What is the role of reactive power in a power system?

To supply the reactive power demand of load and to regulate of output volage at the grid.

Some electrical machines work on the principle of electromagnetic induction. For such events to occur, we need inductor due to which reactive power flows in the circuit. Since, this power is due to the energy storing elements in the circuit like inductor and capacitor.

That is why, we need reactive power in a electric circuit.

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