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This paper presents a multifunctional bidirectional converter. The proposed converter works as a grid-tied inverter, injecting power coming from a PV subsystem to the AC mains in the daytime hours, but also supplies energy to a LED-based street lighting system at night. The topology is based on the integration of two Flyback converters thus allowing the desired bidirectional energy flux. Each Flyback...
The paper analyzes the bidirectional power exchange achieved with a multiphase DC/DC converter and the possibilities to switch this type of converter between boost and buck operation modes. In particular, the topology and the waveforms of a two-phase DC/DC bidirectional converter with coupled inductances are presented. The currents ripples for two converters sub types, with uncoupled and coupled inductances,...
Asymmetrical cascaded multilevel converters can generate more number of voltage levels for the same number of switching devices. Binary, Trinary and other different forms are available in literature. This paper has critically investigated such converters from the point of view of optimizing the number of levels. A mathematical tool to analyze the possibility of any asymmetric ratio for various three-phase...
This paper proposes a high step-up, transformerless, dc/dc converter suitable for applications where high efficiency at low power throughput is required. The proposed converter achieves high step-up dc/dc conversion through a resonant LC tank and realizes high-efficiency operation via the softswitching enabled by this resonant network. Flat efficiency is obtained via discontinuous conduction mode...
Modular multilevel converter (MMC) is a promising multilevel topology for high-voltage applications that has been developed in recent years. The control of MMCs has been analyzed in detail in many papers, showing that the converter capacitors can be kept charged and balanced by controlling the circulating current of each leg. The set-point signal of the circulating current is probably the most difficult...
Power quality and reliability are inherent characteristics of the cascaded multilevel converters. However, in some converters, efforts should be made to ensure the durability and reliability of the equipment. This is the case of the single-phase current source cascaded inverter (SPCS-CI) in which, due to possible differences in the DC input current to each inverter of the system, it will be necessary...
This paper deals with the control design for an aircraft electric starter-generator system that utilizes recent advances in modern power electronics allowing the use of novel machine types together with the introduction of controlled power electronics into the main path of energy flow. The paper describes the developed system and focuses on control design including flux weakening control of high-speed...
This paper presents a control strategy applied to a three-phase Cascaded Cell Multilevel Inverter (CCMLI) feeded by photovoltaic panels and connected to power grid, able to compensate imbalances between cells and phases. The technique consists in indirectly obtaining common mode voltage and adding a control loop power control in the conventional structure. Following in this analysis, it will be presented...
In various control problems for infinite-dimensional systems (see, e.g., [1], [2], [3], [4], [7]) one can found usefulness of Sylvester type operator equations. The aim of the paper is to popularize the implemented semigroup framework (e.g. [8], [5], [6]) by showing how it helps to deal with the infinite-dimensional algebraic Sylvester equation both in differential (DSE) and in the algebraic (ASE)...
The recently proposed Hexverter topology belongs to the group of modular multilevel direct AC/AC converters. For its operation, a so-called adjacent compensating power is essential. This paper introduces a new method for composing the adjacent compensating power, which optimises the efficiency. The importance of the adjacent compensating power for branch energy control is shown and the differences...
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...
A new Hybrid Boosting Converter(HBC) is proposed in this paper. It combines the advantages of regulation capability of traditional inductor based DC-DC converters and gain boosting ability of switched capacitor converters. It is capable of boosting the input voltage to ten times with single active switch and one inductor while maintaining high efficiency. In addition, the switch stress is low and...
Modular multilevel converters offer many advantages for high-voltage and high-power applications. A recently proposed modular multilevel direct AC/AC converter is the so-called Hexverter. This paper presents a method to control the energy stored in the branches of the Hexverter topology. The control concept is described and possible degrees of freedom for the branch energy control are analysed analytically...
In the paper optimal control problems of Lagrange and Bolza type governed by Dirichlet problem are considered. The main results are existence and continuous dependence of solution to Dirichlet problem. These results are then apply in the proof of the existence of optimal control problem.
The combined level set and phase field rather than classical level set approach is used in the paper to analyze and solve numerically the topology optimization problem for system governed by the variational inequalities. Classical level set method allows to evolve a given sharp interface but is not capable to generate holes unless the topological derivative is used. The phase field method indicates...
An isolated inverter based on differential output is proposed. The inverter is composed by two phase-shifted full bridges (PSFB) converters. The two PSFBs share a common leg which works as the lagging one on the primary side. Two current-doubler synchronous rectifiers (CDR) are on the secondary side and constitute differential structure. With the same DC bias and phase-reversed AC components in the...
This paper presents a design framework to select the best topology and conversion ratio of operation for series-parallel capacitive buck/boost DC-DC converters. The framework models all converter families providing design insights and tradeoffs among the various topologies. We select the 10 optimal topologies that always performs better than any of the 96 permutations that are possible for series-parallel...
The authors have proposed a fair solution to optimal rate adaptation. The problem has been described in terms of the objective function, decision variables and constraints. Furthermore, using this problem definition, a rate adaptation heuristic was developed and divided into two sub- problems; part one requires finding the optimal rate allocation within the network, part two continues by finding a...
This work introduces a new Multiple-Input Multiple-Output Modular Multilevel dc-dc Converter (MIMO-MMC). The proposed topology has a bidirectional structure and may be utilized in both low and high power applications ranging from approximately 100W to 10MW. The modular structure of the MIMO-MMC enables efficient component utilization through module voltage and current sharing capabilities. The topology...
In this study, a novel interleaved CLL resonant converter with a full bridge rectifier is analyzed. Series connected transformers in the secondary side provide to share the power in each port and reduce the voltage stresses on the switches compared to the parallel connected transformers. The presented converter topology is explored for wide input and output voltage variation without frequency changes...
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