Grid-connected converters exposed to weak grid conditions and severe fault events are at risk of losing synchronism with the external neighboring converters. This predicament has led a growing interest in analyzing synchronization mechanism developing models tools for predicting transient stability grid-connected paper presents thorough review developed methods that describe phenomena instability under symmetrical faults. These compared where advantages disadvantages each method carefully...

With an increasing capacity in the converter-based generation to modern power system, a growing demand for such systems be more grid-friendly has emerged. Consequently, grid-forming converters have been proposed as promising solution they are compatible with conventional synchronous-machine-based system. However, most research focuses on control during normal operating conditions without considering fundamental distinction between converter and synchronous machine when its short-circuit...

Capacitors are widely used in dc links of power electronic converters to balance power, suppress voltage ripple, and store short-term energy. Condition monitoring (CM) dc-link capacitors has great significance enhancing the reliability converter systems. Over past few years, many efforts have been made realize CM capacitors. This article gives an overview a comprehensive comparative evaluation them with emphasis on application objectives, implementation methods, accuracy when being used....

The electrification of the transportation sector is moving on at a fast pace. All car manufacturers have strong programs to electrify their fleet fulfill demands society and customers by offering carbon-neutral technologies bring goods persons from one location another. Power electronics technology is, in this evolution, essential also rapid development technology-wise. Some introduced are quite mature, systems designed must high reliability as they can be complicated an electrical...

Electrolytic capacitor with a DC-side inductor is typical DC-link filtering configuration in grid-connected diode rectified Adjustable Speed Drives (ASDs).The criteria to size the filter are mainly from aspects of stability and power quality.Nevertheless, reliability also an essential performance factor be considered, which depends on both component inherent capability operational conditions (e.g., electro-thermal stresses) field operation.Nowadays, unbalanced voltage has most frequent...

In an ac microgrid, a common frequency exists for coordinating active power sharing among droop-controlled sources. A is absent in dc leaving only the source voltages sharing. That causes error and poorer voltage regulation microgrids, which most cases, are solved by secondary control layer reinforced extensive communication network. To avoid such infrastructure its accompanied complications, this paper proposes alternative droop scheme low-voltage microgrid with both primary merged. The...

In a classical ac microgrid (MG), common frequency exists for coordinating active power sharing among droop-controlled sources. Like the frequency-droop method, voltage-based droop approach has been employed to control converters in low voltage direct current (LVDC) MGs. However, variation due gains and line resistances causes poor regulation dc MG, which most cases are solved by secondary controller using communication network. To avoid such an infrastructure its accompanied complications,...

Increased penetration of converter-based power generation has enforced system operators to require ancillary services from distributed in order support the grid and improve stability reliability. Recent next-generation codes asymmetrical current provision during unbalanced faults for optimal voltage support. To address this, based on highly used flexible positive- negative-sequence control method reference generation, this paper presents a general strategy fault control, where direct...

The reliable design, planning, and operation of power systems are paramount importance for providing services to customers. This article reviews the different aspects system reliability, ranging from planning operation. Standard benchmarks employed studies reviewed according nearly 2,500 IEEE journal papers 1986 early 2019. Our overview provides pros cons existing test systems, implying lack appropriate future studies, including renewable resources modern technologies. Furthermore, this...

This paper investigates and evaluates the performance of a single-phase split-source inverter (SSI), where an alternative unidirectional dc-ac configuration is used. Such utilized in order to use two common-cathode diodes single device instead using separate diodes, resulting minimum parasitic inductance commutation paths. In this paper, analysis modulation SSI discussed, low-frequency component dc side introduced. Moreover, features behind employing triangular, trailing-edge sawtooth,...

This paper proposes a new control scheme to eliminate the 3rd harmonic in output currents of grid-following inverters under unbalanced grid conditions. Unbalanced grids adversely affect performance due oscillations appearing on DC-link voltage with frequency twice line frequency. The is based instantaneous active reactive (IARC) technique its advantages over other existing methods. However, presence severe asymmetrical distortions inverter main challenge IARC method, which impairs power...

Due to the inherent double-frequency (2f0) ripple in single-stage single-phase photovoltaic grid-connected inverters, maximum power point tracking (MPPT) will inevitably be affected. To improve MPPT performances, a passive LC decoupling circuit with robust second-order sliding-mode control (SOSMC) is thus proposed this article. With path, pulsation on dc link effectively cancelled out. Thus, accuracy significantly enhanced, and utilization of small dc-link capacitor becomes possible....

Renewable power-to-hydrogen (P2H) technology is one of the most promising solutions for fulfilling increasing global demand hydrogen and to buffer large-scale, fluctuating renewable energies. The high-power, high-current ac/dc converter plays a crucial role in P2H facilities, transforming medium-voltage (MV) ac power large dc current supply electrolyzers. This work introduces general requirements, overviews several topologies systems. performances different are evaluated compared from...

Safety enhancement for lithium-ion batteries (LIBs) has received a lot of attention from academic and industrial fields. However, there is lack overview the perspective application power electronics (PEs) in systems. This article gives an PE-based safety technologies LIBs, mainly focusing on battery management. It introduces latest advances protection, balancing, monitoring, lifetime improvement, all based PE technologies. Detailed discussion future research opportunities are given. aims to...

Fast and accurate fault diagnosis is crucial to transformer safety cost-effectiveness. Recently, vibration analysis for attracting increasing attention due its ease of implementation low cost, while the complex operating environment loads transformers also pose challenges. This study proposed a novel deep-learning-enabled method dry-type using signals. An experimental setup designed simulate different faults collect corresponding To find out information hidden in signals, continuous wavelet...

Several single-stage topologies have been introduced since kicking off the three-phase Z-source inverter (ZSI), and among these topologies, quasi-ZSI (qZSI) is most common one due to its simple structure continuous input current. Furthermore, different modulation strategies, utilizing multiple reference signals, developed as well. However, prior art methods some demerits, such complexity of generating gate increased number switch commutations with commutation at high current level during...

Harmonic emissions have been changed in distribution networks, with respect to frequency range and magnitude, due the penetration of modern power electronics systems. Two new ranges 2-9 9-150 kHz identified as disturbing affecting networks. This paper presents effects grid-connected three-phase systems different front-end topologies: conventional, small dc-link capacitor, electronic inductor. A converter a capacitor can create resonant line impedance below above 1 depending on grid...

Mission profiles such as environmental and operational conditions together with the system structure including energy resources, grid converter topologies induce stress on different converters thereby play a significant role power electronic systems reliability. Temperature swing maximum temperature are two of critical stressors most failure-prone components converters, i.e., capacitors semiconductors. Temperature-related generate electrothermal these ultimately triggering high potential...

Power converters are one of the failure sources in modern power systems, and hence driver maintenance downtime costs, which should be reduced by reliable design, control operation converters.This paper proposes a sharing strategy for evenly distributing thermal stresses among dc microgrids, consequently enhancing overall system reliability.The aim this is to extend aging process prone adjusting their loadings.The proposed approach employs prior experienced damages on converter's fragile...

Power sharing control among grid forming dc sources employing a conventional voltage droop approach meets inaccurate load and unacceptable regulation performance. Thereby, communication-based secondary supervisory controllers have been presented to overcome the aforementioned issues. Furthermore, with aim of eliminating communication system, frequency-based approaches introduced for low-voltage grids where frequency superimposed ac signal onto is proportional output power. However, in...

The microgrid concept has been emerged into the power system to provide reliable, renewable, and cheaper electricity for rising global demand. When microgrids are introduced, there will be several concerns, such as active reactive powers' sharing, load management, connecting main grid, voltage current deviations. Recently, with fast deployment of distributed generation, methods mitigate harmonics caused by nonlinear loads electronic devices have become one focus areas. Consequently, many...

This article introduces two general ways to derive single-phase bridgeless power factor correction (PFC) topologies and then, 15 accessible are derived based on the configuration of different basic types dc-dc converter cells. Although majority have been previously proposed, other possible research points reviewed. Besides, a consistent component sizing procedure with electric, thermal, cost models is applied conduct performance benchmarking these PFC in terms loss, volume, cost. Three...

A continuous improvement of power electronics technology has widely increased the applications adjustable speed motor drives in many areas. Beyond control flexibility, devices (e.g., diode rectifiers) are also main harmonic source to grid due their nonlinearity, which thus deteriorates quality and lowers conversion efficiency. Both degradations apt occur drive applications. At present, industrial equipped with three-phase rectifiers employ passive filtering techniques on ac or dc side...