Modeling and controlling of unified power quality compensator

With the wide application of nonlinear and electronically switched devices in distribution systems, the power quality problem becomes more serious. This paper proposes a new advanced custom power device-unified power quality compensator (UPQC); deduces its mathematical model based on switching function and analyzes the control principle of such UPQC. The validity of the model as well as the control principle of UPQC are verified by the results of computer simulation.