Closed-Form Asymmetrical Duty-Cycle Control to Extend the Soft-Switching Range of Three-Phase Dual-Active-Bridge Converters
点击次数：
影响因子：5.967
DOI码：10.1109/TPEL.2021.3055369
发表刊物：IEEE Transactions on Power Electronics
关键字：Active thermal balancing (ATB), asymmetrical duty-cycle control (ADCC), dead-time compensation (DTC), hybrid modulation schemes, soft switching, three-phase dual-active bridge
摘要：The three-phase dual-active-bridge (DAB) converter is a promising topology for high-power dc–dc conversion in dc grids and industrial applications. However, the conventional single-phase-shift modulation shows a limited soft-switching range and large reactive currents under light-load operation especially with large voltage variations. This article proposes an asymmetrical duty-cycle control method for the three-phase DAB to extend the soft-switching range and reduce reactive currents by realizing three-phase triangular- and trapezoidal-current-mode operation. Closed-form solutions of the proposed modulation schemes are derived that enable a simple online calculation of the control parameters. The proposed modulation schemes can substantially reduce losses of both power semiconductor devices and the medium-frequency transformer. Thus, the three-phase DAB converter can realize high efficiency over a wide operation range, especially under light-load conditions. Considering the practical implementation, a compensation method is presented to correct the distorted current waveforms caused by the dead time and ensure the desired soft-switching operation. Besides, the power loss imbalance between top and bottom switches induced by the asymmetrical duty cycle is addressed by an active thermal balancing strategy. The effectiveness of the proposed method is validated by simulation results and experiments on a downscaled converter prototype.
论文类型：期刊论文
学科门类：工学
文献类型：J
卷号：36
期号：8
页面范围：9609-9622
ISSN号：0885-8993
是否译文：否
发表时间：2021-01-28
收录刊物：SCI
发布期刊链接：https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=63