Abolfazl Halvaei

• Ph.D
• Professor at University of Kashan

The reliability‐oriented optimized sizing and placement of electric vehicle (EV) charging stations (EVCSs) has received less attention. In addition, the literature review shows that a research gap exists regarding a clustering‐based method to optimize the allocation of DGs and EVCSs, considering the system uncertainties. This article tries to fill...

In this paper, as the main contribution, three sensorless control structures are presented for the control of the grid-connected PMSG-based wind turbine (WT) employing boost converter and diode rectifier as the machine-side converter. Then, detailed control structures of the boost converter and grid-side converter at the three mentioned control str...

In this paper, a new model predictive control (MPC) is proposed for brushless DC motor (BLDCM) to reduce the commutation torque ripple (CTR). The torque ripples generate vibration noise and reduce the efficiency. With purpose of minimizing the CTR of the BLDCM and considering the CTR sources, the proposed MPC scheme is designed by predicting the ph...

The smart grid reliability is dramatically affected due to system uncertainties. Although much efforts have been devoted to developing the Monte Carlo simulation (MCS)-based or analytical methods for reliability-based optimal allocation distributed generation (DGs) and protective devices (PDs), there is a research gap about developing the probabili...

Brushless DC motors have been widely used in both industrial and non-industrial applications. Commercialization of these drives by reducing their price and increasing reliability, are among the main goals of manufacturers and researchers. These goals have been partially achieved by reducing the number of switches, current or voltage sensors, and el...

Dynamic capacitor (DCAP), as a shunt power quality device, corrects the power factor of the load and reduces the total harmonic distortion (THD) of the source current. A novel control method was presented based on the model predictive control (MPC) to control a three-phase three-wire buck-type DCAP. The injected current of DCAP is the control varia...

This study suggests an adaptive and optimal control method to achieve the maximum power point tracking (MPPT) in the photovoltaic (PV) systems. For the maximum power transmission under varying the environmental conditions and partially shaded conditions, MPPT technologies are utilized in PV systems. For the improvement of functioning MPPT, a new fo...

This study presents the transient stability and low voltage ride through (LVRT) improvement of IEEE 68‐bus system connected with wind farms and photovoltaic (PV) plant through coordination of static synchronous series compensator (SSSC) and power system stabilisers (PSSs) controllers. It is generally accepted that there is a threat to the stability...

In this paper, the space vector modulation (SVM) strategy is employed for switching in CSI-BLDC motor drive in order to reduce the switching losses, minimize current and torque ripple and increase the reliability of the drive. The BLDC motor drive model is implemented in the Proteus simulator software and the motor behavior is simulated at differen...

Evaporative coolers with single-phase induction motors (SPIMs) are one of the least efficient and most commonly used electrical power consumers all over the world. Recently, it has been suggested to substitute SPIMs with higher efficiency motors, such as permanent magnet brushless (PMBL) motors. However, control method for brushless motors often wo...

In this paper, the effects of three FACTS controllers, static synchronous series compensator (SSSC), thyristor-controlled series compensator (TCSC), and static synchronous compensator (STATCOM), on the transient stability of a multi-machine power system in the presence of two 200 MW wind farms based on a doubly fed induction generator (DFIG) and a...

Due to some inevitable restrictions during fabrication of permanent magnet brushless (PMBL) motors, some of them have neither sinusoidal nor trapezoidal back-EMF voltages, that we name them as non-ideal PMBL motors. Employing conventional control strategies of permanent magnet synchronous motors (PMSMs) and brushless DC motors (BLDCMs) leads to low...

Today, the pulsed power systems have been employed in many applications. To meet the requirement of user, the pulse generator should enjoy the advantages of compactness, high flexibility, high pulse repetition rate and cost efficiency. Among all of converters that can be used to generate high voltage pulses, capacitance diode voltage multiplier (CD...

The hysteresis motor is a well-known synchronous motor that is used in special small power, high speed applications. Dynamic modeling and analysis of this motor is more complicated than permanent magnet synchronous motors (PMSMs) or induction motors (IMs) due to nonlinear behavior of rotor magnetic material. Short over-excitation is a unique phenom...

This paper investigates the design and implementation of direct power control (DPC) strategy for brushless DC (BLDC) generators. Since in conventional BLDC generator systems, electrical power is transferred to the DC-link through uncontrolled diode rectifiers, a great deal of energy may be lost. Moreover, in some applications where the shaft speed...

Hysteresis motors are used in special applications such as gyroscope and gas centrifuge due to their unique features such as synchronism, self-starting, and developing smooth torque. Dynamic modeling of hysteresis motors is essential to the prediction of the transient performance, the study of the dynamic stability, the development of modern closed...

This paper explores the design, analysis and simulation of a high speed disk-type (axial flux) permanent magnet (AFPM) synchronous motor. This motor has rated power 0.5 hp at speed of 60,000 rpm used in some special industrial applications. The design of high speed AFPM motor is performed using analytical relations, and sizing of various components...

Due to some inevitable restrictions during fabrication of permanent magnet brushless (PMBL) motors, some of them have neither sinusoidal nor trapezoidal back-EMF voltages, and these types of motor are named non-ideal PMBL motors. Employing conventional control strategies of permanent magnet synchronous motors (PMSMs) and brushless DC motors (BLDCMs...

Recently, the pulsed power systems have found wide applications. For this reason, using the pulsed power generators that in addition to responding to the needs of the user, are providing the advantages of compactness, high flexibility, high repetition rate and cost efficiency is inevitable. This paper proposes a converter which is a combination of...

The hysteresis motor is a well-known synchronous motor that is used in special small power, high speed applications. Dynamic modeling and analysis of this motor is more complicated than permanent magnet synchronous motors (PMSMs) or induction motors (IMs) due to nonlinear behavior of rotor magnetic material. Short over-excitation is a unique phenom...

Nowadays, due to excellent advantages of permanent magnet brushless (PMBL) motors such as high efficiency and high torque/power density, they are used in many industrial and variable-speed electrical drives applications. If the fabricated PMBL motor has neither ideal sinusoidal nor ideal trapezoidal back-EMF voltages, it is named nonideal (or nonsi...

Energy and power distribution between multiple energy sources of electric vehicles (EVs) is the main challenge to achieve optimum performance from EV. Fuzzy inference systems are powerful tools due to nonlinearity and uncertainties of EV system. Design of fuzzy controllers for energy management of EV relies too much on the expert experience and it...

To analyze hysteresis motor performance from startup to synchronism, we need to a valid dynamic model. This paper studies and evaluates various dynamic modeling methods for hysteresis motor. Modeling based on constant impedance for the rotor, variable impedance based on load angle for the rotor, and variable impedance as well as dependent voltage s...

This paper presents a simple and low-cost method to capture maximum power throughput of permanent magnet brushless DC (BLDC) generator. Conventional methods of rectification are based on passive converters, and because the current waveform cannot be controlled as ideal waveform, a highly distorted current is drawn from brushless generator. It leads...

The studies for hybrid electrical vehicle (HEV) have attracted considerable attention because of the necessity of developing alternative methods to generate energy for vehicles due to limited fuel based energy, global warming and exhaust emission limits in the last century. HEV incorporates internal composition engine, electric machines and power e...

Traditional BLDC motor drives use voltage source inverters (VSI) that utilize PWM and hysteresis hard switching methods. It leads to generate switching losses and need to use of large heat sinks. VSIs are costly because of low reliability and need to large DC link capacitor. Moreover, common control methods such as hysteresis current control can cr...

This paper proposes the design of sensorless induction motor drive based on direct power control (DPC) technique. It is shown that DPC technique enjoys all advantages of pervious methods such as fast dynamic and ease of implementation, without having their problems. To reduce the cost of drive and enhance the reliability, an effective sensorless st...

New technologies to solve environmental problems are in demand nowadays. Existing methods cannot always be used because they are too expensive, have unwanted byproducts or simply don't work. A new approach is to create active species in situ so transport losses can be avoided. Pulsed corona discharges is such a method. Its principle is that high en...

This paper proposes the speed control of brushless DC (BLDC) motor via direct power control (DPC) method as a novel and effective strategy in electrical drives applications. The DPC has some advantages rather than other control methods of BLDC motor including simpler control algorithm and faster dynamic response. In proposed BLDC motor drive based...

This paper investigates the design and implementation of single-phase, three-level inverter controlled by sub-harmonic pulse-width modulation (SH-PWM). The performance of developed 3-level inverter is simulated and then is compared with 2-level conventional inverter as well as FFT analysis. Experimental test has been undertaken to examine the opera...

Torque ripple and resulted acoustic noise and vibration are the main disadvantages of brushless DC (BLDC) motor drives. In this study, One-Cycle Control (OCC) is developed for current regulation of brushless DC (BLDC) motor drive as a unified constant-frequency integration control strategy. Employing one-cycle control strategy reduces high frequenc...

Controlled induction motor drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. For these speed sensorless AC drive system, it is key to realize speed estimation accurately. This paper describes a Model Reference Adaptive System (MRAS) based scheme using Artificial Neural Network (ANN) fo...

This paper proposes the design of a robust nonlinear optimal controller to move the underwater vehicle in the depth channel using gradient descent method. A nonlinear model with six degrees of freedom (6-DOF) has been extracted for the underwater vehicle. To selection of the model and design of controller, conventional assumptions used for other co...

One-Cycle Control (OCC) is developed in this study for current regulation of Brushless DC (BLDC) motor drive as a unified constant-frequency integration control strategy. Employing one-cycle control strategy reduces high frequency torque ripple of conventional hysteresis current controllers leading to lower acoustic noise and vibration in the drive...

New energy management strategies for hybrid electric vehicles (HEV) play an important role on HEV's future. In order to achieve high performances, less fuel consumption and pollution, and higher efficiency, modern strategies should be employed. Fuzzy approach is one of the most popular and powerful techniques in energy management and optimization w...

Due to significant increase in the demand of electric motors, design and manufacturing of high efficiency motors and related variable speed drives has been a major interest by many suppliers. Brushless DC (BLDC) motor has many advantages including high torque capability. In this paper, the possibilities of direct power control (DPC) of BLDC motors...

One-Cycle Control (OCC), as a unified constant-frequency integration control strategy for current control of brushless dc (BLDC) motor drive is presented in this paper. Employing the one-cycle control strategy reduces high frequency torque ripple of conventional hysteresis current controllers that leads to lower acoustic noise and vibration of the...

Brushless DC drives are widely used in hybrid electric vehicles and automotive applications as motor or generator due to their high efficiency, high power density, ease of control, and lower maintenance. In this paper, the control of brushless DC generator has been studied using direct power control (DPC) algorithm. Since in the conventional drive...

In this paper, one-cycle control (OCC), as a constant-frequency PWM control strategy for current control of a six-switch brushless dc (BLDC) motor drive is investigated. Developed current regulator is a unified controller and PWM modulator. Employing the one-cycle control strategy, decreases the torque ripple resulted from the conventional hysteres...

Hybrid electric vehicles (HEV) in addition to provide the benefits of electric vehicles could satisfy consumers for some performances of conventional internal combustion engine (ICE) vehicles such as acceleration and long range. On this way, suitable energy optimization strategies should be employed to get desired efficiency, less fuel consumption...

Recently, due to significant increase in demands of electric motors, design and manufacturing of high efficiency motors and related variable speed drives have been regarded by many suppliers. Among several kinds of motors, the brushless DC (BLDC) motor has many advantages including high torque capability. In this paper, for the first time, the poss...

Power system stability is one of the main factors in performance of electrical system. A control system must retain frequency and voltage size under any distortion such as sudden increase in load, to leave a generator from circuit or cut off a transmission line in a constant level. In this paper, Honey-bee mating optimization (HBMO) algorithm has b...

The aim of this study is investigation of the feasibility and advantages of using the natural gas as an alternative to gasoline as a fuel for hybrid electric vehicles. Operating CNG vehicles are really beneficial in the Middle East region considering the fact that gasoline is offered at a heavily subsidized price and therefore, by converting a sign...

Induction motors offer many advantages tools, and therefore are becoming very popular industrially and commercially. This paper presents the implementation of Xmega microcontroller based PWM inverter controlled of four-switch three phase voltage source inverter (FSTPI) fed induction motor drive. The reduction of the number of power switches from si...

Hysteresis motors are super high speed motors that used in special industries such as high-speed centrifuges, micro gas turbines, and etc. They are basically synchronous motors; however they can works in asynchronous mode. In most reported applications it is controlled in open-loop scheme and there isn't any considerable research on closed-loop con...

Hybrid electric vehicles (HEV) in addition to providing benefits of electric vehicles, could satisfy consumers for some performances of conventional internal combustion engine (ICE) vehicles such as acceleration, long range, and braking. On this way, suitable energy optimization strategies should be employed to get desired efficiency, less fuel con...

There is an interest in super-high-speed motors in industry applications such as gyroscope, micro gas turbines, centrifuge, machine tool spindle drives, and information storage disk drives. This paper presents the dynamic performance characteristics of hysteresis motors using a Matlab/Simulink software. A nonlinear mathematical model based on a d-q...

Global warming is a major concern in today's world. To address this issue, most countries are working on the usage of renewable energy sources like solar energy, clean fuels (hydrogen) and trying to increase the efficiency of fossil fuel plants. This paper discusses the hybridization of the renewable solar energy source with highly efficient and cl...

Hysteresis motors are super high speed motors that used in special industries such as high-speed centrifuges, micro gas turbines, and etc. They are basically synchronous motors; however they can works in asynchronous mode. In most reported applications it is controlled in open-loop scheme and there isn’t any considerable research on closed-loop con...

There is no available sensorless technique for hysteresis motors. This paper presents a comparative study of two different speed observer techniques for hysteresis motor drive. Luenberger observer (LO) and model reference adaptive system (MRAS) techniques are considered. The speed estimation algorithm based on both techniques are derived and implem...

Today, cost reduction is important matter in all of the systems. In brushless dc (BLDC) motor drives, cost reduction can be achieved by elimination of three Hall Effect position sensors and reducing the number of power switches. On the other hand, in order to reduce the torque ripple, direct torque control (DTC) method can directly control the inve...

In this paper, sensorless vector control of single phase line-start permanent magnet (LSPM) motors is proposed. Providing two phase voltages for the motor, both start-up and run-up capacitors are eliminated. The provided voltage is such that, electrical angle between main and auxiliary windings voltages is 90 degrees and their amplitude ratio is re...

Hysteresis motors are mainly used for some applications that need very smooth torque from starting to synchronous speed such as gyroscope and gas centrifuge. This paper presents a sensitivity analysis of 60 W, 400 V, 6000 rpm super-high speed hysteresis motor characteristics including electromagnetic torque, power factor, efficiency and stator curr...

Brushless DC (BLDC) motor is attracting much interest due to its high efficiency, good performance and ease of control for many applications. Moreover, reducing of the drive components is more attractive for low cost applications. This paper presents the design and implementation of a reduced-parts BLDC motor drive using the TMS320LF2407A digital s...

This paper proposes a macro-model to simulate of four-switch, three-phase inverter (FSTPI) brushless DC (BLDC) motor drive using switching functions. The proposed model uses inverter switching functions instead of actual circuits, and capable to show the whole steady state and transient performance of the drive. An entire BLDC motor drive including...

Hysteresis motors behave very much like to classical synchronous motors, except that the motor magnetic pole definition varies slightly with torque. This paper presents a study on the hunting of a radial-flux type, high speed hysteresis motor caused by the hysteresis material of the rotor. Firstly, a nonlinear dynamic model of the PWM-controlled hy...

We propose a position sensorless control scheme for a four-switch, three-phase brushless DC motor drive, based on the zero crossing point detection of phase back-EMF voltages using newly defined error functions (EFs). The commutation instants are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than ph...

Brushless DC (BLDC) motor is attracting much interest due to its high efficiency, good performance and ease of control for many applications. Moreover, reducing of the drive components is more attractive for low cost applications. This paper presents the design and implementation of a reduced-parts BLDC motor drive using the TMS320LF2407A digital s...

This paper presents the analysis, design, and implementation of a cost-effective sensorless control technique for a low-cost four-switch, three-phase inverter brushless dc motor drive. The proposed sensorless technique is based on the detection of zero crossing points (ZCPs) of three voltage functions that are derived from the filtered terminal vol...

Brushless DC (BLDC) motor is attracting much interest due to its good performance for many applications. Moreover, cost reducing of the drive is more attractive for low cost applications. This paper presents the design and implementation of a reduced parts BLDC motor drive. Part reducing is achieved by elimination of three Hall Effect position sens...

Brushless DC (BLDC) motor is attracting much interest due to good performance and ease of control for many applications. Moreover, reducing of the drive components is more attractive for low cost applications. This paper presents the design and implementation of a reduced parts BLDC motor drive using the TMS320LF2407A digital signal processor (DSP)...

Brushless DC (BLDC) motor is getting more attention due to its high efficiency, good performance and ease of control for many applications. This paper presents the design and implementation of a torque controller for a BLDC motor drive using the TMS320LF2407A digital signal processor (DSP) produced by Texas Instruments. At first, a theoretical anal...

This paper introduces a novel and low cost brushless DC (BLDC) motor drive. Proposed drive is a four-switch inverter for a three-phase BLDC motor, without any mechanical hall sensors. The proposed concept is based on the fact that in a four-switch topology, the zero crossing points of the stator terminal voltages Vao and Vbo-Vao and -Vbo coincide t...

Obviously, transformer winding type has a great effect on flux leakage which it's turn affect voltage drop, magnetic losses and transformer efficiency. In this paper, winding type effect on flux leakage is investigated using 2D finite element method. For this purpose two main winding type namely, helical and sandwiches windings, are considered and...

This paper presents an original study on the generated torque ripples of phase commutation in the Four-Switch, Three-Phase Inverter (FSTPI) Brushless DC (BLDC) motor drive which is suitable for low cost applications. Analytic values of torque ripple and commutation duration are obtained for different operation conditions. Moreover, limitation on th...

Brushless DC (BLDC) motor is attracting much interest due to its high efficiency, good performance and ease of control for many applications. This paper presents the design and implementation of a torque controller for a Brushless DC motor drive using the TMS320LF2407A digital signal processor (DSP) produced by Texas Instruments. Firstly, a theoret...

This paper compares the performance and parameter characteristics of Fuel Cell Vehicles (FCV) and Hybrid Electric Vehicles (HEV) with a view towards an objective assessment of the relative performance of these vehicles. Firstly, the main characteristics of hybrid electric vehicles (HEVs) as low emission vehicles (LEVs), including presumed high effi...

This paper compares the performance and parameter characteristics of Fuel Cell Vehicles (FCV) and Hybrid Electric Vehicles (HEV) with a view towards an objective assessment of the relative performance of these vehicles. In particular, this paper reviews major characteristics of fuel cell powered vehicles (FCVs) as zero or ultra-low emission vehicle...

Torque ripple generated in the commutation interval is one of the main drawbacks of BLDC motor. This paper presents an original study on the generated torque ripples due to phase commutation in the four-switch, three-phase inverter (FSTPI) brushless dc motor drive which are suitable for low cost applications. Torque ripple and commutation duration...

Principle of a new adaptive neuro-fuzzy inference system (ANFIS) with supervisory learning algorithm is introduced and is used to regulate the speed of a four-switch, three-phase inverter (FSTPI) brushless DC (BLDC) drive. The proposed algorithm has advantages of neural and fuzzy networks. To enhance of drive's performance, instead of well-known ba...

Torque ripple generated in the commutation interval is one of the main drawbacks of BLDC motor. This paper presents an original comprehensive study on the generated torque ripples due to phase commutation in the four-switch, three-phase inverter (FSTPI) brushless DC motor drives which are suitable for low cost applications. Torque ripple and commut...

Principle of a new adaptive neuro-fuzzy inference system (ANFIS) with supervisory learning algorithm is introduced and is used to regulate the speed of a four-switch, three-phase inverter (FSTPI) brushless DC (BLDC) drive. The proposed algorithm has advantages of neural and fuzzy networks. To enhance of drive's performance, instead of well-known ba...

Obviously, transformer winding type has a great effect on flux leakage which it's turn affect voltage drop, magnetic losses and transformer efficiency. In this paper, winding type effect on flux leakage is investigated using 2D finite element method. For this purpose two main winding type namely, helical and sandwiches windings, are considered and...