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The ever-increasing need for higher efficiency, smaller size, and lower cost make the analysis, understanding, and design of energy conversion systems extremely important, interesting, and even imperative. One of the most neglected features in the study of such systems is the effect of the inherent nonlinearities on the stability of the system. Due to these nonlinearities, these devices may exhibit undesirable and complex dynamics, which are the focus of many researchers. Even though a lot of research has taken place in this area during the last 20 years, it is still an active research topic for mainstream power engineers. This research has demonstrated that these systems can become unstable with a direct result in increased losses, extra subharmonics, and even uncontrollability/unobservability. The detailed study of these systems can help in the design of smaller, lighter, and less expensive converters that are particularly important in emerging areas of research like electric vehicles, smart grids, renewable energy sources, and others. The aim of this Special Issue is to cover control and nonlinear aspects of instabilities in different energy conversion systems: theoretical, analysis modelling, and practical solutions for such emerging applications. In this Special Issue, we present novel research works in different areas of the control and nonlinear dynamics of energy conversion systems.

multi-clearance --- neural network --- zero average dynamics --- Cable3D --- variable bus voltage MG --- explosion-magnetic generator --- quadratic boost --- matrix norm --- coordinated control system --- permanent magnet synchronous motor (PMSM) --- photovoltaic (PV) --- power conversion --- capacitance current pulse train control --- air gap eccentricity --- high step-up voltage gain --- voltage ripple --- offset-free --- goal representation heuristic dynamic programming (GrHDP) --- current mode control --- sliding mode observer (SMO) --- multi-model predictive control --- combined heat and power unit --- discontinuous conduction mode (DCM) --- current-pulse formation --- sliding mode control --- single artificial neuron goal representation heuristic dynamic programming (SAN-GrHDP) --- subharmonic oscillations --- DC micro grid --- supply air temperature --- air-handling unit (AHU) --- vibration characteristics --- magnetic saturation --- slope compensation --- fixed-point inducting control --- the load of suspension point in the z direction --- variable switching frequency DC-DC converters --- droop control --- Helmholtz number --- plasma accelerator --- contraction analysis --- sliding control --- bifurcations in control parameter --- disturbance observer --- DC motor --- multiphysics --- virtual impedance --- pulverizing system --- ultrahigh voltage conversion ratio --- corrugated pipe --- DC-DC converters --- maximum power point tracking (MPPT) --- dynamic model --- nonlinear dynamics --- new step-up converter --- micro-grid --- global stability --- extended back electromotive force (EEMF) --- small-signal model --- electromagnetic vibration --- nonlinear dynamic model --- excited modes --- data-driven --- rigid body rotation --- position sensorless --- prediction --- centralized vs. decentralized control --- inferential control --- boost-flyback converter --- calculation method --- switched reluctance generator --- monodromy matrix --- bridgeless converter --- decoupling control --- distributed architecture --- wave --- buck converter --- soft sensor --- model–plant mismatches --- whistling noise --- efficiency optimization --- steel catenary riser --- moving horizon estimation --- single artificial neuron (SAN) --- space mechanism --- two-stage bypass --- electrical machine --- harmonic suppression --- local vs. global optimization --- performance recovery --- reinforcement learning (RL) --- adaptive dynamic programming (ADP) --- overvoltage --- planetary gears --- maximum power point tracking --- DC-DC buck converter --- power quality --- average-current mode control --- feedback coefficient --- power factor correction (PFC) --- capacitance current --- predictive control --- rotor dynamics

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Photovoltaic solar energy technology (PV) has been developing rapidly in the past decades, leading to a multi-billion-dollar global market. It is of paramount importance that PV systems function properly, which requires the generation of expected energy both for small-scale systems that consist of a few solar modules and for very large-scale systems containing millions of modules. This book increases the understanding of the issues relevant to PV system design and correlated performance; moreover, it contains research from scholars across the globe in the fields of data analysis and data mapping for the optimal performance of PV systems, faults analysis, various causes for energy loss, and design and integration issues. The chapters in this book demonstrate the importance of designing and properly monitoring photovoltaic systems in the field in order to ensure continued good performance.

fault diagnosis --- modeling --- simulation --- fault tree analysis --- photovoltaic system --- Bartlett’s test --- metaheuristic --- population density --- spatial analyses --- AC parameters --- parameter estimation --- fiber reinforced polymeric plastic (FRP) --- Hartigan’s dip test --- energy --- image processing --- real data --- photovoltaic (PV) systems monitoring --- forecast --- photovoltaic plants --- system --- graphical malfunction detection --- defects --- STATCOM --- photo-generated current --- performance analysis --- photovoltaic module performance --- solar energy --- urban context --- thermal interaction --- underdamped oscillation --- reliability --- membership algorithm --- photovoltaic systems --- availability --- fuzzy logic controller --- ANOVA --- solar farm --- energy yield --- cluster analysis --- photovoltaics --- annual yield --- residential buildings --- PV array --- PV system --- dc-dc converter --- quasi-opposition based learning --- grid-connected --- performance ratio --- organic soiling --- vegetated/green roof --- conventional roof membrane --- UV-fluorescence imaging --- PV thermal performance --- PV systems --- failure mode and effect analysis --- ageing and degradation of PV-modules --- sheet molding compound FRP --- Jarque-Bera’s test --- Tukey’s test --- technical costs --- Kruskal-Wallis’ test --- improved cuckoo search algorithm --- PV energy performance --- pultruded FRP --- cracks --- maximum power point tracking (MPPT) --- structural design --- software development --- floating PV generation structure --- malfunction detection --- modules --- photovoltaic performance --- maximum power point --- GIS --- impedance spectroscopy --- floating PV systems (FPV) --- solar cells --- Renewable Energy --- loss analysis --- shade resilience --- Scanning Electron Microscopy (SEM) --- failure detection --- optimization problem --- failure rates --- FCM algorithm --- stability analysis --- reactive power support --- mooring system --- buck converter --- Mood’s Median test --- photovoltaic modeling --- module architecture --- PV module --- data analysis --- partial shading --- opposition-based learning --- silicon --- floating PV module (FPVM) --- electroluminescence --- urban compactness

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Wide bandgap (WBG) semiconductors are becoming a key enabling technology for several strategic fields, including power electronics, illumination, and sensors. This reprint collects the 23 papers covering the full spectrum of the above applications and providing contributions from the on-going research at different levels, from materials to devices and from circuits to systems.

energy storage system --- power conditioning system --- silicon carbide --- vanadium redox flow batteries --- AlGaN/GaN --- SiC --- high electron mobility transistor --- Schottky barrier diode --- breakdown field --- noise --- charge traps --- radio frequency --- wide-bandgap (WBG) --- gallium nitride (GaN) --- silicon carbide (SiC) --- high electron mobility transistor (HEMT) --- metal-oxide-semiconductor field effect transistor (MOSFET) --- driving technology --- nickel oxide --- annealing temperature --- crystallite size --- optical band gap --- electrochromic device --- indium oxide thin film --- solution method --- plasma surface treatment --- bias stability --- aluminum nitride --- Schottky barrier diodes --- radio frequency sputtering --- X-ray diffraction --- X-ray photoelectron spectroscopy --- piezoelectric micromachined ultrasonic transducers --- ranging --- time of flight (TOF) --- time to digital converter circuit (TDC) --- AlGaN/GaN heterojunction --- p-GaN gate --- unidirectional operation --- rectifying electrode --- first-principles --- density functional theory --- pure β-Ga2O3 --- Sr-doped β-Ga2O3 --- p-type doping --- band structure --- density of states --- optical absorption --- AlN buffer layer --- NH3 growth interruption --- strain relaxation --- GaN-based LED --- low defect density --- gate bias modulation --- palladium catalyst --- gallium nitride --- nitrogen dioxide gas sensor --- laser micromachining --- sapphire --- AlGaN/GaN heterostructures --- high-electron mobility devices --- p-GaN gate HEMT --- normally off --- low-resistance SiC substrate --- temperature --- high electron-mobility transistor (HEMT) --- equivalent-circuit modeling --- microwave frequency --- scattering-parameter measurements --- GaN --- MIS-HEMTs --- fabrication --- threshold voltage stability --- supercritical technology --- GaN power HEMTs --- breakdown voltage --- current collapse --- compensation ratio --- auto-compensation --- carbon doping --- HVPE --- AlN --- high-temperature --- buffer layer --- nitridation --- high-electron mobility transistor --- heterogeneous integration --- SOI --- QST --- crystal growth --- cubic and hexagonal structure --- blue and yellow luminescence --- electron lifetime --- wafer dicing --- stealth dicing --- laser thermal separation --- dry processing --- laser processing --- wide bandgap semiconductor --- photovoltaic module --- digital signal processor --- synchronous buck converter --- polar --- semi-polar --- non-polar --- magnetron sputtering --- HTA --- GaN-HEMT mesa structures --- 2DEG --- X-ray sensor --- X-ray imaging --- n/a

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Power electronics technology is still an emerging technology, and it has found its way into many applications, from renewable energy generation (i.e., wind power and solar power) to electrical vehicles (EVs), biomedical devices, and small appliances, such as laptop chargers. In the near future, electrical energy will be provided and handled by power electronics and consumed through power electronics; this not only will intensify the role of power electronics technology in power conversion processes, but also implies that power systems are undergoing a paradigm shift, from centralized distribution to distributed generation. Today, more than 1000 GW of renewable energy generation sources (photovoltaic (PV) and wind) have been installed, all of which are handled by power electronics technology. The main aim of this book is to highlight and address recent breakthroughs in the range of emerging applications in power electronics and in harmonic and electromagnetic interference (EMI) issues at device and system levels as discussed in ?robust and reliable power electronics technologies, including fault prognosis and diagnosis technique stability of grid-connected converters and ?smart control of power electronics in devices, microgrids, and at system levels.

Q-factor --- lithium-ion power battery pack --- electromagnetic field (EMF) --- expert systems --- total harmonic distortion (THD) --- current-fed inverter --- rotor design --- class-D amplifier --- LCL-S topology --- current switching ripple --- system in package --- energy storage modelling --- smart micro-grid --- embedded systems --- equivalent inductance --- SHIL --- permanent magnet --- static var generator (SVG) --- permanent magnet synchronous motor (PMSM) --- control strategy and algorithm --- digital control --- zero-voltage switching (ZVS) --- SOC estimator --- electric power --- optimal design --- electromagnetic field interference (EMI) --- line frequency instability --- analog phase control --- five-phase permanent magnet synchronous machine --- distribution generation --- leakage inductance --- adjacent two-phase open circuit fault (A2-Ph) --- chaotic PWM --- electric vehicles --- CMOS chaotic circuit --- series active filter --- cascaded topology --- total demand distortion --- efficiency motor --- triangular ramp generator --- 4T analog MOS control --- inductive coupling --- induction machines --- nanocrystalline core --- semi-active bridge --- multi-level control --- simulation models --- voltage source inverters (VSI) --- battery management system BMS --- voltage source converter --- current control loops --- droop control --- particle swarm optimization --- variable control gain --- state of charge SoC --- extended Kalman filter --- transient control --- multi-objective optimization --- composite equalizer --- converter --- DHIL --- five-leg voltage source inverter --- axial flux machines --- bifurcation --- active receivers --- field programmable gate array --- Nyquist stability analysis --- electric vehicle --- static compensator --- stability --- common-mode inductor --- DC–DC converters --- support vector machines --- electromagnetic compatibility --- real-time simulation --- passive equalization --- matrix converters --- wireless power transfer --- digital phase control --- compensation topology --- volt-per-hertz control (scalar control) --- switching losses --- voltage control --- hybrid converter --- bidirectional converter --- coupling factor --- selective harmonic elimination method --- power electronics --- soft switching --- optimization design --- multilevel inverter --- five-phase machine --- phase-shift control --- lithium-ion battery --- voltage boost --- VPI active damping control --- parameter identification --- electrical engineering communications --- current control --- DC–DC conversion --- battery management system --- GaN cascode --- single-switch --- high-frequency modeling --- synchronous motor --- power quality --- water purification --- power factor correction (PFC) --- composite active vectors modulation (CVM) --- digital signal controller --- line start --- power density --- hardware in loop --- n/a --- fault diagnosis --- multi-level converter (MLC) --- induction motor --- dual three-phase (DTP) permanent magnet synchronous motors (PMSMs) --- neural networks --- electromagnetic interference filter --- battery chargers --- power converter --- harmonics --- multiphase space vector modulation --- torque ripple --- power factor correction --- electrical drives --- modular multilevel converter (MMC) --- active power filter --- double layer capacitor (DLC) models --- PMSG --- response time --- resonator structure --- floating-point --- effect factors --- DC-link voltage control --- sliding mode control --- phasor model technique --- wireless power transfer (WPT) --- slim DC-link drive --- fault-tolerant control --- lithium-ion batteries --- DC-AC power converters --- conducting angle determination (CAD) techniques --- variable speed pumped storage system --- impedance-based model --- one cycle control --- renewable energy sources --- series-series compensation --- cogging torque --- active rectifiers --- three-level boost converter (TLBC) --- DC-link cascade H-bridge (DCLCHB) inverter --- battery energy storage systems --- filter --- power management system --- improved extended Kalman filter --- dead-time compensation --- disturbance observer --- reference phase calibration --- frequency locking --- space vector pulse width modulation (SVPWM) --- predictive controllers --- nine switch converter --- transmission line --- spread-spectrum technique --- energy storage --- electromagnetic interference --- renewable energy resources control --- harmonic linearization --- misalignment --- plug-in hybrid electric vehicles --- high level programing --- nearest level modulation (NLM) --- magnetic equivalent circuit --- EMI filter --- permanent-magnet machines --- real-time emulation --- switched capacitor --- back EMF --- fixed-point --- HF-link MPPT converter --- condition monitoring --- WPT standards --- switching frequency --- switching frequency modelling --- high frequency switching power supply --- field-programmable gate array --- three-phase bridgeless rectifier --- ice melting --- AC–DC power converters --- hybrid power filter --- PSpice --- microgrid control --- total harmonic distortion --- grid-connected inverter --- dynamic PV model --- fuzzy --- boost converter --- SiC PV Supply --- voltage doubling --- nonlinear control --- distributed control --- power system operation and control --- one phase open circuit fault (1-Ph) --- direct torque control (DTC) --- battery modeling --- non-linear phenomena --- frequency-domain analysis --- advanced controllers --- vector control --- fixed-frequency double integral sliding-mode (FFDISM) --- power converters --- modulation index --- DC-DC buck converter --- small signal stability analysis --- active equalization --- voltage source inverter --- hardware-in-the-loop --- current source --- synchronization --- grid-connected VSI --- synchronous generator --- fault tolerant control --- DC-DC converters --- DC-DC conversion --- AC-DC power converters