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 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 is connected to the first winding and is operable to convert between DC and AC voltages, the voltage source converter comprises;
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.
78 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 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 is connected to the first winding and is operable to convert between DC and AC voltages, the voltage source converter comprises; 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, 21, 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 voltage source converter connected to the second and third windings, 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