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This paper presents the design and optimization of an isolated DC-DC converter that could be potentially selected for advanced multilevel topologies for offshore wind turbine applications. The superior properties of Silicon Carbide material in terms of switching speed, voltage withstand and efficiency provides the possibility to develop a highly optimized DC-DC converter.
In this manuscript a new interleaved topology based on the three-port boost converter is presented. A new modulation scheme that works for the interleaved and non-interleaved 3-port boost converters is proposed as well. Models for interleaved and non-interleaved converters that describe the behavior in any of the different working modes are developed. These models can be easily averaged in order to...
A transformerless multicellular dc-dc converter has been newly proposed. The capacitively isolated dc-dc cell converters have been applied to develop the multicellular converter without using high frequency transformers. The high voltage transformation ratio is achieved by the ISOP (Input Series Output Parallel) connection topology of the cell converters and the realization of the highly efficient...
Electric vehicles and hybrid electric vehicles are seen as the future of the automotive industry with its aim to replace the conventional combustion engine vehicle. The conventional Multi-Input Multi-Output topology used in the electric and hybrid electric vehicle applications. The weaknesses of this topology are the complexity of circuit which increases the size of the converter and overall cost...
ISOV (Input Series Output Parallel) modular DAB (Dual Active Bridge) converter based topologies have been mostly considered for solid-state transformer (SST) based power substation design, involving multilevel converters at the medium-voltage side. As DAB converter is one of the core components of this topology, an important question to address is thus the freewheeling currents of DAB which increases...
Energy Router has received lots of attention in a great amount of applications due to its powerful functionality and great flexibility. Capacitor charging strategy plays a key role in the operation of energy router. The focus is on the submodule applied in the hybrid multilevel energy router in this paper. The submodule is constituted of a three-level rectifier and an isolated DC-DC converter in which...
This paper proposes topology of a magnetically coupled residential micro-grid consisting of a multi-port dc-dc converter and a single phase grid-connected bi-directional inverter. It integrates photovoltaic (PV) and fuel cell energies to supply the residential load via a common high-voltage dc bus linked to a single phase bidirectional inverter. A battery is used to store the surplus energy of the...
The Power Conversion Module (PCM) plays an important role in a shipboard MVDC system which transforms power from a medium-voltage dc to a low voltage dc bus. In this paper, an isolated modular multilevel dc-dc converter (iM2DC) and a dual active bridge (DAB) converter are designed for a 300 kW PCM converter respectively. The total device rating, passive component size, and conversion efficiency of...
A novel isolated high step-up gain DC-DC conversion system for HVDC grid-connected PV power generation applications is proposed in this paper. The proposed system has a distributed MPPT and centralized step-up DC-DC configuration. By employing distributed MPPT converter, high power losses caused by partial shading of the PV arrays can be reduced significantly. Modular scheme is adopted for the centralized...
A microgrid is defined as a local electric power distribution system with diverse distributed generation (DG), energy storage systems, and loads, which can operate as a part of the distribution system or when needed can operate in an islanded mode. Energy storage systems play a key role in improving security, stability, and power quality of the microgrid. During grid-connected mode, these storage...
In order to solve the inconsistency of the battery pack in the traditional battery energy storage system, a new type of battery module energy storage system topology and control strategy based on flexible grouping is proposed——Modular Battery Energy Storage System Based on One integrated Primary multi-secondaries transformer. Different from commonly used full-power control mode, the part-power control...
This paper presents a voltage regulated step up Marx DC-DC converter suitable for HVDC offshore wind farm applications. This configuration has the capability to generate a variable high voltage adding controllability to the standard Marx converter with a fixed gain. For voltage control, an auxiliary controlled buck-boost converter was combined with the Marx converter to regulate the output voltage...
A Z-source boost dc-dc converter along with a multilevel inverter is proposed. In this work, the modified converter with conventional Z-source network has high voltage gain compared to the traditional boost dc-dc converters. It gives a common ground between the dc supply source and load output. The impedance network acts as a bridge connecting the source and the converter. It does not require any...
Solar electrical energy generation and its conversion techniques gain more attention because Photo Voltaic (PV) power generation system is more attractive due to its advantages among all the RESs (Renewable Energy Sources). In this paper, Isolated SEPIC(Single-Ended Primary-Inductance Converter)converter fed grid connected Multilevel Inverter is proposed. SEPIC converter is a buck-boost derived topology...
This paper introduces a high-power-density low-profile dc-dc converter for cellphone battery charging applications. The converter delivers 40 W across a 4:1 input voltage range with a nominal input voltage of 12 V and a nominal output voltage of 4 V. The PCB area of the converter is limited to 80 mm2 and the component height is limited to 1 mm. Three alternative topologies — a zero-voltage switching...
The dc-dc conversion will play an important role in multi-terminal dc networks and dc grids. This paper presents two isolated resonant modular multilevel converters (IRMMCs) to fulfill the large step-ratio conversion for medium voltage dc (MVDC) networks. The conventional resonant modular multilevel converters (RMMCs) suffer the common problems of non-isolation and high current stress, which are solved...
This paper proposes a DC-DC modular multilevel converter (MMC) topology for MVDC and HVDC applications that does not require ac transformers or coupled inductors. The DC-DC MMC comprises two dc-dc subconverters that are interlinked in a symmetric manner, whereby the modulated ac voltages remain isolated from the dc terminals. This enables a substantial reduction in converter size, weight, capital...
We present a dc-dc resonant converter structure that has a pair of loosely coupled inductors in place of one filter inductor and two resonant inductors. Not only the number of inductors is reduced by one, but in this arrangment the transformer provides galvanic isolation and requires a sub-unity coupling coefficient which eases the implementation, especially at high switching frequencies. Various...
Supercapacitors (SCs) are also known as Electric Double-layer Capacitor (ELDC) or Ultracapacitors. In the high voltage applications, the supercapacitors are connected in series, so that the voltage imbalance will occur because the SCs are not identical. This different parameters of the cells caused by many factors for instance the internal parameters of supercapacitors (Capacitance, Equivalent Series...
In this paper, a novel topology of the high step-up multiphase galvanically isolated impedance-source DC-DC converter is proposed. It was derived by the input-parallel-output-parallel cascading of the asymmetrical quasi-Z-source half-bridge cells. The operating principle of the converter is explained by the steady state analysis. It was also demonstrated how the input current ripple of the converter...
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