Voltage or impedance-injection method using transformers with multiple secondary windings for dynamic power flow control
First Claim
1. A system for dynamic line balancing in a high voltage electric power grid comprising:
- a plurality of impedance-injection modules distributed along a transmission line of the high voltage electric power grid;
each impedance-injection module having;
a transformer having a transformer core with a plurality of secondary windings thereon;
a plurality of power-electronic circuits for generation and injection of the inductive and capacitive impedances, each power-electronic circuit being coupled to a respective secondary winding;
the transformer and the plurality of power-electronic circuits being enclosed in a single housing and with the 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.
158 Citations
20 Claims
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1. A system for dynamic line balancing in a high voltage electric power grid comprising:
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a plurality of impedance-injection modules distributed along a transmission line of the high voltage electric power grid; each impedance-injection module having; a transformer having a transformer core with a plurality of secondary windings thereon; a plurality of power-electronic circuits for generation and injection of the inductive and capacitive impedances, each power-electronic circuit being coupled to a respective secondary winding; the transformer and the plurality of power-electronic circuits being enclosed in a single housing and with the 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, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of providing dynamic and distributed line balancing of a high-voltage transmission line by active impedance-injection modules, the method comprising:
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providing active impedance-injection modules for dynamic line balancing of a high-voltage transmission line, each active impedance-injection 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 active impedance-injection module is at the potential of the high voltage transmission line to which it is coupled; a plurality of power-electronic circuits, each of the power electronic circuits coupled to each secondary winding; the transformer and the power-electronic circuits being packaged in a single housing as an active impedance-injection 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 of the distributed active impedance-injection modules by the transmission line, by insulators on a respective high-voltage transmission line support tower, or by insulators on one or more special support structures. - View Dependent Claims (18, 19, 20)
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Specification