This paper presents the high-performance quasi-Z-source series resonant dc-dc converter as a candidate topology for photovoltaic module-level power electronics applications. The features wide input voltage and load regulation range thanks to multimode operation, i.e., when shoot-through pulse width modulation phase-shift are combined in single switching stage realize boost buck operating modes, respectively. Our experiments confirmed that proposed is capable of ensuring ripple-free 400 V...

A novel bidirectional dc-dc converter based on the quasi-Z-source (qZS) topology is presented in this paper. During battery discharge, it operates as conventional qZS full-bridge with a synchronous voltage doubler rectifier. charging, half-bridge rectifier and LC filter. relay used for reconfiguration between those two modes. The operation principle explained, design guidelines are provided. prototype nominal power of 300 W verification steady-state regulation characteristics efficiency...

This paper presents an isolated single-stage on-board electric vehicle charger without intermediate DC-link. Based on current-source topology, the converter features soft-switching in semiconductors regardless of load variation for full AC line voltage range. Moreover, it requires no external snubber or clamp circuits. The power factor correction and regulation are provided by a relatively simple phase shift modulation, while amount circulating energy is kept at minimum. distinguished its...

Residential dc microgrids and nanogrids are the emerging technology that is aimed to promote transition energy-efficient buildings provide simple, highly flexible integration of renewables, storages, loads. At same time, mass acceptance slowed down by relative immaturity technology, lack standardization general awareness about its potential. Additional efforts from multiple directions necessary this increase market attractiveness. In near-term, it likely will be connected conventional ac...

This paper presents a new grid-forming strategy for hybrid AC/DC microgrids using bidirectional virtual inertia support designed to address weak grid conditions. The stability of heavily relies on the AC mains frequency and DC-link voltage, deviations in these factors can lead undesirable outcomes such as load curtailments power system congestions blackouts. introduces unique approach that leverages enhance reliability under proposed employs buffer mitigate rapid changes voltage frequency,...

In this paper, the wear-out performance of an impedance-source photovoltaic (PV) microinverter (MI) is evaluated and improved based on two different mission profiles. The operating principle hardware implementation MI are first described. With experimental measurements a 300-W prototype system-level finite-element method simulations, electrothermal models built for most reliability-critical components, i.e., power semiconductor devices capacitors. dependence loss junction/hotspot temperature...

This paper focuses on the galvanically isolated quasi-Z-source dc-dc converter with a novel zero voltage and current switching technique. The unique feature of impedance network lies in combining buck-boost operation capability short- open-circuit immunity transistors; at same time, it can perform primary side. boundary conduction mode second inductor was used along snubber capacitors two out four transistors special control algorithm to achieve full zero-switching inverter. Simulation...

In this paper, the concept of an Optiverter is proposed as a novel class photovoltaic (PV) module level power electronics systems. Functionally, hybrid technology that combines ultrawide maximum point tracking (MPPT) voltage window PV optimizers with direct ac connectivity and inherent safety microinverters. Thanks to advanced multimode control variable dc-link shade-tolerant MPPT algorithm, ensures efficient energy harvest from in different shading scenarios. To justify superiority concept,...

This paper presents a novel soft-switching galvanically isolated buck-boost dc-dc converter as module-integrated for photovoltaic (PV) applications. It features three major operating modes: boost, normal, and buck mode. Their proper distribution over the input voltage range enables wide regulation capabilities, i.e., close to those of nonisolated power optimizers. The proposed control algorithm requires only one switching stage that performs by means reconfiguration with smooth transition...

A multiphase quasi-Z-source (qZS) dc-dc converter was proposed for distributed energy generation applications. It contains single-switch qZS isolated cells with a voltage doubler rectifier. These are connected in parallel at the input side and series output to increase dc gain. blocking capacitor isolation transformer results resonance that could be utilized soft-switching. Two design approaches were proposed: considering phase shedding dependent on without it. The former targets wide range...

PV systems are penetrating the energy generation market rapidly. system output strongly depends on environmental conditions. As a result, utilization of power electronic converters is mandatory. On other hand, most modern loads, from small to big ones, based dc, similar renewable sources generating dc. Hence, wide adoption residential dc microgrids (RDCμGs) would be trend soon, following developments in energy-efficient buildings. This paper targets for integration into RDCμGs. It considers...

Power electronics has evolved from being only present in a few applications such as variable speed drives the 1970s to becoming ubiquitous, almost every industrial application, and powering our daily life. In this ever-expanding market, power converters have become mature technology covering wide range of applications, providing solutions watts (e.g., LED drivers) gigawatts high-voltage direct current systems). Competition driven development pursuit cost reduction, increased efficiency,...

Electrification is a mega-trend in the modern economy, urged by need for more ecological and sustainable impact of new technologies, among many other merits related to process electrification. The widespread adoption renewable energy, transportation electrification, energy storage systems smart manufacturing remarkable. As result, power electronics has become critical enabling technology improving efficiency sustainability. In recent years, reliability electronic equipment been under...

Energy storage systems (ESSs) facilitate utility grid operations on various levels, which include power generation, transmission, and distribution. The benefits of these produce an overall improvement stability, security, resilience; cost reductions resulting from the need for less expensive reserve equipment; enhanced quality; customer satisfaction. In line with development technology, pricing standards, operator familiarity, ESSs' role in future will be substantial. This article summarizes...

A Maximum Power Point Tracking (MPPT) algorithm is proposed based on the assumption that a simplified three-parameter photodiode-based model can provide an excellent approximation of PV module i-v curve around its maximum power point (MPP). Procedures to obtain MPP coordinates and three parameters approximated from experimental online measurements, analytical Newton-Raphson iterative calculations are thoroughly described. Initializing as well optimizing it operate faster by identifying only...

This article presents a high gain pure sine- wave inverter based on the full-bridge dc–ac high-frequency link cycloconverter topology for telecom or general-purpose applications. The improved quasi-resonant modulation method allows reduction of ringing and turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> losses dc-side switches. is achieved with minimal energy circulation requires no multi-mode operation extra auxiliary clamping...

This article introduces a step-up/down series partial power converter (S-PPC) based on isolated current-source dc–dc topology. The proposed S-PPC exploits the most important feature of used topology, such as capability to operate with both voltage polarities in port decrease its rated power. Other advantages include soft switching entire operating range and low current stress semiconductor components even at very voltage. In addition, provides protection soft-start capabilities due...

The focus is on partial power converters interfacing photovoltaic strings in dc microgrids. Step-up/down were considered for providing the lowest active processing. This study considers three Si-based modules commonly used residential applications: 54-, 60-, and 66-cell. Different configurations of are analyzed to find at what voltages most energy generated hot cold climates. Combining these results with operating voltage range a droop-controlled microgrid yields design requirements...

Step-up/down partial power converters (PPCs) offer lower partiality and increased efficiency, as evidenced by the literature. However, their operation near zero partiality, i.e., with same source load voltage, is challenging if converter maintains modulation technique. This because capacitor does not have enough energy to provide required voltage gain when a PPC operates at series port voltage. renders step-up/down unsuitable for practical use in photovoltaic (PV) applications, resulting...

Reliable data on residential power generation and consumption is vital for effectively integrating renewable energy sources. This particularly important in the Baltic countries, where climate variability significantly impacts production consumption. Such high-resolution usage beneficial various applications, including planning, demand response, behavior analysis, forecasting. The dataset presented this study contains one year (2023) of photovoltaic (PV) meter flow collected at ten-second...

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....