In this paper, novel and efficient analytical closed-form expressions are proposed for the optimal allocation of multiple capacitors in distribution systems to maximize the total cost reduction (CR) while considering power losses. The proposed expressions are novel since they can directly solve the allocation problem without requiring iterative processes or optimization algorithms. Specifically, two

Finding the fault location in distribution network is difficult in comparison to transmission network based upon high branching and high impedances composed of the contact with environmental factors when a fault occurs. For this matter, the possible faulty section is identified and then the fault location is determined with the proposed algorithms in this study. Wavelet transform is applied to the

This paper presents the performance of a renewable autonomous hybrid grid composed of photovoltaic system, wind turbines, hydrokinetic turbines, diesel generator and energy storage systems. Three energy dispatch control and several storage systems have been studied. Technical, environmental and economic indicators have been used to determine the impact on the hybrid autonomous grid and its sizing optimization

In this paper, a method to control the harmonic content of the magnetic flux density in the airgap of a synchronous machine is presented. Voltage harmonics in one phase as well as the exciting magnetic forces can be affected. Switched power electronics were used to provide the field current to a synchronous machine, the control added specific current harmonics to the DC field current in order to minimize

The power systems become operate closer to loadability limits; hence, the power systems static voltage stability assessment becomes an essential task in planning and operating for electric power systems to prevent voltage instability. In this paper, the improved moth flame optimization (IMFO) technique is applied for optimal location and size of (TCSC) with the aim of reducing load shedding, preventing

Active magnetic bearing consists of different parts, an actuator being the essential part of that. Depending on construction, electromagnetic power in various actuator structures is unique. This paper offers an experimental description of the study using simulation and evaluation of an I-type single-axis active magnetic bearing. The test will be carried out with multiple air gaps in simulation and

The purpose of this research work is to solve the multi-objective optimal power flow (MO-OPF) problem using non-interactive approach. In this approach, the decision maker (DM) is not involved; however, the prior preference information is available to the DM. A satisficing function is offered to take care of the conflict between non-commensurable objectives, and the multi-objective problem is reformulated

Series–parallel connected Li-ion battery string is an inevitable component of electric/hybrid electric vehicle (EV/HEV). One of the common concerns of battery system is charge imbalance among the series connected batteries, which leads to over voltage/under voltage stress, reduced cycle life and even fire hazard. To overcome these issues, various cell balancing circuits have been developed during the

Increasing the generation of renewable energies to reduce the consumption of fossil fuels that produce high concentration of greenhouse gases is the priority that several governments have set for themselves in the medium term. In this paper, the modeling of a solar thermal energy generation plant is carried out. The climatic data correspond to two coastal cities and an island in Ecuador. The main contribution

Refurbishing electrical machines to have a higher performance and/or reliability is a clear trend in the circular economy. This paper investigates the gain in efficiency, torque density and reliability with replacing the windings and the iron of the stator of existing three-phase synchronous reluctance machines (SynRMs), resulting in a multiphase machine. The stator housing, shaft, bearings and the

This work presents a system and method to improve transmission quality in smart meter networks that use Modbus-RTU. Energy management systems in industries, buildings and urban infrastructure use smart meters interconnected in a network. These systems can demand a great quantity of interconnected devices, which sets down increasing requirements to communication networks in terms of transmission quality

In nuclear and chemical fields, canned motor pumps are one of the safest ways to pump dangerous fluids. The canned motor pump is a compact unit integrating a hydraulic part and an induction motor with a common shaft. The particularity of the motor is that two non-magnetic cans are inserted in the air gap for leak tightness reasons. This study is therefore motivated by the fact that on one side classical

Metal-oxide surge arresters (MOSAs) play an important role in preventing outage situations and thus in preserving the reliability of electric power system. So far, many MOSA monitoring methods have been developed. These methods propose different indicators that are more or less reliable in MOSA monitoring and diagnostics. Another important aspect of these indicators is that each one of them can be

Compared with the single-phase wireless power transfer systems, the three-phase wireless power transfer systems have the advantages of large transfer power, high position offset tolerance, and small output ripple, etc., which have been widely used for high-power application. For a three-phase rail-type dynamic wireless power transfer system, the interphase cross-coupling mutual inductance, will lead

Management of the electrical grid has an importance on the sustainability and reliability of the electrical energy supply. In the process, it is still crucial that power quality (PQ) is evaluated as part of any grid management master plan. This article provides a novel approach for classifying PQ disturbances such as voltage sag, swell, interruption and harmonics. In the proposed method, colorized

In the presented study, we consider several methods to measure high-voltage, nanosecond-duration electrical pulses, and their implementation for understanding the applied voltage, current, incident, reflected, and power at a load. We examine different probes for the most common transmission line types used in high-voltage pulser’s output, present their strengths and weaknesses, and give recommendations

This paper proposes a stochastic scheduling approach for AC/DC hybrid distribution system considering the output uncertainty of wind and photovoltaic. The energy coordination problem has been formulated as a two-stage resource scheduling problem. The first-stage decision produces an hourly day-ahead pre-scheduling plan for the dispatchable distributed generators. For a set of possible scenarios over

We provided parity-time symmetry (PT symmetry) for a magnetic resonance wireless power transfer (WPT) system designed to operate below 20 kHz. A lightweight coil having a mass of 39.1 g and consisting of a Mn–Zn ferrite core and 0.6-mm-diameter copper wire is considered herein. The coil had a Q factor of 111.5 at 16.5 kHz. The proposed system oscillated at 16.5 kHz for a transmission distance of 15 mm

In this paper, current-mode boundary conduction mode (BCM) of a high-efficiency LED driver with high power factor, utilizing low-voltage film capacitors, is presented, and its theoretical design and considerations are discussed. The 1.5-stage driver consists of a forward-flyback and buck converter. Higher efficiency was reached using the reduced redundant power processing approach. Most of the processed

It can be concluded from the results of the previously published studies that the dual-stator consequent-pole Vernier PM machine introduces several advantages including higher torque per PM volume density, lower cogging torque, improved efficiency and simpler and more robust structure in comparison with the other presented structures. However, the optimal design procedure of the machine is not established

The development of the renewable energy and the need of medium- and high-voltage direct current circuit breakers are the keys in the development of medium- and high-voltage transmission systems. It can be used in high-voltage systems as cascaded interrupters. In this paper, the cascaded interrupters of gaseous circuit breakers are simulated using black box arc models. The influences of the models parameters

This paper introduces a new partitioned ant lion optimizer (PALO) strategy to improve the solution accuracy and quality of the optimal power flow (OPF) considering multi Static VAR Compensator (SVC) and Thyristor Controlled Series Controller (TCSC)-based FACTS devices. An interactive partitioning structure-based ALO is proposed to improve the solution of OPF by creating an interactive equilibrium between

A generalized symmetrical multilevel inverter (MLI) topology with an essential feature of smooth commutation during the dead time for inductive loads is presented in this paper. It consists of a level generation unit (LGU) and polarity generation unit (PGU); Both LGU and PGU provide a freewheeling path for load current during the dead time for an inductive load which avoids large voltage spikes across

In this paper, a low-cost high-performance axial flux Vernier machine (AFVM) with soft magnetic composite (SMC) cores and ferrite magnet is proposed, analyzed and optimized. By cooperating with spoke magnet rotor configuration and 3D magnetic flux stator structure, the proposed AFVM can output higher torque compared with the traditional permanent magnet machine though low-cost low-energy-density ferrite

Power generation planning (PGP) is a vigorous stage in power system planning subsequently forecasting the load demand. The nature of the PGP problem is highly constrained, dynamic, discrete, nonlinear, stochastic, and mixed-integer. The amalgamation of the renewable energy sources in strategic PGP generates the complexity in terms of feeble reliability because of variability. The meta-heuristic algorithms

Cogeneration systems have gained prominence in recent years driven by the simultaneous systematic production of heat and electricity, which are involved in industrial and commercial processes. Sugar and alcohol industry has become a reference in the use of cogeneration through the burning of sugarcane bagasse, with an important role in the future policies for generation expansion in Brazil. However

This paper proposes a two-stage framework to solve the long-term transmission network expansion planning (TNEP) problem ensuring user-defined reliability levels and wind curtailment over the planning horizon. In the first stage, the static TNEP (S-TNEP) problem is solved to define where a set of new lines must be installed at the end of planning horizon. In the second stage, a multistage procedure

This work investigates the establishment of steady-state eddy currents in solid and laminated salient poles and rotor rim of synchronous machines due to a periodic excitation voltage. It shows that the presence of eddy currents in the rotor magnetic circuit has the double effect of increasing the excitation winding AC-resistance and decreasing its magnetizing AC-inductance. According to that a simple

In the plant protection drone wireless power transfer system, the positional deviation of the transmitting coils and the receiving coils will cause the efficiency of wireless power transmission drops. In view of this problem, an anti-offset constant current wireless power transfer technology by adjusting the duty cycle of the secondary side buck circuit is proposed in this paper. By establishing a

Battery and ultra-capacitor (UCp) combination forms the multiple energy storage model (MESM), which provides the optimum benefit to hybrid electric vehicles/electric vehicles (EVs) for its successful operation. The inherent high power density characteristic of UCp is used during starting and momentary periods of EV. On the other hand, the battery provides the average power to the EV, during the steady-state

A design procedure for an RLC damping branch applied at a voltage source inverter followed by an LCL output filter is carried out in this paper. The main purpose of the proposed methodology is to allow the system to operate properly in both grid-connected (GC) and islanded (IS) modes with smooth transitions between them. The usage of passive damping methods to smooth the resonating filters effects

Radio frequency (RF) energy harvesting as an alternative energy source is an emerging technology that supplies energy for low power wireless devices. In this study, the impacts of RF sources, antenna gains, output power levels and path losses on charging times of an RF energy harvesting system were measured and analyzed in detail. An advanced measurement system that consisted of RF sources used as

A sensorless speed estimation method for performing the indirect field-oriented control (IFOC) of induction motors (IMs) is presented in the current research. The method uses the stator voltage as state variable but eliminates the voltage transducers. Traditional MRAS methods use two sets of equations to estimate the motor speed. However, the proposed system utilizes the q-axis current regulator p

The number of inverter-fed motors is increasing due to the good controllability of the motor and the meanwhile low acquisition costs. As a result of the discrete switching states of the power transistors, the average of the three output voltages of a two-level inverter is a common mode voltage, which differs from zero. The common mode voltage is impressed into the motor winding by the inverter, and

In this paper, optimal power flow problem has been implemented and evaluated simultaneously with the emergency demand response program (EDRP), considering the economic and environmental aspects, as well as the voltage stability enhancement of power system. Moreover, employing DRPs is a way to control customers’ electric energy consumption and to improve network reliability. The EDRP is one of the various

The aim of this paper is to quantify the evolution’s effect of parallel electrical discharges on the performance of a plane insulation placed simultaneously under conditions of a non-uniform transversal distribution of pollution and positive DC voltage. The results emanating from this experimental study revealed a maximum increase about 18% of flashover voltage of insulation’s non-uniform transversal

A new transformer-less boost-based DC–DC converter is suggested in this research. The voltage gain of the proposed converter is enhanced employing a charge-pump circuit (CPC) and n-stages of voltage multiplier cells (VMC). Each VMC consists of one inductor, one diode, and two capacitors. As the number of these VMC stages (n) increases, it is feasible to achieve high voltage gains with low duty cycles

Twice ripple power exists in single-phase to three-phase reduced-switch induction motor drives, which degrades the performance of the drive system, such as larger total harmonic distortion of the grid current, the larger ripple voltage in the dc link and the larger torque ripple. Most existing power decoupling schemes are open-loop decoupling methods. However, the open-loop decoupling method has the

A numerical one-step method of average voltage values in integration step, which allows to algebraize the differential equations for electric circuits of electromechanical systems with semiconductor converters, was described in the paper. The method is proposed for the creation of digital power circuit real-time models of electrical systems in hybrid models that combine digital and physical components

In this paper, we present a new approach to protection of double-circuit transmission lines using modal transformation. The current differential principle is applied in the modal domain, and the relay characteristics are plotted in the alpha plane for numerical differential protection applications. Synchronized voltages and currents from both the ends are transformed to modal values. The transmission

Pulse-voltage and pulse-current methods are widely used in advanced battery charging systems, because they enhance the overall charging process and prolong the battery lifetime. This paper proposes two battery charging systems for an electric vehicle charging station based on these methods. The first design is a developed version of a studied non-dissipative pulse-current DC–DC stage in which the negative

The number of inverter-fed motors is increasing due to the good controllability of the motor and the meanwhile low acquisition costs. The steep voltage slopes of the converters lead to an uneven voltage distribution along the winding and thus to voltage peaks between the conductors, which stresses the insulation. The voltage distribution can be predicted by means of equivalent circuit diagrams, which

In today’s scenario, frequency regulation is the main concern in islanded microgrids (MG). This concern of frequency in MG can be sorted out in various ways. Several authors have used different strategies to support the MG’s frequency. Handshaking of charging stations (CS) among each other through proper control mechanism can be one of the approaches to sort out fluctuation of frequency in MG. In this

Vernier permanent magnet (VPM) machines have been widely used in the last two decades due to their high torque density resulting from their magnetic gearing effect. In this paper, we present a new design of VPM machine with higher efficiency and power/weight ratio than their conventional counterparts. The proposed design is a combination of discrete-pole and hybrid-pole VPM machines, which incorporates

Electrical breakdown voltage (VBD) and streamer propagation path characteristics in highly non-uniform electrode system were investigated to clarify the dielectric barrier effects. The experimental results showed that VBD is affected by both the barrier dimension and the barrier position. As the position of the dielectric barrier becomes closer to the needle electrode, the rising rate of VBD according

Sulphur hexafluoride (SF6) has been the most commonly used gas in the electrical industry since 1960s. Due to the high environmental hazards reported by using SF6, the research on to investigate alternative gaseous insulation has become demanding research in high voltage engineering. The refrigerant gas chlorodifluoromethane (CHClF2) with low global warming potential and stable chemical properties

The magnetization of rare earth ring magnets forming the rotor of a BLDC or a synchronous motor requires a high level of magnetization field to achieve the desired magnetization pattern. The design of the magnetizing yoke is a compromise between the field strength requirements, the yoke temperature balance and the winding forces. The two-pulse magnetization allows reaching a higher steepness of magnetization

The increased usage of nonlinear loads in electric systems has dissociated the voltage and current signals from the ideal sinusoidal form and, as a consequence, the traditional power calculation is no longer satisfactory. Several power calculation theories applied to nonsinusoidal signals have been proposed; however, there is no general agreement among them. This paper is inserted in this context,

This paper presents a photovoltaic (PV)-interfaced dual-drive hybrid electric vehicle (PV-DDHEV) based on dual boost three-port DC–DC converter to increase the fuel efficiency of the electric vehicle by increasing the conversion efficiency of the converters. HEV designed with the photovoltaic (PV) power system requires a DC–DC converter to enhance the PV array output voltage to the level demanded by

In this paper, a wireless charging system and a human body model with various operating frequencies and output power are constructed to study the safe distance between the human body and the charging system when the electric vehicle is wirelessly charging. The models are simulated for electromagnetic fields and electromagnetic thermal effects. This paper mainly focuses on the induced electric field

Intelligent fault diagnostic systems are fast becoming key instruments in industrial applications. This paper presents a recognition system for diagnosing bearing defects in induction motors. The proposed scheme is comprised of five steps, namely signal segmentation, feature extraction and reduction, fault classification and the decision fusion. First, the vibration signal is segmented into successive

Polymeric or silicone rubber insulators are extensively used for high-voltage transmission by electrical utilities due to advantageous features like lightweight, better contamination performance, etc. The performance of silicone rubber insulators exposed to low temperature conditions with continuous application of electric stress is of utmost importance as these insulators are being used under such

Focusing on the output voltage reduction caused by variation of the equivalent coupling capacitance in capacitive power transfer (CPT) system, this paper proposes a hybrid control strategy to achieve constant output voltage with the variation. The hybrid automata model is introduced for the cascaded CPT system considering the characteristics of higher order, nonlinear, multi-mode, continuous time and

Shading of photo-voltaic panels is one of most common reason for power reduction in practical scenarios. This also causes multiple maximum peaks, thereby resulting in distortion of characteristic curves. In order to overcome the effect of shading, reconfiguration of panels is essential. In this work, the Chaotic Baker Map is proposed to reconfigure the panels in Solar Photo-Voltaic (SPV) Array. The

The poor management of hotspots in electrical systems often leads to very devastating consequences; an extremity is fire outbreak which could result in loss of lives and/or properties. Hence, the necessity to effectively manage or handle electrical hotspots cannot be overstated. This paper proposes a model for arresting the occurrence of the destructive activities of electrical hotspots in industries

This paper presents a new adaptive water cycle algorithm (AWCA) to optimize the controllers operation in a multiple distributed generators (DGs)-based microgrid. The inconsistent nature of renewable-based DG creates several challenges to stability margin of microgrid. The proposed AWCA improves the stability margin and transient profile of multi-DGs-based microgrid during various bounded/unbounded

Wind power project development investment is based on the separate technical and financial analyses. Based on the actual wind data, data-based wind distribution map and wake effect model, a combined techno-economic analysis is proposed in this paper. Starting from deriving the wind distribution map, a comprehensive analysis extending to the feasibility assessment of the project is presented here. The

This paper presents an open-source Simulink-based program developed for simulating power systems integrated with renewable energy sources (RESs). The generic model of a photovoltaic, wind turbine, and battery energy storage is used for the RES. The program can be used for educational and research studies. It comes with several important subjects in power systems including power system modeling and

In recent years, the installed power capacity of renewable power plants has been increasing because of the technological developments, industrialization and rapid population growth. This case has led to the extension of electric transmission networks. Extending transmission networks, on the other hand, means the long transmission lines and line losses. The efficient control of electricity transmission

Hybrid electric vehicles (HEVs) and pure electric vehicles (EVs) rely on energy storage devices (ESDs) and power electronic converters, where efficient energy management is essential. In this context, this work addresses a possible EV configuration based on supercapacitors (SCs) and batteries to provide reliable and fast energy transfer. Power flow among the aforementioned energy sources and the EV