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关键词： IGBT   Stress performance   Multiphysics coupling model   Thermal-mechanical-electromagnetic   Interaction mechanisms  

摘要： The press-pack Insulated Gate Bipolar Transistor (IGBT) is a critical power device in high-power electronic equipment and widely employed in flexible direct current (DC) transmission systems. Electrothermal stress fatigue are the leading cause of IGBT failures in engineering applications. However, previous studies mainly focused on the stress analysis from individual mechanical field in IGBT, thus the coupling effects of thermalmechanical-electromagnetic multiphysics fields on stress analysis are ignored, moreover, the thermal effect includes not only Joule heating but also electromagnetic losses, which lead to the interaction mechanisms on stress from various fields are currently unclear. In this paper, a novelty model of the IGBT considering mechanical field, thermal field, and electromagnetic field is proposed to comprehensively understand their inherent interaction mechanisms. Detailly, the paper explores the interaction mechanisms between fields by gradually coupling different fields. As a results, compared to the single mechanical field model, after thermal field is coupled into the mechanical field, the maximum stress steep rise to 26.2 MPa from 12.8 MPa. The electromagnetic field is further coupled into the mechanical-thermal fields, and the maximum temperature is increased by 6.2 %, which further leads to a 12.9 % increase in the maximum stress of mechanical field. The multiphysics coupling model has significantly narrowed the gap with the experimental results, the deviation in maximum stress has been reduced from 55.33 % in individual mechanical field to 2 % in Thermal-Mechanical-Electromagnetic multiphysics fields. The results indicate that the sequential coupling of thermal and electromagnetic fields significantly enhances the accuracy of stress analysis of IGBT.

关键词： Reliability   Inverters   Topology   Reliability engineering   Modulation   Insulated gate bipolar transistors   Motors   Heat sinks   Cables   Multilevel inverters   DC transmission   design for reliability   environmental stressors   long cables   motor drives   insulated gate bipolar transistors  

摘要： Throughout many Industries, pulse width modulation voltage source inverters (PWM-VSI) are commonly utilized within adjustable speed drives (ASD) to control induction motors. For many application within various heavy industries, the cables connecting the output of some ASDs to their motor loads can be extremely long. These long cable applications can cause several operational challenges. As an innovative solution, an alternative system configuration has been previously proposed, in which the rectifier is kept in its typical location, and the inverter bridge and DC bus capacitors are installed near the driven motor. The long cables running from the ASD to the motor are used as a DC transmission line, mitigating the high-frequency problems resulting from the inverter-cable-motor interaction. However, new concerns regarding the reliability of the power devices arise once the inverter is installed in harsh ambient conditions. In this context, this work proposes a reliability analysis of such drive configuration, applying the physics of failure (PoF) approach combined with the design for reliability methodology to carry out the design adjustments to achieve the reliability and minimizing implementation costs required for the application, focusing on the inverter IGBT modules. The results show that a three-level active neutral point clamped inverter (3L-ANPC) topology, applying two pulse width modulation (PWM) strategies and 400 Amp.-6.5 kV IGBTs, would be the most appropriate from this study's reliability and feasibility analyses.

关键词： dICE/dt   Miller capacitance   Turn-on energy loss (EON)   Short-circuit tolerance time (TSC)   Turn-off loss (EOFF)  

摘要： This paper proposes a novel Floating Dummy IGBT (FD-IGBT) featuring integrated N- and P-type Schottky Barrier Diodes (SBDs) and investigates its performance through simulation. During the turn-on transient, hole accumulation in the floating P-base region elevates its quasi-Fermi potential, triggering the turn-on of the two seriesconnected SBDs and thereby clamping the voltage of the floating P-base region. This mechanism effectively reduces the Miller capacitance and significantly suppresses the reverse gate charging current from the floating Pbase region to the gate. This reduces turn-on energy loss (EON) and improves dICE/dt controllability. Under shortcircuit conditions, the SBDs adaptively turn on, enhancing short-circuit tolerance time (TSC). During turn-off state, the SBDs accelerate hole extraction, reducing turn-off time and energy loss (EOFF). TCAD simulations show that, at the same EON + EOFF (43.8 mJ/cm2), the proposed FD-IGBT reduces dICE/dt by 88.2 % compared to conventional IGBTs. At the same dICE/dt (2.1 kA/mu s), it reduces EON + EOFF by 53.4 %. Furthermore, the shortcircuit withstand time (TSC) of the proposed device is improved by 169 % compared to conventional IGBTs.

关键词： TSEP   Temperature distribution   Emitter pad design   Repetitive switching   Internal gate resistance   Artificial front-side aging  

摘要： This work offers a comprehensive study on temperature determination and development of IGBTs via temperature-sensitive parameters (TSEPs) during repetitive switching events. The obtained information is discussed and judged with respect to accuracy for different device technologies. This evaluation is extended by the aspect of artificial front-side aging for different emitter-pad designs. For two different designs investigated, no decreased switching robustness could be verified, even beyond the AQG 324 [1] lifetime border, which is defined by a certain forward voltage drop increase.

关键词： IGBT   状态监测   储能变流器   卡尔曼滤波  

摘要： 功率器件是储能变流器实现电能变化的核心元件，其特性出现疲劳老化会使储能变流器损耗增加，运行温度上升，引发故障停机或设备损坏，甚至诱发电池单元的安全问题。IGBT集电极-发射极饱和压降Vce是反映IGBT健康状态的重要指标，IGBT饱和压降监测可有效观测IGBT的运行健康状态。基于数据驱动建模的监测算法对数据质量与规模依赖性较大，数据质量不达标会引起数据模型的显著偏差。针对上述问题，该文提出结合数据优化预处理的非线性最小二乘曲线拟合算法，用以实现对IGBT饱和压降Vce的精确辨识。文中建立了储能变流器的离散化数学模型，并且考虑IGBT死区效应的影响，使模型精度更高。同时为了减少采样噪声对辨识准确性的影响，对采集数据进行预处理，构建卡尔曼滤波观测器以减少数据偏差与噪声干扰。最后，所提IGBT饱和压降监测方法通过Matlab/Simulink软件仿真和实验验证了其正确性和有效性。

关键词： 变频器   故障诊断   电容衰减   输出电压不稳   维修策略  

摘要： 变频器是工业自动化系统中的一项关键性设备,其被广泛用于电机调速功能的实现。但在这一设备的长期运行及复杂的环境影响下,容易出现各种故障,影响设备的稳定性和生产效率。因此,本文从变频器常见故障入手进行分析,探讨其故障原因,以此提出有效的故障诊断与维护方案。进而为变频器故障的预防、诊断和维护提供技术指导。

关键词： 钻井平台   变频器   谐波抑制   电气系统稳定性  

摘要： 本文专门针对钻井平台变频器在运行过程中出现的谐波问题进行了深入探讨,强调了谐波抑制技术的重要性,并提出了相应的实施策略。通过深入剖析变频器的工作原理和其谐波产生机理,评价谐波对钻井平台电气系统造成的影响。本文对现有谐波抑制技术类型、原理及在钻井平台上的应用进行系统梳理,指出现有技术对极端环境的限制。鉴于此,本文提出一种创新谐波抑制技术方案以综合分析为依据,并用试验证明该技术方案有效可行。最后对钻井平台电气系统技术方案的运用与集成进行讨论,以期为促进钻井平台电气系统稳定安全运行提供强有力的支持。

关键词： 高压变频器   煤矿电力系统   优化设计   节能降耗   设备防护  

摘要： 随着煤矿行业的智能化与节能技术发展,高压变频器作为煤矿电力系统的重要组成部分,已广泛应用于风机、水泵、提升机等关键设备。其优化设计不仅能提高电能利用效率,还能降低设备损耗,增强系统稳定性。本文探讨了高压变频器的工作原理、优化设计策略以及在煤矿电力系统中的实际应用,并结合煤矿特殊的工作环境,对变频器的防爆要求、设备保护措施及维护管理策略进行了深入分析。研究表明,合理优化高压变频器的选型、控制算法及维护管理,不仅能有效提升煤矿电力系统的安全性和稳定性,还能降低能源消耗,为煤矿生产提供高效可靠的技术支持。

关键词： 直接转矩控制   升船机   多电机同步拖动系统  

摘要： 升船机在水利水电工程和内河航运中具有十分重要的地位,能帮助船舶克服水位落差,顺利通航。而多电机同步拖动系统作为升船机的核心部分,其性能的优劣直接关系到升船机运行的安全性和稳定性。传统的拖动控制方式在某些方面已难以满足现代升船机日益增长的高性能需求,在此背景下,直接转矩控制凭借其独特的优势,逐渐成为升船机多电机同步拖动系统领域的研究热点和发展方向。

关键词： 高压直流输电   IGBT   驱动技术  

摘要： 鉴于全球对能源的需求持续上升以及可再生能源的普及,高压直流输电(HVDC)技术因其出色的输电效率和长距离传输能力而受到了广泛关注。在HVDC系统里,绝缘栅双极晶体管(IGBT)被视为核心的功率转换部件,因此其驱动和保护技术的进一步优化显得尤为关键。文章对HVDC系统IGBT驱动及保护技术所面临的多种问题进行分析,并给出优化策略。通过优化开关控制算法,使用先进保护电路,完善驱动电路设计及引进高效热管理方案等措施可有效增强IGBT性能,继而提高HVDC整体效率及可靠性。