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The modular multilevel converter (MMC) has become a potential candidate for medium/high-power applications including high-voltage direct current (HVDC) transmission, adjustable speed drive, and static var compensation systems. One of the technical challenges associated with the control of an MMC is the choice of pulse width modulation (PWM) strategy along with a submodule (SM) capacitor voltage balancing...
In this paper a new AC/DC unidirectional switching cell with nine voltage levels is proposed. It is called Stacked-Flying-Capacitors-Coupled-Inductors (SFC2I) and can be connected between an AC current source and a DC voltage source. The novelty of 9L-SFC2I topology is based on two cascaded stages that work at different currents, different voltage and different switching frequency. The first stage...
This paper presents a novel DC-AC inverter based on a high frequency power electronic transformer. It makes use of an adapted push-pull converter on the primary side of the transformer to apply a high frequency alternating voltage. This keeps the transformer flux low and transformer size small, reducing the cost of materials but at the same time keeping the power density high. The secondary side is...
In this paper, an active power filter (APF) based on a modified one-cycle control is proposed. This control method can be applied in a three-level three-phase four-wire system. By adding an additional current sensor to detect the fundamental component of the output current, the proposed APF is capable of compensating harmonic components independently from the VAR compensation so that the capacity...
The current project was originally initiated by the marine industry, where bulky low-frequency transformers have become a growing problem and the need for a more flexible solution is growing. The active power electronic transformer (APET) is likely to be the most suitable candidate. Modular power electronic building blocks (PEBB) enable complex power electronics systems to be built and reconfigured...
Different control loops employed in regulating deck converter outputs may have an effect on the output impedance of the converter. In this manuscript, the effect of the inner-current loop on the output impedance of a peak current-mode controlled PWM dc-dc converter with the outer-voltage loop open is investigated. Closed-loop output impedance including feed-forward gains with inner-current loop closed...
This paper deals with the performance assessment of different permanent magnet motor drives topologies for Starter/Generator systems in aircraft applications. The comparison focuses on power electronics topologies, evaluating, by means of simulations performed with Matlab/Simulink and Plexim Plecs, some relevant key points such as efficiency, losses and motor current harmonic distortion. For all the...
The variation of the temperature in semiconductors, caused by the load profile, results in the long term in material fatigue. A distinction can be made between the average temperature and the temperature swing, where the temperature swing has a significant effect on the lifetime of a semiconductor. Therefore, the auxiliary-pole topology is proposed to reduce the temperature swing of the MOSFETs in...
This paper presents an industrial platform for the testing of power converters for variable speed electrical drives at the end of the production line. For this purpose, the converter under test does not supply a real electrical machine but another power electric converter acting as a load emulator that regenerates the power into the grid. The testing platform is intended to emulate all necessary tests...
Rapidly increasing penetration of renewable energy sources into conventional power distribution systems has led to the rise in power electronic converter dominated power distribution systems. However, it has been a well established that the presence of tightly regulated point-of-load (POL) converters in the power distribution system, which act as Constant Power Loads (CPLs), cause serious stability...
This paper presents the development of the power electronics needed for the interaction between the electrical generator of a wind turbine and an isolated ac micro grid. In this system there are basically two types of receptors for the energy produced by the wind turbine, which are the loads connected to the isolated micro grid and the batteries used to store energy. There are basically two states...
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...
The main objective of this paper is to study and analyze the power supply stage of a series-series (SS) fixed-frequency inductive power transfer (IPT) system, in order to suggest effective soft switching techniques to improve its performance. Because of the characteristics of the system, zero voltage switching (ZVS) operation was used and three control strategies were compared: phase-shift (PS) control,...
The increasing installation of distributed energy resources results in massive challenges related to the planning and operation of the power systems. Through intelligent control on system but also on component level with advanced functions the existing electricity supply infrastructure can be more efficiently used without the need to install additional distribution lines. Such a Smart Gird allows...
Grid integration of multiple renewable energy sources using a power electronic transformer (PET) topology is presented in this paper. A modular multilevel converter (MMC) is proposed as the power converter on the high voltage grid side to generate high frequency sinusoidal voltages. A single multi-winding high frequency transformer (HFT) interfaces different wind generators/photovoltaic arrays using...
A truly distributed and autonomous control strategy is proposed for the FREEDM System-a power electronics based distribution grid. The proposed control strategy requires no communication between and among all grid assets. By utilizing available local quantities (V, f) as a way to communicate among all connected devices, the strategy contains a novel dual droop control loops between the medium voltage...
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