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This paper proposes a new control strategy to capture optimum power from the wind through closed loop current control and rotor speed regulation of DFIG. Firstly wind turbine characteristics and optimum power curve is introduced. Active and reactive power decoupling control is adopted from the principle of stator oriented field control. Mathematical model of DFIG with current control loop using PI...
To accurately simulate the operating charcteristics of turbine generator running after loss of excitation, this paper established a field-circuit-motion direct coupled FEA model, obtained stator terminal voltage, stator current, speed and other variables waveforms after loss of excitation, as well as the distribution of rotor eddy current; through indirect magnetic-thermal coupling model to achieve...
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...
Through the finite element method, nonlinear load characteristics for a certain 1000 MW hydro generator within considering saturation are studied based on theoretical analysis. The characteristic curves are relationship between resultant current and air electromotive force. To obtain a series of saturated nonlinear load characteristic curves under varied conditions, the different operation conditions,...
This paper presents analytical study and simulation results of a grid-connected doubly fed induction machine for wind applications. The modelling of the system considers machine side converter and its control strategy. In order to decouple the active and reactive powers generated, stator-flux-oriented vector control method is applied. Subsynchronous and supersynchronous operating conditions were simulated...
In this paper, direct torque control (DTC) technology of doubly-fed induction generator (DFIG) is analyzed in detail and applied to variable speed constant frequency wind power generation system. A rotor power factor adjustable DTC with maximum wind power tracking is discussed and rotor voltage vectors are obtained based on the look-up table. Based on the stochastic wind which is generated by the...
Powerformer is a kind of new high-voltage generator. The simulation method of dynamic simulation analysis of Powerformer under loss of excitation base on MATLAB/simulink is proposed. Simulation model of exciting windings open circuit based on simulink is built, and simulation result is analyzed. The changing regular pattern of exciting electric current, stator current, stator terminal voltage, active...
This paper first introduces the double-fed wind power generation systempsilas basic theory, and builds the mathematical model of the double-fed generator in the rotary coordinate system. In order to deal with the strong coupling problems in motor control field, the motor vector control technology is researched and the idea of dual-fed generator stator-flux-oriented vector control strategy is presented...
In this paper, the capacity calculation of control winding of new style dual stator-winding induction generator by analytic method under resistive load is analyzed. A general calculation equation is deduced. And the capacity of system under variable rotor speed and variable load conditions is calculated respectively. The change laws of reactive power caused by the varying of generator parameters,...
This paper presents a novel strategy to calculate the eddy current, loss and temperature fields of the end region of a 1000 MW turbine-generator. Discretization is needed only in the radial/axial plane. The magnetic-thermal coupled field under different operating modes is calculated by an integrated computing system, which is developed by using commercial software ANSYS being nested in Visual-Fortran...
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