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Under voltage dip conditions, the induced rotor over-currents of the doubly fed induction generators (DFIG) may greatly destroy the converter switches. In this paper, a nonlinear control based on integral backstepping control (IBC) strategy is presented to enhance the Low voltage ride-through (LVRT) of DFIG. The goal of the proposed control strategy applied to rotor side converter (RSC) and grid side...
This paper studies transient voltage stability in a 9-MW doubly-fed-induction-generator-based wind farm integrated with one superconducting fault current limiter (SFCL)-based passive voltage compensator and one transient voltage control (TVC)-based active voltage compensator. To achieve effective control manner, basic cooperative operation and modeling of the two voltage compensators are described...
Doubly fed induction generator (DFIG) represents one of the more used generators for the conversion of wind energy, whose operation is based on the capacity to adapt their excitation to obtain grid-frequency voltage. An experimental study of a 4 kW DFIG is presented, together with the corresponding behavior modeling when interconnected to a grid of infinite power, under steady-state and transient...
Self-excited induction generator (SEIG) is preferred in isolated and remote power generating systems. But the major problem associated with SEIG is change in voltage and frequency during loading condition. For the development of simple voltage and frequency controller it is essential to detect the load transient in less time using less hardware. In this paper Second Generation Wavelet Transform (SGWT)...
This paper presents an improved coordinated fault ride-through (FRT) control strategy for a doubly fed induction generator (DFIG) based wind turbine, (WT), in a weak grid. A technique for grid synchronization against voltage excursions, i.e., a Dual Second Order Generalized Integrator — Frequency Locked Loop (DSOGI-FLL) is utilized to extract a robust grid voltage synchronization signal irrespective...
The crowbar circuit installed in the rotor side is frequently adopted by doubly-fed induction generator (DFIG) to implement low voltage ride through (LVRT) ability. Based on DFIG transient characteristic, this paper discusses the principle of choosing crowbar resistance and input lasting time from the view point of converter security, wind turbine security and wind power generation system restoring...
Renewable energy resources like hydro power plants play a more important role in the upcoming future of power grids. Thereby, a full flexibility of utilizing the grid capabilities in terms of active and reactive power production in generating mode as well as power consumption in pumping mode in conjunction with the best available efficiency of both electric and hydraulic devices gains in significance...
In this paper, the fault ride through (FRT) of the doubly fed induction generator (DFIG) wind turbine is studied. The study is done by using a simulation environment in which the network is simulated using Real-Time Digital Simulator (RTDS) and the wind turbine is simulated using dSPACE in real time. The effect of transient flux on the operation of the wind turbine during a network voltage dip is...
In this paper a soft-starter model and its control strategy for connecting solutions to the grid of different operation modes for a wind turbine generator of 2/0.5 MW are evaluated. The thyristors switching for different functions of the firing angle are discussed. A complete simulation model of a constant speed wind turbine with cage rotor and double stator windings induction generator is also presented...
Due to the double fed induction generatorpsilas (DFIG) advantage of controlling active and reactive power independently and partial power converter, DFIG is becoming a popular type of wind power generation system. Nowadays, the grid code demands that the wind power generator possesses the ability of riding through the grid voltage sags, only when the grid voltage drops below the specific curve, the...
This paper proposes the investigation on the performance between standard and high efficiency induction machines operating as grid connected induction generators having same rating of three phase, 2.2kW, 220/380V, 4-poles for supplying electric power to utility grid. Analysis and comparative study on operating of induction generators under transient and steady state conditions at no-load and full-load...
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