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The Sensorless Control Technique of Direct-drive Wind Generators

Author: LuJianLiang
Tutor: JinXinMin
School: Beijing Jiaotong University
Course: Electrical Engineering
Keywords: Permanent magnet synchronous generator Speed ??sensor technology Vector control Zero the d-axis current control Stator Flux Observer
CLC: TM315
Type: Master's thesis
Year: 2011
Downloads: 104
Quote: 1
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Abstract


Direct drive wind turbine because of its high energy conversion efficiency, high reliability, and network power control flexibility advantages, has become an important research direction after following double-fed wind turbine wind power technology. Speed ??sensor position sensor installed to increase the cost of the system, reduce the reliability of the system, but also vulnerable to the impact of factors such as temperature, humidity, and vibration control technology has become the research focus direct-drive permanent magnet wind power. Therefore, the paper focuses on the direct drive the PMSG no speed sensor control technology to expand the theoretical research and analyze the stator flux observer design method and control strategy of PMSG, and through the simulation and experimental verification of the correctness of the theoretical research. First, the status quo and development trend of wind power on a constant speed constant frequency and VSCF wind power control mode, the comparison on the basis of active rectification and passive rectifier. Research speed sensorless control of permanent magnet synchronous motor technology. Second, the study of the mathematical model of a direct-drive permanent magnet synchronous generator and its control strategy. Derived a mathematical model of the coordinate transformation matrix and coordinate system PMSG;-depth study and compare the vector control of PMSG, been based on the realization of the control block diagram of ZDAC; and SVPWM method to do the analysis. Third, the speed sensorless control of permanent magnet synchronous generator technology. Performance through simulation comparison of several methods of observation-based UI model stator flux selected based on coordinate transformation saturated feedback integrator for position estimation, and to explore the principles of the method parameter selection and the rotor position angle compensation method. Fourth, as the simulation verify the theoretical analysis results, set up a direct-drive PMSG speed sensorless vector control system simulation model, the estimation accuracy of the rotor position angle, ZDAC control the precision of the rotor position angle relative to the current phase relationship are is analyzed. Finally, as the experimental verification of the theoretical analysis, to build a state of permanent magnet synchronous motor running on the dragged experimental platform to simulate wind power. DSP-based hardware and software design of the system. This small power generation experiments based on speed sensorless flux observer and vector control strategy was validated.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Wind turbines
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