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The Special Issue "Computational Intelligence Application in Electrical Engineering" deals with the application of computational intelligence techniques in various areas of electrical engineering. The topics of computational intelligence applications in smart power grid optimization, power distribution system protection, and electrical machine design and control optimization are presented in the Special Issue. The co-simulation approach to metaheuristic optimization methods and simulation tools for a power system analysis are also presented. The main computational intelligence techniques, evolutionary optimization, fuzzy inference system, and an artificial neural network are used in the research presented in the Special Issue. The articles published in this issue present the recent trends in computational intelligence applications in the areas of electrical engineering.

active distribution network --- computational intelligence --- optimization algorithms --- optimal distribution system management --- optimal Smart Grid management --- advanced distribution system optimization --- renewable distributed generation --- Smart Grid optimization --- co-simulation --- computational intelligence techniques --- distributed generation --- optimal allocation and control --- power system protection --- overcurrent relays --- protection relays --- metaheuristic --- school-based optimizer --- electric markets --- photovoltaic generation --- Monte Carlo simulations --- power flow --- S-iteration process --- Newton–Raphson --- high order newton-like method --- computational efficiency --- line-start synchronous motor --- efficiency factor --- power factor --- optometric analysis --- transient models --- induction machine --- ant colony optimization --- predictive current control --- fuzzy logic control --- Takagi–Sugeno --- n/a --- Newton-Raphson --- Takagi-Sugeno

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The synergy between artificial intelligence and power and energy systems is providing promising solutions to deal with the increasing complexity of the energy sector. Multi-agent systems, in particular, are widely used to simulate complex problems in the power and energy domain as they enable modeling dynamic environments and studying the interactions between the involved players. Multi-agent systems are suitable for dealing not only with problems related to the upper levels of the system, such as the transmission grid and wholesale electricity markets, but also to address challenges associated with the management of distributed generation, renewables, large-scale integration of electric vehicles, and consumption flexibility. Agent-based approaches are also being increasingly used for control and to combine simulation and emulation by enabling modeling of the details of buildings’ electrical devices, microgrids, and smart grid components. This book discusses and highlights the latest advances and trends in multi-agent energy systems simulation. The addressed application topics include the design, modeling, and simulation of electricity markets operation, the management and scheduling of energy resources, the definition of dynamic energy tariffs for consumption and electrical vehicles charging, the large-scale integration of variable renewable energy sources, and mitigation of the associated power network issues.

EV charging --- multi-agent system --- digital twin --- customer satisfaction indicator --- smart microgrid --- energy management system --- real-time optimization --- immune system algorithm --- economic dispatch --- energy consumption --- wireless sensor network --- cooperation --- collaboration --- ontology --- energy sector --- scoping review --- decision-aid --- distributed energy resources --- distribution system operator --- reactive power management --- uncertainty --- day-ahead market --- balancing market --- bilateral trading --- market design --- variable renewable energy --- agent-based simulation --- MATREM system --- congestion management --- dynamic tariff --- agent-based distribution networks --- demand response --- routing protocols --- performance parameters --- Wireless Sensor Network (WSN)

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The Special Issue on Advances in Water Distribution Networks (WDNs) explores four important topics of research in the framework of WDNs, namely simulation and optimization modelling, topology and partitioning, water quality, and service effectiveness. With regard to the first topic, the following aspects are addressed: pressure-driven formulations, algorithms for the optimal location of control valves to minimize leakage, the benefits of water discharge prediction for the remote real time control of valves, and transients generated by pumps operating as turbines. In the context of the second topic, a topological taxonomy of WDNs is presented, and partitioning methods for the creation of district metered areas are compared. In relation to the third topic, the vulnerability to trihalomethane is assessed, and a statistical optimization model to minimize heavy metal releases is presented. Finally, the fourth topic focusses on the estimation of non-revenue water, including leakage and unauthorized consumption, and on the assessment of service under intermittent supply conditions.

water distribution system --- artificial neural network --- 24 --- non-revenue water --- runaway conditions --- water quality (WQ) --- release of heavy metals (HMR) --- water service quality --- district metered areas --- modularity --- water distribution network --- optimization --- multiple source waters blending optimization (MSWBO) --- disinfection by-products --- multiple regression analysis --- snapshot simulation --- blending --- pump --- graph partitioning --- dual response surface optimization (DRSO) --- pressure-driven --- topological analysis --- pressure --- unsteady flow --- vulnerability --- water quality --- water distribution modelling --- real time control --- mathematical model --- water distribution network management --- energy recovery systems --- valve --- water hammer --- intermittent water supply --- leakage --- complex network theory

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The modern electric power system has evolved into a huge nonlinear complex system due to the interconnection of thousands of generation and transmission systems. The unparalleled growth of renewable energy resources (RESs) has caused significant concern regarding grid stability and power quality, and it is essential to find ways to control such a massive system for effective operation. The controllability of HVDC and FACTS devices allows for improvement of the dynamic behavior of grids and their flexibility. Research is being carried out at both the system and component levels of modelling, control, and stability. This Special Issue aims to present novel HVDC topologies and operation strategies to prevent abnormal grid conditions.

DC distribution system --- back-to-back HVDC --- virtual impedance --- n/a --- synchronous condenser (SC) --- VSC–HVDC --- embedded HVDC --- Powell’s direct set method --- special protection system --- loss minimization --- grid-interconnection --- multi-infeed HVDC system --- reclosing process --- modular multilevel converter (MMC) --- grid service of HVDC --- angle stability --- impedance-based Nyquist stability criterion --- HVDC operation point --- commutation failure probability --- power control --- AC/DC converter --- VSC HVDC --- frequency droop control --- protection --- high voltage direct current (HVDC) --- quantitative evaluation --- short-circuit current calculation --- active power control strategies --- grounding system --- LCC HVDC --- insulation monitoring device (IMD) --- 3-phase AC/DC PWM converter --- transient stability --- angle spread --- reclosing current limiting resistance (RCLR) --- BTB-HVDC --- full bridge (FB) --- GVIF index --- system loss minimization --- SOGI-FLL --- half bridge (HB) --- fault current limiter (FCL) --- VSC-HVDC --- line commutated converter --- DC distribution --- hybrid HVDC breaker (HCB) --- phase detection --- DC-side oscillation --- Powell's direct set method

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This Special Issue “Power System Simulation, Control and Optimization” offers valuable insights into the most recent research developments in these topics. The analysis, operation, and control of power systems are increasingly complex tasks that require advanced simulation models to analyze and control the effects of transformations concerning electricity grids today: Massive integration of renewable energies, progressive implementation of electric vehicles, development of intelligent networks, and progressive evolution of the applications of artificial intelligence.

subhourly modeling --- stochastic unit commitment --- cosimulation method --- sensitivity analysis --- power system dynamic performance --- cooling system --- dynamic programming --- metal-air battery --- receding horizon control --- state variables --- uninterruptible power supply --- power flow computation --- high performance computing (HPC) --- parallelism --- parallel computation --- LU decomposition --- security-constrained optimal power flow --- chance-constrained optimization --- probability of contingency --- renewable energy source --- flexible AC transmission systems --- tabu search --- multi-objective --- power systems --- impartial and open dispatching --- economy --- Gini coefficient --- generation scheduling --- mixed integer quadratic programming --- flexible loads --- market clearing --- safety checking --- interior point method --- electric safety --- induction motor --- fan --- overcurrent protection --- aggregation --- ancillary services --- distributed energy resources --- optimization --- power system operation --- automatic generation control (AGC) --- frequency control --- dynamic deadband --- energy management system (EMS) --- governor response --- voltage collapse --- voltage control --- transformer controller --- adaptive algorithm --- voltage regulation --- distribution system --- power distribution network --- distributed generation --- OLTC --- solar radiation modeling --- GIS --- interpolation --- digital elevation model --- data mining --- ANFIS --- multistrand cable lines --- ampacity --- skin and proximity effects --- symmetry