It is because series capacitors are not meant to be used for that purpose since it could increase the fault current level in the system, while shunt capacitors do.
Series capacitors are used to control the power flow within the grid by changing the transmission line’s reactance as well as improve the angular stability of the system after the fault clearance.
Power flow within grid: (a) without series capacitors, (b) with series capacitors
On the other hand, the shunt capacitors are used to provide reactive power needed by the load. By providing the reactive power for the load, the reactive power which is supplied by the grid will thus decrease, hence the power factor is improved.
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