This paperpresents asingle-phase andthree-presented. Thesimulation study ispresented toverify the phasedynamic voltage restorer (DVR)toprotect the validity andeffectiveness ofthecontrol algorithm. Finally, sensitive loads against thevoltage disturbances dueto three-phase DVR system formediumpowerapplications is short-term abnormal voltage conditions. Thereduceddiscussed andthesystem operation andcontrol scheme are switch-count inverter isadopted inthesingle-phase systempresented toagainst voltage disturbances andimprove voltage to compensate voltage disturbance forlowpower quality attheload side. Somecomputer simulations results are applications. Thefront-end ac/dc converter isusedto provided toevaluate thesystem performance. maintain constant dc-link voltage andprovide the necessary active powerforDVR underthevoltage sag condition. Underthevoltage swell condition, theac/dc Il.SYSTEM CONFIGURATION ANDOPERATION PRINCIPLE converter isoperated asaninverter modetodeliver the active powerbacktotheutility system. Three-phase DVR Fig.1(a)showthesystematic diagram ofa series system withthree single-phase full-bridge inverters isalso compensated distribution system. TheDVRsystem consisted presented to against theabnormalutility voltageofthevoltage source inverter andtheisolation transformation conditions suchasvoltage sag, swell, flicker, harmonic and isconnected inseries between theloadandthepoint of unbalance voltage. Theadopted topology andcontrolcommoncoupling(PCC).Thereisabypassswitchtoconduct strategy areevaluated through several simulation studies.load current attheconditions of1)normal utility voltage; 2) short circuit attheloadside; and3)inverter failure. Themain Keywordsdynamic voltage restorer; voltage regulation; voltagefunction ofDVRistomaintain theloadvoltage against the sag; swell. abnormal voltage conditions. TheDVRshould beoperated to compensate thezeroandnegative sequence components of
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