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关键词： Insulated gate bipolar transistors (IGBT)  

摘要： Sensorless control under open-circuit faults is challenging for classic three-phase half-bridge motor drives. This paper proposes a method that exploits the correlation between back-electromagnetic force (back-EMF) and diode-through residual current in the IGBT open-circuit phase. First, the residual current model is developed, followed by a sampling strategy that unifies the model under different speeds. Using this unified model, a phase back-EMF observer is designed, enabling accurate postfault estimation of rotor speed and position. Experimental validation demonstrates the effectiveness of the proposed method, achieving an estimation error of 0.3 radians under steady-state conditions and 0.5 radians during acceleration and deceleration. © 2025 IEEE. All rights reserved.

关键词： 数字孪生   多物理仿真   科学机器学习   非侵入式模型降阶   算子推理  

摘要： 提出了一种新型数据物理双轮驱动的科学机器学习方法，可实现对大规模异质结构集成芯片的多物理系统超实时预测，构建真正具备物理内核的数字孪生模型。科学机器学习方法是一种非侵入式的模型降阶方法，主要包含时空快照降阶、低维算子推理两大模块。数十万自由度的IGBT电-热-力多物理耦合系统数值仿真实验表明，该方法仅使用前30%时域快照仿真数据作为训练样本，即可实现对后续场分布进行精准预测，均方根误差不超过8%。实验数据表明，有限元仿真用时25 h 15 min,基于科学机器学习的数字孪生模型构建时间仅需665.97 s,且数字孪生模型针对单一时间帧的多物理场推断时间仅需0.6 s。

关键词： 带式输送机   PLC控制器   变频器   故障率  

摘要： 针对矿井恶劣工况下矿用带式输送机频繁出现的停机、空载等问题，本文设计了基于PLC控制器和变频器的集控系统。该系统采用电机软启动技术，并构建了实时通信监控网络，显著降低了设备故障率，为矿山生产效益的提升提供了可靠保障。

关键词： 植被斑图   荒漠化   稳健性   最优控制   稀疏控制  

摘要： 建立了一类具有交叉扩散的植被-水反应扩散模型，将人类活动作为控制函数，研究了该植被模型的稀疏最优控制问题，从控制相关的植被斑图形成的角度揭示了如何通过人类活动提高生态系统的稳健性。给出了模型产生图灵斑图的条件，推导了一阶必要最优条件。最后通过数值模拟，从控制效果、控制误差和控制成本3方面验证了该控制方法的合理性以及控制策略的有效性。

关键词： 冷却塔风机   变频器   永磁同步直驱电机   节能降耗  

摘要： 通过把5 000t/d水泥生产线配套9MW余热发电的冷却塔风机，原来是由电机通过6m长的传动轴带动减速机驱动风机风叶转动，生产中减速机、电机震动大，塔体晃动，减速机机械密封经常损坏；在环境温度低的冬秋季节，单台冷却风机满足不了循环水系统的冷却，两台并列运行又造成过冷却。因此技改成变频永磁电机传动方式，在永磁电机电源控制柜内安装ABB变频器，实现永磁变频调节。技改后，在环境温度低的冬秋季，通过对变频永磁电机降频运行，节电可达62%～67%，其他季节，节电率 为 13%～35%，冷却塔晃动明显减小，同时设备检维修成本大大降低。

关键词： Permanent magnets  

摘要： This paper investigates the impact of hybrid memory motors on an IGBT-based inverter in the field-weakening region. Hybrid variable-flux motors have been introduced to overcome the limitations of conventional IPMSMs in traction applications. Different memory motor topologies have been introduced and compared in the literature. Yet, their impact on the drive inverter has not been reported. An existing prototyped ten-horsepower series-hybrid variable motor has been used as a case study in this paper. In the field weakening region, comparing the operation with partially demagnetized magnets to fully magnetized magnets, it is found that not only does the motor current decrease, but the motor power factor also improves. This unique finding of improved power factor operation positively impacts the inverter conduction loss. This has significant practical implications, suggesting that hybrid memory motors can lead to more efficient traction inverters. An air-cooled IGBT-based three-phase 750 VDC, 30 ARMS, is used in this study. In the simulation, the switch characteristics from the datasheet have been used for loss calculations. Also, the inverter power loss and efficiency have been measured at different speeds, loads, and magnetization states. A two to three percent improvement in inverter efficiency was noted in the high-speed region beyond two per unit speed. © 2025 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)  

摘要： The insulated gate bipolar transistor (IGBT) module is a critical component of the traction converter in rail transit vehicles, and its reliability is essential for the safe operation of these vehicles. Junction temperature is a key parameter affecting the performance and reliability of IGBTs. Existing onboard traction converters lack effective methods for real-time monitoring of the IGBT module's junction temperature. To address this issue, this paper proposes a reduction thermal modeling approach based on Galerkin projection for real-time assessment of the junction temperature in IGBT modules. The high-order heat conduction equations can be projected into a subspace by only inputting the converter's IGBT module's convection coefficient and power loss and utilizing an eigenvalue decomposition method based on singular value decomposition to extract basis vectors. This allows for generating a thermal field temperature map of the IGBT chip without additional external circuits or sensors, facilitating real-time and accurate evaluation of the IGBT module's junction temperature. Finally, a power cycling experimental platform for the IGBT module was established, and comparative experiments under various operating conditions were conducted. The experimental results validate the real-time and accuracy of the proposed method for assessing the junction temperature of IGBT modules. © 2015 IEEE.

关键词： Cascaded H-bridge (CHB)   driving cycle   driving cycle   energetic macroscopic representation (EMR)   energetic macroscopic representation (EMR)   electric vehicles   electric vehicles   loss evaluation   loss evaluation   modular multilevel converter (MMC)   modular multilevel converter (MMC)   multilevel inverter (MLI)   multilevel inverter (MLI)   Multilevelbattery storage system (BSS)   Multilevelbattery storage system (BSS)   SiC inverter   SiC inverter  

摘要： Electric Vehicles (EVs) based on Cascaded H Bridge (CHB) promise reduced consumption and improved modularity, repairability, resilience, and versatility. This study focuses on evaluating the efficiency of CHB inverters utilizing low-voltage Si MOSFETs to improve EV performance and range. Through a comprehensive system-level approach and modeling, a simulation of the CHB-based powertrain is developed and experimentally validated. Electrical and mechanical simulations are conducted separately and finally combined to streamline computation times. Subsequently, CHB-based EV is compared with standard two-level inverters (2LI) across different driving cycles, considering multiple sources of losses from the battery to the road. Despite increased battery losses, CHB proves reduction of consumption during urban driving cycles, making it a compelling choice for sustainable commuter vehicles.

关键词： 氙灯驱动电路   IGBT   CMOS   双回路调节   PID控制  

摘要： 本文提出了基于IGBT（绝缘栅双极型晶体管）与CMOS（互补金属氧化物半导体）双回路调节的氙灯驱动电路，旨在克服传统驱动电路的局限性。该设计通过将IGBT用于主要电流的控制，承载系统85%的电流负载，而CMOS则用于精确调节剩余的15%电流，以实现更高的调节精度与稳定性。此外，通过集成辐照度传感器和PID控制算法，系统能够实时调整氙灯的输出光强，确保光源的稳定性和一致性。通过合理分配电流负载和精确的反馈控制，不仅在功率管理上表现优异，还显著提高了系统的可靠性和氙灯的寿命，具有广泛的应用前景和推广价值。

关键词： LCL型并网逆变器   低开关频率   数字控制延时   稳定性分析   有源阻尼  

摘要： 数字控制延时是引起LCL型并网逆变器不稳定的原因之一。在大功率配电场景，并网逆变器主要工作于低开关频率条件，此时数字控制延时引起的振荡现象变得更为复杂。现有的有源阻尼方案主要面向LCL无源谐振峰附近频段的高频振荡问题，而较少地关注到低开关频率场景并网系统失稳的解决方案。本文首先分析了LCL型并网逆变器的稳定性，在低开关频率条件下，并网系统可能出现由LCL谐振峰和电流控制环路引起的双谐振频段。为了抑制双谐振频段诱发的振荡，本文提出并设计了一种基于双状态量反馈的有源阻尼控制方案，该方案能够在较宽的开关频率范围内保持系统的稳定性。通过PLECS仿真验证了所提出的有源阻尼方案在宽开关频率范围特别是低开关频率条件下的有效性。