The voltage quality is one of the most important parameters in the power system, and it affects the quality of the power in a variety of ways, including supply voltage interruptions and voltage fluctuations. A conventional DVR needs a big and heavy series transformer even for a three-phase low-voltage system, which is rated up to 400 V to boost the inverter output voltage. Power electronic engineers have developed high-frequency isolated DC-DC converters as a result of the introduction of advanced semiconductor devices and magnetic cores to boost the low magnitude of DC voltage. This study describes a three-phase six-level (TPSL) inverter-based dynamic voltage restorer (DVR) that employs a newly designed isolated multi-port interleaved flyback converter (IMPIFC).

This paper proposes a novel double-stator linear-rotary switched reluctance motor (DSLR-SRM), which achieves decoupling of the magnetic circuit between the linear unit and the rotary unit, and has a higher power density. Then, equivalent magnetic circuit modeling is performed on DSLR-SRM and the correctness of the model is verified. Finally, the dimensions of DSLR-SRM are optimized to enhance the torque and force output via TOPSIS decision-making.

This article proposes an adaptive feedback regulation method for wireless power transfer (WPT) systems, which can be applied to solve the problem of the drop in input voltage from the emergency power supply such as a battery-based source.

This paper proposes a fractional delay (FD) Newton structure for Lagrangian interpolation in single phase grid integrated photovoltaic (PV) system. The structure has been designed for achieving shunt compensation and as a phase locked loop circuit for synchronization. The designed controller performs multiple tasks of feeding the active power to meet the load demand and simultaneously providing reactive power compensation, power factor improvement, and compensating other power quality voltage and load current harmonics. Further, synchronization poses a severe challenge in integrating the PV power electronic converters to the grid. The FD filter is used to discretize the continuous time signal at any time instant using interpolation algorithm employing the non-integral value of the sampling rate delays. The FD delay filter is made adaptive and self-learning by using least mean square algorithm. The designed synchronization technique meets the objective of faithfully tracking the phase of the grid voltage under all grid disturbances such as under voltage, overvoltage, frequency variations, and phase angle disturbances in a precise manner.

To address the issue of diagnosing faults in active power factor correction (APFC) power supplies, this paper conducts an analysis of the waveform characteristics of power supply fault signals. Time–frequency fusion fault features of the APFC power supply in different fault modes are then extracted and constructed, followed by feature optimization. This paper proposes the SOA-KELM model of the APFC power supply, which utilizes feature vectors to classify faults, ultimately achieving hard and soft fault detection of the power supply.

In order to give full play to the characteristic of power sources in the HESS, a wavelet transform-based real-time EMS framework is proposed, which ensures the battery cannot be negatively affected by high frequency and peak currents to extend battery lifespan. A prediction model consisting of four neural networks is proposed to enable real-time application of wavelet transform-based EMS. Four neural networks are trained by different power component data obtained from wavelet transform decomposition, and they can predict demand power of different frequencies online. Based on the HESS models established at different temperatures, the WTFLCS is further verified through the simulation experiment at 10°C, 25°C, and 40°C to prove the robustness against temperature.

A grid-tied single-phase, complex kernel risk-sensitive p-power (CKRSP) algorithm controlled distribution static compensator (DSTATCOM) is presented. The proposed system ensures adequate power quality per IEEE 519-2014 standards during dynamic and weak grid conditions. The experimental analysis given in the manuscript verifies the results obtained in the MATLAB Simulink environment.

With the switch sharing and inductor multiplexing technologies at the same time, the proposed single-stage triple-output Cuk PFC converter utilizes only single-stage converter to achieve PFC function, flicker-free with low twice line frequency LED current ripple, and independent current regulation for triple LED strings with different forward voltage.

Complete block diagram representation of SOC estimation and correction strategy for improved particle swarm optimization-backpropagation neural network-dual extended Kalman filtering (PSO-BPNN-DEKF) is shown below.

This paper proposes a novel dual-mode five-level with common-ground feature. The topology has reduced number of switches compared to its counterparts and presents the ability to operate as step-up or step-down aggregating flexibility to the system in terms wide input voltage range.

In this paper, to realize fast current tracking control and disturbance suppression of EAST fast control power supply, a gain adaptive SMO combined with the DISMC with high-order terms structure is designed and an improved gray prediction based on new information priority is proposed.

The contributions of this work are as follows: maiden attempt of performance comparison of tie-line power exchange incorporating VFT and HVDC power flow controllers and testing an intelligent controller for VFT and HVDC that helps in power flow regulation with acceptable performance characteristics over a very wide range of system disturbances.

To address the problem of converters, simply focus on improving their frequency support potential without considering the availability of remote side AC system sufficient inertia and primary frequency regulation response resources. Thus, we propose a method to quantitatively determine the virtual inertia and droop parameters for the receiving-end converters.

In this paper, a new generalized floor function single carrier-based modulated model predictive current control technique (FF-SC-M2PC2T) has been proposed and it provides an excellent dynamic response. This algorithm implementation does not need computational algorithms, no additional if-else control loops are required and it allows constant switching frequency (CSF) of operation. This technique is suitable for all one-phase switched capacitor-type multilevel inverter (MLI) topologies.

PV model sends V and I current values to the proposed algorithm in (A), then proposed SRCA (stretching, repulsion, and ChOA algorithm) algorithm finds optimum value of duty cycle with respect to the known V_mpp, I_mpp and sends to the converter in (B), finally based on the duty cycle value optimimum GMPP output is tracked in (C).

The proposed converter reduces the number of diodes used for rectification, compared to full-bridge rectifier or reduced bulky center-tapped transformer compared to full-wave center-tapped rectifier and ensures zero voltage switching (ZVS) of the power switches which improves the efficiency of the converter.

In this paper, we propose a gm/ID-based method for the design space exploration of multistage operational amplifiers (Op Amps). By introducing a sampling technique while taking advantage of the device grouping property with gm/ID, it is possible to explore the circuit performance boundary by combining approximate symbolic modeling and gm/ID table lookup. Due to the introduction of a fast performance evaluation method, a large ensemble of circuit sizing samples can be evaluated in parallel, by which an efficient data mining procedure could be incorporated to deduce the circuit samples that can achieve extremal performance at Pareto boundaries.

This paper addresses the global asymptotic stability and strong passivity analysis of fourth-order nonlinear and time-varying dynamical systems by utilizing the Lyapunov direct method. The mathematical model of the main system is obtained from a non-linear and aging RLC circuit. RLC circuits play an excellent role in the stability of modern system theory since they provide suitable stability properties.

The Poincaré–Andronov–Hopf bifurcation theory shows that the oscillator system has a stable limit cycle in three-dimensional phase space.

The omnidirectional Rx is composed of the quadrature double-D (DD) coils and circular coil in series (C2DD). The C2DD Rx can utilize the toroidal magnetic field (TMF) and the linear magnetic field (LMF). The C2DD Rx can receive maximum transmission power of 7.1 W with maximum transmission efficiency of 59%.

The proposed PGME-3/NGME-3 consists of three MOSFETs and can be operated at 5 GHz. The PGME-3/NMGE-3 can be configured as grounded or floating analog memristor emulator (AME). The step time of PG-IMP (i.e., material implication circuit) based on PGME-3 and NGME-3 can be suppressed to 70 ps.

The proposed non-isolated converter topology can generate positive buck and boost outputs and also a negative output using a coupled inductor. Only three switches are used which can independently control all the three outputs without any cross-regulation by direct analytical estimation of the duty cycle in DCM.

A new synthetic floating simulator topology is proposed which realizes lossy parallel inductance (R-L), lossy parallel capacitance (R-C), lossy parallel C-D, and lossless floating capacitance multiplier (FCM) circuits using only three current feedback operational amplifiers (CFOA) as active elements and three impedances. In all the presented circuits, the value of L, C, and D is independently controllable through a single resistance without requiring any matching condition for passive elements. A novel feature of the proposed circuit involves a straightforward adjustment in the CFOA connections, allowing the circuit to function as either a floating lossless immittance simulator or a floating series-type lossy immittance simulator. Various application examples of the presented circuits such as lead compensator, lag compensator, first-order high-pass filter, and fourth-order Butterworth filter are also given to justify the theoretical analysis. To validate the workability of the proposed circuits, several analyses are conducted, including frequency analysis, transient analysis, Monte-Carlo analysis, and temperature analysis, using the macro-model of AD844 in the SPICE simulation tool. Experimental results of the parallel R-L simulator and application examples are also provided using commercially available IC AD844-type integrated CFOAs.

In this paper, two cut-set matrix (CSM) methods, including fundamental cut-set (FCS) and independent cut-set (ICS) matrix methods, are proposed to efficiently obtain the frequency response analysis curves of the lumped parameter equivalent circuit model of a three-winding power transformer. The calculation time of these two CSM methods and node voltage matrix method is compared. The results show that ICS method has the shortest running time and it is more suitable to be selected when calculation efficiency is considered as a key indicator.

Analysis of NGD circuits in fractional domain is conducted based on the novel Caputo–Fabrizio derivative-based fractional impedance. We have found that considering these NGD circuits in the fractional domain, which effectively taking unavoidable nonidealities into account, significantly reduces their operating frequencies yet they can retain their NGD functions.

Graphical abstract text: In this paper, multiple inverter system based on the SPHFRI is described, and the circulating currents existing in the system have been analyzed and derived from two aspects: (1) magnitude and phase angle and (2) active and reactive currents. The topologies and modulation strategies of SPHFRIs used in multiple inverter systems have been reviewed and simulated in MATLAB/Simulink. Through the simulation results, the performance of different multiple inverter systems for suppressing the circulating current is compared in two situations: (1) with magnitude discrepancy only and (2) with both magnitude and phase discrepancy. Finally, the advantages and disadvantages of each inverter are summarized, and the state of the art and future trends are presented.

This work presents a deterministic current control algorithm using digital average current mode (DACM) to manage hybrid battery/ultracapacitor energy storage systems in electric vehicles (EVs). It restricts battery discharge current within its maximum safe limits, extending battery life, and ensures safe long-term operation. Experimental results validate the effectiveness of the algorithm and dynamic current sharing.

The proposed work presents a novel positive and negative compact impedance multiplier and inductance simulator using VCII.