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A Research of the String Inverter Grid-Connected Photovoltaic System Based on Intelligent cluster controller

A Research of the String Inverter Grid-Connected Photovoltai...

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第十五届国际光伏科学与工程大会

作者： Zhang Xing~1 Ni Hua~1 Yao Dan~1 Xu Po~1 Cao Ren-xian~2 1 School of Electrical and Automation Engineering Hefei University of Technology Hefei Anhui230009 P.R.China 2 Hefei Sunlight Power Supply Co.Ltd Hefei Anhui230088 P.R.China

＜正＞ Based on the design of intelligent cluster controllers, a high performance gird-connected photovoltaic power system of string inverters is developed in this *** system is consist of single phase gird-connected inverters, intelligent cluster controllers and friendly computer monitor software. With the optimal MPPT arithmetic by the forth-back voltage increment perturbation, the maximal power output of PV modules is realized. On the other hand, The cluster controller can monitor a maximum of 60 inverters in the locale of PV modules synchronously. The relevant verification has been carried using the experimental units, and the system possesses excellent capability of high efficiency, intelligent maintenance and integrated management.

关键词： photovoltaic grid-connected inverter cluster controller MPPT

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Introducing Low Cost Virtual Lab Environment for the University by Using Cloud Environment

Introducing Low Cost Virtual Lab Environment for the Univers...

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2012 4th International Conference on Computer Engineering and Technology(ICCET 2012)

作者： Thimira Darshana Upatissa Ajantha Atukorale University of Colombo School of Computing Sri Lanka

Cloud computing is a concept that comprises a lot of underlying technologies such as virtualization[1], utility computing and system oriented architecture. Eucalyptus is a Java based cloud management tool that consists with four major components: Cloud controller, cluster controller, Node controller and Walrus. The main objective of this research is to introduce a low cost virtual lab environment for an institute by keeping a consistent copy of Virtual Machine （VM） image when the multiple users access the same VM image. Basically there are lots of approaches which have been taken to improve the effectiveness of managing virtual machine images in Eucalyptus based Cloud environment. Here mainly we have been used two approaches to enhance the current virtual image sharing mechanism, without damaging the flow of the Cloud environment. In our approach we implemented a locking mechanism for the cloud controller which acts as the main control unit of the Cloud environment to keep the consistency and then we integrate the version enabling mechanism for the Walrus which acts as the main storage controller of the cloud environment. For the version enabling mechanism we used virtual machine images with Btrfs file system which contains the copy on write feature to keep the multiple copies of same VM image when required.

关键词： Virtualization Cloud Computing Cloud controller cluster controller Node controller Walrus Virtual Lab Eucalyptus

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