Series compensator inserting real and reactive impedance into electric power system for damping power oscillations
Patent 5642007 Issued on June 24, 1997. Estimated Expiration Date: 
December 30, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 30, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPhase-shifting transformer system Transmission line dynamic impedance compensation system Vernier control system for subsynchronous resonance mitigation Apparatus and method for dynamic voltage restoration of utility distribution networks Generalized fast, power flow controller Controlled electrical energy storage apparatus for utility grids Patent #: 5369353 InventorsAssigneeApplicationNo. 366646 filed on 12/30/1994US Classes:307/102, STABILIZED, ANTI-HUNTING OR ANTIOSCILLATION SYSTEMS323/207Using converterExaminersPrimary: Elms, RichardAttorney, Agent or FirmForeign Patent References
International ClassesH02J 003/24G05F 001/70 AbstractA series compensator for damping power oscillations in an electric power transmission system includes a switching power converter which injects a voltage into the transmission line having a phase angle relative to transmission line current which is controlled to provide reactive compensation and to inject virtual real impedance into the line. The switching power converter is a dc to ac converter which is capable of injecting virtual real impedance into the transmission line by virtue of the fact that it has a power exchange device connected to its dc terminals. Where the power exchange device is a resistor, the switching power converter is capable of absorbing real power during surges in power on the line. Alternatively, the power exchange device is a storage device such as a battery bank or a super conducting magnet, in which case the switching power converter can provide both virtual positive and negative real impedance.Other References
Field of SearchSTABILIZED, ANTI-HUNTING OR ANTIOSCILLATION SYSTEMSWITH LINE DROP COMPENSATION With intervening converter Storage battery or accumulator-type source Sources distributed along load circuit Using converter Using impedance Switched impedance Superconductive (e.g., cryogenic, etc.) With compensation Superconductive (e.g., cryogenic, etc.) device | |
