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Efficiency is one of the most important aspects to consider in the design of electric systems for mobility applications. In this study, the interface between the storage system and the inverter is considered. This interface is a step-up DC-DC converter aimed to boost the energy storage voltage to the inverter voltage. This paper introduces the analysis, design, and comparison of four topologies of...
This paper presents an analytical investigation of the three-phase single active bridge DC-DC converter. First, multiple operation modes have been identified, that can be distinguished by the shape of the phase currents. For every single operating mode, analytical equations have been derived in order to describe the currents of both input and output bridge. In this paper, two operating modes are selected...
In this paper hybrid non isolated and non-invertingCockcroft-Walton multiplier based 2Nx InterleavedBoost converter (2Nx IBC) for renewable energy applications is presented. The presented hybrid boost converter topology is derived from non-inverting Nx Multilevel Boost Converter (Nx MBC) and inverting Nx Multilevel Boost Converter (Nx MBC). In renewable energy applications, generated voltage needs...
A bidirectional DC-DC converter with high voltage gain and wide input and output voltage range is presented. The input voltage range is 30 V to 60 V and the output voltage range is 100 V to 400 V. The nominal power is 10 kW. The converter is based on a Dual Active Bridge in which the voltage range has been extended with a tap changer between the transformer and the high voltage H-bridge.
Electrification of vehicle accessories often requires the application of low voltage high current step up DC-DC converter with a high voltage gain ratio qualified for use in an automotive environment. The proposed topology provides step-up on low voltage side that reduces the transformer turns ratio, leading to a simplified transformer design with reduced cost and increased efficiency which is especially...
In this paper a novel Multi-Input-Single-Output (MISO) Boost Converter topology for renewable energy systems is proposed and presented. This proposed topology will be used to obtain different output voltage levels from several power sources, such as wind turbines, photovoltaic arrays, fuel cells, etc. Multi-Input-Single-output converters provide flexibility in terms of the choice and the availability...
In order to increase the conversion efficiency in photovoltaic (PV) systems, different configurations and topologies were developed. Depending on the application, the converters used for grid connection are built using one or two conversion stages. The advantages of the converters with a DC-stage are mainly the distributed maximum power point tracking algorithm per PV string, a wider range of operation,...
DC grid technology is regarded as a promising solution for future electric networks integrating a great amount of renewable energies. It calls for high efficiency dc-dc converters with high step-up ratio to interconnect medium voltage (MV) dc distribution grids and high voltage (HV) dc transmission grids. This paper presents an isolated soft-switching dc-dc converter combining two-level converters...
Solar energy is becoming increasingly popular day by day, so are grid-connected solar power generation systems. This paper proposes a solar power generation system with a seven-level inverter. A DC-DC power converter is used to boost the output voltage of the solar panel, which is controlled using MPPT. The capacitors of the capacitor selection circuit are charged with multiple relationships by the...
A small-signal model for the Input-Series Output-Parallel (ISOP) DC-DC converters is developed in this paper. The proposed model is obtained applying the State-Space Averaging technique. The ISOP DC-DC converter consists of multiple DC-DC modules connected in series at the input and in parallel at the output. In this paper, the ISOP DC-DC converters are used in combination with the 5-level unidirectional...
This paper presents a Multi-Phase Sliding Mode(MPSM) Control Strategy for solving chattering issues inherently existing in DC-DC converters. The main idea of the proposed methodology is to implement a MPSM Control for geometrically nullifying the amplitude of ripple currents yielded by the switching patterns. The benefits of the proposed Multi-Phase Sliding Mode Control strategy involve low-switching...
For isolated DC-DC power converters, the inter-winding parasitic capacitance of the transformer is usually one of the main paths for common-mode (CM) noise. In order to simplify the CM noise analysis, this paper proposes a two-capacitor transformer winding capacitance model. The model is derived based on general conditions so it can be applied to different isolated converter topologies. A measurement...
This paper presents a novel three-phase high-frequency isolated DC-DC converter topology for offshore wind energy systems. The primary side of the converter consists of three half-bridge legs connected to three single-phase star-connected transformers. Each transformer secondary has a full-bridge rectifier and their outputs are connected in series. Constant frequency phase-shift modulation scheme...
Step-up dc-dc converters are used to boost the voltage level of the input to a higher output level. Despite of its features such as simplicity of implementation, the fundamental boost dc-dc converter has shortcomings such as low boost ability and low power density. With these limitations, researches on new voltage boosting techniques are inevitable for various power converter applications. This can...
A new galvanically isolated DC-DC converter has been presented in this paper. The proposed topology is based on the quasi-switched-boost impedance network. It not only includes all positive characteristics of previous converters including continuous input current, high boost ability and high efficiency, but also has the prominent features of less passive elements utilization, small size and light...
A multilevel soft-switching DC-DC converter with only one resonant cell for medium voltage conversion is proposed in this paper. Two control strategies for the converter are analyzed and compared. For the proposed converter, all dc capacitors can achieve voltage self-balanced under open loop control. All switches and diodes operate in soft-switching condition without sacrificing reliability. Finally,...
The Series-Resonant dc-dc converter (SRC) is widely used in several application and it became very popular in Smart Transformer application. In this application, fault tolerance is a highly desired feature and it is obtained through redundancy. This paper proposes a reconfiguration scheme for the SRC for the case of failure in one semiconductor, which could drastically reduce the need of redundancy...
This paper investigates an optimum control strategy for an isolated dual-active-bridge DC/DC converter based on MMC (Modular Multilevel Converter) technology. The control goal is to achieve minimal current magnitude for given power transfer and to provide fast control for full positive and negative power range. The control strategy is derived in the rotating dq frame. The optimal operation is achieved...
In this paper, five non-isolated bi-directional dc-dc converter topologies are analylized, demonstrated and design for the purpose of the renewable energy generation plants. These converters are: non-isolated bi-directional buck converter (NBBC), non-isolated bi-directional boost converter (NBOC), non-isolated bi-directional fly back converter (NBFC), non-isolated bi-directional CUK converter (NBCC)...
Power electronic converters play an important role in integrating renewable energy sources in to the electrical grid. A power conditioning unit (PCU) which comprises of different power electronic converters is essential to process the power of renewable energy sources and make it useable for stand-alone or grid-tied application. DC-DC converters are used in the primary stage of PCU to step up the...
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