基于单电流检测的电动变桨系统容错控制

针对电动变桨系统中常见的电流传感器故障，提出一种基于单电流检测的电动变桨系统变论域模糊容错控制方法。当变桨系统发生单个或两个电流传感器故障时，该方法利用直流母线电流传感器对所缺失的电流信息进行重构，保证三相电流能在任意两个相邻采样周期内得到及时更新，确保闭环系统稳定，并通过自适应阈值故障判断法完成故障相电流传感器的切换及容错。针对调制法引起的重构信号误差及电动变桨系统的主要控制目标，将变论域模糊控制方法应用于速度环，以改善系统抗负载扰动能力，提高容错系统鲁棒性。结果表明，该容错控制方法使得变桨系统在传感器故障情况下，牺牲部分系统性能后依然具有较理想的控制特性，并且该方法的正确性也得到了验证。

Fault tolerant control of electric pitch control system based on single current detection

In view of the current sensors failure in electric pitch system,a variable universe fuzzy fault tolerant control method of electric pitch control system based on single current detection is proposed.When there is single or two-current sensor fault occurs,based on the proposed method the missing current information can be reconstructed by using direct current (DC)bus current sensor and the three-phase current can be updated in time within any two adjacent sampling periods,so as to ensure sta-bility of the closed-loop system.And then the switchover and fault tolerant control of fault current sensor would be accom-plished by fault diagnosis method based on adaptive threshold judgment.For the reconstructed signal error caused by the modu-lation method and the main control target of electric pitch system,a variable universe fuzzy control method is used in the speed loop,which can improve the anti-disturbance ability to load variation,and the robustness of fault tolerance system.The results show that the fault tolerant control method makes the variable pitch control system still has ideal control characteristics in case of sensor failure although part of the system performance is lost,thus the correctness of the proposed method is verified.