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An Improved Open-Phase Fault-Tolerant DTC Technique for Five-Phase Induction Motor Drive Based on Virtual Vectors Assessment

机译:基于虚拟向量评估的五相感应电动机驱动改进的开放式容错DTC技术

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摘要

The multiphase machine (MM) drives are best suitable for safety-critical applications due to its inherent fault-tolerant capability. The fault-tolerant operation of MM drives is challenging and necessary for applications such as off-shore ship propulsion, highway electric vehicles, and more electric aircraft. A two-level voltage source inverter fed five-phase induction motor (FPIM) drive has been considered for the postfault performance assessment. In this article, an improved fault-tolerant direct torque control (DTC) technique is proposed for the FPIM drive based on virtual vector (VV)s assessment under the open-phase fault condition. The theoretical analysis is carried out to investigate the impact of VVs on the change in torque as well as flux response at different speeds and loading conditions. Based on this analysis, a modified lookup table, flux, and torque hysteresis bands are designed to improve the functioning of the fault-tolerant DTC of FPIM drive. The FPIM drive performance is analyzed and tested experimentally with an open-phase fault. Studies have confirmed the reliability and superiority of the proposed DTC controller over existing postfault solutions. In addition, the robustness of the FPIM drive at steady-state and dynamic operating conditions is evaluated from the given results, including the transition from pre-to-post fault operation.
机译:由于其固有的容错能力,多相机器(MM)驱动器最适合安全关键应用。 MM驱动器的容错操作是挑战性的,适用于岸上船舶推进,公路电动车和更多的电机等应用。两级电压源逆变器已被考虑为后跳性能评估考虑了五相感应电机(FPIM)驱动器。在本文中,提出了一种改进的容错直接扭矩控制(DTC)技术,用于基于开放相故障条件下的虚拟矢量(VV)评估FPIM驱动器。进行了理论分析,以研究VVS对不同速度和装载条件的扭矩变化的影响和焊剂响应。基于该分析,设计了一种改进的查找表,通量和扭矩滞段频带,以改善FPIM驱动器容错DTC的功能。通过开放相故障实验分析和测试FPIM驱动性能。研究证实了所提出的DTC控制器在现有的后跳解决方案上的可靠性和优越性。此外,从给定的结果评估FPIM驱动器处于稳态和动态操作条件的鲁棒性,包括从PRE-PRES故障操作的转换。

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