How is the voltage profile increased by using capacitor bank..

It's not. The phase relationship between voltage and current is.

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Originally Posted by KeepItSimpleStupid

It's not. The phase relationship between voltage and current is.

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Can u explain it in clear...

Voltage is delivered as say 120 V, 60 Hz, so that never changes, capacitor or no capacitor, the utility will adjust so voltage is constant.

Power is equal to V * I * cos (theta) when the current is sinusoidal and the voltage is sinusoidal. Theta is the phase angle between voltage and current and is 1 for resistive loads.

AC inductor circuits : REACTANCE AND IMPEDANCE -- INDUCTIVE

Current lags voltage by 90 deg in a pure inductor.

Current leads voltage by 90 deg for a pure capacitor.

By automagicly adding capacitors, you can force the phase angle to be close to zero. Power factor = 1, cos(0deg) = 1

Commercial customers typically get charged a premium when their power factor is low because the utilities transmission lines have to be bigger.