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The present book contains nine articles that were accepted and published in the Special Issue “Modeling and Control of Energy Conversion during Underground Coal Gasification Process” of the MDPI Energies journal. This book focuses on the energy conversion processes in underground coal gasification (UCG), as well as on the modeling and control of this process. The articles published in this book can be divided into three thematic parts of research in the field of underground coal gasification technology: the first part is the impact of technology on the environment, the second is research (studies) on the coal areas and coal properties of UCG technology, and the third is the monitoring, modeling, and control processes within UCG. We hope that this book will be interesting and useful for workers and researchers in the field of underground coal gasification technology, as well as for those who are interested in the mathematical modeling and control of this process.
Technology: general issues --- History of engineering & technology --- low-carbon energy --- UCG technology --- grouting --- solidification soil --- soil air --- statistic model --- soil contamination --- atmospheric geochemical survey --- environmental burden --- underground coal gasification (UCG) --- optimization --- syngas --- calorific value --- optimal control --- operating variables --- control algorithm --- coal gasification --- rocks --- coal seam --- material balance --- heat balance --- tightness --- gas --- underground coal gasification --- georeactor --- char --- melted waste rock --- gas permeability --- tortuosity --- porosity --- measurement --- temperature --- regression --- model --- analyses --- cavity --- lignite --- UCG --- ex situ tests --- high temperature --- strength and structural parameters of rocks after heating --- destruction zone around gasified channel --- SNG --- UCG wastewater --- environmental impact assessment --- correlation analysis --- effluents --- n/a
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This book is a collection of papers covering various aspects of the optimal control of power and energy production from renewable resources (wind, PV, biomass, hydrogen, etc.). In particular, attention is focused both on the optimal control of new technologies and on their integration in buildings, microgrids, and energy markets. The examples presented in this book are among the most promising technologies for satisfying an increasing share of thermal and electrical demands with renewable sources: from solar cooling plants to offshore wind generation; hybrid plants, combining traditional and renewable sources, are also considered, as well as traditional and innovative storage systems. Innovative solutions for transportation systems are also explored for both railway infrastructures and advanced light rail vehicles. The optimization and control of new solutions for the power network are addressed in detail: specifically, special attention is paid to microgrids as new paradigms for distribution networks, but also in other applications (e.g., shipboards). Finally, optimization and simulation models within SCADA and energy management systems are considered. This book is intended for engineers, researchers, and practitioners that work in the field of energy, smart grid, renewable resources, and their optimization and control.
History of engineering & technology --- fuel cell --- power control --- multi-objective optimization --- equivalent consumption minimization strategy --- firefly algorithm --- hybrid light rail vehicle --- solar energy --- Fresnel collector --- model predictive control --- fuzzy algorithm --- hybrid systems --- shipboard microgrids --- photovoltaic (PV) systems --- energy storage technologies --- microgrids --- hybrid energy storage systems (HESS) --- floating offshore wind turbine --- aerodynamic platform stabiliser --- wave rejection --- feedback loop --- control --- optimisation --- energy storage --- pumped storage hydro --- ternary pumped storage hydro --- dynamic simulation --- dynamic modeling --- inertia --- renewable energy --- power system --- primary control --- BESS --- microgrid --- Grid Forming --- Grid Support --- Inverter Control --- DIgSILENT PowerFactory --- EMT simulations --- eco-friendliness --- smart railway --- smart electrical infrastructure --- control algorithm --- regenerative braking energy --- smart grid --- optimization --- energy management system --- interconnected buildings --- renewable resources --- multi-level --- aggregator --- wind-diesel power plant --- intelligent control system --- diesel-generator set --- internal combustion engine --- artificial neural network --- fuel economy --- co-simulation --- SCADA --- operator training --- building energy management system --- simulation --- equivalent electric circuit
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Wind Power Plant (WPP) and Wind Turbine (WT) modeling are becoming of key importance due to the relevant wind-generation impact on power systems. Wind integration into power systems must be carefully analyzed to forecast the effects on grid stability and reliability. Different agents, such as Transmission System Operators (TSOs) and Distribution System Operators (DSOs), focus on transient analyses. Wind turbine manufacturers, power system software developers, and technical consultants are also involved. WPP and WT dynamic models are often divided into two types: detailed and simplified. Detailed models are used for Electro-Magnetic Transient (EMT) simulations, providing both electrical and mechanical responses with high accuracy during short time intervals. Simplified models, also known as standard or generic models, are designed to give reliable responses, avoiding high computational resources. Simplified models are commonly used by TSOs and DSOs to carry out different transient stability studies, including loss of generation, switching of power lines or balanced faults, etc., Assessment and validation of such dynamic models is also a major issue due to the importance and difficulty of collecting real data. Solutions facing all these challenges, including the development, validation and application of WT and WPP models are presented in this Issue.
History of engineering & technology --- bearing current --- common mode current --- doubly fed induction generators --- permanent magnet synchronous generators --- wind turbine generator --- doubly-fed generator --- converter control --- short-circuit current --- second harmonic component --- low-voltage ride-through (LVRT) field test data --- complex terrain --- terrain-induced turbulence --- turbulence intensity --- LES --- vortex shedding --- frequency control --- wind power integration --- power system stability --- turbulence --- statistical modelling --- Wind Turbine (WT) --- Doubly Fed Induction Generator (DFIG) --- unbalanced grid voltage --- DC-linked voltage control --- Proportional Resonant with Resonant Harmonic Compensator (PR+HC) controller --- Adaptive Proportional Integral (API) control --- power control --- wind turbine near wake --- wind turbine wakes --- wake aerodynamics --- computational fluid dynamics --- rotor aerodynamics --- wind turbine validation --- MEXICO experiment --- wind energy --- model validation --- wind turbine aerodynamics --- wind farms --- wind turbines interaction --- wind farm modeling --- kernel density estimation --- multiple wind farms --- joint probability density --- ordinal optimization --- reactive power capability --- wind power plant --- wind power collection system --- aggregated, modelling --- wind integration studies --- long term voltage stability --- fault-ride through capability --- IEC 61400-27-1 --- Spanish PO 12.3 --- Type 3 wind turbine --- inertia --- wind power --- droop --- primary control --- frequency containment process --- wind integration --- demand response --- ancillary services --- wind turbine nacelle --- lightning electromagnetic pulse (LEMP) --- magnetic field intensity --- shielding mesh --- wake steering --- yaw misalignment --- multi body simulation --- main bearing loads --- rain flow counts --- aeroelasticity --- multi-rotor system --- wind turbine --- computational fluid dynamics (CFD) --- horizontal-axis wind turbine (HAWT) --- permanent-magnet synchronous-generator (PMSG) --- linear quadratic regulator (LQR) --- PI control algorithm --- LQR-PI control --- wind turbine blade --- large-eddy simulation --- turbulence evaluation index --- fatigue damage evaluation index --- DIgSILENT-PowerFactory --- MATLAB --- transient stability --- type 3 wind turbine --- DFIG --- field testing --- full-scale converter --- generic model --- validation --- HAWT --- aerodynamic characteristics --- dynamic yawing process --- near wake --- start-stop yaw velocity --- load frequency control (LFC) --- equivalent input disturbance (EID) --- active disturbance rejection control (ADRC) --- wind --- linear matrix inequalities (LMI) --- dynamic modeling --- grey-box parameter identification --- subspace identification --- recursive least squares --- optimal identification
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Advances in miniaturization of sensors, actuators, and smart systems are receiving substantial industrial attention, and a wide variety of transducers are commercially available or with high potential to impact emerging markets. Substituting existing products based on bulk materials, in fields such as automotive, environment, food, robotics, medicine, biotechnology, communications, and other technologies, with reduced size, lower cost, and higher performance, is now possible, with potential for manufacturing using advanced silicon integrated circuits technology or alternative additive techniques from the mili- to the nano-scale. In this Special Issue, which is focused on piezoelectric transducers, a wide range of topics are covered, including the design, fabrication, characterization, packaging, and system integration or final applications of mili/micro/nano-electro-mechanical systems based transducers.
History of engineering & technology --- cylindrical composite --- piezoceramic/epoxy composite --- electromechanical characteristics --- transducer --- piezoelectric actuators --- positioning --- trajectory control --- numerical analysis --- trajectory planning --- square piezoelectric vibrator --- resonance --- piezoelectric diaphragm pump --- flexible support --- piezoelectric resonance pump --- piezoelectric ceramics actuators --- hysteresis modeling --- Bouc–Wen model --- P-type IL --- MFA control --- SM control --- evidence theory --- active vibration control --- piezoelectric smart structure --- piezoelectric material --- multiphysics simulation --- finite element method (FEM) --- fluid–structure interaction (FSI) --- micro electromechanical systems (MEMS) --- traveling waves --- piezoelectric --- microactuator --- MEMS --- piezoelectric current sensing device --- two-wire power cord --- cymbal structure --- force amplification effect --- sensitivity --- ciliary bodies touch beam --- piezoelectric tactile feedback devices --- anisotropic vibration tactile model --- human factor experiment --- nondestructive testing --- maturity method --- concrete early-age strength --- SmartRock --- ultrasonic waves --- PZT (piezoelectric) sensors --- structural health monitoring --- AlN thin film --- piezoelectric effect --- resonant accelerometer --- z-axis --- debonding --- non-destructive testing --- electromechanical impedance --- damage detection --- impedance-based technique --- damage depth --- piezoelectric vibration energy harvester --- frequency up-conversion mechanism --- impact --- PZT thick film --- piezoelectric ceramic materials --- Duhem model --- hysteresis model --- class-C power amplifier --- diode expander --- piezoelectric transducers --- point-of-care ultrasound systems --- transverse impact --- frequency up-conversion --- piezoelectric bimorph --- human-limb motion --- hybrid energy harvester --- cascade-connected transducer --- low frequency --- small size --- finite element --- acoustic telemetry --- measurement while drilling --- energy harvesting --- pipelines --- underwater networks --- wireless sensor networks --- control algorithm --- waterproof --- coating --- reliability --- flexible micro-devices --- aqueous environments --- seawater --- capacitive pressure sensors --- in-situ pressure sensing --- sensor characterization --- physiological applications --- cardiac output --- aluminum nitride --- resonator --- damping --- quality factor --- electromechanical coupling --- implantable middle ear hearing device --- piezoelectric transducer --- stimulating site --- finite element analysis --- hearing compensation --- adaptive lens --- piezoelectric devices --- fluid-structure interaction --- moving mesh --- thermal expansion --- COMSOL --- petroleum acoustical-logging --- piezoelectric cylindrical-shell transducer --- center-frequency --- experimental-measurement --- piezoelectricity --- visual servo control --- stepping motor --- nano-positioner --- stick-slip --- piezoelectric energy harvester --- cut-in wind speed --- cut-out wind speed --- energy conservation method --- critical stress method --- piezoelectric actuator --- lever mechanism --- analytical model --- stick-slip frication --- nanopositioning stage --- piezoelectric hysteresis --- mark point recognition --- piecewise fitting --- compensation control --- piezo-electromagnetic coupling --- up-conversion --- vibration energy harvester --- multi-directional vibration --- low frequency vibration --- hysteresis compensation --- single-neuron adaptive control --- Hebb learning rules --- supervised learning --- vibration-based energy harvesting --- multimodal structures --- frequency tuning --- nonlinear resonator --- bistability --- magnetostatic force --- robot --- miniature --- traveling wave --- leg --- piezoelectric actuators (PEAs) --- asymmetric hysteresis --- Prandtl–Ishlinskii (PI) model --- polynomial-modified PI (PMPI) model --- feedforward hysteresis compensation --- PIN-PMN-PT --- 1-3 composite --- high frequency --- phased array --- n/a --- Bouc-Wen model --- fluid-structure interaction (FSI) --- Prandtl-Ishlinskii (PI) model
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