Transmission line dynamic impedance compensation system
First Claim
1. A transmission line impedance compensation system for dynamically balancing a phase-quadrature or reactive voltage component on the transmission line responsive to demand, said system comprising:
- compensating means coupled in series with the transmission line and being adapted to introduce or inject a phase-quadrature voltage component, ancillary to the transmission line reactive voltage component for a predetermined operating frequency;
control means for adjusting said compensating means to stabilize the magnitude and phase of a resultant phase-quadrature voltage for the injected voltage component with the transmission line reactive voltage component, substantially in phase quadrature leading or lagging phase angles with respect to transmission line voltage and current parameters,said compensated transmission line having a corresponding adjustment for the real power (P) and reactive power (Q) components in order to provide transient and dynamic stability without incurring subsynchronous resonance.
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Accused Products
Abstract
A series impedance compensation system for a set of transmission lines which are used for electrical power transmission, with these parallel lines being protected from the transient faults and dynamic subsynchronous oscillation problems. These problems can become aggravated by the introduction of capacitor banks which thus serve as only a partial solution to the disturbances of transient faults during conventional recovery modes of operation. The impedance compensation system is coupled in series to each transmission line to dynamically balance the inductor impedance on the transmission line, responsive to demand, by injecting a voltage component determined to be optimized substantially at quadrature leading or lagging phase angles (±90°) with respect to the transmission line voltage and current components. The impedance compensation system includes a circuit based solid-state switching power converter with self-commutating thyristor or GTO semiconductor switches connected in a parallel shunting arrangement with reverse poled or freewheeling diodes. This is done in order to provide either an absorptive component or a generated component of output pole voltage carrying a 90° segment of the output current in each cycle, as this provides dynamic stability without fostering subsynchronous resonance.
217 Citations
16 Claims
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1. A transmission line impedance compensation system for dynamically balancing a phase-quadrature or reactive voltage component on the transmission line responsive to demand, said system comprising:
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compensating means coupled in series with the transmission line and being adapted to introduce or inject a phase-quadrature voltage component, ancillary to the transmission line reactive voltage component for a predetermined operating frequency; control means for adjusting said compensating means to stabilize the magnitude and phase of a resultant phase-quadrature voltage for the injected voltage component with the transmission line reactive voltage component, substantially in phase quadrature leading or lagging phase angles with respect to transmission line voltage and current parameters, said compensated transmission line having a corresponding adjustment for the real power (P) and reactive power (Q) components in order to provide transient and dynamic stability without incurring subsynchronous resonance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification