Voltage or impedance-injection method using transformers with multiple secondary windings for dynamic power flow control
First Claim
1. An active impedance-injection module for distributed dynamic line balancing of a high-voltage transmission line comprising:
- a transformer having a transformer core, the transformer core having a plurality of secondary windings thereon;
a plurality of converters, each coupled to a respective secondary winding; and
a controller coupled to each converter;
the transformer, the converters and the controller all being packaged in a single housing for use with a high-voltage transmission line passing through the transformer core, thereby forming a transformer with a single-turn primary and the plurality of secondary windings.
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Abstract
This patent discloses an active impedance-injection module for dynamic line balancing of a high-voltage (HV) transmission line. The impedance-injection module comprises a plurality of transformers each having a primary winding in series with a HV transmission line. Each transformer also has secondary windings, each connected to an individual electronic converter. The plurality of secondary windings are electrically isolated from the associated primary winding and extract power from the HV transmission line for operation of the converters and other circuits connected to the secondary windings. The active impedance-injection module is enabled to generate a controlled impedance, inductive or capacitive, to be impressed on the HV transmission line. A plurality of active impedance-injection modules spatially distributed on a HV transmission line are enabled to inject a controlled cumulative impedance on a HV transmission line while limiting the capacity of individual converters to that achievable with practical electronic components.
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Citations
25 Claims
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1. An active impedance-injection module for distributed dynamic line balancing of a high-voltage transmission line comprising:
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a transformer having a transformer core, the transformer core having a plurality of secondary windings thereon; a plurality of converters, each coupled to a respective secondary winding; and a controller coupled to each converter; the transformer, the converters and the controller all being packaged in a single housing for use with a high-voltage transmission line passing through the transformer core, thereby forming a transformer with a single-turn primary and the plurality of secondary windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. For use in an active impedance-injection module for dynamic line balancing of a high-voltage transmission line, an improvement comprising:
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a transformer having a transformer core, the transformer core having a plurality of secondary windings thereon; a plurality of converters, each coupled to a respective secondary winding; and a controller coupled to each converter; the transformer core being a split core, whereby the split core is assembled around a high-voltage transmission line in place; wherein the active impedance injection module itself is at the potential of the high voltage transmission line. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of providing dynamic and distributed line balancing of a high-voltage transmission line comprising:
providing at least one active impedance-injection module for dynamic line balancing of a high-voltage transmission line, each module having; at least one transformer having a split transformer core, enabled for distributed installations over the high voltage transmission line, each transformer core having a plurality of secondary windings thereon, whereby the split core can be assembled around a high-voltage transmission line in place and the impedance injection module is at the potential of the high voltage transmission line to which it is coupled; a plurality of converters, each coupled to a respective secondary winding; and a controller coupled to each converter; the transformer, the converters and the controller all being packaged in a single housing as a module for use with a high-voltage transmission line passing through the transformer core, thereby forming a transformer with a single-turn primary, and the plurality of secondary windings; and supporting each module by the transmission lines, directly supporting each module from insulators on a respective high-voltage transmission line support tower or using a respective special support structure. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
Specification