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This paper deals with the power flow analysis and control strategy research of unified power quality conditioner (UPQC). A UPQC is a combination of shunt and series active power filter (APF), sharing a common dc link. It can compensate almost all power quality problems such as voltage harmonics, voltage unbalance, voltage flickers, voltage sags, voltage swells, current harmonics, current unbalance,...
This paper presents detailed analysis to compare and evaluate the performances of four control strategies for extracting the reference currents of shunt active power filter under distorted and unbalanced source and load conditions. The four controllers are based on instantaneous reactive power (p-q), d-q coordinate formulation (d-q), unity power factor (UPF), and perfect harmonic cancellation (PHC)...
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