Dynamic Voltage Restorer

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Dynamic Voltage Restorer

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This project introduces and evaluates an auxiliary control strategy for downstream fault current interruption in a radial distribution line by means of a dynamic voltage restorer (DVR). The proposed controller supplements the voltage-sag compensation control of the DVR. It does not require phase-locked loop and independently controls the magnitude and phase angle of the injected voltage for each phase. Fast least error squares digital filters are used to estimate the magnitude and phase of the measured voltages and effectively reduce the impacts of noise, harmonics, and disturbances on the estimated phasor parameters, and this enables effective fault current interrupting even under arcing fault conditions. The results of the simulation studies performed in the PSCAD/EMTDC software environment indicate that the proposed control scheme: 1) can limit the fault current to less than the nominal load current and restore the point of common coupling voltage within 10 ms; 2) can interrupt the fault current in less than two cycles; 3) limits the dc-link voltage rise and, thus, has no restrictions on the duration of fault current interruption; 4) performs satisfactorily even under arcing fault conditions; and 5) can interrupt the fault current under low dc-link voltage conditions.


  • There is no inverter in the transmitting side.
  • Less power transmission


  • The inverter will boost more power to the receiving coil.


  • Small size
  • Fast dynamic response
  • High efficient


block diagram for dynamic voltage restorer



  • PIC Controller
  • Driver Board
  • Single phase inverter
  • RL circuit




In this project an overview of DVR and it  is protected from voltage sag and swell . DVR is an effective custom power device for voltage sags and swells mitigation. The impact of voltage sags on sensitive equipment is severe. Therefore, DVR is considered to be an efficient solution due to its relatively low cost and small size, also it has a fast dynamic response . The DVR handles both balanced and unbalanced situations without any difficulties and injects the appropriate voltage component to correct rapidly any anomaly in the supply voltage to keep the load voltage balanced and constant at the nominal value.


[1] IEEE Std. 1159 – 1995, “Recommended Practice for Monitoring Electric Power Quality”.

[2] P. Boonchiam and N. Mithulananthan, “Understanding of Dynamic Voltage Restorers through MATLAB Simulation,” Thammasat Int. J. Sc. Tech., Vol. 11, No. 3, July-Sept 2006.

[3] K.Youssef, “Industrial power quality problems Electricity Distribution,” IEE Conf. Pub1 No. 482, Vol: 2, 18-21 June 2001 Pages: 5 pp. vo1.2

[4] A. Ghosh and G. Ledwich, “Power Quality Enhancement Using Custom Power Devices,” Kluwer Academic Publishers, 2002.

[5] R. McHattie, “Dynamic Voltage Restorer the Customer’s Perspective,” in IEE Colloquium on Dynamic Voltage Restorer – Replacing Those Missing Cycles, 1998, pp. 1/1-1/5.

[6] S. Chen, G. Joos, L. Lopes, and W. Guo, “A nonlinear control method of dynamic voltage restorers,” in 2002 IEEE 33rd Annual Power Electronics Specialists Conference, 2002, pp. 88-93

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Additional information

Weight3.000000 kg


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