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Doubly-fed induction generator (DFIG) is widely applied in Variable Speed Constant Frequency (VSCF) wind power system. In recent years the proportion of wind power became more and more in the electricity supply. The failure of power grid will lead to voltage drop and will cause system transient instability and may lead to partial or full paralysis. So Low Voltage Ride Through (LVRT) requirements is...
The paper analyses the wind turbine characteristics and doubly-fed induction generator (DFIG) stator magnetic field orientation vector control principle, realizes DFIG active power and reactive power decoupling control. After the decoupling, the paper adopts sliding mode (SMC) control theory, proposes a control strategy to track the maximum wind energy. The method can increase the system robustness...
Power relations of doubly fed induction generator (DFIG) wind power generation system are analyzed. Based on this, a method is proposed to calculate the reactive power limit. Furthermore, the reactive power control of DFIG wind farm is studied and the control scheme is provided to exert the reactive power dealing capability of wind power system. A reactive power compensation strategy for the local...
In this paper, a wind turbine emulator (WTE) is designed and implemented considering different requirements from the development and test of control strategy in a doubly-fed wind power generating system. The WTE is based on a DSP system and a 4.2 kW separately-excited DC motor. The WTE can accurately reproduce the characteristics of real wind turbine. A PC interface is also developed using C language...
In order to compensate initial error of position encoder used for ac excited DFIG (doubly fed induction generator), a controller was proposed based on the steady state relationship between rotor currents and stator voltages with open stator windings, which is derived according to the mathematical model of DFIG in the synchronous frame. The compensation principle was analyzed. A stagewise control strategy...
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