Abstract
In order to achieve a comprehensive performance optimisation consisting of transmission power balance, high efficiency, and fast dynamic response for the output parallel dual-active-bridge (DAB) dc–dc converters in power electronic traction transformer, an optimised power control and balance scheme based on extended phase-shift (OPCB-EPS) control is proposed in this study. By combining current stress-optimised calculation with EPS control, the current stress of converters can be reduced significantly and the efficiency can be further improved. In addition, the desired transmission power of DAB converters is estimated on-line by introducing the virtual voltage component to enhance the dynamic response of the output voltage under the input voltage fluctuation and the load disturbance conditions. Meanwhile, the proposed OPCB-EPS scheme can realise the transmission power balance over the whole power range. Finally, a scale-down prototype of DAB dc–dc converters consisting of three cells is developed to compare the performance of the current stress optimised with dual phase-shift (CSO-DPS), current stress optimised with EPS and proposed OPCB-EPS schemes. The comparative experimental results have verified the excellent performance of OPCB-EPS scheme and the theoretical analysis in this work.
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