A Static Synchronous Compensator for Displacement Power Factor Correction under Distorted Mains Voltage Conditions

摘要

The improvement of electrical energy transmission efficiency has long been realized using passive power factor compensators containing shunt capacitors. Shunt capacitors are relatively inexpensive to install and maintain. Installing shunt capacitors in the load area or at the point where compensation is necessary increases the voltage stability. However, shunt capacitors have the problem of poor dynamics, poor voltage regulation and, beyond a certain level of compensation, a stable operating point is unattainable. Furthermore, the reactive power delivered by the shunt capacitor is proportional to the square of the terminal voltage; during low voltage conditions reactive power support drops, thus compounding the problem [1]. In addition, shunt capacitor compensators may suffer from resonances with distributed inductances of the utility grid.