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What does a series FACTS controller inject to handle reactive power in a transmission system?

What does a series FACTS controller inject to handle reactive power in a transmission system? Correct Answer Voltage at 90°

A series FACTS controller injects voltage at an angle of 90° with respect to the line current, to handle reactive power in a transmission system. To lever real power in a transmission system, a series FACTS controller requires any angle other than quadrature (90°) relationship between its injected voltage and the line current.

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In FACTS technology, the controller employed in the transmission system is always a single high-power Controller.
To handle real power in a transmission system, a shunt FACTS controller requires quadrature relationship between its current and the line voltage.
Without proper reactive shunt compensation techniques, an increase in real power transmission will certainly result in an increase of reactive power demand at the end-voltage generators.
A transmission network can incorporate the connection of a combined series-series FACTS controller to it for its stability of power flow.
What kind of power does a unified series-series FACTS controller transfer via the dc power link?