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One of the major concerns for the stability of power systems including large amount of wind turbine generators is how to improve the Low-Voltage Ride-Through (LVRT) capability of wind turbine generators during voltage dip occurring in power networks. In order to achieve LVRT improvement, this paper proposes a new method of pitch angle control for induction-generator-type of wind turbine. If the turbine...
This paper presents generators models for rural electrification systems, fed from renewable energy. A brief introduction on wind energy and biomass system is shown, followed by dynamic modeling of three phase induction generator, single phase induction generators and Permanent Magnet generator. The aim of this research is to propose optimal electrification system design for rural areas, which are...
This article compares the behaviour of different order models, for large scale wind farms comprising doubly fed induction generators (DFIGs). While it is important to have a model which is detailed enough that all interesting phenomena can be examined, it is also important to have simple models, not only to reduce computation time, but also to simplify the design of controllers. This article compares...
In partial load torque control for variable speed wind turbine generators(VSWTG) rotational speed, which will be feedback signal, is very important parameter. The mathematical model of wind turbine and control regulation for maximizing energy conversion yield has been introduced in this paper. The control system stability and dynamic response are analyzed when using the wind turbine rotor side rotational...
In this paper, damping controller for dynamic and transient control of a variable speed wind turbine is presented. The phenomenon of drive train oscillations in wind turbines is discussed. It is illustrated how the damping controller is able to reduce the oscillations of the drive train significantly and mitigate fatigue damage due to drive train oscillations we studied the effect of damping controller...
A control strategy for the DFIG system during unbalanced voltage conditions is proposed in this paper. If the grid voltage is unbalanced due to grid fault or load unbalance, the voltage contains not only positive sequence voltage but also the negative sequence voltage. A negative sequence current control is implemented in synchronous reference frame to compensate the negative voltage at PCC (point...
Recent advancement in size and technology of wind energy conversion systems (WECSs) require sophisticated control systems to effectively optimize energy conversion and enhance grid integration. Doubly-fed induction generators (DFIG)-based WECS are the most promising and widely utilized technology. This study focuses on advanced controls development to identify and assess the critical loads and instabilities,...
To investigate the dynamic response of WECS to the events in power system, an accurate simulation model for DFIG (doubly-fed induction generator) system is developed using PSIM and a hardware-in-loop simulator is implemented using 3 kW M-G set. The model consists of wind model, rotor dynamics, wound rotor induction generator, power electronics converter and control strategies. Control strategies can...
This paper presents the results obtained from a PSCAD/EMTDC dynamic fault simulation of a grid connected Doubly-fed Induction Generator (DFIG). The transient stability performance of the DFIG is investigated; case studies which demonstrate the possibility of wind turbine generator torsional vibration, and the concept of Critical Clearing Time (CCT) for the DFIG are presented and the results are compared...
Doubly-Fed Induction Generators (DFIG) are commonly utilized in wind farms nowadays due to their advantages as compared with single-fed ones. Control complexities and their unique characteristics may, however, raise different problems during abnormal or faulty operating conditions. In this paper, an integrated simulation for DFIGs in wind farms is presented for protection application purposes in particular...
The study considers 10 MW, 600 poles, doubly fed induction generator, allowing direct-drive units with reduced size converter. The work relies on a lumped parameters design and on finite element verifications, and it compares some of its results to the findings of recent literature. The results of the paper evidenced a borderline feasibility of the considered generator.
In wind power systems, wind turbine is a core component. The usual mathematical model of wind turbines are put forward under the circumstance of constant wind speed, that is, to study the characteristics of the active power and the slip ratio at a fixed rotor speed, but these models cannot fully describe the operation status of the wind turbines under actual circumstances; therefore, this paper endeavors...
In this paper, a comprehensive time domain model for a wind park, suitable for stability analysis, is presented. The wind generator is modeled with a reduced order model for an asynchronous machine, whilst the wind turbine model takes into account the dimension of the turbine, the rotor blade and blade pitch angle. Each wind generator incorporates a STATCOM (static compensator) controller in order...
The dSPACE is the hardware plat for the real-time control system based on Matlab/Simulink, which has high reliability and rapid real-time. The decoupling real-time simulating method of discrete event excited converter system and continuous time dual stator-winding generator system based on dSPACE DS1104 is proposed. The real-time control modern of novel dual stator-winding generator based on DS1104...
A doubly-fed induction generator (DFIG) is a dasiaspecialpsila variable speed induction machine widely used in modern large wind turbines. Unlike a fixed-speed wind turbine, a DFIG wind turbine depends strongly on the controls of the system under variable wind conditions. This paper investigates statistical properties of energy capture, conversion, and control of a DFIG wind turbine under Weibull...
It is expected that increasing amounts of new generation technologies will be connected to electrical power systems in the near future. Most of these technologies are of considerably smaller scale than conventional synchronous generators and are therefore connected to distribution grids, as the DFIG-based wind farm. When connected in small amounts, the impact of wind farm on power system transient...
The doubly-fed induction generator (DFIG) now represents the dominant technology in wind turbine design. One consequence of this is limited damping and inertial response during transient grid disturbances. A dasiadecoupledpsila strategy is therefore proposed to operate the DFIG grid-side converter (GSC) as a static synchronous compensator (STATCOM) during a fault, supporting the local voltage, while...
Demand for wind power has increased considerably due to technological advances and favorable government policies. As a result, large wind farms with multi-megawatt capacity are connected to sub-transmission and transmission systems. With high penetrations of wind energy, performance of the overall system is affected by the technical impacts introduced by wind turbine generators (WTG). Fault current...
This paper focuses on the super/sub-synchronous operation of the doubly fed induction generator (DFIG) system. The impact of a damping controller on the different modes of operation for the DFIG based wind generation system is investigated. The co-ordinated tuning of the damping controller to enhance the damping of the oscillatory modes using bacteria foraging (BF) technique is presented. The results...
It is proposed in this article an optimal solution to improve the transient behavior of doubly-fed induction generators in wind parks connected to the electrical grid, when they are submitted to voltage sags due to the occurrence of faults in the electrical network. The recommended procedure in these cases is to maintaining the wind generator connected to the electrical network during and after the...
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