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This paper analyzes a DC-DC Dual Active Bridge (DAB) converter in order to obtain Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS) in all the switches for any power range. This analysis shows the conditions that should be fulfilled to achieve ZVS and ZCS; also, it presents all the DAB switching modes that appear when a triple phase shift (TPS) modulation is used. Soft switching reduces...
The control system described in this work tunes a digital controller to achieve the specified phase margin and crossover frequency by applying a design method based on the measured frequency response of the DC/DC converter, identified by the system itself. The converter is working closed-loop from the start but with a simple controller, so the output voltage remains regulated though does not meet...
A DC-DC Dual Active Bridge (DAB) converter is analysed in this paper to obtain the conditions that allow having Soft Switching (Zero Voltage Switching or Zero Current Switching) using Triple Phase Shift modulation for any power range. Since Soft Switching reduces the switching losses, the efficiency is improved. The theoretical results are validated with a 250W prototype.
Batteries have become the most popular energy storage devices due to several features like high energy density, durability and safety. Nowadays batteries are used in fuel cells based on hybrid electric vehicles, as a zero emissions alternative transportation. In order to size and design the energy management of this type of systems, the designer requires an easy equivalent model of battery. This paper...
Current trends in power distribution systems are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since interactions between converters can cause stability problems. To analyze these interactions, it is needed to know the behavior of converter impedances. Moreover, distributed power systems are typically comprised of subsystems made up...
The control system described in this work implements automatically a digital controller that achieves the highest possible cross-over frequency for the specified phase margin by applying a design method based on the measured frequency response of the DC/DC converter, identified by the system itself. The algorithms for the design, identification process and control of the converter are implemented...
Current trends in power distribution systems are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since a network of power electronic converters is required to distribute power with appropriate performance. One of the main issues deals with the control loop design of the converters when they are loaded by other converters downstream....
This work presents a modular architecture based on the input series output parallel (ISOP) connection of Full Bridge Phase Shifted power converters with a common input filter. The modeling of the converter architecture taking into account the effect of the common input filter is the previous step to the controller design in order to ensure a proper regulation of external converter quantities, such...
The overall mass, size and cost of a propulsion system (which comprises the fuel cell stack and hydrogen tank, dc/dc converters, and energy storage devices) implemented in a fuel cell based vehicle, not only depends on the implemented propulsion system topology and control strategy, but also on the driving profile and the fuel cell operating features. This paper analyzes the impact of both the driving...
Distributed Maximum Power Point Tracking (DMPPT) architectures are one of the most promising solutions to overcome the drawbacks associated to mismatching phenomena in photovoltaic (PV) applications. In these PV architectures, there is a DC-DC converter dedicated to perform the Maximum Power Point Tracking (MPPT) for each PV panel. In order to have the greatest flexibility, the converter needs to...
In systems with regenerative loads, bidirectional converters are used in order to manage the power flow between the sources and the loads. This paper is focused in the dynamic performance of the Synchronous Buck converter applied to Hybrid Electric Vehicle (HEV) regenerative power systems. Some simple design rules are given in order to reach the best dynamic performance in the system, regardless of...
In order to overcome the solar energy harvesting problem caused by photovoltaic (PV) panel mismatches, Distributed Maximum Power Point Tracking (DMPPT) architectures can be found in the literature. In these PV architectures, there is a DC-DC converter per PV panel, which has the function of operating the PV panel at its maximum power point (MPP). Other required specifications for the converters applied...
The propulsion system implemented in a fuel cell based vehicle strongly affects the mass, cost and volume of the overall system. The design of a propulsion system architecture, which comprises different power converters and secondary energy storage systems, is closely related to the driving profile applied, since the power and energy requirements depend on the driving profile. This paper tackles the...
Current trends in power distribution systems are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since a network of power electronic converters is required to distribute power with appropriate performance. Moreover, they are typically comprised of subsystems made up by a variety of manufacturers, which do not provide the data required...
The design of linear compensators is usually based on the frequency response of the system, considering phase margin PM and cross-over frequency fc as the initial specifications. Applying the k-factor method for synthesis of linear compensators, not all combinations of fc and PM yield feasible or stable designs, and in many cases the design procedure is based on a trial and error procedure. The objective...
Current trends in power distribution systems, such as telecommunications, computers, transportation and utility grid applications, are focused on distributed architectures instead of centralized approach. Distributed architectures are more complex since a network of power electronics converters is required to distribute power with appropriate performance. Hence, new challenges regarding integration...
This paper is focused on the assessment of a modular architecture based on the Dual Active Bridge (DAB) converter in input series, output parallel (ISOP) connection. Previous works have dealt with modeling and control techniques to ensure a proper voltage and power sharing among the modules. In this paper an experimental evaluation of the behavior of the DAB in ISOP connection is carried out in order...
This work presents the analysis of the behavior of a modular system of DC/DC converters with input-series output-series connections. The goal is to explore a simple solution that provides a stable operation by connecting totally independent converters working in DCM, except one of them (working in CCM) that determines the input-output voltage ratio. This alternative can be applicable when the input...
This paper analyzes the behavior of a modular system of DC/DC converters with input-series output-series connections. Modularization is a good alternative to provide higher voltage capability, reduce the cost by using the same module to build different power converters or even increase the performance in some cases. However, the control of the converters should be considered carefully, since the system...
This paper is focused on a power converter system based on Dual Active Bridge modules input-series and output-parallel connected (ISOP). Converter modularization is a promising technique from a practical point of view, providing higher input voltage, lower cost and better performance. On the other hand, Dual Active Bridge converter is an interesting topology in bidirectional applications. However,...
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