Power inverter apparatus using a transformer with its primary winding connected the source end and a secondary winding connected to the load end of an AC power line to insert series compensation
First Claim
1. Apparatus for providing compensation in an ac power line between a source end and a load end, said apparatus comprising:
- transformer means having primary winding means connected to said source end of said ac power line, and secondary winding means connected to said load end of said ac power line; and
inverter means connected to said primary winding means for providing series voltage compensation to said ac power line.
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Accused Products
Abstract
Series voltage compensation is provided in an ac power line by connecting the inverter unit of a dynamic voltage restorer (DVR) in series with the primary winding of a load transformer, which may already be present, thereby eliminating the need for injection transformers. For three-phase ac power lines the three primary phase windings can be either wye or delta connected. If they are wye connected, a three-phase inverter with a common dc source is preferred. For delta connected primary phase windings, separate single-phase inverters each with its own floating dc source can be directly connected in series with each primary phase winding. Preferably however, the poles of a two-phase inverter are direct connected in series between two of the primary phase windings and a common source phase, and share a common dc source referenced to the common source phase. While a single-phase inverter with its isolated dc source can be used for the third delta connected primary phase winding, it is further preferred that this single-phase inverter share the common dc source used by the two-phase inverter. In that case, one injection transformer is needed to isolate the compensation voltage inserted by this single-phase inverter in series with the third delta connected primary winding. Similar DVR arrangements can be used to provide series voltage compensation on the load side of a transformer with a delta connected secondary winding.
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Citations
19 Claims
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1. Apparatus for providing compensation in an ac power line between a source end and a load end, said apparatus comprising:
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transformer means having primary winding means connected to said source end of said ac power line, and secondary winding means connected to said load end of said ac power line; and inverter means connected to said primary winding means for providing series voltage compensation to said ac power line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for providing compensation in a three-phase ac power line having a source end and a load end, said apparatus comprising:
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three-phase transformer means having three primary phase windings connected to said source end of said three-phase ac power line, and three secondary phase windings delta connected to said load end of said three-phase ac power line; and inverter means connected to provide a compensating voltage in series with each of said three delta connected secondary phase windings of said three-phase transformer. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification