In this paper, a system for controlling the energy flow of vehicle with multiple energy storages which are used for increasing performance and driving range is presented. For achieving maximal performance and efficiency of energy flow control, traction profile of the route is necessarily known. For observation of a traction profile, Global Navigation Satellite System is used. For energy flow control

Brushless DC motor has specifications such as high efficiency, high startup moment and silent running. Thanks to its low inertia, high torque/size and power/size ratio, it can be used in specially designed vehicles such as electric vehicles (EVs), spacecraft and submarines. As there is no brush and commutator that in its structure can cause arc forming, it can be used in fire-sensitive areas. In this

Transient stability assessment involves the determination of whether all generators in the power system would maintain synchronous operation when it is subjected to a large disturbance. Assessing the transient stability status of a power system in an accurate and timely manner is of high importance in order to plan and initiate relevant corrective control actions where required. The wide-area monitoring

Recently, more and more unmanned aerial vehicles (UAVs) have been used in industry, public services and commercial fields. However, the UAV is generally limited by the battery capacity, and the operation radius is greatly limited. In this paper, to increase the flight time of the UAV, the recharging station by using wireless power transfer technology is proposed. A new receiver magnetic coupler is

The voltage stability margin is an important load margin measure used in power system operating centers to prevent a voltage collapse. However, oscillatory problems that arise with increasing load can also compromise the performance and stability of the power system. Thus, it is essential to determine a load margin that meets the requirements for voltage stability and small-signal stability in dynamic

Control of power electronic converters is an application area where system identification is necessary due to the implementation of suitable controllers. Thanks to the identification process, it is possible to obtain a suitable mathematical model of the converter, which can be used for the design of its control. This article deals with the design of a new recursive–iterative identification method applicable

Cross-linked polyethylene (XLPE) is employed in high-voltage transmission cables, due to their distinguished insulation performance. Localized degradation due to AC voltages is a major cause of damage in these systems. These damages known as electrical trees vary in their shape and characteristics according to the cause of damage. This paper discusses the effect of lightning overvoltages in trees formed

This research work is aimed at the modification of in-wheel switched reluctance motor (Outer rotor-type SRM) with minimized torque ripple for electric vehicles. The geometry of stator and rotor poles affects the torque. Variation in the stator and rotor pole geometry causes change in the torque profile. To reduce the torque ripple and to increase the average torque, modification in the stator and rotor

Many researchers presented the theoretical analysis of the doubly fed induction generator (DFIG) based wind turbines, while the experimental setup is more valid but remains a big challenge. Besides, wind power systems' most significant problem is how to get the most valuable energy with different wind speeds. Using wind speed sensors is a challenging operation in wind turbines due to the complicated

This paper presents a hybrid AC/DC microgrid consisting of multiple distributed energy sources, modeled in MATLAB/Simulink environment that undergoes islanding and non-islanding (symmetrical and unsymmetrical Faults) disturbances. These disturbances result in various changes in circuit parameters (voltage, current, and frequency) and this paper focuses only on disturbed current signals that are extracted

Safety of electric power systems depends heavily on distribution of electric field in high-voltage switchgear. Switchgear failure can lead to fatal disasters in important systems. It is necessary to evaluate electric field and insulation performance for high-voltage switchgear in key systems. In this paper, considering a high-voltage switchgear system designed for nuclear power station, a three-dimensional

This article addresses the benefits of novel dual rotor machine for automobile sector. In case of traditional electric vehicle technology, the vehicle has a single rotor electric machine that can able to perform motoring or regenerative operation and can be possible according to the energy available in the battery. To overcome the above-mentioned problem, novel electric machine design topology with

Dissolved gas analysis is the most common and well-established method used in identifying internal faults of power transformers. However, an onsite analysis using this method accuracy still need to be improved while the laboratories analysis process takes longer time. New alternative onsite and online method are most urgently need to be studied. Power transformer faults identification based on extended

The paper presents the development of a downscaled hardware-in-the-loop (HiL) setup for a wave energy converter heaving point absorber. HiL simulation involves the buoy motion coupled to a gearbox system that converts the buoy’s vertical movement into rotational. The dynamic movement of the heaving buoy is simulated and converted into rotation. A process is employed to determine the resultant torque

Although direct phase current control of brushless DC motor prevents commutation current ripple at low speed, it occurs at high speed which has not received the deserved attention in the literature. Dealing with this current ripple is of practical significance because commutation becomes more influential for high speeds as its duration and the current ripple’s amplitude increase with speed. This paper

This article introduces a unique dynamic balance strategy (DBS) that can overcome many disadvantages such as voltage and frequency deviations, overloading, high infrastructure costs that may occur in the network integration of electric vehicles (EVs). The proposed method is also aimed at keeping the comfort and satisfaction of the EV users at a high level without the obligation of the EV owners to

In this paper, an advanced electrothermal model was developed in order to provide real-time information about the thermal states of the electrical components of the vehicle’s powertrain and determine the evolution of losses and that of powertrain parameters versus temperature during vehicle traffic. Then, electrothermal models were introduced in order to study the impact of the thermal behavior of

This paper proposes a nonuniform delay-dependent robust secondary voltage control strategy with a finite-time voltage reference observer for an islanded microgrid. A discrete-time consensus algorithm is introduced to track the output voltage. By model transformation, a closed-loop microgrid control system is obtained. And then, the corresponding global stability and robust performance analysis theorems

A new field-oriented control strategy for induction motor is proposed in the paper. It is called Maximum Torque Per Watt (MTPW) and allows obtaining the minimum value of the sum of the stator and rotor losses due to joule effect, and of the iron losses, for a given value of the reference torque and of the motor speed. Iron losses have been modeled according to Steinmetz equation, separating hysteresis

In this paper, an adaptive degrees-of-freedom finite element method is extended to three-dimensional (3-D) nonlinear magnetic field analysis. The error distribution of the discrete solution changes along with the iterative process, and mesh coarsening or other operations with the same effect is needed to keep the scale of the problem small. In this proposed adaptive method, dispensable degrees of freedom

The increasing volume of distributed resources and user-dependent loads in local networks has increased the concern for congestion and voltage management in distribution networks. To mitigate these issues, the implementation of local flexibility markets has been proposed to assist distribution system operators (DSOs) to manage their networks efficiently. This paper presents the framework of a local

Coordinated voltage control CVC is necessary in microgrid with high penetration of distributed renewable energy resources, to keep the voltage in required range and to optimize the grid performance. The SCADA-as-a-service (SCADA-aaS) approach allows the secured deployment of CVC and provides the interoperability framework for the network operators to distribute their CVC algorithm to remote microgrid

In this work, a model is proposed for the computation of unbalanced magnetic pull (UMP) in PM machines. This model is suitable for use in dynamic simulations. However, the aim of this research is not dynamic modeling of the PM machines. The main idea is to provide a fast model to be integrated into the dynamic models of PM machines. To reduce the required computational burden, the UMP of PM machines

The uncertainty of solar generation is a challenging issue for the operation and control of distribution systems. Also, because of the large number of control and operation variables in advanced distribution networks, the centralized optimization technique requires high computational capabilities. In this paper, a distributed voltage regulation approach in a distribution system based on the predictor

Accurate estimation of wind speed distributions is a challenging task in wind power planning and operation. The selection of convenient functions for describing wind speed distribution is a crucial requisite. In this paper, remarkable bi-parameter Weibull function is presented to estimate the wind energy potential. Weibull parameters based on different six estimation methods, namely graphical, method

In order to solve the unbalanced harmonics problem of multi-source and multi-inverter system, a networked hierarchical control approach is proposed, based on the structure of hierarchical control and combined with active parallel filters (APF). In the control approach, the distributed generator (DG) consists of primary and secondary control. In the primary controller and the secondary controller, some

The paper considers various basic feeder schemes of urban distribution networks from the standpoint of economy, reliability, and technical limits. Presented are the mathematical models for the analysis of feeders’ annual costs, reliability performances, voltage drops and cable loading in normal and critical emergency situations. The suggested approach takes into account the uncertainty of various basic

In this paper, the method of digital twin integrated power-hardware-in-the-loop for the assessment of distributed renewable energy resources is presented. The digital twin of the electrical grid is created via synchronization between the real-time simulator and the supervision, control and data acquisition system. The digital twin can be integrated to larger system with the addition of simulated devices

Wind and solar as two renewable energy resources are largely used to generate clean and sustainable energy in the power systems. To integrate these renewable energies in the power system, different aspects of the power system such as reliability and operation are affected that must be investigated. It is due to the variation in the generated power of these resources that are arisen from the variation

This paper describes the research on the electrical ageing mechanism of the resin-rich molding (RRM) insulation by the dielectric response method for large generator. The dielectric properties of the RRM insulation materials with different ageing time were measured and analysed by dielectric temperature spectrum, frequency-domain spectrum (FDS) and thermally stimulated depolarization current (TSDC)

The performance of a multilevel inverter depends upon design and selection of an appropriate modulation technique. Space vector pulse width modulation (SVPWM) technique offers more flexibility than other pulse width modulation (PWM) techniques. However, conventional SVPWM technique becomes more complex for multilevel inverter because of increased number of space vectors and redundant switching states

This paper presents a hybrid travelling wave/distance protection for HVDC transmission lines by constantly monitoring the phase angles of characteristic harmonic impedances, measured from one head of the line. Waveform analysis, using the fast Fourier transform, reveals that the behaviour of the phase angles of characteristic harmonic impedances is periodic, and based on their results, the transmission

Accurate identification of incipient cable fault is helpful to improve the reliability of power system. This paper proposes an incipient fault identification method for distribution networks cables based on feature matching of power disturbance data. Firstly, based on the power disturbance data provided by the power quality monitor about the incipient faults, a characteristic analysis is performed

While steer-by-wire (SBW) systems benefit from improved performance and comfort, they require a large number of sensors impacting whole system reliability. In order to address this challenge fault tolerance property against sensor faults has to be improved. Application of redundancy for the sensors is the best solution proposed so far. This paper proposes a novel solution of analytical redundancy based

This paper proposes an improved coefficient diagram method (CDM) for proportional integral derivative acceleration (PIDA) controller design. In the improved CDM, stability indices are obtained using a graphical approach based on the maximum sensitivity constraints. The stability indices play an important role in the designing of the controller and stability of the closed-loop control system. Further

This article presents an efficient method for power quality events (PQEs) detection and classification based on Curvelet transform (CT) and optimized extreme learning machine (OELM). Initially, various PQEs signal data are extracted even under noisy and simultaneously occurred multi-event conditions to reflect the real-time conditions. Relevant features of all these extracted signals are computed by

This paper proposes a novel capacitive power transfer (CPT) system with switchable compensation for achieving constant current (CC) or constant voltage (CV) output against load and coupling capacitance variations. Meanwhile, a parameter design method is proposed to ensure a low input impedance angle at constant operation modes. Mathematical models of voltage and current gains are established, which

In this paper, a static volt-ampere-reactive compensator (SVC) composed of fixed capacitor-thyristor controlled reactor (FC-TCR) is employed to regulate the terminal voltage of self-excited induction generator (SEIG) in the purpose of controlling the output power. In addition, the speed of the generator is adjusted by robust proportional-integral-derivative (PID) in order to regulate the frequency

Sensorless strategies become very popular in modern control techniques because they increase the system reliability. Besides, they can be used as back-up control in case of sensor failure. In this paper, a DC-link sensorless control approach is developed, which is suited for grid-connected PV systems. The studied system is a two-stage PV scheme, where the DC–DC stage (boost converter) is controlled

In this paper, an improved hybrid current modulation (iHCM) method for bidirectional power flow operation of dual active bridge (DAB) ac/dc converter is proposed. In this method, trapezoidal (TZM) and triangular (TRM) current modulations are performed together in a grid period to obtain distortionless grid current with forming minimum RMS current in the transformer of DAB. This study put forward a

This paper proposes a two-phase radial flux brushless DC motor comprising a rotor decorated with hybrid permanent magnet (PM) material, i.e., rare-earth NdFeB magnets combined with ferrite magnets. The rare-earth NdFeB magnets are used on the surface, and ferrite magnets in the spoke-type configuration. The combined surface and spoke-type topology are used to improve the output torque as well as to

In this paper, the reluctance torque is utilized for improving the starting and average torques of a conventional brushless wound field synchronous machine (BL-WFSM). The conventional BL-WFSMs have an inherent issue of zero-starting torque. The existing BL topologies use expensive rare-earth permanent magnets (RE-PMs) to improve the starting torque; however, the marker price of RE-PMs fluctuates. Therefore

The method for modeling switching converters plays a key role in real-time simulators. Associate discrete circuit (ADC) modeling technique is a commonly used method for modeling the switching converter. However, the optimal selection of the ADC-based switch model parameters has great importance in the accuracy of the real-time simulator. In this paper, the design of a real-time simulator for a switching

Increasing prominence of series compensation into the power system has evidently enhanced the rise of subsynchronous resonance (SSR). Alleviation of SSR with two novel control designs for static synchronous compensator (STATCOM) is proposed in this paper. Since it is quite challenging to optimize proportional and integral (PI) controllers in a nonlinear framework, hence a nonlinear active disturbance

The multidimensional purposes of grid-tied hybrid renewable system such as tracking of maximum power, increasing the power conversion efficiency, reducing the harmonic distortions in the injected current and control over power injected into the grid are presented in this paper by developing a laboratory-scale setup. To ensure continuous current operation at the shoot through mode of grid connected

This paper proposes the traction motor analysis and weight reduction for an electric golf car with 1 + 5 passengers, because the power to weight ratio is the critical parameter for the electric vehicle in terms of the vehicle performance. Firstly, the induction motor (IM) already used in the electric golf car is tear-downed and modelled in a simulation environment, and the model is verified by the

Fault localization is a key task on power systems operation and maintenance. When it comes to distribution networks, the problem is especially challenging due to the non-homogeneous characteristics and unique topology of each feeder. This paper presents a method based on gated graph neural network for automatic fault localization on distribution networks. The method aggregates problem data in a graph

Dynamic changes in the network can occur due to short-circuit conditions, the maloperation of the relays, development, operation, and repairs on any part of the power system. Also, most of the new protective schemes are based on a communication channel, which cannot be guaranteed in practice. In other words, the communication channels are operating with high load and therefore become more vulnerable

Successful fault management strategies are essential for implementing practical self-healing procedures in the automated distribution systems. Such tools effectively decrease repairing times by precise detecting and locating the deteriorated components in distribution networks. In this paper, the reliability analysis is computed using dynamic distribution network measurements for a modified autonomous

The objective is to compare the electrical performance of a tubular barrier made of silicone and glass protecting an air gap with an alternating electric field. This investigation is focused on rod–rod and rod–plane electrode systems with variable interelectrode distance. An experimental device consists of wooden support in U shape. The air space disruption tests of the two systems with tubular barriers

The power factor of industrial facilities is typically inductive. The case study in this paper was based on a typical Malaysian 11-kV on-grid industrial system with renewable energy sources and electric vehicle charging station connected. The integration of renewable energy sources reduces energy consumption from the grid; it consecutively reduces greenhouse gas emissions. However, the integration

To support the safe operation of the novel three-element mixed insulation oil (TEMO) transformer, gas generation behaviors of the TEMO oil–paper insulation system under overheating faults and discharge faults were investigated. Results show that that the content of H2 and C2H6 generated by TEMO–paper insulation system is much higher than that in conventional mineral oil (MO)–paper insulation system

The high penetration of wind generation has prompted the development of stochastic hydrothermal unit commitment (SHTUC) models, which are more difficult to be solved than their thermal-based counterparts due to hydro generation constraints and inflow uncertainties. For handling the uncertainty, the problem is usually formulated as a two-stage stochastic model (2S-SHTUC), although multistage (MS-SHTUC)

The paper considers electrical drives control having a hierarchical cascaded structure. This structure has an inner current control loop and outer loops for speed and position control. The design of the control is performed using a discrete-time model of electrical drive. In all the loops, the discrete-time quasi sliding mode control is used for controller design because of its robustness to external

The paper considers two power quality issues: voltage distortion and voltage drop along the pole lines of different LED street (road) lighting installations. The research includes three parts: (1) development of a novel model and the corresponding software for calculating voltage harmonics in the three-phase LED street lighting installations, where the load is nonsymmetrical and nonlinear. The model

A rotor retaining sleeve is mechanically necessary in the structure of high-speed SPM machines to prevent structural failure. However, the significant eddy current loss within metal sleeves leads to a reduction in electromagnetic efficiency and serious thermal and mechanical issues. Therefore, several techniques and methods have been proposed and developed to reduce such losses. In this paper, a helical

This paper investigates certain fault analysis such as fault detection, identification and classification and their fault ride through (FRT) technique in a smart grid (SG) system using Stockwell transform (ST) and solid-state fault current limiter (SSFCL). ST when applied to symmetrical and asymmetrical faults for the detection and identification in a SG System yields a ST amplitude matrix (STA). The

In this paper, unipolar excitation-based speed sensorless vector-controlled switched reluctance motor (SRM) drive is addressed. The use of position/speed sensors has few apprehensions in terms of price, dependability, compactness, especially from electric vehicle (EV) application view point. Therefore, for speed/torque control of SRM, it is mandatory to have some estimation technique which estimates

This paper proposes an enhanced genetic algorithm model, named EGA-TEP, to solve the transmission expansion planning (TEP) problem of electric power system networks. Heuristic information is integrated into the evolutionary process of metaheuristic to improve the expansion plans (solutions). This heuristic information is translated in the form of sensitivity indices, based on the circuit loading/overloading

A new multifunctional inverter control structure is proposed in this paper by embedding the harmonic and unbalance regulators into the virtual synchronous machine (VSM). While including the harmonic and unbalance regulators, inverters can provide support to the grid not only as VSMs, but also as active power filters (APFs) and unbalance conditioners. Different from the traditional multifunctional inverter