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首页> 外文期刊>Electric Power Components and Systems >A Damping Method for Torsional Vibrations in a DFIG Wind Turbine System Based on Small-Signal Analysis
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A Damping Method for Torsional Vibrations in a DFIG Wind Turbine System Based on Small-Signal Analysis

机译：基于小信号分析的双馈双馈风力发电机组扭振阻尼方法

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摘要

Torsional vibrations present in the drivetrain excited by turbulent winds or grid disturbances (often manifesting as voltage sags) can produce severe stresses on the components of wind turbines. This study presents a damping method for the rotor side converter of a doubly fed induction generator (DFIG)-based wind turbine to improve system damping during small grid disturbances. Within the damping strategy, torsional damper is included into the power loop of the rotor side converter to provide damping for the system. During vibrations, a well-designed low-pass filter (LPF) is employed by the torsional damper to extract the dynamics of the generator speed and to generate a damping signal. To demonstrate the proposed damping approach, the small-signal stability model of a wind turbine connected to an infinite bus system is presented, and the eigenvalue analysis is conducted to verify the damping effect introduced by the torsional damper. In the case study, grid voltage sag at the point of common coupling (PCC) is applied to excite the torsional vibration of the wind turbine shaft. The validity and effectiveness of the proposed damping approach are testified by using the simulation results against theory analysis.
机译：湍流或电网干扰（通常表现为电压骤降）引起的动力传动系统中出现的扭转振动会在风力涡轮机的组件上产生严重的应力。这项研究提出了一种阻尼方法，用于基于双馈感应发电机（DFIG）的风力涡轮机的转子侧变流器，以改善小电网扰动期间的系统阻尼。在阻尼策略中，扭力阻尼器包含在转子侧变频器的功率回路中，为系统提供阻尼。在振动期间，扭力阻尼器采用了设计良好的低通滤波器（LPF），以提取发电机转速的动态变化并生成阻尼信号。为了证明所提出的阻尼方法，提出了连接到无限总线系统的风力涡轮机的小信号稳定性模型，并进行了特征值分析以验证扭振阻尼器引入的阻尼效果。在案例研究中，采用公共耦合点（PCC）处的电网电压骤降来激发风力发电机轴的扭转振动。通过对理论分析的仿真结果验证了所提出的阻尼方法的有效性和有效性。

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