Hybrid distribution transformer with an integrated voltage source converter
First Claim
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1. A hybrid distribution transformer having a primary side for receiving input voltage and current from a source and a secondary side for providing output voltage and current to a load, the hybrid distribution transformer comprising:
- a ferromagnetic core;
a winding structure for a power phase, the winding structure comprising one or more first windings and one or more second windings wound around the core, wherein the one or more first windings are disposed on one of the primary side and the secondary side of the transformer and the one or more second windings are disposed on the other one of the primary side and the secondary side of the transformer; and
a single voltage source converter connected to the winding structure and operable to convert between DC and AC voltages, the voltage source converter comprising;
at least one switching bridge comprising two or more switching devices;
a DC bus connected in parallel with the at least one switching bridge; and
a controller operable to control the at least one switching bridge to control the power factor on the primary side of the hybrid distribution transformer and to reduce variations in the output voltage in the event of a change in the input voltage.
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Abstract
A hybrid distribution transformer is provided that includes an electromagnetic transformer and a voltage source converter that is operable to reduce fluctuation in the output voltage of the hybrid distribution transformer in the event of an increase or decrease in the input voltage.
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Citations
29 Claims
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1. A hybrid distribution transformer having a primary side for receiving input voltage and current from a source and a secondary side for providing output voltage and current to a load, the hybrid distribution transformer comprising:
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a ferromagnetic core; a winding structure for a power phase, the winding structure comprising one or more first windings and one or more second windings wound around the core, wherein the one or more first windings are disposed on one of the primary side and the secondary side of the transformer and the one or more second windings are disposed on the other one of the primary side and the secondary side of the transformer; and a single voltage source converter connected to the winding structure and operable to convert between DC and AC voltages, the voltage source converter comprising; at least one switching bridge comprising two or more switching devices; a DC bus connected in parallel with the at least one switching bridge; and a controller operable to control the at least one switching bridge to control the power factor on the primary side of the hybrid distribution transformer and to reduce variations in the output voltage in the event of a change in the input voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A hybrid distribution transformer having a primary side for receiving input voltage and current from a source and a secondary side for providing output voltage and current to a load, the hybrid distribution transformer comprising:
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a ferromagnetic core; first, second and third winding structures, each comprising first and second windings wound around the core, wherein one of the first and second windings is a primary winding for connection to the source and one of the first and second windings is a secondary winding for connection to the load; and a voltage source converter connected to the first windings and operable to convert between DC and AC voltages, the voltage source converter comprising; a plurality of switching bridges connected in parallel, each switching bridge comprising two or more switching devices; a DC bus connected in parallel with the switching bridges; and a controller operable to control the switching bridges to control the power factor on the primary side of the hybrid distribution transformer and to reduce variations in the output voltage in the event of a change in the input voltage; wherein each of the first windings has a plurality of turns and a tap connected to one of the turns; wherein nodes in first, second and third ones of the switching bridges are connected to the taps of the first windings, respectively; wherein nodes in fourth, fifth and sixth ones of the switching bridges are connected to ends of the first windings, respectively; wherein a node in a seventh one of the switching bridges is connected to a bushing adapted for connection to the voltage source or the load; and wherein in each of the switching bridges, the node is located between the switching devices. - View Dependent Claims (22)
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23. A hybrid distribution transformer having a primary side for receiving input voltages and currents from a source and a secondary side for providing output voltages and currents to a load, the hybrid distribution transformer comprising:
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(a.) a ferromagnetic core; (b.) three winding assemblies mounted to the core, each winding assembly comprising a first, second and third windings, one of the first and second windings being a primary winding for connection to the voltage source and the other one of the first and second windings being a secondary winding for connection to the load, the third winding being an auxiliary primary winding or an auxiliary secondary winding; (c.) a single integrated voltage source converter connected to the second and third windings of each of the winding assemblies, the converter comprising; a first bridge comprising first, second and third circuit legs connected in parallel, each of the first, second and third circuit legs comprising a pair of semiconductor switches connected in series, wherein nodes in the first, second and third circuit legs are connected to ends of the third windings, respectively, and wherein in each of the first, second and third circuit legs, the node is located between the semiconductor switches; and a second bridge comprising fourth, fifth and sixth circuit legs connected in parallel, each of the fourth, fifth and sixth circuit legs comprising a pair of semiconductor switches connected in series, wherein nodes in the fourth, fifth and sixth legs are connected to ends of the second windings, respectively, and wherein in each of the fourth, fifth and sixth circuit legs, the node is located between the semiconductor switches; a DC bus connected in parallel with the first and second bridges; and (d.) a controller operable to control the converter to control the power factor on the primary side of the hybrid distribution transformer and to reduce variations in the output voltages in the event of changes in the input voltage. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification