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Dynamic stability basically deals with the interactions between the system's components. Following a disturbance, the system's variables undergo transitions that can induce oscillations in active and reactive power generation, resulting in the occurrence of voltage oscillatory modes and frequency deviation in the system. Depending on the entity of the disturbance, the small- or large-signal stability of the system under consideration can be investigated. The introduction of RES-based generation that does not participate in the network services (i.e., frequency and voltage regulation) due to lack of special controls will undoubtedly affect both the overall frequency and voltage stability. Large-scale transient stability is also a concern not to be overlooked: inverter-based wind and solar generation have different angle/speed swing behaviors with respect to traditional generation due to reduced inertia, different voltage swing behaviors due to different voltage control systems, different power flow patterns, and different displacements of synchronous generation at key locations. Therefore, although power system stability and dynamics have played a very central role in the management and study of electrical power systems thus far, it is also true that the emerging scenario requires new methodologies, technologies, and analyses. In this light, the current Special Issue aims to collect contributions (i.e., research papers and review articles) on power system dynamics and stability from experts in academia and industry.

Technology: general issues --- History of engineering & technology --- power system stability --- inertia estimation --- PMU --- microgrids --- frequency control --- grid-forming --- 100% converter-interfaced generation --- virtual synchronous machine --- forced oscillation --- inverter-based resources (IBRs) --- grid vulnerability analysis --- active power modulation --- virtual inertia --- fast frequency measurement --- fast frequency regulation --- distributed energy resources --- ancillary services --- power hardware-in-the-loop --- legacy resources --- large perturbation angle stability --- small perturbation angle stability --- voltage stability --- synthetic inertia --- demand response --- reactive compensation --- power system restoration --- primary frequency control --- frequency nadir estimation --- low inertia systems --- real-time dynamic simulation --- national power grid --- cyber physical system (CPS) --- co-simulation --- battery energy storage system (BESS) --- energy management system (EMS) --- load modelling --- line modelling --- power system analysis --- transient stability --- small-signal stability --- inverter-based resources --- modular multilevel converters --- primary frequency regulation --- battery energy storage system --- Ornstein–Uhlenbeck stochastic process --- compound poisson stochastic process --- frequency stability --- rotor angle stability --- power system inertia --- converter-interfaced generation --- renewable power generators

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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

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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.

Technology: general issues --- 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 --- 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

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Today, there is a great deal of attention focused on sustainable growth worldwide. The increase in efficiency in the use of energy may even, in this historical moment, bring greater benefit than the use of renewable energies. Electricity appears to be the most sustainable of energies and the most promising hope for a planet capable of growing without compromising its own health and that of its inhabitants. Power electronics and electrical drives are the key technologies that will allow energy savings through the reduction of energy losses in many applications. This Special Issue has collected several scientific contributions related to energy efficiency in electrical equipment. Some articles are dedicated to the use and optimization of permanent magnet motors, which allow obtaining the highest level of efficiency. Most of the contributions describe the energy improvements that can be achieved with power electronics and the use of suitable control techniques. Last but not least, some articles describe interesting solutions for hybrid vehicles, which were created mainly to save energy in the smartest way possible.

History of engineering & technology --- LLC resonant converter --- resonant transformer --- fringing effect --- adjustable magnetizing inductance --- efficiency --- optimal design --- oil pump --- brushless DC --- motor --- robust --- vehicles --- eddy current coupling --- hybrid excited --- magnetic equivalent circuit --- magnetic field analysis --- torque-slip characteristic --- switched inductor capacitor converter --- a power converter --- energy transfer media --- ripple voltage --- conduction loss --- Hybrid Electric Vehicle (HEV) --- series architecture --- supercapacitor --- Energy Management System (EMS) --- storage sizing --- energy efficiency --- backlight --- DC-DC converter --- passive snubber --- voltage stress --- maximum-torque-per-ampere (MTPA) --- torque control --- per unit --- IPMSM --- SiC devices --- Si devices --- three level NPC inverter --- three level T-NPC inverter --- two level SiC MOSFET inverter --- overvoltages --- heat sink volume --- motor emulator --- power loss --- current tracking --- finite set model predictive control --- medium frequency transformer --- power electronic transformer --- Solid State Transformer (SST) --- railway electric traction --- Modular Multilevel Converter (MMC) --- soft-switching --- DC–DC converter --- multi-input converter --- battery --- hybrid electric vehicle (HEV), efficiency --- permanent magnet motor --- synchronous motor --- brushless drive --- industrial application --- turbocompound --- turbocharger --- hybrid electric vehicle (HEV) --- fuel economy