Mitigation of voltage fluctuation in the transmission line by using SEN transformer

The resent electrical power system is more complicated. So, there are many disturbances that occur in the system like voltage sag and swell, fault, unbalance loading, uncontrolled power flow, etc. The SEN transformer (ST) is one of the devices to regulate the power flow in the system. In this paper, the ST has been used to mitigate voltage sag and swell in the transmission line with different phase angle of injecting voltage. The SEN transformer has the advantage of controlling active power flow and reactive power flow in the line independently like UPFC. In this paper, the ST is simulated in MATLAB/ SIMULINK for compensating voltage in transmission line during fault condition for maintaining constant voltage profile of the system. ST is more reliable and cost-efficient than other devices and its usage is also proven.