This　paper　proposes　a　novel　control　algorithm　to　enhance　the　fault　ride-through　(FRT)　capability　of　a　photovoltaic　(PV)　system.　In　this　method,　the　overcurrent　of　the　grid-tied　inverter　is　suppressed　to　a　preset　value　using　model　current　predictive　control　(MCPC)　algorithm,　and　its　DC-link　overvoltage　is　removed　using　a　non-maximum　power　point　tracker　(non-MPPT)　algorithm.　Therefore,　the　inverter　overcurrent　and　its　DC-link　overvoltage　problems　can　be　placed　under　decoupling　control　using　a　DC/AC　converter　controller　and　DC/DC　converter　controller,　respectively.　Using　eight　switching　modes　for　the　three-phase　inverter,　the　MCPC　of　DC/AC　converter　controller　establishes　a　value　function　between　the　current　reference　value　and　output　current　value.　Then,　by　introducing　the　switching　mode　(corresponding　to　the　minimum　value　function)　into　the　DC/AC　converter　controller,　if　the　current　reference　is　set　at　the　rated　value,　the　inverter＇s　output　current　can　be　inhibited　to　the　rated　value　under　fault　conditions.　Moreover,　a　balanced　three-phase　rated　current　can　always　be　obtained　under　either　a　symmetric　or　asymmetric　fault.　However,　together　with　the　MCPC,　a　DC-link　overvoltage　will　appear.　To　remove　this　DC-link　overvoltage　quickly,　based　on　the　grid　system　voltage　sag　level,　the　non-MPPT　algorithm　is　used　to　calculate　the　adjusted　power　for　PV　arrays.　Then,　based　on　the　calculated　power,　the　amended　duty　cycle　can　be　obtained　and　immediately　introduced　into　the　DC/DC　converter　controller　to　tune　the　PV　arrays＇　output　power,　which　significantly　decreases　the　power　imbalance　between　the　inverter＇s　AC　and　DC　sides,　thus　inhibiting　the　DC-link　overvoltage.　In　addition,　to　inhibit　DC-link　voltage　fluctuations　further,　DC-link　voltage　feedforward　compensation　is　introduced　into　the　DC/DC　converter　controller.　In　particular,　under　an　asymmetric　fault　condition,　with　the　help　of　the　voltage　feedforward　compensation,　the　second　harmonic　frequency　components　of　the　DC-link　voltage　can　also　be　removed.　Finally,　based　on　the　theoretical　derivation　and　simulation　results,　it　can　be　proved　that　the　major　problems　troubling　a　PV　system＇s　FRT　technologies　can　be　resolved　by　the　proposed　method,　especially　the　problem　related　to　the　harmonic　components　of　the　DC-link　voltage.　©　2013　IEEE.