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The electromechanical transients during a deloading of a DFIG turbine and the Fault Ride Through (FRT) capability of a DFIG wind farm connected through HVDC transmission lines are discussed. The electromechanical oscillations during a deloading operation of a DFIG wind turbine generator are simulated using BLADED software. Then power reduction control during a fault was achieved by reducing the power...
Wind power generation system is a complicated multivariable system with strong nonlinear, uncertainty and coupling. It's difficult to build precise mathematical model by using conventional method. In order to capture maximum energy, variable universe adaptive fuzzy PI control based on stator flux oriented vector control is proposed, which is used to control the generator stator active and reactive...
Wind energy conversion systems using the doubly-fed induction generator (DFIG) are the most commercialized topology worldwide, because this technology uses converters dimensioned for ±30% of the system rated power, thus reducing the equipment cost. The direct connection of the DFIG stator to the electrical system increases its sensitivity to grid disturbances. In this context, this paper analyzes...
In order to most effectively utilize the wind energy and improve the efficiency of wind generation system, an optimum control strategy of doublyfed induction generators (DFIG) was proposed, which made the system operation for both the maximum wind enemy captured below the rated wind speed. Based on the wind turbine characteristics and basic electromagnetic relationship of DFIG the mathematical models...
Modern wind turbines are capable to work in variable speed operations. These wind turbines are provided with adjustable speed generators, like the double feed induction generator. One of the main advantage of adjustable speed generators is that they improve the system efficiency compared to fixed speed generators because turbine speed is adjusted as a function of wind speed to maximize output power...
This paper analyzes the impact on transient and frequency stability for a power system at very high wind penetration (40% wind). Wind penetration is based on the doubly-fed induction generator (DFIG), and a systematic approach has been adopted for wind power integration. A sensitivity analysis has been carried out for each wind integration scenario and for different wind generator loading conditions...
A DFIG wind turbine is a variable-speed wind turbine widely used in modern wind power industry. The maximum power extraction of the turbine is affected by (1) electrical characteristics of the generator, (2) aerodynamic characteristics of the turbine blades, and (3) maximum power extraction control strategies. This paper presents a DFIG maximum power extraction study through integrated steady-state...
Variable-speed constant-frequent (VSCF) wind turbine with doubly-fed induction generator (DFIG) has super ability for wind energy tracking under rated wind velocity. Aimed at improving turbine dynamic control performance and power generation, a novel wind energy tracking control strategy is proposed, in which, wind velocity, rotating-speed and power signals are all adopted in fuzzy logical system...
A simple method involving only a quadratic equation has been developed for calculating the minimum and maximum values of excitation capacitance that will sustain self-excitation in an induction generator meant for isolated power supplies. This approach has also been further extended for the determination of maximum load of a given power factor that could be applied to the generator without losing...
This paper explores different strategies to set the reference current of a STATCOM under unbalanced grid voltage conditions. The aim of the proposed control strategies is to provide a set of reactive current references to be injected by the STATCOM under unbalanced grid faults. Their performance, as well as their grid support capability will be evaluated by means of simulations. Finally, the experimental...
This paper presents an analysis of a high-performance model reference adaptive system (MRAS) observer for the sensorless control of a induction generator (IG). The sensorless control is based on a model reference adaptive system observer for estimating the rotational speed. The proposed output maximization control is achieved without mechanical sensors such as wind speed or position sensor, and the...
This paper examines the impact of increased penetration of doubly fed induction generator (DFIG) based wind power generation on frequency control of an interconnected two-area hydrothermal power system. The power electronic control of DFIG effectively isolates the inertia from the grid which will impose the serious threat to frequency regulation capability of the system. To mitigate the frequency...
This paper addresses the fault detection and isolation issue of wind turbine systems. The underlying problem is very critical to enhance the reliability, the availability and reduce the cost of maintenance of wind turbines. In this work, we use a doubly fed induction generator and a nonlinear observer is utilized to generate the residual for fault detection purpose.
The use of dynamic reactive power compensation devices such as the STATCOM to improve power quality and Fault Ride-Through capabilities of FSIG wind farms is investigated. Also, the use of VSC-HVDC transmission to isolate the wind farm from impacts of potential faults in the grid side is investigated. Dynamic performance of the FSIG wind farm is explored under several operating conditions, such as...
This paper reports on experimental results for a grid-connected hybrid wind/micro-hydro power system associated with a supercapacitor energy storage device (SCESD). It comprises a doubly-fed induction generator linked mechanically and electrically (through back-to-back power electronic converters in the rotor circuit) to a permanent magnet synchronous machine, which may recover or supply the slip...
According to the mathematical model of the doubly-fed induction generator (DFIG) and the field-oriented vector-transformation control technique, the control strategy of the variable-speed constant-frequency wind power generator is analyzed which can realize the decoupling control of active power and reactive power of DFIG. On the experimental platform of the DFIG system which is based on TMS320LF2812,...
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...
Based on the transient model of double-fed induction generator (DFIG) under synchronous rotating reference frame, the electromagnetic transient simulation system of DFIG is implemented under PSCAD/ EMTDC. This paper deliberates the dynamic responses of stator and rotor voltage and current, active and reactive power, electromagnetic torque, rotor speed and DC link voltage both during the grid voltage...
To study the on grid wind turbine generator made in china, three types of horizontal axis three-blade wind turbine generator were researched. The design of wind turbine and the factors which influence the property of the wind wheel were studied. The mathematical model and operation principle of wind turbine with squirrel cage induction generator, doubly-fed induction generator and permanent magnet...
In order to study dynamic performances of wind turbine generator system (WTGS) in laboratory, a dynamic model of WTGS is necessary. Firstly, a dynamic wind turbine emulator (WTE) is designed, a novel dynamic torque compensation scheme is developed, which consider wind shear effect, tower shadow effect and big inertia of the actual wind turbine all together. Then, the mechanical transmission system...
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