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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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Power converters and electric machines represent essential components in all fields of electrical engineering. In fact, we are heading towards a future where energy will be more and more electrical: electrical vehicles, electrical motors, renewables, storage systems are now widespread. The ongoing energy transition poses new challenges for interfacing and integrating different power systems. The constraints of space, weight, reliability, performance, and autonomy for the electric system have increased the attention of scientific research in order to find more and more appropriate technological solutions. In this context, power converters and electric machines assume a key role in enabling higher performance of electrical power conversion. Consequently, the design and control of power converters and electric machines shall be developed accordingly to the requirements of the specific application, thus leading to more specialized solutions, with the aim of enhancing the reliability, fault tolerance, and flexibility of the next generation power systems.

power systems for renewable energy --- fault-tolerant photovoltaic inverter --- islanding detection --- energy storage system --- DC/AC converter --- voltage-source --- multilevel inverter --- PV systems --- neutral point clamped inverter --- flying capacitor inverter --- cascaded inverter --- renewable energy systems --- ultra-fast chargers --- input-series input-parallel output-series output-parallel multimodule converter --- cross feedback output current sharing --- reflex charging --- digital twin --- doubly-fed induction generator, electrical machines --- finite elements method --- monitoring --- real-time --- wound rotor induction machine --- subsynchronous control interaction --- super-twisting sliding mode --- variable-gain --- doubly fed induction generator --- photovoltaic system --- grid --- sliding mode control --- synergetic control --- fractional-order control --- converter–machine association --- direct drive machine --- Permanent Magnet Vernier Machine --- synchronous generator --- wind energy system for domestic applications --- renewable energy --- adaptive --- fuzzy --- feedback linearization --- photovoltaic (PV) grid inverter --- voltage source inverter (VSI) --- doubly-fed induction generator --- wind power system --- sensorless control --- full order observer --- field oriented control --- grid connected system --- lithium batteries --- los minimization --- Modular Multilevel Converters --- optimization methods

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This book is a collection of scientific papers concerning multilevel inverters examined from different points of view. Many applications are considered, such as renewable energy interface, power conditioning systems, electric drives, and chargers for electric vehicles. Different topologies have been examined in both new configurations and well-established structures, introducing novel and particular modulation strategies, and examining the effect of modulation techniques on voltage and current harmonics and the total harmonic distortion.

total harmonic distortion (THD) --- imperialist competitive algorithm --- fault detection --- automatic current balance --- small signal modeling --- phase-shifted PWM --- voltage balance control --- parasitic switching states --- multi-terminal DC network (MTDC) --- DC-link capacitor voltage balancing --- high efficiency drive --- modular multilevel converters --- DC-link voltage balancing --- power factor correction --- selected harmonic elimination --- Continuous Wavelet Transform --- power flow analysis --- T-type inverter --- electrical drives --- modular multilevel converter (MMC) --- computational cost --- fault location --- voltage imbalance --- DC-link capacitor design --- multilevel active-clamped converter --- dc-link capacitor voltage balance --- voltage ripple --- commutation --- model predictive control (MPC) --- voltage fluctuation --- multi-motor drive --- Balance of capacitor voltage --- on-board battery charger --- single-phase three-level NPC converter --- Suppression of CMV --- redundant switching combination --- ACTPSS --- model predictive control --- three-loop --- finite control set model predictive control --- current estimation --- five-level --- fault-tolerant control --- offset voltage injection --- harmonic component --- current unmeasurable areas --- LC filter --- computational burden --- interleaved buck --- three-level converter --- IGBT short-circuit --- SVPWM --- harmonic --- DC side fault blocking --- three-phase to single-phase cascaded converter --- single shunt resistor --- buck-chopper --- power factor --- modulation techniques --- modular multilevel converters (MMC) --- permanent magnet synchronous generator --- sorting networks --- alternating current (AC) motor drive --- space vector pulse width modulation (SVPWM) --- open end winding motor --- minimum voltage injection (MVI) method --- transmission line --- shift method --- genetic algorithm --- electric vehicle --- active filter --- NPC/H Bridge --- battery energy storage system (BESS) --- digital controller --- neutral-point-clamped (NPC) inverter --- motor drive --- hybrid modulated model predictive control --- level-shifted PWM --- optimal output voltage level --- Phase Disposition PWM --- open-end winding configuration --- modular multilevel converter --- multilevel power converters --- simplified PWM strategy --- MMC-MTDC --- tolerance for battery power unbalance --- three-level neutral point clamped inverter (NPCI) --- real time simulator --- harmonic mitigation --- reverse prediction --- multilevel inverters --- field-programmable gate array --- current reconstruction method --- digital signal processors (DSP) --- three-level boost --- multilevel converter --- improved PQ algorithm --- low-harmonic DC ice-melting device --- PV-simulator --- total harmonic distortion --- voltage balancing --- Sub-module (SM) fault --- DC–DC conversion --- smart grid --- Cascaded H-bridge multilevel inverter (CHBMI) --- dynamic reactive --- field-oriented control --- capacitor voltage balancing --- energy saving --- high reliability applications --- three-phase inverter --- substation’s voltage stability --- three-level boost DC-DC converter --- power quality --- T-type converter --- voltage source inverter --- state-of-charge (SOC) balancing control --- multi-point DC control --- predictive control --- Differential Comparison Low-Voltage Detection Method (DCLVDM)