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This paper presents a high-gain boost converter for an fuel cell (FC) applications. A model-based control structure based-on flatness principle for a distributed DC generation is studied. As the derived dynamic model of the converter model is nonlinear, advanced control techniques using differential flatness are applied. Utilizing the flatness property, we propose simple solutions to the system performance...
A method that can be used in the calculation of harmonic of MEDC transmission system is described in this paper. This is based on the advanced switching function model of MIDC converters in the DC side and the network topology in the AC side of MIDC. In this method, both the effect of the harmonic interaction between the AC and DC system and the harmonic transfer among subsystems of MIDC are considered...
This paper addresses the steady-state and dynamic modeling of a three-level, neutral-point-clamped (NPC) voltage source converter (VSC) with active front-end (AFE) in a commercial 2.5 MW variable speed motor drive (VSD). The AFE of the modeled VSD adopts the selective harmonic elimination SHE-PWM technique with the optimization of inverter power capacity and power source quality for a wide-range VSD...
In this paper, a high gain single-stage buck-boost grid-connected system is proposed. The proposed system consists of a high voltage gain - high efficiency - switched inductor buck-boost converter (SIBBC) and a folded cascade H-bridge inverter. The proposed converter switch is derived with a sinusoidal modulation, so that the converter output voltage is a rectified sine wave which requires only a...
Variable linear or nonlinear loads are necessary for testing medium voltage (MV) high power AC power supplies. Generally, those AC power supplies require performance validation, burn-in, and/or life-time testing under different load conditions, defined by the end-user or standards for the given applications. For this purpose, this paper presents a multilevel converter-based AC regenerative electronic...
One of the most important aims in the electronic industry is the reduction of the size of the magnetic components, since it allows the improvement on the power density and the decrease in the cost of the power electronics equipment. In this paper, the chopped sinusoid peak current control scheme in critical conduction mode (CRM) PFC converter is proposed to reduce the inductance and the peak inductor...
A new cell voltage equalizer topology for future plug-in hybrid electric vehicles (PHEV) or renewable energy storage has been proposed in this paper. This topology has fewer components compared to the conventional topologies found in the literatures, and therefore, it could reduce cost and fabrication complexity. This new circuit is based on a time shared fly-back converter, and any number of series...
The control for a switched reluctance generator (SRG) with three-level power converter to increase output power is presented in this paper. First, the operation conditions and key factors to enhance output power of SRG are proposed. Then a three-level power converter with intermediate freewheeling boosts the magnetizing current and the average current in generation freewheeling region. Accordingly,...
This paper presents an adaptive non-linear piezoelectric energy harvester that uses the synchronous electric charge extraction (SECE) technique with an optimized flyback converter power stage. The SECE flyback converter is designed after a thorough analysis of power stage and control power losses and then tested with both synchronous and asynchronous power stage switching. Experimental results with...
The capacitor voltage balancing is the main technical challenge of a multi-level Flying Capacitor Converter (FCC). This paper proposes a Space Vector Modulation (SVM)-based voltage balancing strategy that takes the advantage of redundant switching states of an n-level FCC to counteract the voltage drift/imbalance. A cost function minimization approach is proposed to choose the proper redundant switching...
This paper presents a buck converter augmented with additional energy paths that enable a near null response to load transients. Fundamental performance limits, such as slew-rate limits, are overcome resulting in increased bandwidth with a response that is faster than previously established “minimum time” or “time optimal” control of conventional buck converters. An energy-based method is presented...
Dc-capacitor voltage drift phenomenon is the main technical issue of an n-level (n>;3) Diode-Clamped Converter (DCC). This paper presents a predictive current control strategy for a three-phase five-level DCC which enables simultaneous control of ac-side currents and balance of capacitor voltages. The paper derives a discrete-time dynamic model of a five-level DCC. Based on the derived model, a...
In this paper, a buck resonant voltage divider (BRVD) with bidirectional operation considered is presented with the fixed switching frequency all over the load range, which can be used as the first stage of the bus converter. The proposed buck resonant voltage divider with open loop control can obtain about half of the output voltage created from the resonant voltage divider. Above all, all switches...
This paper presents an interleaved active-clamping zero-voltage-switching (ZVS) forward-flyback converter without output choke. The presented topology has two active-clamping circuits with two separated transformers. In this converter the main switch of any converter also acts as auxiliary switch for the other one, so only two switches are required and there is no need to additional switches to achieve...
This paper proposes an interleaved active-clamping zero-voltage-switching (ZVS) converter using a single magnetic core. The presented topology is composed of an active-clamping forward converter parallel with an active-clamping flyback converter. The main switch of any converter also acts as auxiliary switch for the other one, so only two switches are required and there is no need to additional switches...
Grid interaction of DG units with a novel hybrid flying capacitor multicell converter which is suitable for hybrid systems, is presented in this paper. Multicell inverters have important advantages which make them a flexible solution for medium voltage/high power applications such as: lower rating of switches and lower output voltage THD. Proposed configuration of multicell inverter requires less...
This paper offers a new converter for switched reluctance motor (SRM) drive which uses one switch in each phase. One switch for each phase is the least number of switches among the converters used in the switch reluctance motor drive. Also, the proposed converter enjoy from an important characteristic which makes it suitable for high speed drive applications. This is due to the fast phase current...
In this paper a sliding mode controller is proposed for a continuous current mode buck converter. High proficiency and simplicity of implementation are the most significant features of the proposed controller. To fix the switching frequency of the converter, the sign function which generates the discontinuous control law in sliding mode controller, is replaced with a hysteresis relay whose cycle is...
Voltage source converter based DSTATCOM has been accepted as the most preferred solution for reactive power management in distribution power networks which plays a vital role in improving power quality, correcting power factor and maintaining constant distribution voltages. However, the quality of DSTATCOM output voltage and current itself, such as injected harmonics and Total Harmonic Distortion...
In this paper a digital voltage-mode controller design methodology is proposed for the fourth order split inductor converter load voltage regulation. The salient features of the split-inductor converter are compared with the conventional SEPIC converter and then discrete-time mathematical models are established. Digital single-loop voltage-mode controller is designed using direct digital design approach...
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