A Novel Dual Transformer Triple Active Bridge to Interface Renewable Energy Storage and Load

A novel topology of dual transformer triple active bridge is proposed for interfacing renewable energy storage system with the load. This topology uses series connection of dual transformers to reduce the circulating current and the number of semiconductor devices. Phase shift and duty ratio control are used to control the bidirectional power flow and regulate the load voltage. Duty ratio control also results in zero-voltage switching (ZVS) of all the converter switches for the entire input voltage and load range. The converter is designed to reduce switch stress. The simulation of a 1 kW converter is done to verify its performance for a variable load, supply voltage, and bi-directional power flow. From the results, it is found that the topology regulates the output voltage for variations both in supply voltage and load. In the duty ratio controlled topology, all switches turn on with ZVS for all operating cases.