THREE-PHASE SYSTEM AND DISTRIBUTED CONTROL METHOD THEREOF

Disclosed are three-phase system (100) and distributed control method. The three-phase system (100) comprises three-phase circuits (11, 12, 13), of which each phase circuit (11, 12, 13) including at least one power conversion cell (111, 121, 131); and at least three phase controllers (10, 20, 30) for controlling each phase circuit, respectively, each phase controller (10, 20, 30) including a communication interface through which the at least three phase controllers (10, 20, 30) are in communications connection with each other; wherein the phase controllers (10, 20, 30) of each phase circuit (11, 12, 13) is configured for regulating bridge arm voltages (v, v, v) of the at least one power conversion cell (111, 121, 131) in the phase circuit by receiving signals sent from the phase controllers of other two phase circuits through the communication interface. The three-phase system (100) and the distributed control method of the invention solve problems of balance of three-phase current and stabilization of three-phase DC voltages by coordination among the three phases. Thanks to the invention, the three phases can be independently controlled to improve control flexibility.