The　penetration　level　of　distributed　generation　(DG)　grows　rapidly　bringing　more　frequency　fluctuation　nowadays.　Besides,　the　power　system　grows　in　size　day　by　day;　the　assumption　that　the　frequencies　are　the　same　across　the　grid　is　no　longer　valid.　These　all　bring　out　problems　to　the　frequency　control　mechanism　currently　used.　The　recently　proposed　rotor　angle　control　strategy　may　solve　these　problems.　Apart　from　suppressing　low-frequency　oscillations　(LFO)　more　effectively,　the　new　control　strategy　may　also　replace　automatic　generation　control　(AGC)　presently　used.　The　balance　between　generations　and　loads　can　be　restored　quickly　and　automatically　after　the　loads　change.　No　intervention　from　a　dispatching　centre　is　needed.　However,　the　currently　proposed　rotor　angle　controller　has　an　integration　block.　This　will　lead　to　negative　damping　torque　for　very　low　frequency　input　and　frequent　turbine　valve　adjustment.　Removing　the　integration　block　from　the　controller　can　solve　these　problems.　The　control　strategy　will　become　a　kind　of　angle　droop　control　then.　The　rotor　angle　droop　(RAD)　control　can　also　maintain　generation　load　balance　and　restore　frequency　to　rated　value　without　the　intervention　of　a　dispatching　centre　since　it　is　also　decentralized　and　autonomous.　Besides,　the　new　strategy　will　distribute　load　variance　(although　not　precisely)　to　generators　according　to　their　rated　capacity.