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Studies of Transient Operational Performance of DFIG Wind Generation System under Grid Fault

Author: YeRenJie
Tutor: LiHui
School: Chongqing University
Course: Electrical Engineering
Keywords: Wind Power Doubly fed induction generator Grid failure Transient performance Transmission chain
CLC: TM315
Type: Master's thesis
Year: 2009
Downloads: 582
Quote: 4
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Abstract


With the planning and construction of large-scale wind farm, the gradual increase in the proportion of wind power in the power system, also will increase the access of the wind farm with the mutual influence of the power system. The research focus of the international wind power technology sector is small-capacity stand-alone wind power technology to the development of large-capacity system-level direction, the transition from the steady-state behavior of the study large-capacity wind farm to its access to the transmission grid, dynamic and transient behavior. Research focus of most attention is the interaction of large-capacity wind farms and power systems, one is the large-capacity wind farm incorporated into the transmission grid system stability, including the study of the dynamic and transient performance of the system, especially in the power grid the fault transient performance of the unit, such as grid the group transient modeling of wind turbines, the key parameters of the transient behavior and transient performance assessment, wind turbine low voltage ride through performance and ability. Thesis grid doubly fed induction wind turbine for the study, carried out in-depth research unit the transient operating performance of grid failure. Firstly, in the analysis of wind turbine power characteristics as well as the mathematical model based on the doubly fed induction generator, the grid voltage oriented vector control strategy simulation, to verify the effectiveness of control strategies doubly fed induction generator power power decoupling properties; Second, consider the flexible connection of the wind turbine drive chain electromechanical coupling effect, the establishment of a mathematical model of the transmission chain, the equivalent of two mass, a comparative analysis of different transmission chain equivalent model as well as different initial operating conditions of the unit transient performance electromechanical coupling unit transient run performance impact of the more obvious conclusion; departure from the principle of conservation of the stator and rotor flux crew electromagnetic transient mechanism derived machine-side short-circuit fault and different voltage drop degree of doubly-fed generator stator and rotor transient current parameter expression, and the simulation results verify the stator and rotor transient current estimated correctness; Finally, summarized world countries low voltage through (LVRT) requirements, and analysis different control methods based on, for example, a three-phase AC switch plus bypass resistors crowbar protection circuit crowbar protection circuit clearing time and different grid voltage drop analysis and the performance and capabilities of the unit the LVRT the run comparison. Obtained in this grid doubly fed induction wind turbine transient model, the impact of the electromechanical coupling, transient current assessment and the conclusion of the crew transient performance method for containing and network of large-capacity wind farm power system transient stability The analysis provides a theoretical foundation as well as decision support.

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