A Defining component that has made the IEEE Journal of Emerging and Selected Topics in Power Electronics (JESTPE) a predominant publication in the field of power electronics is our past and current associate editors. Although our associate editors are largely unknown and unheard until a paper they recommend for publication appears in print, their work is of extreme importance in producing the IEEE

DC microgrids have higher efficiency, better current carrying capacity, and faster response compared to the conventional ac systems. They also provide more natural interface with many types of renewable energy resources (RERs) and energy storage systems (ESSs), as well as better compliance with consumer electronics. These facts lead to increased applications of dc microgrid-type power architectures

In this paper, a proper duty cycle control method is proposed to reduce torque and flux ripples and harmonic loss in direct torque control (DTC) of six-phase induction machine (6PIM). Three different methods are proposed to improve the performance of switching table DTC for 6PIM. First, by the suitable selection of two vectors in each sampling period, the harmonic amplitude is significantly decreased

Clamp mode resistor capacitor diode (CMRCD) snubbers have a simple and easy implementing structure. They have been widely adopted in the pulsed power supplies to provide a safe operating condition for the series insulated gate bipolar transistors (IGBTs). The main problem of the CMRCD snubbers is their poor performance in the voltage balancing of the series IGBTs. They are essentially overvoltage protectors

A mustard seed planted years ago Sprouts and continues to grow.

Efficient power converters capable of changing their output voltage at very high speeds (submicrosecond scale) are mandatory for very fast response (VFR) applications. They are necessary to regulate loads that demand very fast voltage changes and to supply high-frequency-pulsed loads for data processing, communication, and portable equipment. VFR converters likewise become necessary for applications

This article investigates a novel approach to the integration of multilayer, thin film magnetics embedded in printed circuit board (PCB) for Power Supply in a Package (PwrSip) applications. A solenoid inductor structure is formed by sandwiching a multilayer CZTB magnetic sheet between two distinct PCBs with copper tracks on each which form the upper and lower windings of the device. A solder reflow

The increased switching frequency and speed of silicon carbide (SiC) MOSFETs lead to higher power density of inverters, but meanwhile resulting in weak electromagnetic interference (EMI). The impedance balance technique is a good way to reduce the common mode (CM) noise by making the voltage across the line impedance stabilization network (LISN) as small as possible. However, a side effect of this

The Editorial Board of the IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS (JESTPE) owes a depth of gratitude and appreciation to the authors who got their papers published in the 2019 editions. After an intensely competitive review of nominated papers by the members of the Editorial Board and some Associate Editors, it is a pleasure to announce the winners of the best papers among

Power electronics converters are indispensable parts of modern energy systems for achieving the required flexible energy conversion and transmission functions. The use of power electronics enables energy systems to fulfill critical roles in various utility applications, but at the same time necessitates imposition of stringent requirements for stability and safety purposes. Conventional linearized

This article proposes a control strategy for integrated dc microgrids (MGs) into power systems. In this method, the DC MGs are capable of importing or exporting energy from or to the AC grid based on the loading conditions. The DC MGs employ an interlinking converter (IC) as a bidirectional back-to-back converter for a distributed generator (DG) unit at the point of common coupling (PCC). In a multi-DG

Due to the disparity of power modules, asymmetry of driving pulses and measurement errors of sensors, dc currents may be injected to grid-connected photovoltaic (PV) inverters. The dc current injection may cause magnetic saturation of the power transformers. To solve this issue, this article thus proposes an effective current control strategy and compensation method, which does not require any extra

This article proposes two new pulsewidth modulation (PWM) schemes, namely, asynchronous PWM scheme (APS) and synchronous PWM scheme (SPS), for a nonisolated fourth-order bidirectional dc–dc converter (FOBDC), which are implemented to achieve a smooth start-up operation and mode transition to reverse the direction of power flow. The presented FOBDC is reported already in the literature as a unidirectional

To address the stability issues aroused by the negative-resistance effect of constant power loads (CPLs), this article proposes a composite robust discretized quasi-sliding mode control (DQSMC) scheme for stabilization of buck-converter fed dc microgrids with CPLs. In the outer control loop, a robust DQSMC voltage controller is proposed. First, a discrete integral sliding surface is designed to obtain

In this article, a soft-switched nonisolated high step-up three-port dc–dc converter is presented for hybrid energy system applications. In the proposed converter, the soft-switching condition is provided for semiconductor elements by a passive lossless snubber without adding any extra active switch or adding any additional semiconductor element in the main power path. The proposed converter is a high

This article proposes a new controller for power regulation in dual active bridge (DAB) dc–dc converter based on a new scheme that tracks minimum RMS current to ensure minimum losses. The proposed controller is based on an implementation of perturb and observe (P&O) tracking method that enables minimum current point tracking (MCPT) at any desired level of active power transfer and dc voltage ratio

The dual-active-bridge (DAB) converter is widely used in many applications. When the port voltages are not matched, the switches of the converter are hard to realize zero-voltage switching (ZVS). By introducing different dc voltage offsets across the blocking capacitors, this article proposes a hybrid modulation technique, which makes the converter switch between different working modes to enlarge

Oscillation issues of permanent magnet synchronous generator (PMSG) wind turbines (WTs) have an increasingly significant impact on grid stability, especially with their increased generation capacity. However, the machine-side model (MSM), involving machine-side converter (MSC) and generator, is generally simplified as an ideal voltage source to comprising the impedance model of a PMSG-WT used for stability

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The study of power converters operated at greatly increased switching frequencies compared to conventional practice poses rather unique and transverse challenges to the designer.

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To study the electromagnetic dynamics of grid-connected voltage source converter (VSC)-based devices during asymmetrical grid fault ride-through, this article presents a generic dynamic modeling method for asymmetrical-faulted power grids. In the generic case, the asymmetrical impedances and the grounding inside a faulted grid introduce complicated couplings among the harmonic-contained sequence components

Resonant converters, especiallyLLC converters, are deployed in many applications thanks to their reliability and high efficiency. With the introduction of wide band gap (WBG) devices and the soft switching feature of the LLC converter, the switching frequency of the LLC can be pushed to the order of megahertz, to shrink the converter size and increase the power density. However, magnetic design and

In this work, a novel nonlinear approach is proposed for the stabilization of microgrids (MGs) with constant power loads (CPLs). The proposed method is constructed based on the incorporation of a pseudo-extended Kalman filter (EKF) into stochastic nonlinear model predictive control (MPC). In order to achieve high-performance and optimal control in dc MGs, estimating the instantaneous power flow of

A three-winding coupled inductor connected as a Y-shaped impedance network has been used in dc–dc and dc–ac converters for producing a high voltage gain for renewable applications. Its versatility is further extended in this article by the proposed differential Y-source inverter with two Y-source networks. The proposed inverter is modulated by a half-sine wave, which permits only one coupled inductor

This article presents a cascaded gate driver (CGDA) architecture to improve the switching speed of series-connected power devices. The main idea is to propose a new technique to increase $dV/dt$ of the devices when their voltages are already balanced. In complex power converters such as multicell and multilevel topologies, and series-connected power devices, many driver circuits are required and implemented

In this article, a fault-tolerant topology of a cascaded H-bridge (CHB) converter is proposed for motor drive applications. Usually, multiwinding transformer fed CHB converters are provided with pre-charge windings for precharging the dc-link capacitors. The windings become inactive after the precharging process. The proposed topology contains redundant cells connected to the precharge windings. After

The finite-control-set model predictive control (FCS-MPC) has been widely studied to control voltage source converters (VSCs) due to its fast-dynamic response and robustness. To design an FCS-MPC for a three-level VSC, it is necessary to design a multiobjective cost function, which usually consists of a term dedicated to control the neutral-point voltage (NP-V) of the VSC dc link. Nevertheless, selecting

Voltage of DC microgrid is prone to oscillation, originated from the following three factors: 1) negative damping performance of the DC converter; 2) interaction between the power converter and DC network; and 3) positive feedback (PF) of DC voltage control loop. Analogous to the relationship between the force and velocity of motion, it derives the functional relationship between DC current and DC

Finite control set-model predictive control (FCS-MPC) for the power electronic systems has been implemented using the field-programmable gate array (FPGA), considering an alternative solution to handle the computational burden of the control algorithm. However, FPGA resource utilization is a concern for optimum design and development of the FCS-MPC. This article presents analytical approach-based implementation

Coupled-inductor-based boost converters suffer from high switch current stress in steady state and transient due to less self-inductance value in their winding. In this article, a generalized switch current stress reduction technique is proposed by modifying circuit topology of coupled-inductor-based high step-up boost converter (CIHBC). This is achieved by a half-cycle resonating branch utilizing

This article proposes a novel bipolar-type dc system suitable for both distribution and transmission systems based on modular multilevel series/parallel converters (MMSPCs). The system features decoupled operations of each pole of the bipolar system, being able to operate in both asymmetrical and regenerative modes. This enables two independent dc systems by using a single grid-tied converter. The

This article presents a novel flux-cancellation-based modular multilevel converter (MMC) with power decoupling capability. Conventional MMC suffers from low-frequency (fundamental and second-order) ripple power in the submodule (SM) capacitors. The low-frequency ripple power makes the SM capacitors bulky, responsible for a significant portion of the volume and weight of the whole system. The ripple

In this article, a dynamic zero-voltage switching (ZVS) angle control scheme on the wireless power transfer (WPT) system inverter is proposed by implementing a tuning capacitor. High-frequency (HF) and high-power WPT systems are desired in battery charging applications to reduce the battery charging time. Consequently, the power semiconductor devices are subjected to increased voltage, current, and

The commercial light-emitting diode (LED) epitaxy materials—blue (i.e., InGaN/gallium nitride (GaN) multiple quantum wells (MQWs)) for lighting and display applications and green (i.e., InGaN/GaN MQWs) for display applications—are evaluated with a varied range of temperatures (10–800 K) for future applications in high-density power electronic modules. Six different InGaN/GaN MQW structures (peak wavelengths

The integration of renewable energies based on photovoltaic power plants (PVPPs) is increasing exponentially fast. In consequence, stability problems associated with the lack of inertia are becoming a serious concern. Transmission and distribution system operators are demanding more requirements in PV plants to provide grid functionalities in terms of frequency and voltage support. Therefore, power

In a three-phase four-wire low voltage (LV) distribution system, unbalanced loads lead to neutral current (NC) looping resulting in increase of power losses and variation of neutral potential. Compared to the conventional power transformer, smart transformer (ST) has strict current limitations to avoid overcurrent. However, its advantages on the downstream LV grid voltage regulation can provide the

The dc fault-current-limiting technique is extremely important for operation security and power supply reliability of the flexible dc grid. Generally, the dc reactor can effectively limit the dc fault current; however, it will result in negative influences on the system operation stability and dc circuit breaker (DCCB) isolating speed. The hybrid current-limiting circuit (HCLC) can effectively cooperate

Power quality improvement of power electronics systems in many applications such as adjustable speed drive (ASD) is vital due to the high penetration of grid-connected converters in distribution networks. Conventional diode bridge rectifiers are widely utilized in three-phase systems due to their cost-effectiveness, simplicity, and reliability. To improve their harmonic behavior, in this article, a

This article proposes a four-degree-of-freedom overmodulation strategy for five-phase space vector pulsewidth modulation (SVPWM) in order to reduce the low-order harmonics of the output voltage during overmodulation. Based on the nearest-four-vector SVPWM algorithm, this overmodulation strategy calculates the corresponding third harmonic injection rate according to the modulation ratio in the overmodulation

High-frequency dc solid-state transformer (DCSST) plays an important role in DC bus connection, voltage conversion, electrical isolation, and bidirectional power transmission in dc distribution networks. In various DSSCT topologies, the dual-active-bridge (DAB) scheme becomes a typical solution for DCSST due to its various advantages. However, the DAB scheme still has drawbacks during practical applications

A semiphysical semibehavioral analytical model for switching transient of silicon carbide (SiC) MOSFET power module is proposed in this article. The model is developed for the applications in design automation where the tradeoff between accuracy and efficiency is important. The estimation of switching losses and voltage/current overshoots is mainly concerned in the proposed model. The switching transient

Electric vehicles (EVs) that offer grid services using the vehicle-to-grid (V2G) concept essentially require an interface that allows for directional power flow. This article presents a wireless bidirectional grid power interface for EVs that facilitate power flow between the grid, EV, and homes with nonlinear loads. The proposed wireless vehicle-to-grid-to-home power interface (WVGH-PI) uses the grid-side

A novel nonlinear method of analysis is deployed in detail with the aim to design suitable controllers with guaranteed stability for grid-connected photovoltaic (PV) systems driven by power converters. By this method, all the system nonlinearities are considered in order to allow a reliable analysis in a wide range of operation and to avoid instabilities that as shown in this article can be occurred

Coupled-inductor buck–boost dc–dc switching converter has emerged as an alternative to manage power in several hybrid system architectures. This is due to features such as a noninverting voltage step-up and step-down characteristic, high efficiency, wide bandwidth, and the possibility to regulate its input or output currents as has been reported in previous works. All of them are based on a small-signal

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The past years have seen a remarkable growth of inverter-based resources in power grids. Conventionally, the inverter-based resources are controlled as current sources, following the phase of grid voltage, with the assumption that the grid voltage is stiff or slightly affected by the current injected from the inverter. This operation mode is commonly known as the grid-following (GFL) or grid-feeding

Complex space vectors have for decades proven their usefulness for modeling, analysis, and control design in electric power engineering. One fundamental benefit is that they allow two variables—the d and q components of the vector—to be expressed in a single-input–single-output (SISO) notation. Symmetric three-phase systems and dynamic elements can be modeled using complex-coefficient transfer functions

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As core components of power converters, the insulated gate bipolar transistor (IGBT) module is required to have long-term reliability in increasingly more applications. To assess and improve the reliability, power cycling (PC) tests are conducted to determine the lifetime of IGBT modules; these tests are very time-consuming and may take a couple of weeks or even months for a single sample. Therefore

This article presented a new structure for the grid-connected multilevel inverters (MLIs) circuit with the ability of the cascaded connection. The proposed inverter is capable of transformerless connection of distributed generation resources to the network. The control system manages the power injection to the grid by minimizing the output current harmonics as well as exchanging reactive power with

To improve the tracking performance of the speed controllers of permanent-magnet synchronous motor (PMSM) drive systems with different disturbances, such as internal parameter variations and external load changes, a novel extended-state-observer-based sliding-mode speed control (ESO-SMSC) scheme for PMSM drives is proposed in this article. First, a fast-response SMSC is designed based on the upper

The load-side virtual synchronous machine (LVSM) enables the load to actively participate in the grid regulation, but it might still induce oscillations in a weak grid. Considering the dc-link voltage controller, power loops, ac voltage and current loops, the control delay, and sampling filters, the wideband dq -frame impedance model of the LVSM is first established, and it is found that $Z_{dd}$ exhibits

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We Have witnessed that each generation of power devices triggered a renovation in power conversion in the past decades. Wide bandgap (WBG) power devices,as the new generation of power devices, will undoubtedly make great changes to today’s power conversion system. Actually, they are now establishing new benchmarks in various applications benefiting from their higher switching frequency,higher power