Contribuições às análises da propagação das flutuações de tensão sob o enfoque do fenômeno Flicker

Abstract

Amongst a variety of Power Quality indicators, emerges the well known voltage fluctuation caused by large variable loads. This phenomenon is characterised by a low frequency envelop upon the 60 Hz voltage. This mainly affects the luminous flux produced by lamps and arises the flicker effect. Many papers have dealt with this subject and the propagation of voltage fluctuation along electrical power systems. Power supply companies, investigation centres and power regulator organisations are concerned about this matter as the effect can cause harm to distant illumination systems. As a result of this investigation, it has been concluded that the propagation may produce either voltage fluctuation amplification or attenuation. The short Circuit levei, components resistance, transformer connection and saturation levei and motor loads have been pointed out as reasons for the above. In this way, this dissertation contributes towards the investigation of the refereed factors on the attenuation/amplifícation of the flicker phenomenon. To reach the above targets, this dissertation uses computational studies utilising a platform known as SABER simulator. In order to provide means of modelling the variable load, a special template was developed and many practical cases were performed to achieve a better understanding of de overall behaviour