The dc-bias current may result in the magnetic flux saturation and endanger the safe operation of switching devices. By regulating the inductor current slope during the transient, this article proposes a novel transient phase shift control (TPSC) to suppress the dc-bias current in dual-active-bridge (DAB) converters, which is universal for different phase shift control strategies. First, the dc-bias current models under different transient scenarios are built. Then, the optimal switching transient is determined so that the proposed TPSC is able to achieve the possible maximum inductor current slope and the shortest settling time. Furthermore, the settling time is independent of the specific circuit parameters, such as inductance, which improves the universality of the proposed TPSC algorithm. With the TPSC, the inductor current slope, which depends on the appropriate combination of bridge voltages in DAB converters, becomes the sole variable in the practical algorithm implementation. Moreover, the inductor current can be changed linearly rather than in a piecewise linear way. Thus, the implementation of the TPSC becomes straightforward and the complicated calculations in conventional methods are avoided. The proposed TPSC was compared with other advanced dc-bias eliminating strategies experimentally under different transient scenarios. The results show that the TPSC can successfully eliminate the dc-bias current, and the transient process can be accelerated within 12% of a switching cycle.

中文翻译：

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储能系统双有源桥式转换器中的通用瞬态直流偏置电流抑制策略

直流偏置电流可能导致磁通量饱和，并危及开关设备的安全运行。通过调节瞬态过程中的电感器电流斜率，本文提出了一种新颖的瞬态相移控制（TPSC）来抑制双有源桥（DAB）转换器中的直流偏置电流，这对于不同的相移控制策略是通用的。首先，建立了不同瞬态情况下的直流偏置电流模型。然后，确定最佳开关瞬态，以使所提出的TPSC能够实现可能的最大电感器电流斜率和最短的建立时间。此外，建立时间与特定的电路参数（例如电感）无关，这提高了所提出的TPSC算法的通用性。使用TPSC时，电感电流斜率 它取决于DAB转换器中电桥电压的适当组合，在实际算法实现中成为唯一变量。此外，电感器电流可以线性变化，而不是分段线性变化。因此，TPSC的实现变得简单明了，并且避免了传统方法中的复杂计算。在不同的瞬态情况下，将拟议的TPSC与其他先进的直流偏置消除策略进行了实验比较。结果表明，TPSC可以成功消除直流偏置电流，并且瞬态过程可以在开关周期的12％之内加速。电感器电流可以线性变化，而不是分段线性变化。因此，TPSC的实现变得简单明了，并且避免了传统方法中的复杂计算。在不同的瞬态情况下，将拟议的TPSC与其他先进的直流偏置消除策略进行了实验比较。结果表明，TPSC可以成功消除直流偏置电流，并且瞬态过程可以在开关周期的12％之内加速。电感器电流可以线性变化，而不是分段线性变化。因此，TPSC的实现变得简单明了，并且避免了传统方法中的复杂计算。在不同的瞬态情况下，将拟议的TPSC与其他先进的直流偏置消除策略进行了实验比较。结果表明，TPSC可以成功消除直流偏置电流，并且瞬态过程可以在开关周期的12％之内加速。