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Simulation Research of Converter Control Strategy for Doubly-fed Wind Power Generation System

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Tutor: ChangLi
School: Huazhong University of Science and Technology
Course: Water Resources and Hydropower Engineering
Keywords: modeling and simulation,converter control,PI parameters design,VSCF
Type: Master's thesis
Year:  2013
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Due to the relatively high power capacity of single turbine, wind power generationhas attracted more attention these years. However, even if the installed capacity of windturbine has maintained a sustained and rapid growth these years, only a small percentageof electricity comes from wind power in China. A lot of work is needed to improve theefficiency and stability of wind power generation, thus to meet the requirement of thepower system and intensify the competitiveness of wind power.In this thesis, a basic simulation platform has been developed in MATLAB/Simulinkfor a typical1.5MW variable-speed constant-frequency (VSCF) wind power conversionsystem based on doubly-fed induction generator (DFIG), in order to provide a convenientexperiment environment for MW level wind turbines¡¯ research and development. Themain work includes:(1) Based on the mathematical model of the wind turbine, driven train, DFIG andback-to-back converter, simulation models have been built for them in per-unit system;(2) Vector control strategy has been studied for both grid-side converter (GSC) androtor-side converter (RSC);(3) Design and optimize the control parameters of the converter controllers and thenvalidated the control performance through simulation experiments.Simulation results show that when connected with ideal power grid, through gridvoltage oriented vector control, GSC controller can set the unit power factor in AC sideand maintain the DC-link voltage to support the normal operation of DFIG converter; theRSC controller can realize the maximum power point tracking (MPPT) and reactive powercontrol of DFIG under rated wind speed with the implement of stator flux oriented vectorcontrol. However, the current control through space vector pulse width modulation(SVPWM) can reach the steady-state within0.1seconds while the active power controlneed tens of seconds because of the long inertia time constant of wind turbine and DFIGrotor.
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