Vektorsko upravljanje dvostruko pobuđenim sinkronim strojem kao integriranim starterom-alternatorom

The paper proposes a double excited synchronous machine as integrated starter--alternator for future automobiles applications. Particularly, the biaxial excitation synchronous machine (BESM) is proposed for its high efficiency and wide constant power speed range. As the integrated starter--alternator system combines both starter and generator functions in a single electric machine, an alternative vector control strategy for BESM is developed and detailed to allow operation in the two modes at unity power factor operation by setting d-axis current to be zero and q-axis current to be constant and equal to its value that cancel the q-axis flux. In such conditions, the BESM torque can be controlled by the dc-excitation current and the required dc-bus voltage can be regulated within the 42V PowerNet specifications. To overcome the slowness dc-excitation current response, which is due to higher dc-field excitation time constant, and to increase the torque response quickness, the control of the magnetising current is proposed instead of the d-axis current. Implementation and simulation results validate the proposed scheme and provide a practical solution for an integrated starter-alternator.U radu je predložena upotreba dvostruko pobuđenog sinkronog stroja kao integriranog startera-alternatora, za buduće primjene u automobilskoj industriji. Preciznije, predložena je upotreba biaksijalno pobuđenog sinkronog stroja (BESM) zbog visoke korisnosti i širokog raspona područja konstantne snage. Kao integrirani starter-alternator, sustav kombinira funkcije i startera i generatora u jednom električnom stroju. Razvijen je i detaljno opisan alternativni pristup vektorskom upravljanju BESM-om za omogućavanje rada u dva moda uz jedinični faktor snage postavljanjem d-osi struje u nulu i q-osi struje na konstantnu vrijednost koja poništava tok u q-osi. U ovakvim uvjetima, BESM momentom moguće je upravljati istosmjernom uzbudnom strujom i traženi napon dc-sabirnice moguće je regulirati unutar 42V PowerNet specifikacija. Za prevladavanje sporog odziva na istosmjernu uzbudnu struju koji nastaje zbog veće vremenske konstante magnetskog polja uzbude, a s ciljem ubrzanja odziva momenta, predloženo je upravljanje strujom magnetizacije umjesto strujom u d-osi. Implementacijski i simulacijski rezultati potvrđuju predloženi pristup i pružaju praktično rješenje za integrirani starter-alternator

Modeling and Simulation of a Photovoltaic Field for 13 kW

In the future solar energy will be very important source of energy. More than 45% of needed energy in the world will be generated by photovoltaic module. Therefore it is necessary to concentrate our efforts in order to reduce the application costs .This work investigates on the modeling of a Stand Alone Power System focusing on Photovoltaic energy systems. We introduce the models of the system components Therefore a maximum power point tracking (MPPT) technique is needed to track the peak power in order to make full utilization of PV array output power under varying conditions. This paper presents two widely-adopted MPPT algorithms, perturbation & observation (P&O) and incremental conductance (IC).A complete characterization and simulation model was implemented in the Matlab-Simulink environment. Design complete system is done to analyze its behavior for a typical year, with the aim to evaluate their energetic effectiveness

Modeling of glow discharge in dielectric barrier

701-712Numerical calculations of spatio-temporal characteristics of the homogeneous dielectric barrier discharge (DBD) in pure helium have been performed by means of a one-dimensional fluid model. The influence of the elementary processes on the discharge behavior has been studied by variation of the corresponding rate constants. The simulation and the analytical interpretation have been carried out for two basic modes of the homogeneous barrier discharge. The specificity of the glow discharge is the development of a cathode region and a positive column during the breakdown, as well as the presence of quasi-neutral plasma in subsequent phases. The positive column occurs because the shielding of the external field by the plasma is not instantaneous. The dependence of the discharge behavior on the external parameters, such as, the amplitude and frequency of the applied voltage, discharge gap width and thickness of dielectric barriers has been analyzed

Experimental investigation on dielectric/electric properties of aged polymeric insulator: correlation of permittivity and dielectric loss tangent with surface hydrophobicity

Silicone rubber (SiR) insulators are widely used in transmission and distribution electrical power systems. Dielectrics properties give an important efficiency to SiR insulators that can be lost after ageing. The aim of this study is to investigate the effect of temperature, immersion and ultraviolet (UV) radiation on the ageing phenomenon of SiR insulator samples. The evolution of bulk condition of the samples after the ageing cycle was diagnosed by broadband dielectric spectroscopy measurement, a correlation between dielectric properties and the surface hydrophobicity of the samples has been discussed. DC surface resistivity was measured after ageing. A comparison was made between the characteristics of the samples in the new state and the aged one. Experimental results show that the low frequency dispersion dominates the dielectric response of the studied material. The thermal ageing causes a decrease of the dielectric loss tangent (DLT) in the low frequencies which improves the FOV of the aged samples. UV radiation can cause a change in the physicochemical structure of the samples, not only at the surface but also at the bulk level. The immersion ageing results in an increase in the DLT, especially for low conductivity solutions. The water can diffuse inside the samples during the immersion. In fact, a limited amount of water can still reside inside the samples even after a long period of drying. There is a good agreement between the surface hydrophobicity and the dielectric properties of the samples, the link with these properties is dependent to the ageing stress

Abstracts of the First International Conference on Advances in Electrical and Computer Engineering 2023

This book presents extended abstracts of the selected contributions to the First International Conference on Advances in Electrical and Computer Engineering (ICAECE'2023), held on 15-16 May 2023 by the Faculty of Science and Technology, Department of Electrical Engineering, University of Echahid Cheikh Larbi Tebessi, Tebessa-Algeria. ICAECE'2023 was delivered in-person and virtually and was open for researchers, engineers, academics, and industrial professionals from around the world interested in new trends and advances in current topics of Electrical and Computer Engineering. Conference Title: First International Conference on Advances in Electrical and Computer Engineering 2023Conference Acronym: ICAECE'2023Conference Date: 15-16 May 2023Conference Venue: University of Echahid Cheikh Larbi Tebessi, Tebessa-AlgeriaConference Organizer: Faculty of Science and Technology, Department of Electrical Engineering, University of Echahid Cheikh Larbi Tebessi, Tebessa-Algeri