Power Systems
Advantages of shunt compensation is/are

 smooth voltage regulation is possible by controlling excitation
All of these
 It requires less maintanance
 single unit can be used as both capacitance and inductor by adjusting the excitation

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus i
 which is connected between bus i and bus j with positive sign
 sum of admittances connected at bus j

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