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Distributed Strategy for Power Re-Allocation in High Performance Applications
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作者 Vaibhav Sundriyal Masha Sosonkina 《Journal of Computer and Communications》 2020年第12期142-158,共17页
To improve the power consumption of parallel applications at the runtime, modern processors provide frequency scaling and power limiting capabilities. In this work, a runtime strategy is proposed to distribute a given... To improve the power consumption of parallel applications at the runtime, modern processors provide frequency scaling and power limiting capabilities. In this work, a runtime strategy is proposed to distribute a given power allocation among the cluster nodes assigned to the application while balancing their performance change. The strategy operates in a timeslice-based manner to estimate the current application performance and power usage per node followed by power redistribution across the nodes. Experiments, performed on four nodes (112 cores) of a modern computing platform interconnected with Infiniband showed that even a significant power budget reduction of 20% may result in a performance degradation of as low as 1% under the proposed strategy compared with the execution in the unlimited power case. 展开更多
关键词 Multinode power Allocation RAPL UFS DVFS Maximizing Performance component power
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A novel control scheme for simultaneous elimination of imbalance, disturbance and voltage harmonic in power systems
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作者 Javad Olamaei Farnoosh NarjabadiFam Amid Nazeri 《Journal of Central South University》 SCIE EI CAS 2014年第4期1368-1375,共8页
In recent years, the increasing application of nonlinear and unbalanced electronic equipment and large single phase loads have made voltage imbalance a serious problem in power distribution systems. A novel approach h... In recent years, the increasing application of nonlinear and unbalanced electronic equipment and large single phase loads have made voltage imbalance a serious problem in power distribution systems. A novel approach has been proposed to eliminate voltage imbalance and disturbances. The main strategy of this scheme is based on series active filter. By improving control circuit toward existing schemes and proposing a new strategy to control the voltage amplitude, simultaneous elimination of voltage imbalance, faults, voltage harmonics and also compensation of voltage drop in transmission lines become possible. Eventually, the voltage on the load side is a perfectly balanced three phase voltage with specific proper amplitude. The proposed scheme has been simulated in a test network and the results show high capability of this scheme for the complete elimination of imbalance without phase shift. 展开更多
关键词 power quality series active filter voltage imbalance voltage harmonic symmetrical components
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AT供电系统的部分感应电压系数 被引量:4
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作者 辛成山 唐灵芝 《铁道学报》 EI CAS CSCD 北大核心 1999年第6期38-41,共4页
提出AT供电系统的部分感应电压系数概念,给出其推导过程,结合计算实例,就这一概念的工程应用进行了讨论。部分感应电压系数概念可鲜明揭示出AT漏抗。
关键词 AT供电系统 电气化铁路 通信干扰 感应电压系数
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Corona noise model of high-voltage AC transmission lines and engineering applications
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作者 Wu Jiuhui Di Zelong 《Engineering Sciences》 EI 2013年第1期68-73,共6页
In order to predict the levels of corona noise from high-voltage alternating current (AC) transmission lines, the mechanism of corona noise and the corresponding theoretical prediction model are investigated. On the... In order to predict the levels of corona noise from high-voltage alternating current (AC) transmission lines, the mechanism of corona noise and the corresponding theoretical prediction model are investigated. On the basis of Drnde model, the motion of positive and negative ions produced by high-voltage corona is analyzed, and the mechanism of corona noise is discovered. The theoretical prediction model is put forward by using Kirchhoff formula, which is verified by the well agreement between our result and others' , considering the case of three- phase single lines. Moreover, the calculation results show that for both single and bundled lines, the sound pres- sure level of the typical frequency, i.e. twice the power frequency, attenuates slowly and leads to an obviously in- terferential phenomenon near the transmission lines, but the level of the bundled lines is smaller than that of the single ones under the same transmission voltage. Based on the mechanism of corona noise and the prediction model, it is obvious that bundled lines and/or increased line radius can be adopted to reduce corona noise in the practical engineering applications effectively. This model can also provide a theoretical guidance for the high-volt- age AC transmission line design. 展开更多
关键词 corona noise Drude model twice power frequency component Kirchhoff formula noise reduction
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Scaling diode-pumped, high energy picosecond lasers to kilowatt average powers 被引量:2
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作者 Brendan A.Reagan Cory Baumgarten +8 位作者 Elzbieta Jankowska Han Chi Herman Bravo Kristian Dehne Michael Pedicone Liang Yin Hanchen Wang Carmen S.Menoni Jorge J.Rocca 《High Power Laser Science and Engineering》 SCIE CAS CSCD 2018年第1期67-75,共9页
Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz re... Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz repetition rate(0.75 kW average power) are reviewed. These pulses are compressed resulting in the generation of ~5 ps duration,1 J pulses with 0.5 kW average power. A full characterization of this high power cryogenic amplifier, including atwavelength interferometry of the active region under >1 kW average power pump conditions, is presented. An initial demonstration of operation at 1 kW average power(1 J, 1 k Hz) is reported. 展开更多
关键词 advanced laser technology and applications diode-pumped solid-state laser and applications high power laser high power laser related laser components laser amplifiers
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