Direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation

The invention discloses a direct-current-side distributed hierarchical control method for hybrid microgrid bidirectional transducers in isolated island operation. A bottom hierarchy adopts droop control based on local information; a second hierarchy adopts a direct-current-side voltage distributed secondary control strategy; a third hierarchy adopts a strategy that a direct-current bus voltage of each bidirectional transducer is received to obtain a real-time average value of the direct-current bus voltages by means of direct-current bus voltage estimation and the real-time average value of the direct-current bus voltages is taken as a reference voltage value of a voltage secondary controller. By adoption of the direct-current-side distributed hierarchical control method, distributed control of the plurality of bidirectional transducers in isolated island operation can be realized, and the problem of uncontrollable voltage drop of a hybrid microgrid in isolated island operation when an upper central controller is in communication failure due to traditional hierarchical control strategies can be solved theoretically.