中文摘要：

传感器故障下,为实现海上双馈风电系统的重构控制和不间断运行,需要精确的转子电流观测信号,研究参数鲁棒性好、动态响应速度快的转子电流状态观测策略。在分析同步坐标系下双馈风力发电机数学模型基础上变换电机模型,选取定子电流为状态向量;通过控制定子电流估计值的偏差,设计滑模控制器,跟踪定子电流;系统进入滑动模态后,通过低通滤波器滤波,去除控制器输出信号中的高频失真信号,获得转子电流观测值。基于PSCAD/EMTDC仿真平台,搭建双馈电机滑模观测器矢量控制系统模型。仿真结果表明,该观测器估算方法能够快速跟踪电机转子电流变化,并可在一定程度上抑制参数误差对电流观测精度的影响,算法简单、易实现。

英文摘要：

To realize reconfiguration control and continuous operation of the offshore doubly- fed wind generator systems,the accurate observation of rotor current signals must be provided under sensor fault. The observation strategy of rotor current status was studied with strong robustness of parameters and fast dynamic response. The mathematical model of DFIG was transformed to select the stator currents as state vectors by analyzing the machine model in synchronous coordinate. The sliding controller was designed to track stator current though regulating the bias of the estimated value of the stator current.The high frequency distortion section of the controller＇s output signal was removed through a low pass filter to obtain rotor current observation value as the system entered the sliding mode. The simulation model of DFIG vector control system with a sliding mode observer was built in PSCAD/EMTDC simulation environment. The results of simulation show that the changes in the rotor current of DFIG can be quickly tracked in this observer estimation method,and the parameter errors＇ influence on the accuracy of current observation value is repressed. The algorithm is simple and easy to implement.