For electric vehicles (EVs) on the move, the only viable solution of electromagnetic energy charging consists of static and dynamic charging, where Inductive Power Transfer (IPT) offers possibilities that no other technology can match. The main objective of this paper is the analysis of the energy charging technologies for vehicles, using magnetically coupled coils. The main idea of such a system consists of an electrified driveway which offers the vehicles the possibility of moving and charging at the same time. The article presents the wireless power transfer principles followed by a presentation of inductive wireless power systems and an example of a parallel-series topology.

For critical infrastructures, technological developments regarding real-time data transmission and processing improve the system’s operability and reliability. However, vulnerabilities are introduced in the case of implementing new remote access methods or where redundancy is low. At the national level, most critical infrastructures are connected, and, therefore, achieving a level of security and resilience is based on identifying a multitude of risks. In this respect, the reduction of risk to acceptable levels directly affects the quality of citizens’ lives and decreases losses in the industry. This study starts from the threats to power systems, namely cyberattacks, which are much more dangerous, although less visible, to operators, and almost invisible to the public or the media. From this point of view, it was proved that the most vulnerable parts of the power system were human–machine interfaces, electrical equipment, Surveillance, Control, and Data Acquisition (SCADA) systems. This paper’s main achievements include the simulation of cyberattacks on existing electrical equipment from a petrochemical plant (case study), which consists of modifying the remote data transmitted by the SCADA system. Two locations were submitted to simulated cyberattacks that were considered critical for the overall plant operation. Furthermore, the changes that occur following each fault resulting from the cyberattack and the influence of the electrical parameter changes upon the process flow were analyzed. Furthermore, by using Electrical Power System Analysis Software—ETAP—the changes that occur following each fault due to the cyberattack and the influence of the electrical parameter changes upon the process flow were analyzed. By considering the two malfunction events, the resilience assessment of the system was analyzed. In the second case, only partial resilience action, up to 40%, restored the operability of the industrial power plant.

In this paper the authors applied analytical, and experimental procedures for investigating the operation of the three-phase induction motor (IM) energized from an unbalanced voltage supply and in the presence of harmonics. The main direction of investigation focuses on motor performance. The analytical model of the IM includes the effects of the voltage unbalance through the presence of positive and negative sequence parameters, as well as the effects of harmonics. The model takes into account the skin effect due to the presence of the higher frequency harmonics. The overall procedure proven to deliver a complete mapping of the IM operation, including the calculation of the unbalanced current, all categories of loss, developed torque, as well as the assessment of the harmonic effects. The final result of the work becomes useful in regards to IM rerating for the reason of preserving its lifespan.

The paper describes how a Direct Torque Control (DTC) drive technology has been applied to provide improved torque control of a Flying Dividing Shear (FDS) system in a steel rolling mill. The control system has a supervisory level ensured by a Programmable Logic Controller (PLC). The FDS is a highly dynamic, high speed application load and requires a high performance torque control drive for the purpose of the accuracy of the cutting process. During the FDS cutting mode, the bar profile has a very high linear speed, fact which represents a challenge the accuracy of the cut length. During the FDS cutting mode, depending on the bar length, the original DTC drive experienced overcurrent faults that cause production downtimes. A model of the overall system has been developed and has been used to provide the parameters for simulating the system. This has allowed the FDS operation to be analyzed and the FDS control system properly developed and tuned-up to obtain the required performance. The simulated DTC induction motor (IM) drive has been compared with the existing system from a steel plant. Measured data from the original system in the steel mill are compared with simulation results. This comparison shows that the system has been successfully simulated to determine a suitable agreement to the FDS operation. These measured and simulated results are also shown in the paper. Conclusions from this project are discussed.

This paper presents a comparison between results, for two methods of obtaining the values of "d-axis" synchronous reactance X _sd and "q-axis" synchronous reactance X _sq , of the permanent magnet synchronous motor with radial magnets (RPMSM). The paper provides a background describing the benefits of using the RPMSM machine and how the synchronous reactance parameters are valuable in determining stability and control algorithms for the machine. The two methods described are a load test under constant frequency conditions and Finite Element Analysis (FEA). Results obtained from the load tests, including the internal load angle δ, have been used to calculate X _sd and X _sq and represent their values with respect to the armature current and internal angle δ. Comparative results have been extracted using FEA. Good agreement between results is illustrated. Future developments conclude the paper.

The paper describes the determination of the parameters of a permanent magnet synchronous motor with radial magnets (RPMSM) as functions of power supply conditions and load. The description presents analysis of some steady state and transient performances together with limitations. Two methods are presented in the determination of the values of synchronous reactance for “d-axis” X _sd , respectively “q-axis” X _sq together with the evaluation of the core loss equivalent resistance R _c . The two methods described are a load test performed at the nominal frequency and Finite Element Analysis (FEA). The load tests results, including the direct determination of the internal load angle δ, represent the input of the calculation process for X _sd and X _sq . The synchronous reactance along each of the axes is then used to calculate the developed torque and compared with the torque values from direct measurements. Comparative results have been extracted using FEA and both methods illustrate a good agreement. In addition, FEA provided important indications in terms of maximum allowable current during operation, indicating the starting performance conditions also. The paper ends with an indication of the direction for future development.