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The task of additional reactive power compensation (also known as voltage compensation) is assigned to compensating devices: [7] passive (either permanently connected or switched) sinks of reactive power (e.g., shunt reactors that are similar to transformers in construction, with a single winding and iron core [9]).
Heavily loaded lines consumed reactive power due to the line's inductance, and as transmission voltage increased throughout the 20th century, the higher voltage supplied capacitive reactive power. As operating a transmission line only at it surge impedance loading (SIL) was not feasible, [2] other means to manage the reactive power was needed.
In an electric power transmission system, a thyristor-controlled reactor (TCR) is a reactance connected in series with a bidirectional thyristor valve. The thyristor valve is phase-controlled, which allows the value of delivered reactive power to be adjusted to meet varying system conditions.
These services include reactive power compensation, voltage regulation, flicker control, active power filtering and harmonic cancellation. [6] Wind turbines with variable-speed generators have the potential to add synthetic inertia to the grid and assist in frequency control.
In addition to power flow control and stability enhancement, the SSSC can also be used to improve voltage profile and mitigate voltage fluctuations. By injecting reactive power, the SSSC can regulate the voltage levels at various points in the power system, ensuring that they remain within acceptable limits.
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