What is the advantage using the power capacitor bank and an equialent capacitance valued capacitor?

For example , 3300mfd capacitor used in a bank 3 nos . the value of capacitor is 9900 mfd ,instead of 9900 mfd ,10000 mfd 1 no used. Is any advantage over using bank .

Capacitor banks are used to compensate inductive loads such as motors. So capacitors are included when power factor reduces (high inductive load)and are switched off as power factor increases. The capacitors should not overcompensate. Briefly banks are used for variable capacitances.