaneous reactive power theory of three-phase circuits to the DFIG control. DPC idle...
This paper explores methodologies to use a three-phase self excited induction generator (SEIG) for providing single phase power using appropriate renewable energy sources with suitable prime movers. It presents the general operating principle and steady-state analysis of a three-phase self excited induction generator (SEIG) having star/delta connected stator winding feeding three-phase balanced/unbalanced...
This paper presents the voltage build-up process and the terminal voltage control of a stand-alone self-excited induction generator (SEIG) using direct vector control (DVC) technique under variable speeds and different types of load. Here, the three-phase SEIG is excited by a pulse-width modulated voltage source inverter (PWM-VSI) connected to a single-capacitor on the DC side with a start-up battery...
The performance of three-phase Self-Excited Induction Generator (SEIG) with Static Synchronous Series Compensator (SSSC) is investigated to feed various static loads. The employed SSSC is a three-phase, Insulated Gate Bipolar Transistor (IGBT) based, PWM operated, Current-Control Voltage source converter (CC-VSC). The reference current to generate the gating signals is obtained by employing only one...
Steady state analysis of single-phase self excited induction generator is almost always carried out using the concepts of symmetrical components and the rotating field theories. The machine is modeled through its positive and negative sequence circuits with appropriate parameters pertaining to forward and backward fields. The final expression obtained through these analyses is a complex nonlinear...
A simple and intuitive Doubly Fed Induction Generator (DFIG) predictive rotor current control scheme is presented. Predictive control of an Indirect Matrix Converter (IMC) is combined with predictive rotor current control of a DFIG to achieve a very good dynamic response as the rotor currents smoothly follow the applied reference in a ±30% range of the generator nominal rpm. Simulation results are...
The no-load steady-state performance of a Y-connected three-phase induction generator under single-phase operation is studied, and the effects of combination between balance capacitors and excitation capacitors on the terminal voltage are analyzed. The loop impedance equation is obtained by employing the symmetrical component method. With both real and imaginary parts of the loop impedance equal to...
A real wind power generation system is given in this paper. SVM control strategy and vector control is applied for generator side converter and doubly fed induction generator respectively. First the mathematical models of the wind turbine rotor, drive train, generator side converter are described. Then the control strategy of generator side converter system is given in detail. Finally the simulation...
Power system with high penetration of wind power requires a developed control strategy to obtain optimal dynamic performance under load variations. An algorithm utilizing internal model control (IMC) design method for the control of doubly fed induction generator (DFIG) operating at variable speed constant frequency is proposed. The proposed structure is a stand-alone generating system and feeds a...
Due to the asynchronous generator has many negative factors such as large power fluctuation, poor transient performance, low energy efficiency, etc. The doubly fed induction generator(DFIG) is becoming a popular concept and thus the modeling of DFIG becomes an interesting research topic. This paper develops the DFIG model of power flow and third-order transient in which the power converter is simulated...
This paper presents the analyzed results of an integrated offshore wind farm (OWF) and seashore wave farm (WAF) connected to an onshore large power grid through a high-voltage direct current (HVDC) link to simultaneously achieve power-fluctuation mitigation and dynamic-stability enhancement. The performance of the studied OWF is simulated by an equivalent aggregated 80-MW doubly-fed induction generator...
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