This study compares a three‐phase three‐level voltage source inverter with an intermediate dc–dc boost converter and quasi‐Z‐source in terms of passive elements values dimensions, semiconductor stresses, overall efficiency. A comparative analysis was conducted relative parameters to evaluate for any application. The equations obtained were confirmed by simulation experimental setup. Field application has been discussed.

Shoot-through control methods for qZSI-based dc/dc converters are presented and studied. The major goal was to increase efficiency. A new modulation technique, pulse width (PWM) with shifted shoot-through, is compared the conventional PWM shoot-through method. method reduces switching frequency of bottom side transistors inherently features partial soft switching. Previous studies have shown that biggest drawback unequal frequencies transistors. One solution problem could be signal swapping...

This paper discusses realization possibilities of the buck mode in novel magnetically integrated quasi-Z-source series resonant converter (qZSSRC) with secondary resonance. Our aim was to achieve higher power conversion efficiency at different levels and dc voltage gains converter. The phase-shift modulation (PSM) comprehensively compared asymmetrical pulsewidth (PWM). Both control techniques were evaluated for case discontinuous current through network, which made their more challenging....

The aim of the presented investigation is to explore time gap between an anomaly appearance in continuously measured parameters device and a failure, related end remaining resource device-critical component. In this investigation, we propose recurrent neural network model series healthy detect anomalies by comparing predicted values with ones actually measured. An experimental was performed on SCADA estimates received from different wind turbines failures. A used predict temperature gearbox....

This paper presents a novel quasi-Z-source halfbridge galvanically isolated DC-DC converter intended for the photovoltaic applications. The topology could be envisioned as an alternative to boost half-bridge but benefit of its symmetric structure reduces threat transformer saturation due dc flux. proposed features continuous input current and used either with one or two voltage sources.

This paper proposes a novel step-up DC/DC converter with galvanic isolation - the quasi-Z-source inverter (qZSI) based and discusses three different shoot-through PWM control methods suitable for this topology. The proposed is meant applications where wide range of voltage gain demanded, e.g. renewable energy sources (fuel cells, photovoltaic cells), in telecom, aerospace some other applications. For verification theoretical assumptions prototype was assembled tested. Experimental waveforms...

This paper presents a new bi-directional DC/DC converter for supercapacitor interfacing in high-power applications. The acts as VSI-based step-down during the charging mode and qZSI-based step-up energy recovery mode. To provide voltage matching galvanic isolation medium frequency transformer was implemented. ensure higher boost of SC discharge qZSI with two-stage quasi-Z-source (qZS) network introduced. analyzes discusses operation mostly concentrating on (boost) qZS-network is analyzed...

This paper presents some design considerations for magnetically coupled inductors in buck-boost converters distributed power generation. As compared to the conventional approach, proposed integrated magnetic structure with enables reduction core loss, size, winding losses and number of turns. discusses rough simple inductor achieve desired objectives. The methodology selection inductance, geometry, turns, air gap isolation is described. In addition, general operation principles conditions...

This paper presents a new step-up DC/DC converter topology. The is intended for applications that require high gain of the input voltage and galvanic isolation, i.e. power conditioning systems alternative energy sources such as fuel cells. operation principle explained by help steady state analysis. Simulation results are presented analyzed. Finally, experimental provided modification possibility proposed discussed.

Quasi-Z-source DC-DC converters have attracted research interest due to their numerous advantages in emerging applications. However, they suffer from relatively low efficiency. This paper presents semiconductor loss breakdown of the quasi-Z-source converter show that conduction losses semiconductors contribute most overall losses. Synchronous rectification realized through replacement diodes with N-channel MOSFETs was proposed improve efficiency prior works. Our detailed experimental study...

Solutions for a family of the novel three-level neutral-point-clamped (NPC) inductor-capacitor-capacitor-transformer (LCCT)-derived three-phase inverters are described and compared. Component design guidelines steady state analysis, current voltage waveforms given. The authors' simulation results confirm theoretical predictions. It was found that an asymmetrical NPC LCCT-derived inverter with single diode in impedance source network is most promising solution. Experimental input continuous...

Digital twins (DTs) have been implemented in various applications, including wind turbine generators (WTGs). They are used to create virtual replicas of physical turbines, which can be monitor and optimize their performance. By simulating the behavior turbines real time, DTs enable operators predict potential failures maintenance schedules, resulting increased reliability, safety, efficiency. WTGs rely on accurate speed measurements for safe efficient operation. However, sensors prone...

This paper presents simulation and experimental results of a quasi-Z-source inverter (qZSI) based bi-directional DC/DC converter for supercapacitor (SC) interfacing. The bidirectional capability provides both the charging discharging SC. During mode operates as conventional VSI performing voltage buck function, but during qZSI step-up boost function. proposed discussed was tested in operating modes - SC discharging. Theoretical assumptions are proved by PSIM verified experimentally on 500 W...

The interleaved multilevel DC-DC converters have advantages of low voltage stress the switches and diodes reduction filter size. Particularly series input parallel output (ISOP) configuration is well suited for high large current application but (ISOS) enable utilization rating in applications that require galvanic isolation. connection isolated at side also can be used higher application. While topology offers many new features, it necessitates a balance control capacitors. paper describes...

This paper provides an analytical overview of different impedance sources networks. General classification and main properties source networks their modifications are summarized presented.

Focus of this study is on a new switched-capacitor current-fed (CF) quasi-Z-source inverter (qZSI) topology, which derived from the conventional CF qZSI. Each capacitor network replaced by switching-capacitor cell built with two capacitors and three diodes. As our steady state analysis an idealized converter shows, proposed qZSI offers extended regulation region increased voltage gain. Bi-directional power transfer wide range fit requirements set for electric vehicle applications. Operation...

<p>Battery energy storage systems are becoming more and popular solution in the household applications, especially, combination with renewable sources. The bidirectional AC-DC power electronic converter have great impact to overall efficiency, size, mass reliability of system. This paper reviews literature that deals high efficiency technologies for connecting low voltage battery an AC distribution grid. Due isolated or a dedicated topology non is required. Review on single stage, two...

This paper presents a bi-directional quasi-Z-source inverter (qZSI) based DC/DC converter for supercapacitor (SC) interfacing in high power applications. In the SC charging mode proposed acts as conventional VSI step-down converter, but energy recovery it qZSI-based step-up converter. The analyzes and discusses operation of mode. analysis static model well Bode diagram are presented. Theoretical results verified by experimental on 500 W prototype

In this paper authors present a method for optimal sizing of supercapacitor (SC) energy storage system (ESS) braking recovery in tram network. The is applicable segmented networks with radial feeding topology and stationary installed traction substation. demonstrated one substation Riga public transport

Instantaneous current measurement increases the cost and size of control system in switched-mode power supplies. This paper presents first attempt to apply sensorless conjunction with a half-bridge converter. The proposed single-loop algorithm allows shaping sine-form rectifier mode by using only one voltage loop (no is needed) stabilize DC bus voltage. Mathematical equations were defined for capacitor voltages, inductor peaks, transistor conduction time during discontinuous continuous mode....

The main advantages of the interleaved multiphase DC-DC converters over single-phase are reduced current stress and output ripple. However, inductor ripple can not be only by interleaving method. integrated magnetic structure used to solve this problem also allows achieve higher power density. In paper application combination 2-phase directly coupled inversely is analyzed developed 4-phase converter compared with using separate auxiliary inductor. prototype has been built. experimental...