Controle de corrente e estimação de posição em máquinas assíncronas.

Abstract

This paper presents a study of the main current control techniques for drives. electrical with three-phase induction machines. This study reveals that the techniques best overall dynamic performance (response time, referendum tracking and rejection require prior and accurate knowledge of machine parameters to tune the controller gains. In this sense, a strategy is proposed that automatically tune gains from current require prior and accurate knowledge of machine parameters. The strategy developed suitable for tuning proportional-integral current controllers and proportional-integral-derivative, requires knowledge of the machine's frequency response null velocity is based on the principle of conformation of the mesh gain. THE frequency response of the machine and obtained through a single identification experiment which does not require any special instrumentation other than that usually and available on a typical electric drive. The signals used in the identification experiment allow you to keep the machine at zero speed without any mechanical apparatus special and guarantee excitation over a wide frequency range. This work also presents a study of the main estimation techniques of magnetic flux, velocity and mechanical position for three-phase induction machines. Special attention is given to speed and position estimation techniques that can be used with the machine independent of precise knowledge of machine parameters. In this In this sense, a position estimation technique that employs high frequency signals is proposed. and uses a serial decomposition of wavelets for filtering and reducing the ratio signal to noise.