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The increasing wind power penetration brings new challenge for wind turbine to provide Low Voltage Ride-Through (LVRT) capability. Doubly Fed Induction Generator (DFIG) has been widely used in wind turbines; due to its cost-effective partially power rated of the converter and Variable-Speed Constant-Frequency (VSCF) operation. However, the DFIG system has two poorly damped poles and is sensitive to...
The dynamic performance of Doubly-Fed Induction Generator (DFIG) before and after connection is analyzed based on corresponding mathematical models and transfer functions in decoupled vector control. The parameter tuning methods of rotor current regulator before and after connection are given. To reach same dynamic performance the parameters should take different values and be switched before and...
The increasing wind power penetration brings big challenge for wind turbine to provide Low Voltage Ride-Through (LVRT) capability. Current grid codes require that wind turbine should support the grid voltage by the reactive power control. Doubly Fed Induction Generation (DFIG) system commonly uses rotor crowbar to protect the vulnerable power converter during grid voltage dips. Its unavoidable drawback...
Given the characteristics of MW-level direct-drive permanent magnet synchronous generator (PMSG), a simple sensorless low-pass-filter-compensation-integrator (LPFCI)-based rotor flux position estimation control method is proposed. Its implementation principle is introduced in detail. Furthermore, saturation feedback double integrator based on coordinate transform (SFDICT) and LPFCI are discussed in...
The fast development of wind power generation brings new necessary requirement for wind turbine to provide Low Voltage Ride-Through (LVRT) capability. The paper introduces the models of Doubly Fed Induction Generator (DFIG), converter and rotor active crowbar, and analyses characteristics of DFIG system with rotor active crowbar during grid voltage dip. A novel turn-on and turn-off control method...
This paper presents a detail analysis of flux control for high performance and high speed operation of an interior permanent magnet synchronous generator (IPMSG) used in the power generation. In this work, an algorithm for flux control is proposed to achieve optimum efficiency over the IPMSG. When the IPMSM worked as a generator, is almost in the constant power region meanwhile the flux control for...
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