Iulia Dumitru

Increasing Energy Efficiency in Data Centers Using Energy Management

Data centers provide the global community withan indispensable service: nearly unlimited access to almost any kind of information we can imagine. With the increasing demand of information, the high energy costs has raised the issue of power consumption. The main goal in achieving data center energy efficiency can be translated into the ensuring that IT equipment uses, as maximum power as possible from the power entering the data center to compute useful work but at the same time the service level agreement between costumers and managers has to be satisfied. In this paper, different concepts of efficiency that are linked with multiple methods of increasing energy efficiency into a data center, will be presented, as well as different principles of energy management. A comprehensive overview of the currently available energy metrics will be provided, followed by an in-depth analysis of their commonalities and differences. An analyze about the degree of freedom encountered into the process of energy management, will be afforded. This paper presents a global overview of the energy efficiency management process into a data center.

Towards a global energy management within a data center

In our days, data centers provide the global community with an indispensable service: nearly unlimited access to almost any kind of information by supporting Internet services such as Web hosting or E-commerce services. With the increasing demand of information, data centers consume a great amount of energy. The resulting high utility costs is reason enough to address power consumption. In this paper a data center energy model is proffered along with an optimization energy management algorithm designed to increase the overall IT energy efficiency. The energy model and the optimization algorithm are taking into account a global overview of the data center (power distribution units, cooling system and the IT system). A power management algorithm is proposed and it is shown that it yiels good energy gain in comparison with the known scheduling algorithms.

Distributed Generation Influence on Smart Distribution Grids

Abstract This paper presents a methodology for choosing the best location of a distributed generation (DG) unit in a distribution grid considering the short-circuit current values. The optimum position into the grid is searched according to the minimum short circuit current. A three bus network was used in order to test the methodology and a real distribution network in Romania was proposed.

Load frequency regulation in power systems

This paper focuses on load frequency regulation, as a major function of automatic generation control (AGC) in the context of a versatile power system structure, environmental constrains and emerging new uncertainties. Generation units models are determined in order to build a control diagram used for load dispatch. The optimal parameters for the secondary controller were determined using a gradient descent algorithm.

Process Control Simulator using programmable controller technology

The simulation of physical processes represents a modern and efficient direction for multifunctional testing platforms. This paper will present a Process Control Simulator and its applications in system simulation. The Process Control Simulator can be used for students training as well as for the conception, simulation and improvement of control schemes in modern technologies. The simulation of industrial processes reduces the cost and the amount of time needed for deploying the system. The various types of applications, with different complexity factors, are associated with several functional masks. The Process Control Simulator uses a simulation block and a microcontroller for all the applications with different replaceable masks according to the desired application.

Energy Efficiency Dependency Analysis for a Data Center

Data centers energy efficiency has become an issue given the rising of energy prices and the increase of Web applications, which are hosted, mainly in data centers. In order to understand the opportunities for improving data center energy efficiency, it is necessary to determinate the real energy requirements for one computer application. This article will examine the power chain starting from the facility level and ending at the processor level. In this paper a data center energy model is proffered along with two important indicators that address energy efficiency: the first one is addressing Facility Efficiency and the second one is addressing IT Efficiency. The energy model is taking into account a global overview of the data center (power distribution units, cooling system and the IT system). The aim of the research is to find effective solutions to make data center reduce power consumption while keeping the desired quality of service or service level agreement.

A fuzzy PLC control system for a servomechanism

Abstract This paper presents a case study on a practical implementation of a fuzzy-PLC system for a servomechanism. The method presented achieves smooth fuzzy control, that can be easily implemented in a PLC system. The speed of the servomechanism is controlled.

Process Control Simulator for Components of a Complex Power System

Abstract The simulation and the optimisation of some industrial processes represents a modern and efficient direction for multifunctional testing platforms. These platforms are designed for complex developments of technologic scenarios in order to improve and implement the control schemes with the help of modern technologies. The cost and the amount of time needed for deploying the system are reduced with the simulation of the process. The process control simulator presented in this paper is used for design and test control diagrams of the complex power plant processes. The entire process of a power plant is divided into hierarchical subsystems which are simulated separately. With the help of the process control simulator the different types of processes are simulated and can be optimisated. For each process a functional masks is associated, corresponding to different types of applications and with different complexity factors. The goal is to develop algorithms for practical work in different areas and implement them into the programmable logical controller (PLC) unit. A simulation block is used for all the applications having different replaceable masks according to the desired application as well as a PLC program simulator.