Generalized Small-Signal Modelling of Dual Active Bridge DC/DC Converter

Hebala, Osama M.; Aboushady, Ahmed A.; Ahmed, Khaled; Burgess, Sam; Prabhu, Radhakrishna

doi:10.1109/icrera.2018.8567014

Cited by 13 publications

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, evaluating complex topologies necessitates a detailed analysis of the converter's response for a wide range of parameters, which can be time-consuming due to multiple iterations [24,25]. In the analysis of the DAB, as for other converters, different points of view and abstraction levels need to be considered, e.g., the ideal behavior (steady state, dynamics), analysis of loss mechanisms, optimization of parameters and control [20][21][22]. Although simulation software can model parasitic effects of converters, sample-based simulations in the time domain (using iterative numerical solvers) may be too computationally intensive for the fast iteration of design and control choices [23].…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

et al. 2022

View full text Add to dashboard Cite

In the field of power electronics-based electrical power conversion, the Dual Active Bridge (DAB) topology has become very popular in recent years due to its characteristics (e.g., bidirectional operation and galvanic isolation), which are particularly suitable to applications such as interface to renewable energy sources, battery storage systems and in smart grids. Although this converter type has been extensively investigated, its analysis and control still pose many challenges, due to the multiple control variables that affect the complex behavior of the converter. This paper presents a theoretical model of the single-phase DAB converter. The proposed model is very general, i.e., it can consider any modulation technique and operating condition. In particular, the converter is seen as composed by four legs, each capable of generating voltage on the inductor, and by the two output legs, which can steer the resulting inductor current to the load. Three variables are considered as the control inputs, i.e., the phase-shifts with respect to one leg. This approach results in a very simple yet accurate closed-form algorithm for obtaining the inductor current waveform. Moreover, a novel analytical model is proposed for calculating the average output current, based on the phase-shift values, independently of the output voltage. It is also shown that average output current can be varied cycle-by-cycle, with no further dynamics. In fact, average output current is not affected by the initial value of inductor current or by DC offset (which may arise during transients). The proposed models can be exploited at several stages of development of a DAB: during the design stage, for fast iteration, when selecting its operating points and when designing the control. In fact, based on the analytical results, a novel control loop is proposed, which adopts a “fictitious” (i.e., open-loop) inner current regulation loop, which can be applied to any modulation scheme (e.g., Single Phase-Shift, Triple Phase-Shift, etc.). The main advantage of this control scheme is that the simple dynamics of the output voltage versus the average output current can be decoupled from the complicated relationship between the phase-shifts and the output current. Moreover, a Finite Control Set (FCS) method is proposed, which selects the optimal operating points for each operating condition and control request, ensuring full Zero-Voltage Switching (ZVS) in all cases. The analytical results obtained and control methods proposed are verified through simulations and extensive experimental tests.

show abstract

Section: Introductionmentioning

confidence: 99%

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

et al. 2022

View full text Add to dashboard Cite

show abstract

DC fault analysis of solid‐state transformer using circuit equivalent

Kamble,

Chaturvedi,

Borghate

et al. 2024

Circuit Theory & Apps

View full text Add to dashboard Cite

The use of power converters in modern power systems is making the system more active. To enhance the future power grid's reliability, efficiency, interactivity, and security, digital controllers and power electronic circuits are being employed. One critical component of the power system is the 50‐Hz transformer, which is currently robust. However, there is growing interest in solid‐state transformers (SSTs) or power electronic transformers (PETs) as potential alternatives to conventional transformers. These alternatives are particularly relevant for the future grid, which will have a high penetration of renewable energy sources, electric vehicles, and nonlinear loads. To analyze the impact of faults in the power network, it is necessary to establish an accurate circuit model for SSTs, which has not been adequately addressed in the existing literature. This research paper proposes an averaged representation of SSTs and compares the results of switched and averaged models under varying load conditions for the designed SST. Additionally, an equivalent circuit model is developed for DC fault analysis using transformation techniques and a transformer analogy to shift parameters to the DC fault location. The proposed circuit equivalent model is compared with the switched model, offering accurate and efficient results for a pole‐to‐pole and pole‐to‐ground DC fault.

show abstract

Small-Signal Modeling of Modular Multilevel DC Transformer

Hou

Min

et al. 2021

Proceedings of 2020 International Top-Level Forum on Engineering Science and Technology Development Strategy and the 5th PURPLE

View full text Add to dashboard Cite

Generalized Small-Signal Modelling of Dual Active Bridge DC/DC Converter

Cited by 13 publications

References 22 publications

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

Analytical Modeling and Control of Dual Active Bridge Converter Considering All Phase-Shifts

DC fault analysis of solid‐state transformer using circuit equivalent

Small-Signal Modeling of Modular Multilevel DC Transformer

Contact Info

Product

Resources

About