风能转换系统执行器故障主动容错控制
Active fault-tolerant control of actuator failure for wind energy conversion system

提出了一种新颖的风能转换系统滑模主动容错控制策略. 针对风能转换系统执行器故障, 运用预测控制思想和 迭代算法, 设计了一种故障观测器. 在设定的优化时域长度内, 利用实际系统与故障观测器的输出差值, 通过反复迭代 运算, 不断地对虚拟故障信号进行调整, 使其能有效地拟合实际系统执行器故障, 并根据故障观测值实时调整滑模容错 控制器结构. 未发生故障时, 故障观测值为零, 系统在滑模控制器控制下稳定运行; 执行器发生故障时, 运用故障观测值 实时调整滑模容错控制项, 并用双曲正切函数代替符号函数, 消除抖动. 仿真实验结果表明, 滑模容错控制器下的系统 具有良好的容错能力, 提高了风能转换系统最大风能捕获效率.
A novel sliding-mode fault-tolerant active control strategy for wind energy conversion system is proposed. For actuator fault of wind energy conversion system, predictive control theory and iterative learning algorithm are introduced to design the fault observer. Within the preset optimizing time span, the introduced virtual fault is adjusted by the difference between the fault observer output and the actual system output through repetitive iteration, so that it can effectively fit the actual value of the actuator fault, and the structure of the sliding fault-tolerant controller is adjusted real-time according to the fault observed value. When there is no fault, the fault observed value is zero and the system is running stably under the control of the sliding-mode controller. When actuator failure occurs, sliding fault-tolerant controller is adjusted real-time on the basis of fault observed value, and the hyperbolic tangent function is used to substitute the sign function to eliminate chattering. Experimental results show that good fault tolerance ability of the system under the control of sliding-mode fault-tolerant controller can be guaranteed, improving the efficiency of maximum wind energy capture for wind energy conversion system.