This paper presents a comprehensive analysis of the current-stress optimization and soft-switching operation isolated bidirectional dual active bridge (DAB) dc-dc converter with unified triple-phase-shift (UTPS) control. On this basis, current-stress-optimized modulation scheme is proposed for DAB, which leads to minimum current stress required transmission power voltage conversion ratio in whole load range. Moreover, full achieved simultaneously. Distinct from previous schemes, optimized...

Dual active bridge (DAB) converters have been widely used in distributed power systems and energy storage equipment. However, the inherent nonlinearity of DAB can cause stability problem, such as output voltage oscillation. In this paper, dynamic behavior a digitally controlled converter with closed-loop controller are studied. First, to accurately study nonlinear dynamics converter, bilinear discrete-time model considering capacitor equivalent series resistance (ESR) digital control delay...

The three-phase dual active bridge (3p-DAB) converter is a promising topology for high power dc-dc conversion due to advantages of bidirectional flow, inherent soft-switching capability, and reduced filter volume. This paper presents comprehensive analysis the duty cycle control (DCC) optimizing performance 3p-DAB. Based on DCC, an optimized modulation strategy proposed minimize conduction losses 3p-DAB in whole load range. extends range with large voltage variations simultaneously. It...

The three-phase dual active bridge (3p-DAB) topology has been widely applied in high power dc-dc conversion, which advantages of bidirectional transfer, inherent soft switching capability and small filter size. phase shift control is the conventional modulation strategy for DAB. However, can't operate converter under at low loads, especially when voltage conversion ratio far from unit ratio. aim this paper to propose a novel simultaneous pulse-widthmodulation (PWM) DAB realize...

In this paper, different order generalized state-space averaging (GSSA) models are derived for a three-phase dual-active-bridge (3p-DAB) dc-dc converter with PWM control scheme. The small-signal model based on GSSA is deduced and comparison between circuit simulation made. Subsequently, closed-loop strategy an optimal limitation unit proposed 3p-DAB converters. can operate the in closed loop any optimized modulation scheme to enhance efficiency other performances. controller parameters be...

The dual active bridge (DAB) converter has been widely used in the distributed power systems and energy storage devices. However, inherent nonlinearity of DAB can cause serious stability problem. In this paper, dynamics a digital controlled with output voltage closed loop control is studied. Firstly, to accurately study nonlinear converter, full discrete-time model for established. considers ESR capacitor also delay sample-and-hold process. Using model, versus parameter proportional...

This study presents a generalised analysis of isolated bidirectional dual active bridge (DAB) dc–dc converter with triple‐phase‐shift (TPS) control. The multifrequency approximation is used to analyse performance characteristics DAB, and novel numerical solver developed determine the optimised modulation scheme based on TPS Specially, proposed can be considered as unified for determining operation DAB required transmission power voltage conversion ratio. average model then described in this...

This paper proposes the novel predictive valley-peak current control for dual active bridge (DAB) converter to improve dynamic responses. Theoretically, reference can be achieved in one switching cycle with this strategy. Since inductor valley and peak currents are both controlled, strategy offers a fast over-current switch protection, meanwhile eliminates possible saturation of high-frequency transformer. In paper, detailed analyses stability properties presented. Further, discusses...

The dual active bridge (DAB) converters are widely used in the energy storage equipment and distributed power systems. However, existence of switching nonlinearity control delay can cause serious stability problem to DAB converters. Thus, this paper, studies a digitally controlled converter with an output voltage closed loop controller. Firstly, accurately study converter, discrete-time model established whole period is obtained. considers capacitor ESR, digital delay, sample-and-hold...

This paper proposes two fast transient current control (FTCC) methods for three-phase dual-active-bridge (3p-DAB) dc-dc converters under PWM strategy with three variables. The proposed can balance phase inductor currents and avoid the oscillations in dc when duty cycles are changed abruptly caused by transmission power. space-vector method superposition theorem applied to analyze steady-state dynamic behavior of a 3p-DAB converter. According analysis results, approaches presented enable...

This paper proposes an optimized modulation scheme for the dual active bridge (DAB) converter, which leads to minimum current stress in whole load range. The effective switching modes are distinguished by three control parameters: two inner phase-shift ratios and outer ratio. derives expressions of transmission power each mode, taking parameters as variables. Karush-Kuhn-Tucker (KKT) conditions then applied derive local optimal minimizing closed-form solutions ranges. By combining mode...

As the E-Booster is widely used, its stability and safety are receiving more attention. However, nonlinear characteristics causes interference in describing system characteristics. In this paper, a least squares (NLS) method proposed to extract hydraulic characteristics, then control corrected by predicting idle stroke improve performance. First, reasons that lead deterioration of braking performance after vehicle passes over washboard surface analyzed. The open-loop gain changed due...