Friday, November 14, 2014

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