This study investigates the rotor speed estimation problem for induction motor drives. The authors propose the design of a scheme based on a discrete-time sliding mode observer which provides the rotor speed estimative. A new algorithm for discrete-time rotor speed estimation is developed and analysed. The conditions for the existence of a discrete-time sliding switching hyperplane are analysed. Moreover, conventional algorithms aiming at the chattering reduction and high-frequency switching on discrete-time implementation are discussed for use with the proposed technique. The stability analysis and parameter convergence of the proposed method are investigated for discrete-time solution. The algorithms developed are tested by experimental results based on fixed-point digital signal processor (DSP) platform (TMS320F2812). Therefore the results demonstrate the good performance of the proposed scheme.
Com a redução dos custos de investimento no Brasil, é crescente o número de unidades consumidoras que têm adotado os sistemas de micro e minigeração distribuídas de energia, em especial a geração fotovoltaica. Neste estudo, propõe-se uma metodologia de dimensionamento, orçamento e análise econômica para a instalação de um sistema fotovoltaico, aplicando-o ao estudo de caso de um consumidor do grupo A. Foi confeccionada uma planilha em Excel para se automatizar os cálculos, o que torna o modelo facilmente aplicável a outros estudos de caso. Observa-se, que para o caso em análise, a implementação do sistema de geração de energia é economicamente viável.
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