Soliman Hisham M, Bayoumi Ehab H E, El-Sheikhi Farag A, De Santis Michele
Department of Electrical Power Engineering, Faculty of Engineering, Cairo University, Cairo 11562, Egypt.
Department of Mechanical Engineering, Faculty of Engineering, The British University in Egypt, El Sherouk City, Cairo 11837, Egypt.
Sensors (Basel). 2023 Aug 14;23(16):7160. doi: 10.3390/s23167160.
System stability deterioration in microgrids commonly occurs due to unpredictable faults and equipment malfunctions. Recently, robust control techniques have been used in microgrid systems to address these difficulties. In this paper, for DC-islanded microgrids that have sensors faults, a new passive fault-tolerant control strategy is developed. The suggested approach can be used to maintain system stability in the presence of flaws, such as faulty actuators and sensors, as well as component failures. The suggested control is effective when the fault is never recognized (or when the fault is not being precisely known, and some ambiguity in the fault may be interpreted as uncertainty in the system's dynamics following the fault). The design is built around a derived sufficient condition in the context of linear matrix inequalities (LMIs) and the attractive ellipsoid technique. The ellipsoidal stabilization idea is to bring the state trajectories into a small region including the origin (an ellipsoid with minimum volume) and the trajectories will not leave the ellipsoid for the future time. Finally, computational studies on a DC microgrid system are carried out to assess the effectiveness of the proposed fault-tolerant control approach. When compared with previous studies, the simulation results demonstrate that the proposed control technique can significantly enhance the reliability and efficiency of DC microgrid systems.
微电网中的系统稳定性恶化通常是由不可预测的故障和设备故障引起的。近年来，鲁棒控制技术已被应用于微电网系统以解决这些难题。本文针对存在传感器故障的直流孤岛微电网，提出了一种新的无源容错控制策略。该方法可用于在存在诸如执行器和传感器故障以及部件失效等缺陷的情况下维持系统稳定性。当故障未被识别（或者当故障情况不明确，且故障中的一些模糊性可被解释为故障后系统动态的不确定性）时，所提出的控制方法依然有效。该设计基于线性矩阵不等式（LMI）和吸引椭球技术导出的充分条件构建。椭球稳定的思想是将状态轨迹带入包含原点的一个小区域（一个体积最小的椭球），并且轨迹在未来时间不会离开该椭球。最后，对一个直流微电网系统进行了计算研究，以评估所提出的容错控制方法的有效性。与先前的研究相比，仿真结果表明所提出的控制技术能够显著提高直流微电网系统的可靠性和效率。
