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Accurate representation of wind power plants (WPP) in both offline and online power system stability studies has gained importance because of the rapid increase in installation of wind generation around the world. However, because increases in accuracy reduce computational efficiency, reduced WPP representation is preferred. To improve accuracy of the reduced WPP model, other authors have proposed...
As a renewable, clean energy, wind energy has attract more and more attention. It has become a common understanding of the world to vigorously develop wind energy. In order to guarantee the safety and reliability for wind power integration operation, it is of great significance to establish an appropriate wind power generator system model and analyze its electromagnetic transient characteristics....
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...
The 1.5MW half-direct permanent magnet synchronous wind generator with 252 slots, 32 poles is investigated in this paper, and two kinds of generator designs according to permanent magnet embedded in different rotor positions are presented. Based on the fluid mechanics theory, the mathematical models of 3D fluid field that fluid flowing through the outer-surfaces of generators are established, and...
The 1.5MW half-direct permanent magnet synchronous wind generator with 252 slots, 32 poles is investigated in this paper, and two kinds of generator designs according to permanent magnet embedded in different rotor positions are presented. Based on the fluid mechanics theory, the mathematical models of 3D fluid field that fluid flowing through the outer-surfaces of generators are established, and...
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...
Wind farms begin to influence the power systems with the increasing amount of wind power penetration. The study of such influence justifies the need of a dynamic wind farm model comprising of a large number of generators, but detail models require high simulation computation time. An aggregation technique is required to reduce the model order while maintaining its accuracy. In this paper, a complete...
A wind farm usually consists of a large number of wind turbine generators (WTGs) connected through an internal electrical network and operating simultaneously. In order to study the impact of a wind farm on the dynamics of the power system, a major issue is to develop adequate equivalent models that allow characterizing the dynamics of all individual WTGs. In this sense, with the advance of power...
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...
The aim of this paper is to minimize the structural mass of large direct-drive wind generators using a ring-shaped buoyant rotor structure. A surface mounted permanent-magnet machine configuration is chosen for the proposed generator. The active mass of the generator is estimated by an electromagnetic design. Structural deformation equations for the proposed generator are derived, and the structural...
This paper presents an RST controller design applied to a horizontal wind turbine, functioning in the above rated wind speeds area. The controller presented here, is a robust digital controller which aims to regulate the wind turbine rotor speed through collective blade pitch control. The paper starts with a state of the art of wind turbines and their problematic and continues with the design of the...
This paper focus on the fast transient stability simulations of Wind Turbine Generator (WTG). In the simulations, network was presented as algebraic network model with only the fundamental frequency component of voltages and currents being considered in order to reduce the computation time. The simulation approach is mainly used for voltage and angular stability investigations. Models of wind turbine...
A new constant-frequency double-rotor (CFDR) generator for the wind power generation is proposed in this paper. The CFDR generator needs only part-size power converter which is the same as that of the doubly-fed induction generator. As permanent magnets are mounted on the outer rotor of the CFDR generator, high performances may be achieved. In this paper, the structure of the double-rotor generator...
It is the main objective for conventional variable-speed constant frequency wind energy conversion system (WECS) below the rated power to realize maximum power point tracking (MPPT). This paper presents a double objectives control scheme for WECS. Based on the frequency separation principle, the wind speed is divided into two components, a slowly varying component, named seasonal, and a rapidly varying...
This paper presents the principle for variable speed constant frequency AC exited wind power system. In the coordinate commutation technology, the AC excited generator's mathematical mode has established under three-phase static coordinate system, thus was carried on the analysis to it that in the independent movement's time situation, built system's simulation module in MATLAB simulation software,...
This paper focuses on normal operation control of permanent magnet synchronous wind power generator system. It presents the system model theory and the operation control strategy under all the detailed information, such as reference direction of variables. Then a simulation for the normal operation of PMSG system is carried out in PSCAD with the desired results obtained.
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...
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...
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...
A detailed dynamic model of wind driven doubly fed induction generator system has been developed. The various converter controls have been identified and their order in enhancing the dynamic performance has been established through Hankel singularity value indices and also residue evaluations. Damping controller structure and most effective input to the controller have been determined using the controllability...
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