Discussion
Which FACT (Flexible AC Transmission) device is the best choice to increase the power transfer capability, for the same level of compensation?
Answer: B
The power transferred through a line is \(P = \dfrac{V_1V_2}{X}\sin\delta\), and for the same level of compensation a series compensator, a capacitor in series with the line, reduces the effective reactance \(X\) directly and so raises the power limit most effectively. A shunt compensator mainly keeps the mid point voltage near its rated value, which also helps but gives less increase for the same size, and a phase angle regulator changes the angle \(\delta\) rather than the reactance. A voltage source inverter is a building block, not a compensator type. The answer is the series compensator, option B.
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