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限电管理系统的设计
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作者 祝瑞花 刘凌 《信息技术与信息化》 2007年第3期114-115,共2页
本文提出了一种限电管理系统的设计,将限电管理系统分为用户管理部分、电厂管理部分、与SCADA的接口三个部分,可以方便适应用户的变化,进行用户负荷管理,电厂处理管理,与SCADA系统的接口方便的实现在线控制。实践证明,该系统具有很好的... 本文提出了一种限电管理系统的设计,将限电管理系统分为用户管理部分、电厂管理部分、与SCADA的接口三个部分,可以方便适应用户的变化,进行用户负荷管理,电厂处理管理,与SCADA系统的接口方便的实现在线控制。实践证明,该系统具有很好的扩展性和适应性。 展开更多
关键词 限电管理系统
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基于ZigBee技术的智能限电控制系统设计与实现 被引量:6
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作者 杨黎 杨琳芳 吴宗泽 《测控技术》 CSCD 北大核心 2014年第7期65-68,共4页
针对集体宿舍限制使用大功率恶性负载、限电管理等问题,从安全用电、智能管理等角度,提出了一种基于无线网络控制的智能限电控制系统方案。该系统以CC2530射频芯片、互感器等组成限电控制节点,以STM32F103处理器、ENC28J60以太网控制芯... 针对集体宿舍限制使用大功率恶性负载、限电管理等问题,从安全用电、智能管理等角度,提出了一种基于无线网络控制的智能限电控制系统方案。该系统以CC2530射频芯片、互感器等组成限电控制节点,以STM32F103处理器、ENC28J60以太网控制芯片等组成ZigBee无线网关;通过无线网络和互联网,上传违章用电用户ID或下传恢复上电指令,实现限电控制的智能管理。该系统具有低功耗、易组网、稳定性好等优点,可广泛应用于学生公寓、工厂宿舍等电房。 展开更多
关键词 ZIGBEE CC2530 STM32 限电管理
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电动车是城市交通的救星——访清华大学教授、中国自行车协会电动车首席专家马贵龙
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作者 何兰 《电动自行车》 2007年第2期5-7,共3页
“将来中国城市道路交通体系应该是这样一种格局:绝大部分是有轨电车、无轨电车,其次是电动自行车和电动摩托车,而那时的小轿车不仅是以电作为动力,而且在整个道路上只是一个点缀。”对于电动车将来在道路上的“地位”,做了20多年... “将来中国城市道路交通体系应该是这样一种格局:绝大部分是有轨电车、无轨电车,其次是电动自行车和电动摩托车,而那时的小轿车不仅是以电作为动力,而且在整个道路上只是一个点缀。”对于电动车将来在道路上的“地位”,做了20多年电动自行车研究的清华大学教授马贵龙显得很有信心,“现在一些城市实行‘禁电’政策,那是某些管理层的决策失误,只有电动车才是解决城市交通拥挤的唯一救星。” 展开更多
关键词 动车:污染问题 ”:道路管理
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Reducing the Short Circuit Levels in Kuwait Transmission Network
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作者 W. AI-Hasawi M. Gilany 《Journal of Energy and Power Engineering》 2010年第5期45-51,共7页
This paper describes the study analysis performed to evaluate the available and potential solutions to control the highly increasing short circuit (SC) levels in Kuwait power system. The real Kuwait High Voltage (H... This paper describes the study analysis performed to evaluate the available and potential solutions to control the highly increasing short circuit (SC) levels in Kuwait power system. The real Kuwait High Voltage (HV) network was simulated to examine different measures at both 275 kV and 132 kV stations. The simulation results show that the short circuit currents exceed the permissible levels (40 kA in the 132 kV network and 63 kA in the 275 kV network) in some specific points. The examined measures include the a study on changing the neutral point policy, changing some lines from alternating current (AC) to direct current (DC), dividing specific bus bars in some generating stations and applying current limiters. The paper also presents a new plan for the transmission network in order to manage the expected increase in short circuit levels in the future. 展开更多
关键词 Short circuit level network splitting fault current limiter power transmission planning.
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Realization of low contact resistance close to theoretical limit in graphene transistors 被引量:5
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作者 Hua Zhong Zhiyong Zhang Bingyan Chen Haitao Xu Dangming Yu Le Huang Lianmao Peng 《Nano Research》 SCIE EI CAS CSCD 2015年第5期1669-1679,共11页
Realizing low contact resistance between graphene and metal electrodes remains a well-known challenge for building high-performance graphene devices. In this work, we attempt to reduce the contact resistance in graphe... Realizing low contact resistance between graphene and metal electrodes remains a well-known challenge for building high-performance graphene devices. In this work, we attempt to reduce the contact resistance in graphene transistors and further explore the resistance limit between graphene and metal contacts. The Pd/graphene contact resistance at room temperature is reduced below the 100 Ω·μm level both on mechanically exfoliated and chemical-vapor-deposition graphene by adopting high-purity palladium and high-quality graphene and controlling the fabrication process to not contaminate the interface. After excluding the parasitic series resistances from the measurement system and electrodes, the retrieved contact resistance is shown to be systematically and statistically less than 100 Ω·μm, with a minimum value of 69 Ω·μm, which is very close to the theoretical limit. Furthermore, the contact resistance shows no clear dependence on temperature in the range of 77-300 K; this is attributed to the saturation of carrier injection efficiency between graphene and Pd owing to the high quality of the graphene samples used, which have a sufficiently long carrier mean-free-path. 展开更多
关键词 graphene field-effect transistors contact resistance metal-graphene interface transfer length method
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