Abstract—This paper presents the application of dynamic voltage restorer (DVR) on Power distribution systems for mitigation of voltage sags at critical loads. DVR is one of the compensating types of custom power devices. The impedance source inverter employs a unique impedance network couple with inverter main circuit and rectifier. By controlling the shoot through duty cycle, the Z source inverter system using MOSFET provide ride through capability during voltage sags, reduces line harmonics and improves power factor. Simulation results are presented to illustrate and understand the performances of DVR with 8-bus system in supporting load voltages under voltage sags conditions.

Index Terms—Power quality, voltage sags, DVR, Impedance source inverter (ZSC).

1.Research Scholar 2.Professor/EEE Dept
1.Sathyabama University
2.Panimalar Engineering College Chennai,India.Email: 1.dee_soms123@yahoo.co.in

Cite: S. Deepa and S. Rajapandian, "Voltage Sag Mitigation Using Dynamic Voltage Restorer System," International Journal of Computer and Electrical Engineering vol. 2, no. 5, pp. 821-825, 2010.