Autonomous Distributed Power Network Consisting of Triple Active Bridge Converters

This paper proposes an autonomous distributed power network consisting of triple active bridge (TAB) converters for constructing a locally-produced-and-consumed power interchange system that can meet many types of user requirements in small developing economies. A TAB converter with detachable AC/DC converter units controls the direction and magnitude of power flows between three ports regardless of DC or AC power. We constructed a prototype TAB converter rated at 400 V and 10 kW. We tested the power-flow control and measured the step response of the DC power when the command value of the DC power was abruptly changed. The experimental results revealed that our decoupling power-control methodology is appropriate to control the power flow of our prototype TAB converter in stand-alone operation. We also constructed an autonomous distributed power network testbed consisting of the TAB converters as network nodes and explored a digital-twin model in mutually-connected operation for developing a power flow control system of our autonomous distributed power network.

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