期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 35, 期 2, 页码 2184-2195出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2922299
关键词
DC-bias flux; instantaneous flux and current control (IFCC); soft magnetization/demagnetization technique; three-phase dual-active bridge (DAB3) converter; trajectory control; alpha beta stationary frame
资金
- German Federal Ministry of Education and Science (BMBF), Flexible Electrical Networks (FEN) Research Campus [FKZ03SF0490]
The three-phase dual-active bridge converter is a promising topology for the high-power high-frequency dc-dc conversion, due to the soft-switching capability and inherent galvanic isolation. With the state-of-the-art instantaneous current control (ICC) based on the single phase-shift (SPS) operation, a bidirectional power flow can be controlled dynamically between two dc ports without inducing overshoots in the transformer currents. However, a transient dc-bias flux may still occur in the transformer, which may cause the transformer core saturation in the dynamic operation such as start-up, power-OFF, and abrupt load changes. To analyze and address this issue, this paper presents a set of model-based methods to avoid inducing the dc-bias flux in various transient situations. The proposed double-side SPS operation could nullify the dc-bias flux in abrupt load changes and even instant power-flow reversals. Furthermore, the soft-magnetizing and soft-demagnetizing techniques are presented to eliminate the initial and residual dc-bias flux during start-up and power- OFF instantly. The proposed flux control method can be integrated with the ICC. Thus, the transformer magnetizing flux and the winding currents can be controlled simultaneously and instantaneously in transient situations. Simulations and experiments on a down-scaled hardware prototype validate the effectiveness of the proposed methods.
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