Abstract

In this paper, the performance of a three-phase shunt active power filter (APF) using the instantaneous power theory (p-q theory) has been compared with that corresponding to the use of the synchronous reference frame (SRF) based method. It is clear that, under balanced and sinusoidal voltage conditions, these two methods gives similar results. The entire system has been modeled using MATLAB-SIMULINK software. The simulation results demonstrate the applicability of both methods for the APF control.

Abstract

The present paper proposes and studies the effi-ciency of using a RSM enhanced ACOR algorithm for the optimization of electromagnetic devices. Different RSM methods, such as Box-Behnken, CCD and Doelhert, are applied to find most suitable parameters (optimal set) for the ACOR in order to solve the corresponding electromag-netic optimization problems. The parameters optimal set is found by building a metaheuristic function. In the same time, the optimal parameter set is searched and determined for each electromagnetic problems for different objective functions, the best and the average global best solution for a tests set. The electromagnetic devices to be optimized are the Loney’s solenoid and an energy storage device, as defined by the TEAM22 problem. Both electromagnetic problems are proposed benchmarks from electromagnetic community.

Abstract

The choice of the power components of the electric traction converters for autonomous vehicles is a very important aspect in their design. The attention in this paper is first focused on the choice of the DC link capacitor, followed by choice of the IGBT modules, their testing and cooling. Then, the choice of power cables is approached. A dedicated test bench for electric traction converters for autonomous vehicles was designed and achieved. In defining the parameters of the test bench, various possible applications on battery-powered vehicles were taken into account, but also their performances, technical characteristics and functional characteristics. An important share belongs to the integrated propulsion/charging system of the Li-Ion battery developed by the company SC INDA SRL. It is already used in automotive on full-electric trucks and in the battery-powered electric locomotives.

Abstract

This paper presents an application for real-time implementation of the Permanent Magnet Synchronous Motor (PMSM) sensorless control system and its integration into Supervisory Control And Data Acquisition (SCADA). Starting from the operating equations of the PMSM and by implementing the global Field Oriented Control (FOC) con-trol strategy, in which the saturation of the integral compo-nent of the PI controller is prevented by using an anti-windup technique, the numerical simulations performed in Matlab/Simulink lead to good performance, which recom-mends the real-time implementation. For the optimal tuning of the PI speed controller of the PMSM the genetic algo-rithm (GA) is used. Numerical simulations are performed in order to choose the type of Digital Signal Processing (DSP) used for the real-time implementation, considering that a global criterion of successful implementation is the perfor-mance/cost ratio. Besides, the integration into SCADA pro-vides flexibility of the control system but also the possibility of online/offline processing from the point of view of other specific requirements. Among them we mention the energy quality analysis, whose first exponent calculated also in real-time is Total Harmonic Distortion (THD). Real-time imple-mentations are performed in Matlab/Simulink and Lab-VIEW programming environments. According to the trend of the last years, the use of an Internet of Things (IoT) plat-form for viewing the variables of the control process on the Internet plays an important role.

Abstract

In the process of validation of crimped connec-tions, the determination of the connector resistance factor and of the initial scatter coefficient has a decisive role. In this paper is studied the impact of the experimental meas-urements accuracy on the calculation of initial scatter, cu-mulating data from various types of crimped connections. This coefficient provides information on the behavior of the crimped connection immediately after installation before any aging effect begins. The standards establish that 6 sam-ples are sufficient to be tested to estimate the identification of a “family” of connectors. The measurements were per-formed on crimped connections of barrel of terminal lug type for three cross sections of cables and on crimped con-nections of bimetallic through connector type for two pairs of cross sections. The initial scatter is influenced by 6 repre-sentative measured quantities as voltage drops, currents and conductor lengths. First, it was imposed a variation by one unit of hundredths digit of initial scatter and was recorded the variation of each quantity, the others 5 quantities being kept constant. Then simultaneous variations of the 6 quanti-ties caused by device reading errors were imposed, deter-mining the quantities with the greatest influence on initial scatter. Useful recommendations for experimenter are made.

Abstract

In this paper, the rotor field-oriented control is applied for a three-phase induction motor used in electric traction of an autonomous locomotive powered by a battery. First, the operating equations in the rotor field-oriented system are introduced. Then, the control scheme based on the structural scheme and operational equations are pre-sented. After referring to the design of the controllers, the performances of the control system during the start-up pro-cess by prescribing a ramp speed and step rotor flux are addressed and analyzed. Four values of the prescribed speed are taken into consideration. Through the presented results, the synthesis of the control system and control algorithm are validated.

Abstract

Wireless (contactless) transfer of electric power is a disruptive technology because it abandons wired transmission technology, the only technology used in electrical and electronic engineering until recently, just like in the past animal traction and film photography were replaced by mechanical traction and digital photography. Although revealed at the end of the nineteenth century through Tesla’s inventions, it could be applied in practice only in the ‘80s of the twentieth century, with the development of power electronics and microprocessors. After an introduction and an overview of the operating principles, the paper presents the readiness level reached by this technology, the stage of standardization, Romanian achievements and future prospects for high power applications.

ANNALS OF THE UNIVERSITY OF CRAIOVA – Electrical Engieneering Series, no. 45, vol. 45, Issue 1, 2021 (click to download)

Wireless Transfer of Electric Power – a Disruptive Technology – Andrei Marinescu

Application of the Rotor Field-Oriented Control for an Induction Motor Used in Electric Traction – Mihaela Popescu, Alexandru Bitoleanu, Constantin Vlad Suru

Impact of Experimental Measurements Accuracy on Validation Process of Crimped Connections – Alin-Iulian Dolan, Constantin-Florin Ocoleanu

Real-Time Sensorless Control of the PMSM based on Genetic Algorithm, Sliding Mode Observer, and SCADA Integration – Claudiu-Ionel Nicola, Marcel Nicola, Maria-Cristina Niţu, Dumitru Sacerdoţianu, Ancuța-Mihaela Aciu

The Choice of the Main Power Components in Electric Traction Converters – Lavinius Sorin Goreci, Mihaela Popescu, Ion Tilă

Optimization of Electromagnetic Devices using a RSM Enhanced ACOR Algorithm – Anton Duca, Bianca Lamba

Comparative Analysis of Two Methods of Calculating the Prescribed Current in a Shunt Active Filtering System – Mihăiță Daniel Constantinescu, Mihaela Popescu, Constantin Vlad Suru

Automatic Ventilation and Air Conditioning System for Educational Training – Ionel Laurenţiu Alboteanu, Andrei Cosmin Militaru

Considerations on the Disturbances Occurred in the Operation of Medium Voltage Electrical Networks with Neutral Treated by Suppression Coil – Silvia-Maria Digă, Nicolae Digă, Paul-Mihai Mircea, Ion Marin

Experimental Study of HBC Fuses with Aluminium Fuse Element at Minimum Rated Breaking Current, Maximum Rated Breaking Current and Transfer Current of Fuse-Switch Combination – Cristian-Eugeniu Sălceanu, Marcel Nicola, Daniel Ocoleanu, Daniela Iovan, Sorin Enache

Simulation of Multi-Motor Propulsion System for Energy Efficiency in Electric Vehicles – Cristian-Liviu Popescu, Laureţiu Marius Dumitran, Alexandru Stănescu

Ways to Determine the Structural Resource of Highly Maneuverable Aircraft – Nicolae-Alin Niculescu, Jenica-Ileana Corcău, Nicuşor Cătălin Stancu

Two Numerical Studies for Longitudinal Movement of a Canard UAV with Vectored Thrust – Liviu Dincă, Jenica-Ileana Corcău, Dionis Cumpan

The Use of Helmholtz Coils Designed for 50 Hz at Higher Frequencies – Georgiana Roşu, Ionel Dumbravă, Ion Pătru, Aurelia Scornea, Octavian Baltag, Andrei Marinescu

Wireless Remote Control for the Anti-Hail Missiles Launch Ramp Positioning System – Sorin Stepan, Gheorghe Manolea

Influence of Synchronized Measurement Errors on the Results of Identification of the Transmission Line Parameters – Murdid Ecaterina, Boris Jingan, Dobrea Ina, Vasilos Elena

Metamaterials – Current and Future Trends – Elena Helerea, Lia- Elena Aciu

Virtual Instrumentation for Study of Shape Memory Alloys Strip while Bending – Gheorghe-Eugen Subţirelu, Sonia Degeratu

Aspects Regarding the Impact of Electrical Vehicles’ Charging on Power Quality – Denisa Ruşinaru, Gabriel Cosmin Buzatu, Leonardo Geo Mănescu, Claudiu Popirlan

‘Open Ended’ Laboratory to Study the Influence of Unit’s Weight on Axle Torque in Railway Traction – Petropol Şerb Gabriela Dana, Petropol Şerb Ion

Constructive Dimensions Optimization for Asynchronous Motors used in Coal Mills – Raluca-Cristina Presură (Nicolae), Sorin Enache, Ion Vlad, Marian-Ștefan Nicolae

Program for Monitoring Operation Regimes of Low-Power Electrical Machines – Sorin Enache, Ion Vlad, Monica-Adela Enache

Contributions Regarding the Monitoring in the Command Center of the Anti-Hail Launch Pads – Sorin Stepan, Gheorghe Manolea

Modeling of Thermal Comfort Parameters in Residential Buildings – Radu-Cristian Dinu, Daniela Popescu, Ioana-Gabriela Sîrbu, Dan-Gabriel Stănescu

Studies on the Command of Single-Phase Rectifiers Using the Scalar Control Technique – Florin Alexandru Teodorescu

ANNALS OF THE UNIVERSITY OF CRAIOVA – Electrical Engieneering Series, no. 44, vol. 44, Issue 1, 2020 (click to download)

Abstract

One of the important problems of power supply systems consists in ensuring the quality of energy supplied to consumers. In this issue, the reduction of the harmonic spectrum of the supplied voltage and current has a key role. As electronic power converters are now increasingly used by consumers, the problem of reducing the harmonic spectrum of the current absorbed by the power supply by these consumers is becoming more and more pronounced. For this, there is the problem of using consumers with a power factor as close as possible to the unit, which also ensures the increase of the efficiency of these consumers. The present paper focuses on the study of single-phase rectifier configurations provided with power factor control (PFC) structures. Among the multiple techniques and methods of power factor control, the scalar power factor control technique was applied to a boost type power converter, in two variants. The first variant is that of a single-phase rectifier in fully controlled bridge. The second is that of a single-phase rectifier in uncontrolled bridge. In both cases, the study of the scalar PFC technique was based on the Matlab/Simulink modeling of the two mentioned configurations. Achieving these models allowed the study of the correction mechanism of the power factor under the influence of the various functional parameters of the approached configurations.