초록 ▼

Apparatus for injection voltage compensation in series into an electric power line includes an inverter or other controlled voltage source which wye connects the secondary windings of a three-phase transformer to the load end of the electric power line. The transformer, which could already be presen

Apparatus for injection voltage compensation in series into an electric power line includes an inverter or other controlled voltage source which wye connects the secondary windings of a three-phase transformer to the load end of the electric power line. The transformer, which could already be present for meeting load requirements, has its primary winding connected to the source end of the electric power line and sustains the saturation currents rather than the inverter in response to faults on the source side of the transformer. Preferably, a three-phase inverter with a common dc link is used. For active power line conditioner (APLC) action, a second, also preferably a three-phase, inverter is connected in parallel to the load end of the electric power line and to the common dc link. This parallel inverter provides harmonic and reactive power compensation and also supplies the real power requirements of the wye connection inverter.

대표청구항 ▼

[ What is claimed is:] [1.] Apparatus for providing compensation in a three-phase electric power line between a source end and a load end, said apparatus comprising:three-phase transformer means connected in said three-phase power line between said source end and said load end and having three prima

[ What is claimed is:] [1.] Apparatus for providing compensation in a three-phase electric power line between a source end and a load end, said apparatus comprising:three-phase transformer means connected in said three-phase power line between said source end and said load end and having three primary windings connected to said source end of said three-phase electric power line and having three secondary phase windings; andinverter means wye connected in series with said three secondary phase windings of said transformer means to said load end of said electric power line.