Abstract
This paper introduces a modulation technique for the single-phase dual active bridge (DAB) in which the switching frequency and transformer flux linkage are modulated to achieve improved power transfer characteristics and reduced converter losses. By analysing the DAB, it is noticed that in the traditional single phase shift (SPS) modulation, the transformer flux linkage decreases with increasing power. The proposed flux control modulation (FCM) counteracts this decrease and aims to keep the transformer utilisation constant on the whole load range by a reduction in switching frequency. This has two effects: first, the reduced frequency substantially lowers switching losses and second, the power transfer characteristic of the DAB is linearised, facilitating the control of this converter. The new modulation technique is validated by simulation.
Highlights
Power electronics is a key enabling technology in the development of next-generation aircraft systems
When analysing the traditional single phase shift (SPS) modulation for the dual active bridge (DAB), it becomes clear that the peak flux linkage of the transformer decreases with increasing power transfer
Based on thorough analytical modelling of the DAB, this paper introduces an improved modulation technique called flux control modulation (FCM), which is derived from SPS modulation
Summary
Power electronics is a key enabling technology in the development of next-generation aircraft systems. The more electric aircraft (MEA) is a concept aiming to replace traditional hydraulic, pneumatic, mechanical, and other systems with more efficient, lightweight, and reliable electrical systems, cutting down fuel consumption and operating cost [1, 2] This trend pushes the aircraft electrical power system (EPS) to the multi-megawatt range. When analysing the traditional single phase shift (SPS) modulation for the DAB, it becomes clear that the peak flux linkage of the transformer decreases with increasing power transfer. By variation of the switching frequency, FCM aims to keep the utilisation of the transformer core constant on the whole load range This improves the overall operating efficiency of the DAB and linearises the power transfer characteristic of the DAB and simplifies the control design of the converter.
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