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Two cases are considered: harmonic reduction and unbalanced load correction. The paper presents the method of reference signal detection for shunt active power filter control. The parallel filter used for the voltage shape improving in three-phase four wire systems is considered. The signal is detected from voltage harmonics. The method uses the state observer acting in frequency domain. The process...
The present work discuss the localization and coordinated operation of active power filters installed in a distribution power network. The localization problem is solved off-line for a given load variation scenario. The control of the current injected by the active power filter is solved on-line. In both cases the design solutions aim at reducing the total harmonic distortion below 5% and individual...
This paper describes an electric power quality monitor developed at the University of Minho. The hardware of the monitor is constituted by four current sensors based on Rogowski effect, four voltage sensors based on Hall effect, a signal conditioning board and a computer. The software of the monitor consists of several applications, and it is based on LabVIEW. The developed applications allow the...
A control algorithm is proposed for a three-phase hybrid power filter constituted by a series active filter and a shunt passive filter. The control strategy is based on the dual formulation of the vectorial theory of electrical power, so that the voltage waveform injected by the active filter is able to compensate the reactive power, to eliminate harmonics of the load current and to balance asymmetrical...
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