【摘要】 基于定子磁链定向的双馈电机控制理论,采用双PWM变换器结构,完成了兆瓦级变速恒频双馈风力发电机组的控制系统。其网侧变换器采用电压电流双闭环控制策略,转子侧变换器并网前采用转子电流开环控制策略,并网后采用有功、无功电流闭环解耦控制策略。该系统完成了亚同步、超同步运行时的系统满载实验以及模拟风速变化情况时系统有功、无功功率解耦控制的实验。实验结果验证了控制系统的可行性。更多还原

【Abstract】 Based on the stator flux linkage oriented control theory of doubly fed induction generator (DFIG), the control system of the megawatt level variable speed constant frequency (VSCF) wind turbine generator system, which adopts back-to-back PWM converters, is proposed. The grid converter adopts the voltage and current dual close-loop control strategy. The rotor converter adopts rotor current open-loop control before cutting-in, and the active and reactive current close-loop control after cutting-in. Under sub-synchronization and super- synchronization condition, the megawatt full-load experiment is conducted. The control system can also respectively regulate the active and reactive power output under variable wind speed condition. The experiment results validate the feasibility of the control system.更多还原