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For modern parallel applications, modeling their general execution characteristics, such as power and time, is difficult due to a great many factors affecting software-hardware interactions, which is also exacerbated by the dearth of measuring and monitoring tools for novel architectures, such as Intel Xeon Phi processors. To address this modeling challenge, the present work proposes to employ the...
We present a semi-empirical model for analyzing where a program spends its energy. This model combines measured features of an application, such as its instruction mix, with measured costs of the platform, such as the energy per operation specialized to different operations. The model permits costs to vary with voltage and frequency, as they would on platforms that support dynamic voltage and frequency...
Optimizing processors for (a) specific application(s) can substantially improve energy-efficiency. With the end of Dennard scaling, and the corresponding reduction in energy-efficiency gains from technology scaling, such approaches may become increasingly important. However, designing application-specific processors requires fast design space exploration tools to optimize for the targeted application(s)...
This paper deals with power quality increasing problem in power supply systems of industrial enterprises with intensive spread of nonlinear load, including machine-building enterprises. The usage of shunt active filter as a kind of active correction system for power quality increasing is presented in the paper. The proposed algorithm of harmonic determination and elimination for shunt active filter...
The use of performance counters (PCs) to develop per-core power proxies for multicore processors is now well established. These proxies are typically obtained using traditional linear regression techniques. These techniques have the disadvantage of requiring the full PC set regardless of the workload run by the multicore processor. Typically a computationally expensive principal component analysis...
The presented paper deals with simulation of a detailed model of wind conversion chain based on permanent synchronous machine. In this paper, wind energy is transformed to a mechanical energy by blade and turbine and turbine, which is transmitted to the shaft of the PMSM, that's was modeled then simuled with MATLAB. Also the out put voltage of this wind conversion chain is controlled by a PI regulator...
This paper present a detailed model of wind conversion chain based on a PMSM oriented to the simulation. Wind model is presented both variable and constant case with that blade and turbine. The latter consists of the conversion of wind energy into mechanical energy which is transmitted to the shaft of the PMSM, which was modeled then simuled with Matlab Simulink. Also the control of PMSM output voltage...
A new simulation program “PV TESTER” has been developed to study the sensitivity of predicted AC Energy yield and kWh/kWp to PV module performance parameter changes, uncertainties or variabilities. This paper studies four PV technologies at 12 weather sites worldwide with 13 different input changes. PV Tester allows quantitative estimates of the yield improvement to be made with respect to site parameters...
The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated...
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