This doctoral thesis presents the development of sensorless methods aiming the rotor speed control of asymmetrical two-phase induction motors. Initially, the machine mathematical model is presented. From the machine model, ...

Sustainability is becoming a major driving force in energy policy, leading to the development of different strategies and projects. Many of these strategies are related to the application of novel methodologies for selecting ...

This Ph.D. Thesis proposes a comparison of modulation techniques, semiconductors devices technologies and topologies for multilevel inverters, in order to point out the multilevel drive system that presents the best ...

This thesis proposes to improve the efficiency of public illumination systems by means of AC chopper based power converters. A comparative study of high performance AC/AC converters feeding high pressure sodium lamps on ...

This works presents a Robust Variable Structure Model Reference Adaptive Control scheme denoted VS RMRAC. In this adaptive control strategy, each parameter of the control law is obtained by the sum of two other adaptive ...

Wireless sensor and actuator networks are expected to grow quickly in size due to the decreasing cost of nodes. For such large scale networks, the geographic routing algorithm is a suitable approach. It finds a route for ...

The Doubly Fed Induction Generator (DFIG) is one of the most frequently deployed large grid connected Wind Turbines (WT) concept. The implementation of classical vector control techniques, have been proven to work well for ...

A key feature of family livestock of the Alto Camaquã is its dependence on the natural resources, including springs for watering animals and domestic supply. However, this territory requires water management strategies, ...

The issue involving the proper management of municipal solid waste is still a serious problem that affects mainly developing countries, just as Brazil. Only in 2010, with the implementation of the National Solid Waste ...

The monitoring of flood events provide the study of the flow generated during the rains, as well as the production and sediment transport in rural and urban watersheds providing monitoring data for future applications. The ...