An equivalent-input-disturbance approach for current sensor faults estimation and rejection in permanent magnet synchronous motor drives
An equivalent-input-disturbance approach for current sensor faults estimation and rejection in permanent magnet synchronous motor drives
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DOI：
10.1177/0142331219869721
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发表时间：
2020-02
影响因子：
1.8
通讯作者：
Gang Huang;Zhengtan Li;E. F. Fukushima;Changfan Zhang;Jing He
中科院分区：
文献类型：
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作者：
Gang Huang;Zhengtan Li;E. F. Fukushima;Changfan Zhang;Jing He
电流传感器是永磁同步电机驱动系统中常用的一种传感器。如果电流传感器发生意外故障，可能会导致反馈电流偏差和系统退化，对永磁同步电机工业系统的安全运行极为不利。提出了一种永磁同步电机驱动系统电流传感器故障的估计和抑制策略。通过构建新的系统对象，将电流测量电路中的传感器故障视为系统扰动。基于等效输入干扰（EID）理论，设计了滑模观测器和改进的等效输入干扰估计器。因此很容易获得电流传感器等效输入故障的准确估计。故障抑制是通过从控制输入中减去等效输入故障来实现的。这使得PMSM系统中的现有控制器即使发生当前传感器故障也能继续正常工作。详细讨论了系统的存在性分析和稳定性证明。最后通过不同故障实例和硬件在环实验验证了该方法的有效性。
Current sensor is commonly used in a permanent magnet synchronous motor (PMSM) drive system. Occurrence of unexpected current sensor faults may cause feedback currents deviation and system degradation, which can be extremely detrimental to the safety of the industrial system with PMSM. This paper presents an estimation and rejection strategy of current sensor faults for a PMSM drive system. Sensor faults in current measurement circuits are treated as system disturbances by constructing a new system plant. A sliding mode observer and an improved equivalent-input-disturbance (EID) estimator are designed for the plant based on the EID theory. Accurate estimates of the current sensor equivalent-input-faults are thus obtained readily. Faults rejection is performed by subtracting the equivalent-input-faults from the control input. This allows an existing controller in a PMSM system to continue to function normally even a current sensor fault occurs. An existence analysis and stability proof are also discussed in detail for the system. Finally, different faults examples and a hardware-in-the-loop experiment are given to demonstrate the efficiency of the method.