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关键词： IGBT模块   低电压穿越(LVRT)   热管理策略   电流谐波   开关频率   硬件保护电路  

摘要： 低电压穿越(LVRT)期间,电压骤降会导致双馈风电机组(DFIG)电流严重畸变,变流器中IGBT模块的瞬时功耗急剧上升,器件过温失效风险剧增。通过仿真实验分析了LVRT工况下变流器的温升特性,提出了一种结合硬件保护电路与开关频率调节的结温治理方法。引入投资回报比(ROI)作为开关频率选取依据,平衡温升与电流总谐波失真(THD)增长率。采用量子粒子群优化(QPSO)算法确定最优开关频率,并与卸荷撬棍电路协同,有效抑制了温升。仿真结果表明,网侧电压跌至0.3 p.u.时,所提策略使IGBT故障瞬间温升波幅降低37%,穿越期间温升波幅降低58%,有效抑制了LVRT工况下的温升现象。

关键词： PLC   变频器   造纸机   电气传动控制系统  

摘要： 随着自动化技术的快速发展,PLC与变频器的集成应用已经成为造纸机高效运行的基础应用之一。PLC具有灵活的编程方式与强大的逻辑控制能力,可以实现造纸生产环节的监测与控制,而变频器则在调速和节能方面展现出了显著的优势。二者的结合,提高了造纸机械设备的运行效率,还增强了系统的可靠性和适应性。基于此,从造纸机机械结构入手,讨论造纸机电气传动系统需求以及造纸机电气传动系统集成应用,以期为造纸企业提供更多的竞争优势。

关键词： 轴带   直驱   发电机   变频器  

摘要： 随着国际海事组织关于MARPOL附则Ⅵ修正案的法规于2023年初始实施,部分船舶已经开始采用轴带发电系统,其中永磁直驱轴带发电机及双PWM变频器的组合使用,是轴带发电方案中一种性价比较高的技术方案。基于永磁直驱轴带发电技术,重点介绍了AS710M产品特点,通过实际应用案例分享了产品实测数据及达成的经济效益,填补了目前国内文献关于永磁直驱轴带发电实船应用方面的材料空白。

关键词： 塔式起重机   有限元   主动控制   模态控制   振动  

摘要： 文中研究了基于塔式起重机复杂有限元模型的模态振动控制器,设计了塔式起重机结构的控制模型、传感器及作动器安装位点,利用模态空间下塔式起重机的振动是解耦的,根据模态分析结果提取了需要控制的模态,应用模态变换方法对塔式起重机进行模态降价和模态坐标提取,并设计了模态空间的最优控制器,同时对控制效果进行了仿真。时域及频域分析结果显示,在控制器的作用下塔臂及塔身的振动得到快速衰减,但仍存在控制器参数难以调节、控制器容易失稳等局限性,可通过适当增加传感器和作动器的方法进行优化。

关键词： FS-IGBT   SC2   Circuit parameters   Ruggedness   tsc  

摘要： Field-stop insulated gate bipolar transistors (FS-IGBTs) are extensively utilized in various power applications because of their lower conduction and switching losses. However, as application conditions become more demanding, there is an increasing need for improved reliability and ruggedness of the FS-IGBT. Short circuits are one of the most common failures of FS-IGBTs. Under these circumstances, the device may conduct unexpectedly or operate with minimal bus parasitic inductance, leading to a significant increase in the device's junction temperature. Failure to turn off the FS-IGBT promptly may result in thermal runaway and device burnout. Shortcircuit type 2 (SC2) is more frequently observed in practical FS-IGBT applications than short-circuit type 1 (SC1). Nevertheless, the majority of current research primarily concentrates on SC1, with relatively limited studies on SC2 of FS-IGBTs. This study aims to investigate the circuit parameters of SC2 and comprehensively analyze the impact of each parameter on SC2. The experimental results indicate that the bus voltage VDC, gate voltage VG, and temperature TC significantly affect the SC2 performance of the FS-IGBT. Therefore, a moderate decrease in VDC, VG, and TC can effectively enhance the ruggedness of SC2 and the short-circuit withstand time tSC of the device.

关键词： S -parameters   Power modules   IGBT   Wire bonding failure  

摘要： This study deals with the development of a wide-frequency-band characterization for failure analysis of power modules, focusing on a specific IGBT packaging. It is highlighted that different characteristics of the IGBT and the packaging can be distinguished depending on the frequency band analyzed, enabling the detection of potential failure modes. Particularly, for the power bond-wire lift-off mechanism, the paper emphasizes the importance of considering high-frequency analysis above 200 MHz. It is enabled through the definition of a failure indicator, demonstrating the ability to highlight partial failures as well as to localize them.

关键词： Insulated gate bipolar transistors   Solid modeling   Observers   Temperature sensors   Monitoring   Finite element analysis   Thermal analysis   IGBT module   uncertainty   robustness   junction temperature   thermal monitoring   reliability  

摘要： Dynamic temperature monitoring at critical locations of IGBT modules is a key means to improve the reliability of high-power converters. However, most existing thermal model-based methods suffer from temperature estimation errors due to model parameter variations and loss calculation errors. To address this problem, based on the reduced-order thermal model, an H-infinity observer-based robust 3-D thermal monitoring method for IGBT modules is proposed in this paper. Through the optimized design of the observer feedback gain, the thermal model and real-time temperature information are effectively combined, which reduces the temperature estimation error in the worst case. Thus, the proposed method is more robust to model parameter uncertainty and loss error than the conventional temperature observers. Experiment validations of the proposed H-infinity observer and conventional observers are provided. The results demonstrate that the proposed observer achieves the highest temperature estimation accuracy under various system uncertainties, making it an effective solution for reliable online thermal monitoring of IGBT modules over the whole life cycle.

关键词： Inverters   MOSFET   Switches   Silicon   Semiconductor diodes   Insulated gate bipolar transistors   Inductance   Costs   Silicon carbide   Load modeling   Electric-vehicle   hybrid-switch   IGBT   silicon diode   SiC-MOSFET   WLTC   SiC/Si  

摘要： The central focus of this research is to enhance the efficiency of a traction hybrid switch inverter designed to operate at a DC-link voltage of 400V. This enhancement is accomplished through the integration of discrete 650V Si-IGBTs and freewheeling diodes in conjunction with 650V SiC-MOSFETs, forming a parallel configuration. The study describes an innovative approach involving the introduction of an additional inductance to decouple the SiC-MOSFET half-bridge from the IGBT/Si-Diode half bridge. This decoupling methodology effectively mitigates the turn-on losses of the active SiC-MOSFET and the turn-off losses of the passive Si-diode, resulting in a notable reduction in overall losses within the hybrid-switch inverter compared to a non-decoupled configuration. The comprehensive assessment of the system losses within the hybrid-switch inverter is conducted through simulations and subsequently validated via experimental setups. These experimental setups encompass a double pulse test configuration and an H-bridge inverter test setup, ensuring the accuracy and reliability of the research findings. After experimental validation of the simulation model the average losses of a driving cycle are calculated, to find the best decoupling inductance value.

关键词： Temperature measurement   Insulated gate bipolar transistors   Monitoring   Temperature sensors   Threshold voltage   Logic gates   Junctions   Voltage measurement   Current measurement   Semiconductor device measurement   Junction temperature   press-pack insulated gate bipolar transistor (PP IGBT)   reliability   temperature monitoring   virtual threshold voltage  

摘要： Online junction temperature (T-j) monitoring of press-pack insulated gate bipolar transistor (PP IGBT) is of great significance for improving reliability in high voltage and high power applications. Due to the complexity of press-pack packaging, the conventional T-j monitoring method is difficult to online monitor T-j of PP IGBT. In this article, the virtual threshold voltage (V-v(,th)) is proposed as a novel temperature sensitive electrical parameter. A simple V-v(,th) monitoring circuit which does not affect the normal operation of converter is proposed. Within one switching cycle of PP IGBT, T-j is online monitored accurately. The feasibility of proposed online T-j monitoring method is verified based on a half-bridge inverter. A thermocouple is sealed into an emitter molybdenum to obtain IGBT chip temperature. A good linear relationship between V-v(,th) and T-j is analyzed. Pearson correlation coefficients of fitting results at 0.31 kN and 4.30 kN are -0.99871 and -0.99970, respectively. The accuracy of proposed method is validated by comparing the temperature measured by thermocouple with the temperature calculated based on V-v(,th). The error between the measured temperature and the calculated temperature is within 2.5 degrees C. The online experimental results demonstrate that the proposed method can accurately monitor T-j of PP IGBT.

关键词： Motors   Torque   Magnets   Inverters   Demagnetization   Magnetization   Memory management   Rotors   Voltage   Neodymium   Inverter loss   memory motors   permanent magnet   traction inverter   variable-flux IPMSM  

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 V-DC, 30 A(RMS), 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.