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在线课程下的自适应查询调度算法 被引量:12
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作者 侯勇 吾守尔.斯拉木 +1 位作者 于炯 周艳慧 《计算机应用》 CSCD 北大核心 2010年第4期1008-1010,1018,共4页
在线课程系统中,针对如何将查询请求充分映射到有限资源上这一热点问题,设计基于系统负载平衡的自适应查询处理器。该处理器综合考虑服务器、带宽等性能指标,建立由服务资源单元和远程查询消耗单元组成的基于资源负载平衡的查询期望代... 在线课程系统中,针对如何将查询请求充分映射到有限资源上这一热点问题,设计基于系统负载平衡的自适应查询处理器。该处理器综合考虑服务器、带宽等性能指标,建立由服务资源单元和远程查询消耗单元组成的基于资源负载平衡的查询期望代价矩阵,并结合利用Min-Min和Max-Min算法的优点,提出新的自适应查询调度算法(A-MM)。实验表明A-MM有较好的执行效率和平衡负载能力。 展开更多
关键词 大规模在线课程 自适应查询调度 负载平衡 负载消耗系数 MIN-MIN算法 Max-Min算法
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基于S7-200PLC光伏供电自动切换控制系统 被引量:3
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作者 孟彦京 刘青 《现代电子技术》 北大核心 2018年第2期107-110,共4页
光伏发电在实际应用中用户端的负载是不断变化的,当一台变压器下有多个用户且只有单个用户使用光伏时,如果光伏输出电流大于负载消耗时,会发生逆流现象,这种现象不利于同一变压器下各个用户之间电费的结算。为了解决这一问题,通过S7-200... 光伏发电在实际应用中用户端的负载是不断变化的,当一台变压器下有多个用户且只有单个用户使用光伏时,如果光伏输出电流大于负载消耗时,会发生逆流现象,这种现象不利于同一变压器下各个用户之间电费的结算。为了解决这一问题,通过S7-200PLC设计一套自动切换系统,采集负载端的电流信号,根据电流变化情况通过PLC控制并网逆变器的输出负载对象,最终达到了光伏并网逆变器和负载之间的最佳匹配,消除逆流现象,便于用户之间电费的结算。此系统正式投入使用以来一直处于正常运行状态,并且达到了预期的效果。 展开更多
关键词 光伏发电 PLC控制 负载消耗 自动切换 消除逆流 并网逆变器
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发电机功率自反馈试验法的分析研究 被引量:1
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作者 张品福 《节能》 北大核心 1996年第2期10-13,共4页
本文介绍了发电机试验的负载消耗法、功率自反馈法、电动发电机组反馈法与变流器反馈法,并利用电机拖动中能量的传输关系,分析了这几种试验的节电效果,又通过对ZF—18型直流发电机的试验,估算了效果最佳的功率自反馈法的节电量... 本文介绍了发电机试验的负载消耗法、功率自反馈法、电动发电机组反馈法与变流器反馈法,并利用电机拖动中能量的传输关系,分析了这几种试验的节电效果,又通过对ZF—18型直流发电机的试验,估算了效果最佳的功率自反馈法的节电量,最后得出几个重要结论,并为厂家在如何选择较好的发电机试验方案时,提供了重要的参考依据。 展开更多
关键词 负载消耗 功率 自反馈法 发电机 节电
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Survivable Routing Protocol for Green Wireless Mesh Networks Based on Energy Efficiency 被引量:1
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作者 YU Yinpeng PENG Yuhuai LIU Yejun GUO Lei SONG Meng 《China Communications》 SCIE CSCD 2014年第8期117-124,共8页
This paper proposes a new Energyefficient Survivable Routing Protocol(ESRP)based on solar energy and wind mixed for power supply in green wireless mesh networks(WMNs).The ESRP combines hop penalty strategy and floodin... This paper proposes a new Energyefficient Survivable Routing Protocol(ESRP)based on solar energy and wind mixed for power supply in green wireless mesh networks(WMNs).The ESRP combines hop penalty strategy and flooding delaying strategy to improve the performances of traditional routing protocol.This paper uses QualNet to simulate and verify the performances of proposed ESRP.Compared with the traditional routing protocol,the simulation results show that the energy utilization of ESRP is more efficient by 13%.At the same time,ESRP is more load-balanced to postpone the appearance of the first energy depletion node and reduce the number of energy depletion nodes,and thus it effectively improves network survivability. 展开更多
关键词 wireless mesh networks ROUTING ENERGY-EFFICIENT SURVIVABILITY
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An Experimental Study for Inverse Load Reconstruction 被引量:1
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作者 Bin Yang 《Journal of Energy and Power Engineering》 2012年第11期1826-1834,共9页
This paper performs an experimental study for inverse load reconstruction. By measuring and analyzing the load characteristics of different home and office electric devices, the author shows that a reconstruction of t... This paper performs an experimental study for inverse load reconstruction. By measuring and analyzing the load characteristics of different home and office electric devices, the author shows that a reconstruction of the individual power consumption of different loads from the total measurement of a single power meter is possible. 展开更多
关键词 Load measurement load analysis inverse load reconstruction NIALM.
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Peak Load Evaluation Based on the Accumulated Annual Energy
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作者 Nabeel Tawalbeh Reyad E1-Khazali 《Journal of Energy and Power Engineering》 2012年第11期1758-1763,共6页
This paper presents a nonlinear approach to estimate the consumed energy in electric power distribution feeders. The proposed method uses the statistical solution algorithm to analyze the active energy monthly consump... This paper presents a nonlinear approach to estimate the consumed energy in electric power distribution feeders. The proposed method uses the statistical solution algorithm to analyze the active energy monthly consumption, which enables one to estimate the energy consumption during any period of the year. The energy readings and the normalized accumulated energy profile are used to estimate the hourly consumed active power, which can be used for future planning and sizing the equipment of the electrical system. The effectiveness of the proposed method is demonstrated by comparing the simulated results with that of real measured data. 展开更多
关键词 Peak load accumulated energy diversity factor load pattern conversion factor load estimation.
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Load Management Scheme Using Air Conditioning Electric Power Consumption and Photovoltaic Power System Generation
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作者 Zvonimir Klaic Damir Sljivac Kresimir Fekete Zorislav Kraus 《Journal of Energy and Power Engineering》 2014年第11期1926-1932,共7页
In the last few decades, in the world and also in the European Union, considerable resources had been invested in the rapid development of renewable energy sources and distributed generation in general. At the same ti... In the last few decades, in the world and also in the European Union, considerable resources had been invested in the rapid development of renewable energy sources and distributed generation in general. At the same time, power consumption is continuously increasing, and consumers are becoming more complex, which ultimately requires new investments in the distribution network. Concept of smart grids is generally accepted as a possible solution. Smart grid is a concept with many elements, where monitoring and control of every element in the chain of production, transmission, distribution and final consumption enable much more efficient delivery and use of electricity. One of the elements of smart grid efficiency is the ability of real-time demand-supply balancing. This balancing is carried out by monitoring of consumption and redistribution of electricity among individual end users, according to their needs. The aim of this paper is creating algorithm for real-time load management using power measurements. Algorithm for real-time load management at the ETFOS (Faculty of Electrical Engineering in Osijek), Croatia is created based on measurements of photovoltaic power plant production, the power consumption of air conditioning system and the faculty building total electricity consumption. Expected result of real-time re-dispatching of air conditioners consumption, depending on the level of electricity production in photovoltaic power plant is decreasing peak demand of the faculty. 展开更多
关键词 Photovoltaic power plant smart grid load management air conditioning system power measurements.
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