The bluetooth technology encompasses a simple low-cost, low-power, global radio system for integration into mobile devices to solve a simple problem: replace the cables used on mobile devices with radio frequency waves. Such devices can form a quick ad-hoc secure "piconet" and communicate among the connected devices. While WLANs had good ad-hoc networking capabilities, there was no clear market standard among them. Moreover, there were no global standards that can be integrated and implemented into small handheld devices. Some market analysts predict that there will be some 1.4 billion Bluetooth devices in operation by the year 2005 [1]. That is the reason we replace the cable from the "Network Adapter" with a low-cost RF link that we now call Bluetooth. However, the current specification1.1 [2][3] does not describe the algorithms or mechanisms to create a scatternet due to a variety of unsolved issues. Since the upper layers are not defined in Bluetooth, it is not possible to implement scatternet in current specification. Hence in this research, we need make some modifications to Bluetooth protocol in order to support the transmissions of packets in scatternet. In this paper we describe a novel scatternet architecture, and present link performance results of the proposed architecture.

Submitted by Irene Nascimento (irene.kessia@ufpe.br) on 2017-01-27T17:17:31Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertacao_Erika_1.pdf: 4090096 bytes, checksum: aad3d3481e2a810cc8765c9bade0883b (MD5) / Made available in DSpace on 2017-01-27T17:17:31Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertacao_Erika_1.pdf: 4090096 bytes, checksum: aad3d3481e2a810cc8765c9bade0883b (MD5) Previous issue date: 2016-07-29 / FACEPE / Microrrede é um conjunto de geração distribuída e sistemas de armazenamento de energia que abastece a demanda de um grupo de consumidores. A existência de um controle local independente da rede elétrica define uma microrrede, a qual pode se conectar ao sistema tradicional de potência ou desconectar-se e funcionar de forma autônoma a depender das condições físicas e/ou econômicas. O presente trabalho apresenta dois métodos de controle para o paralelismo de inversores em microrredes, o controle por inclinação e o controle mestre-escravo, com o objetivo de realizar um estudo comparativo. Primeiramente, são mostrados os conceitos de geração distribuída, microrredes e paralelismo de inversores. Depois, são apresentados os fundamentos teóricos e as principais características dos controles por inclinação e mestre-escravo. Por fim, é feita uma comparação entre as duas técnicas de controle para que permita definir qual é a melhor. Esta comparação é feita por meio de simulações de uma microrrede, analisando o seu desempenho nas situações conectada à rede elétrica principal, em ilhamento e durante o transitório de desconexão. Também é observado o comportamento de grandezas como corrente, amplitude e frequência da tensão e ainda o compartilhamento de carga entre os inversores. / Microgrid is a set of distributed generation and energy storage systems that supplies the demand of a group of consumers . The existence of a local control, independently of the main grid, defines a microgrid, which can be connected to or disconnected from the traditional power system working autonomously depending on the physical or economic conditions. This work presents two control methods for paralleling inverters in microgrids, droop control and masterslave control, in order to conduct a comparative study between both control techniques. Firstly, the concepts of distributed generation, microgrid and paralleled inverters are shown. Then, it is presented the theoretical fundamentals and main features of droop control and master-slave control. Finally, a comparison is done between both control techniques to allow define the best control technique. This comparison is done by means of simulations of a microrrede, analyzing its performance in the situations connected to the main grid, in islanding and during the disconnection transient. Also, it is observed the quantities behavior such as the current, the voltage amplitude and frequency and also the power shared among the inverters.