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This paper describes selected issues concerning realization of energy storage system (ESS) designed to operate in power distribution system. This paper presents a modular approach of 300 kVA power converter operating with superconducting magnetic energy storage (SMES), which gives high dynamics together with high power and suitable capability for instantaneous energy storage. Analysis and simulation...
A multiple drives solar-pumping system is presented in this paper. The system is based on a singlestage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to obtain maximum power from the PV system and a standard indirect vector control strategy is used to regulate the machines currents. Moreover...
An improved modulation algorithm is proposed for three-phase face-to-face topology. The algorithm could make the face-to-face dc transformer use 1: 1 ac transformer or omit ac transformer in a wide variable ratio range to reducing the volume of the system. The simulation in MATLAB/Simulink validates the proposed algorithm.
This paper is concerned with modification of the One Cycle Controller for DCM Boost high quality rectifier. With the proposed control circuit the boost converter can attain a near unity power factor and near zero total harmonic distortion. This paper presents the theoretical analysis, simulation and experimental results.
This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation...
This paper proposes an analytical spectral calculation method based on 3-D Fourier integral to obtain accurate spectra of both output voltage and input current of a scalar modulated matrix converter. The matrix converter (MC) is a direct AC-AC power converter without an intermediate DC link; three-phase output is synthesized by three-phase input through nine bidirectional switches. At present, there...
State-of-the-art modulation techniques, such as space-vector modulation for the generation of three-phase alternating current, result in strong peaks in the output spectrum at the switching frequency and its harmonics. We present a space-vector implementation of a novel control scheme and modulator for commercial electric vehicle inverters, that freely shapes the spectrum of the switching distortion...
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...
This paper presents a new modulation concept for three-to-single-phase direct AC/AC modular multi-level converter-based railway interties. The concept minimizes the inherent harmonic coupling between the two grid sides and is therefore particularly suited to operation at very low cell numbers and switching frequencies. Moreover, it facilitates the use of specific modulation methods, such as optimized...
This paper concerns the application of three-level neutral point clamped (NPC) voltage source inverter (VSI) to electrical energy conversion of the photovoltaic (PV) power plant. The grid-connected 3-phase NPC inverter is powered via the split DC-link composed of the capacitive divider (Fig. 1). It enables the usage of two DC-buses independently which can be supplied by the separated boost-type DC-DC...
A new single-stage three-phase resonant ac-dc matrix-based converter is proposed. It uses a new modulation scheme designed for use with a tuned LCL resonant network that achieves unity power factor at both network ports, which leads to reduction in rms bridge currents and conduction loss. The line-frequency phase currents are controllable by modulating the ac-side and dc-side switches according to...
In this paper a control scheme for a PMSM drive that keeps the torque ripple within predefined limits is presented. The electromagnetic torque is assumed to be proportional to i1q, which is measured by using Sigma-Delta Analog to Digital Converters (ΣΔ-ADCs) with a very high sampling rate, so the actual ripple of the torque can be obtained and controlled in an enhanced way. The measurement results...
This article is going to describe the design and implementation of a non-inverting buck-boost converter for lithium-ion battery chargers. The described modulation strategy allows to achieve a high efficiency and high power density converter. The prototype is made up of off-the-shelf components and the elaborated current predictive control algorithm avoids the use of a current sensor. Only voltage...
A dual active bridge (DAB) dc-dc converter has a limited soft-switching range and high circulating current with the conventional phase shift modulation (PSM) when a voltage variation occurs in the input/output voltage. To overcome these issues, single pulse-width modulation (SPWM) and dual pulse-width modulation (DPWM) were proposed and combined into one modulation strategy called combined pulse-width...
Medium voltage grids are a suitable selection for the connection of high power applications. However, for certain applications, such as PV energy conversion systems or fast charging stations for PEVs, the DC voltages are limited to be below 1000 V, making difficult their connection to such grids without the use of a step-up transformer. Multilevel converters allow the grid connection of such DC loads,...
The increasing number of renewable energy sources and their integration into the medium voltage grid leads to an increasing interest in multilevel structures for the interfacing power electronic converters. A feasible topology for MV applications is the Stacked Multicell Converter (SMC) offering a modular structure and several voltage levels. A robust control, current limiting strategies under grid...
In this paper, a drive scheme generating 24-sided polygonal voltage space vector structure using an inverter topology with single DC source is proposed. A 24-sided structure eliminates dominant low order phase voltage harmonics including and up to seventeenth and nineteenth orders throughout the speed range including step operation. The power circuit has a two-level inverter and two low voltage cascaded...
The voltage balancing of the dc-link capacitors in an electric drive system with five-level neutral-point-clamped converters is investigated in this paper. A properly modified space-vector-modulation technique is utilized in combination with a multilevel dc/dc converter for controlling the capacitor voltages. An advanced algorithm has been developed for reducing the losses of the electric drive system...
PFC converters are widely used in industrial drive systems. The modulation scheme and the topology of the converter have a considerable impact not only on the switching losses, but also on the volume of the passive components, i.e. the EMI filter (CM and DM) and the dC link capacitors. In order to evaluate this impact, different modulation schemes for 2L and 3L topologies are analysed in this paper...
In this paper, Finite Control Set Model Predictive Control (FCS-MPC) is used to select the optimal switching sequence when synthesizing a reference space vector for a Three-Level Neutral Point Clamped inverter. The cost function is designed to ensure the selection of a switching sequence which balances the neutral point and keeps switching losses low. Simulations and experimental results prove the...
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