Abstract This article presents easy and robust Measurement Fault Detection and Isolation (MFDI) and Fault Tolerant Control (FTC) technique against grid voltage measurement failure, where scaling and dc-offset errors are considered. The proposed MFDI method is based on grid voltages orientation, which enables to generate two residuals. It does not require an extra hardware and is insensitive to system parameters variation; therefore, the model knowledge is not necessary. FTC technique is applied to overcome the fault. It is focused on Virtual Flux using Second-Order Generalized Integrator with a Frequency Locked-Loop. The estimated quantity is injected into the system control instead of the erroneous measurement. Simulation results prove the effectiveness of the proposed MFDI and FTC methods against different magnitude and type of grid sensor faults, and well identify the occurrence fault in each phase. In addition, it is characterized by a lower software capacity compared with model-based methods. An experimental platform was used to validate the obtained results and to show the reliability of the proposed techniques.

中文翻译：

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光伏并网系统故障诊断与虚拟磁通容限控制

摘要 本文介绍了针对电网电压测量故障的简单而稳健的测量故障检测和隔离 (MFDI) 和容错控制 (FTC) 技术，其中考虑了缩放和直流偏移误差。建议的 MFDI 方法基于电网电压方向，它能够生成两个残差。不需要额外的硬件，对系统参数变化不敏感；因此，模型知识不是必需的。应用FTC技术来克服该故障。它专注于使用具有锁频环的二阶广义积分器的虚拟通量。估计的量被注入系统控制而不是错误的测量。仿真结果证明了所提出的MFDI和FTC方法对不同程度和类型的电网传感器故障的有效性，并能很好地识别各相发生的故障。此外，与基于模型的方法相比，它的特点是软件容量较低。实验平台用于验证所获得的结果并展示所提出技术的可靠性。