风电并网系统低频振荡抑制策略研究

Research on Low Frequency Oscillation Suppression Strategy for Wind Power Grid Connected Systems

随着日渐提高的风电渗透率,电力系统中低频振荡问题日益严重。为此,基于模糊逻辑设计了一种应用于双馈风机有功控制环节的阻尼控制器。首先,建立双馈风力发电机的转子侧换流器数学模型;其次,定性分析双馈风电机组输出有功对系统阻尼特性的影响;最后,基于模糊逻辑设计了一种应用于转子侧换流器的附加控制环节的阻尼控制器,并采用时域仿真法对其控制效果进行了仿真验证。结果表明,所设计的控制器有效地抑制了系统的低频振荡。

With the increasing penetration rate of wind power,the problem of low-frequency oscillation in the power system is becoming increasingly serious.To this end,a damping controller was designed based on fuzzy logic for the active power control of double-fed wind turbines.Firstly,a mathematical model was established for the rotor side converter of a doubly-fed wind turbine;secondly,the impact of output active power of double-fed wind turbines on the damping characteristics of the system was qualitatively analyzed;finally,a damping controller with additional control loop applied to the rotor side converter was designed based on fuzzy logic and its control effect was verified through time-domain simulation.The results show that the designed controller effectively suppresses the lowfrequencyoscillation in the system.