Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1997-04-07
1999-03-16
Riley, Shawn
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307105, 361 76, H02M 112
Patent
active
058837965
ABSTRACT:
A method and apparatus is provided for restoring a sagging voltage signal on a power transmission line, caused by a remote fault in the utility power system, to a balanced three-phase condition at the pre-fault voltage level. Voltage restoration is provided by injecting a voltage signal in series with the power transmission line which restores the load voltage vectors to the pre-fault condition. The restored load voltage vectors are rotated by a selected phase angle such that zero real power flow is associated with the voltage restoration. The voltage compensation signal may be injected into the power transmission line by connecting a voltage compensator inverter in series with the transmission line. The voltage compensator inverter may be controlled to provide the desired injected voltage signal using a synchronous reference frame based controller. The voltage restoration function may be achieved by controlling the inverter to generate an inverter voltage signal which restores the positive sequence load voltage component to pre-fault conditions, and which cancels negative and zero sequence components of the load voltage signal. Phase rotation to ensure the zero power flow condition is achieved by controlling the inverter to generate an inverter voltage signal which balances the voltage across a DC bus capacitor which powers the inverter. Uninterruptible power supply and active harmonic filtering functions may be provided by the system.
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Cheng Po-Tai
Divan Deepakraj M.
Lasseter Robert H.
Riley Shawn
Wisconsin Alumni Research Foundation
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