In　order　to　use　remote　wind　power/solar　energy,　the　scale　of　power　grid　interconnection　grow　rapidly.　If　transient　stability　can　be　increased　when　faults　happen　on　tie　lines,　the　transmission　capacity　can　be　increased　too.　Dynamic　braking　can　increase　transient　stability　by　increasing　deceleration　area,　but　it＇s　difficult　to　coordinate　several　braking　devices　and　calculate　braking　amount　in　real　time.　Things　are　no　longer　so　after　rotor　angle　droop　(RAD)　controllers　are　deployed　across　the　power　system.　Since　all　rotor　angles　of　generators　will　be　fixed　in　rotating　coordination　system　determined　by　global　position　system　(GPS)　pulse　per　second　(PPS)　signal,　dynamic　braking　amount　can　be　calculated　by　RAD　controller　by　using　local　speed　and　rotor　measurement.　This　paper　shows　the　revised　equal　area　criteria　(EAC)　when　this　kind　of　dynamic　braking　is　used.　The　relationships　between　RAD　controller　parameter　(saturation　threshold)　and　the　braking　effect　are　also　investigated.　Simulation　results　in　IEEE　68　nodes　system　show　that,　by　applying　dynamic　braking　on　several　generators　simultaneously,　critical　clearing　time　can　be　increased　dramatically　when　faults　happen　on　tie　lines.　©　2018　IEEE.