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为了提高结式微波铁氧体开关的可靠性,对其失效模式(应力失效和热失效)进行了分析。采用应力-固有强度干涉模型进行机械应力失效分析,为机械结构CAD设计提供依据;以电磁仿真软件与热设计软件联动的方式进行热失效分析,为热量源、热分布的优化提供依据。依据分析结果,通过选择合理的材料参数、优化仿真模型、进行严格的工艺控制等手段的结合,可有效降低铁氧体开关的失效概率,提高可靠性。 相似文献
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本文针对某种SY053型号电连接器在设计生产实验中的失效现象,进行了失效分析。通过各项分析,阐述了出现失效的原因,分析了其失效机理。对产品设计、工艺、质量监控等环节提出了改善意见,提高产品的质量可靠性。 相似文献
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在功率器件的长期运行中,不断承受的温度和应力变化,加快了材料的疲劳失效。此外,新能源技术的发展对电力电子变流器的功率密度也提出了越来越高的要求,这些都给高可靠性功率器件的设计提出了新的挑战。失效物理(PoF)是在分析失效过程和疲劳机理的基础上,通过建模和仿真预测可靠性的一种方法,是研究疲劳失效的重要手段。本文首先介绍疲劳失效的基础理论。然后,从实验、仿真方法、解析模型和疲劳方式等方面介绍功率器件键合线和焊料层疲劳机理及主要研究进展,在此基础上,分析功率循环下功率器件的疲劳至失效全过程。最后,从多环境应力、动态载荷工况和可靠性设计三个方面,展望基于失效物理的电力电子可靠性研究方向。 相似文献
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以筒式钢球磨煤机为研究对象,在对其失效现象调研的基础上,对这些失效现象进行分析并对其对策措施进行研究,着重探讨了磨球失效,筒体螺栓失效,齿轮传动失效和电机轴失效等主要失效方式,综合考虑引起失效的各种原因,并在筒式钢球磨煤机设计、安装、诊断方面提出了有效、合适的对策措施,从而使其失效概率得到有效下降,以达到提高筒式钢球磨煤机安全可靠性的目的. 相似文献
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《The Electricity Journal》2020,33(1):106691
New technologies are transforming the US energy sector. Unprecedented opportunities lie ahead for local renewable energy development. Proper system and resource integration is therefore an economic imperative. Technical and economic integration will require policy alignment and collaboration among cities, counties, energy utilities (both gas and electric), and state government. There is also a potentially invaluable role for higher education in support of local planning and integration. State policy interventions in support of collaborative local renewable integration will be a necessary supplement to existing market and regulatory structures.States can affirm fundamental property rights that empower communities and citizens to actively support local climate action and adaptation. State policy can drive the evolution of existing market and regulatory structures to account for local differences and provide increased flexibility for local jurisdictions to address their diverse local resource opportunities and usage profiles.In parallel, states can encourage cities and counties to increase their capacity to take on vital new roles. State energy regulators will need to balance public interest in the economic health of the companies against they regulate against the opportunity to secure important benefits of local clean energy resource development and integration. They will need to create new processes for harmonizing and cross-leveraging progress toward diverse local goals with progress toward over-arching state goals.The key enabling factor will be a culture of collaboration between energy service providers and local governments. Collaborative local renewable integration can be empowered by state action that creates new points of coordination, integration and assistance.Through policy interventions, states can reduce or eliminate barriers to collaborative local renewable integration while capturing opportunities to bring together local government and energy utility capacities and data, plus capacities of universities, non-profit and utility training programs. 相似文献
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AbstractIn this paper, essential statistics demonstrating the increasing role of renewable energy generation are firstly discussed. A state of the art review section covers fundamentals of wind turbines and PV systems. Included are schematic diagrams illustrating the main components and system topologies and the fundamental and increasing role of power electronics as an enabler for renewable energy integration, and for the future power system and smart grid. Recent examples of research and development, including new devices and system installations for utility power plants, as well for as residential and commercial applications are provided. Fuel cells, solar thermal, wave generators, and energy storage systems are also briefly presented and illustrated. Challenges and future trends for 2025 are summarized in a table for on-shore and off-shore wind energy, solar power, including photovoltaic and concentering, wave energy, fuel cells, and storage with batteries and hydrogen, respectively. Recommended further readings on topics of electric power engineering for renewable energy are included in a final section. This paper also represents an editorial introduction for two special issues of the Electric Power Component and Systems Journal, 43(8–10) and 43(12), respectively. 相似文献
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Judith Schwartz 《The Electricity Journal》2018,31(9):34-37
Rate design serves objectives of cost recovery, market animation, and customer incentives. Yet in the quest to find the ‘perfect equitable rate,’ many rate designers and pilots overlook the diversity of consumer attitudes. AMI enables not only interval monitoring and controls, it allows alternative pricing plans, payment options, device adoption, and generation mixes reflecting individual priorities. Connecting consumer attitudes with a portfolio approach helps regulators and utilities achieve specific goals while improving satisfaction and engagement. 相似文献
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针对小型共轴折叠双旋翼飞行器结构特点、飞行原理进行分析,研究无人机运动学和动力学特性并建立数学模型,建立了无人机飞行器半实物飞行的动力性能和姿态角测试平台。该平台对飞行器机械振动、姿态角和噪声等性能分析。通过测试实验分析无人机不同旋翼转速产生的机械振动和噪声等特性,以及对陀螺仪和加速度计等MEMS传感器姿态解算结果的影响。测试实验表明:随着转速的增加振动幅度有所增加,该振动特性对噪声模型的建立和评估对无人机鲁棒性和抗干扰性提供新思路及有益借鉴。 相似文献
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1000 kV GIS变电所VFTO特性研究 总被引:28,自引:10,他引:18
为确保特高压输电工程的安全可靠,结合我国特高压输电试验示范工程计算分析了GIS和HGIS变电所的特快速瞬态过电压(VFTO)。研究表明,GIS变电所隔离开关开合短线时可能产生高达3p.u.左右的VFTO,对GIS本体绝缘和二次设备可能构成危害。研究了GIS隔离开关装并联分合闸电阻对限制VFTO的作用后,建议GIS变电所采用并联分合闸电阻(约500Ω),提出了并联分合闸电阻的相关参数的建议值;GIS变电所中的主变压器和GIS是经架空线相连接,在变压器上的VFTO不高;HGIS变电所中的VFTO不高,在允许范围内,其隔离开关可不装并联分合闸电阻。 相似文献
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从系统上介绍1种新兴骨干网络技术MPLS的体系结构,包括其基本概念、功能特性、结构组成及其内在关系。在MPLS体系结构中,标签是关键的技术手段。所有进入MPLS的包都必须加上标签,所有操作都围绕标签展开,对标签的分析、处理和根据标签内容进行包转发是在标签交换路由器LSR上完成的,LSR综合了传统路由器和交换机的优点,是MPLS的基本单元,带有标签的包在LSR间传输,所经过的LSR序列组成标签交换路径LSP。LSP建立和控制是MPLS体系结构的重要内容。在建立LSP的过程中,MPLS体系结构支持环路检测,以避免环路的产生而降低网络性能。MPLS体系结构能够利用LSP建立隧道,简化了传输控制,降低了设备复杂度,提高了网络性能。 相似文献
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从高压加热器的设计制造和运行等方面进行分析论证,阐述了压力损失对高加性能的影响.对高压加热器的管板和水封板结构及布置要点进行了设计,强调了高压加热器蒸冷段和疏冷段的密封性对设备安全运行的重要性.从运行方面进行分析,要加强控制水位和不凝结气体的排放,着重介绍了温升和温降速率对高压加热器运行性能的影响. 相似文献
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电纺丝技术及其应用 总被引:2,自引:0,他引:2
电纺丝技术是非牛顿流体的高聚物溶液在高压电场的作用下克服表面张力和粘弹性力,进行拉伸弯曲运动获得纳米到亚微米级纤维的一种技术。它作为高压与纳米技术的完美结合为传统高电压技术注入了新鲜血液。电纺丝纤维因其巨大比表面积和高孔隙率而得到组织工程、同轴电缆、药物缓释等多领域的关注。电纺丝参数影响方面的报道很多,而电纺丝领域当前最前沿研究及最新发现的报道还很少,故介绍了国内外电纺丝参数的研究成果及其最新动态,提出了电纺丝发展的几个瓶颈问题及解决方向。说明电纺丝技术的发展必然要先从理论模型和提高效率两方面入手并取得足够进展,该技术才能在生产实践中广泛应用。 相似文献