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This work deals with the control of the wind energy conversion system (WECS) equipped with two doubly-fed induction generators (DFIG). The main generator is controlled in order to keep the voltage and the frequency in the rates values. The second generator is connected when the power demand increase. But, before the connection, with the first generator, synchronization is done. After that, the system...
This paper investigates a drive system control strategy for grid-connected wind energy conversion systems with doubly-fed induction generator and its behavior under grid fault operation. During grid faults there is a possibility for undefined load situations in the mechanical drive system. These loads are able to start oscillations in the drive system not only in the shaft but in the blades as well...
This paper investigates a drive system control strategy for grid-connected wind energy conversion systems with doubly-fed induction generator and its behavior under grid fault operation. During grid faults there is a possibility for undefined load situations in the mechanical drive system. These loads are able to start oscillations in the drive system not only in the shaft but in the blades as well...
This paper investigates a control strategy for grid-connected wind energy conversion systems with doubly-fed induction generators, that employs a novel d-q hysteresis current regulator in the inner control loops. Although the current control is implemented in a rotating reference frame synchronous to the positive sequence space vector of the grid voltage, it can be used to generate negative sequence...
Asymmetrical voltage conditions in the grid can have significant negative effects on the performance of wind energy conversion systems (WECS) equipped with doubly-fed induction generators (DFIG). Transient peaks as well as steady-state second-order and higher frequency harmonics are introduced in the active and reactive output powers, in the DC-link voltage and in the toque produced by the WECS. These...
Three equivalent drive train models of a wind turbine generator (WTG) are presented in this paper. The flexibility of the blades bending and the drive train are considered to analyze its transient stability under a three-phase fault. The simulations show that the fifth order lumped-mass model provides too optimistic estimation while the ninth order three-mass model can observe the motion of shaft...
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....
To improve wind energy utilization and power generation efficiency, the variable speed constant frequency (VSCF) wind generation system is an efficient way. Tracing the maximum wind power can be realized through the active and reactive power decoupled control. Based on the mathematical model of doubly-fed induction generator(DFIG), the strategy of using stator field oriented vector control technology...
Torque disturbances caused by the aerodynamic loads are the main influence factors on performance of the machine-side control in the wind energy conversion system (WECS). Based on port-controlled Hamiltonian (PCH) modeling theory, the machine-side subsystem of the WECS with the disturbances from the wind turbine was described by a novel PCH model with bounded unknown disturbances in this paper. Moreover,...
Wind energy is the fastest growing source of renewable energy in the power industry and it will continue to grow worldwide as many countries are developing plans for its future development. For power system operators, this increasing contribution of wind energy to the grid poses new challenges that need to be addressed in order to ensure the reliability and security of the electric power grid. One...
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...
Doubly-Fed Induction Generator (DFIG) has been widely used in Variable-Speed Constant-Frequency (VSCF) wind energy generation system. Vector control has already been applied to the DFIG control, which makes the DFIG gain good performance in the wind energy capturing operation. In recent years, many researches of vector control take the following manner to track the largest wind energy under the rated...
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