In this paper, aiming at solving multi-source coordination control problem in micro-grid, an autonomous control strategy which is not based on central controller (MGCC) and on communication has been proposed. This strategy mainly consists two sub-strategies: A micro-grid autonomous control strategy (ACS) base on state classification and a micro-source control strategy based on Carrier Sense Multiple Access with Collision Detection (CSMA/CD) mechanism. At different state levels, state

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... ion control strategy adopts different control strategies for micro-sources by establishing system state classification model and evaluating system operation state. Thus, the operation state of each unit can be optimized from the system level; time-sharing control strategy which is based on CSMA/CD mechanism, quantifies the priority of participating level for each Controllable Micro-Generator (CMG). Thus, system can guarantee the control order for micro-sources and the uniqueness of main source. Hence, with the proposed ACS, one master distributed generator (MDG) can be decided when facing the state change of micro-grid. Then, some negative effects including current circulation caused by multi distributed generators (DGs) and distributed sources (DSs) adopting VF or droop control can be solved. So the stability of system can be improved. Simulation results based on PSCAD/EMTDC platform are presented to show the validity of the proposed ACS.