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The voltage impact of wind farms on weak grids is studied using a generic test system. The size of the wind farm is taken as 20% of the grid short circuit MVA to characterize weak grids. The voltage at the point of interconnection (POI) of the wind farm to the grid is analyzed for different values of grid X/R ratios. It is shown that reduction of real power injection at POI brings the voltage at POI...
Wind power, as an important and promising renewable resource, is widely studied. Recently, doubly fed induction generator (DFIG) becomes more popular in wind power due to its various advantages over other types of wind turbines, such as variable speed, lower power electronic cost and so on. However, the back-to-back converters require effective and accurate control to accommodate the complexity of...
This paper presents a new integrated model for the simulation of wind power generation systems. This model is not only more accurate but also computationally acceptable. It uses pulse width modulation by space vector modulation associated with sliding mode for controlling the converters. Power factor control at the output of the converters is considered in the model. We present a case study showing...
The vector control technique is applied in doubly fed induction generator (DFIG) according to the characteristic of AC-excited variable speed constant frequency (VSCF) wind power generation, a comprehensive control strategy is presented based on grid voltage orientation, which gets the same performances as stator flux orientation, but the stator flux observer can be omitted to simplify the control...
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...
The use of wind power has been increasing rapidly over last few decades and according to all predictions this trend is likely to continue. At the same time need for better cost effectiveness of wind power plants has stimulated growth in wind turbinespsila size and rated power. As wind turbines grow in size they are subject to extreme structural loads and fatigue. In order to reduce such loads advanced...
This paper investigates the modeling and control of doubly fed induction generator (DFIG) and fixed speed induction generator (FSIG) based wind farms under unbalanced conditions. A DFIG model suitable for analyzing unbalanced operation is developed, and used to assess the impact of an unbalanced supply on DFIG and FSIG operation are illustrated. Network voltage unbalance can cause unequal heating...
This paper presents design, modeling, and control of grid interconnection for a wind farm with round-rotor synchronous generators. The grid interconnection proposed in this paper supports the variable-speed wind turbine concept with the three-phase diode bridge as a front-end rectifier. The wind energy resources and the utility grid are isolated by intermediate fly-back converters. The grid interface...
In this paper, small signal stability analysis considering grid-connected wind farms of doubly-fed induction generator (DFIG) type is conducted. A simplified and practical DFIG model is presented firstly, and the stator flux-oriented vector control based method is employed to implement stator active and reactive powers control in modelling rotor-side converter. The power system small signal stability...
In recent years, there is a strong trend towards generation of wind power across the globe in geographically suitable areas with a more or less stable wind velocity. However, the erratic nature of wind velocity as a power source is leading to problems of voltage/frequency oscillations and stability in wind energy conversion systems (WECS). Therefore, extensive research is being carried out for efficient...
This paper presents a design procedure based on evolutionary computation, more specifically on genetic algorithm (GA) to obtain optimal PI controllers to the static converter connected to the rotor of doubly fed induction generators (DFIGpsilas), in variable speed wind generation systems connected to the electrical grid. The converter of the DFIG has a protection system that monitors continuously...
With increased structural flexibilities of modern wind energy conversion systems (WECSs), drive-train torsional oscillations due to high wind disturbances can be hazardous to power systems. It is particularly important to design control schemes that properly account for the flexible modes of the turbine, and maintain stable closed-loop behavior of the WECS. To capture the essential features of the...
Wind power generation system is typical multi-variable, non-linear and too complex to build precise mathematical model. In order to capture maximum energy at certain wind speed range and regulate active and reactive power independently, adaptive fuzzy control based on stator flux-oriented vector control was adopted. The simulation program was written in C compile language and Matlab. The results show...
Fault tolerance is gaining growing interest to increase reliability and availability of distributed energy systems where, a model based current and voltage sensor fault detection, isolation and reconfiguration is presented for a voltage oriented controlled double Fed induction generator, which is mainly used in wind turbines. A bank of observers is used to provide residuals for the fault detection...
Present energy problems involve issues of technology selection, placement, variation of energy services demand by location and time-of-use and new sourcing options especially renewable energy. Beside these issues, there are also, major challenges for current energy production where the cost and environmental impacts are some of the important aspects which determine the producers to consider alternative...
The wind energy conversion systempsilas (WECS) analysis requires the priory knowledgepsilas regarding the mathematical models for all component subsystems. The paper highlights some contributions to the preset values establishing strategies and models of certain components: rotation speed and voltage preset values establishing strategies, a simplified wind turbine model (fixed blade turbine), the...
Indirect and direct vector control strategies can be applied to a stand alone doubly fed induction generator (DFIG) for wind energy applications. The control algorithm allows generating constant frequency and voltage with variable mechanical speed. The maximum power tracking can only be realised by controlling the load power. In this study the load was modelled as a controlled rectifier supplying...
This paper presents a control technique to reduce the effect of unbalanced voltages on the line side converter of the wind energy conversion system with a doubly fed induction generator (DFIG). The unbalanced voltages produce oscillations of instantaneous active power and dc bus voltage. When the model of the unbalanced system is transformed onto the synchronously rotating reference frame, the d-q...
Traditional wind power generation is directly or step-down cut in, and the current impact is extremely high. In this paper, according to the characteristic of AC-excited variable speed constant frequency (VSCF) wind power generation, a vector control technique is applied in doubly fed induction generator (DFIG), and an idle load cutting-in control strategy is presented based on grid voltage orientation...
Using rotor d-q model as a start point, this paper analyses the mathematical model for BDFM based on synchronous reference frame. And, based on characteristics of BDFM, a new type of power control system is designed by using the gap flux oriented vector transformation control technology. In order to no existing of the big power storage capacitors, the matrix converter is used to control windings of...
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