Investigation of multi-functional DVR to improve power quality characteristic

The dynamic voltage restorer (DVR) is an effective solution for power quality problems related to the voltage. In this paper, a multi-functional DVR presented that in addition to compensating voltage sag and voltage swell can limit fault current and keep constant large variation of the system frequency. In this multi-functional DVR the minimum energy theory for reducing active power that consuming or absorbing is considered. The simulation results obtained by PSCAD/EMTDC to verify the effectiveness of the multi-functional DVR and its control strategy for power quality improvement.

[1]  Gerard Ledwich,et al.  Compensation of distribution system voltage using DVR , 2002 .

[2]  F. Blaabjerg,et al.  Control and testing of a dynamic voltage restorer (DVR) at medium voltage level , 2003, IEEE Transactions on Power Electronics.

[3]  Arindam Ghosh,et al.  Critical load bus voltage control using DVR under system frequency variation , 2008 .

[4]  M. Barnes,et al.  Voltage sag detection technique for a dynamic voltage restorer , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[5]  D.M. Vilathgamuwa,et al.  A series compensator with fault current limiting function , 2005, IEEE Transactions on Power Delivery.

[6]  A. Ghosh,et al.  Design of a capacitor-supported dynamic voltage restorer (DVR) for unbalanced and distorted loads , 2004, IEEE Transactions on Power Delivery.

[7]  F. Blaabjerg,et al.  A Dual-Functional Medium Voltage Level DVR to Limit Downstream Fault Currents , 2006, IEEE Transactions on Power Electronics.