Comparison between Shunt compensation and Synchronous phase modifier

Below is comparison between shunt and Synchronous phase modifier.

Sr No.	Shunt Compensation	Synchronous Phase modifier
1.	A Separate Shunt capacitor and reactor is required for voltage control	A single unit of synchronous motor is used as an inductor with under excitation and used as a capacitor with overexcited for voltage control
2.	Step by step voltage regulation is possible	Smooth voltage regulation not possible
3.	No starting methods are required	Starting methods required for synchronism
4	Consume reactive power only	Consume active power
5	Transient stability improves	Transient stability reduced
6	Requires less maintenance	Requires more maintenance because of rotating device
7	They have very low cost	Cost is more
8	Most practical for voltage control	Not used practically due to above disadvantages