基于实时电流幅值的风电整流器故障诊断方法

直驱式风电系统整流器的开路故障会造成机侧交流电流半相缺失、直流侧电压波动、发电机转速波动等问题,严重影响风力发电系统的运行稳定性。文中提出一种基于实时电流幅值的永磁直驱风电系统整流器开路故障诊断方法,利用电机的运行特性来计算实时电流幅值,实现对故障的实时诊断和定位;将故障状态下的电流幅值与设定的电流幅值阈值进行比较,利用电流幅值异常所在区间来判定故障开关管位置,消除误差和外界条件变化带来的误诊断。实验结果验证了理论分析的正确性和故障诊断方法的有效性,通过与其他方法进行对比,验证了文中方法的检测速度和多管故障的诊断能力。

Fault diagnosis algorithm for wind power rectifier based on real-time current amplitude

The open circuit fault of the direct-drive wind power system converter causes problems such as half-phase loss of AC current on the machine side, voltage fluctuation on the DC side, fluctuation of generator speed, etc., which seriously affects the operational stability of the wind power generation system. A fault diagnosis method for open-circuit fault of permanent magnet direct-drive wind power system based on real-time current amplitude is proposed. The real-time current amplitude is calculated by using the running characteristics of the motor, so that the fault diagnosis algorithm can diagnose and locate the fault in real time. Comparing the current amplitude in the fault state with the set current amplitude threshold eliminates the misdiagnosis caused by errors. The position of the abnormality of the current amplitude is used to determine the position of the fault switch tube. Experimental results verify the correctness of the theoretical analysis and the effectiveness of the fault diagnosis method. Compared with other methods, the detection speed of the method and the diagnostic capability of multiple switch faults are verified.