双馈风力发电机的空载并网控制研究

Study on Cutting-in Control of the Variable-speed Constant-frequency Wind-power Generator

通过分析交流励磁变速恒频风力发电机组运行特点,将矢量变换技术应用到发电机并网控制上,应用了一种基于定子磁场定向转子电流开环控制策略,分析了定子电压、频率、幅值及相位的控制规律,建立发电机空载并网仿真模型,对并网前的空载运行、并网的过渡过程进行系统仿真。仿真结果表明,该控制策略有效地控制了发电机的定子电压与电网电压在幅值、相位、频率上的一致,是一种较理想的并网方式。

By analyzing the operation behavior of an A. C. excited variable-speed constant-frequency （VSCF） wind-power generator, the field-oriented vector control scheme was transplanted into the cutting-in control of the generator,a realized scheme of the control strategy was designed by analyzing the control regulation of the stator voltage,frequency,magnitude and phase. A no-load cutting-in simulation model was established and employed to make a comprehensive system simulation on the no-load operation before the cutting-in, the transient process at the cutting-in monment. The results of the simulation show that the control strategy can effectively control the stator voltage frequency, magnitude and phase as the same as the electrical network and that the proposed no-load cutting-in scheme is an relatively ideal cutting-in approach for the VSCF windpower generation.