Primož Sukič - Academia.edu (original) (raw)

Papers by Primož Sukič

Sensors, Oct 31, 2022

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Renewable energy & power quality journal, Jul 1, 2023

Automated decision tools, such as advanced energy management systems, are required to involve the... more Automated decision tools, such as advanced energy management systems, are required to involve the electrical grid users in energy flexibility services. This paper focuses on the prediction models as a substantial part of decision strategy in advanced energy management systems and on advanced energy management systems as a tool that supports the active involvement of electrical grid users in energy flexibility services. Prediction models' desired properties are self-establishing and self-adaptation, which require new solutions in data selection, filtering, processing and model learning. Some of these properties are investigated within this paper.

IEEE Transactions on Smart Grid, Jul 1, 2023

IEEE Transactions on Smart Grid

Renewable Energy and Power Quality Journal, 2012

The proposed paper deals with the calculation of the excessive transmission line losses caused by... more The proposed paper deals with the calculation of the excessive transmission line losses caused by the compact fluorescent lamps. The number of the installed compact fluorescent lamps is rapidly increased, nowadays. Since such a lamps have large impact on the power factor as well as on the voltage and current total harmonic distortion their inclusion to the low voltage electrical grid should be fully investigated. In the paper the numerical model, with nonlinear characteristics of compact fluorescent lamps inclusion, is dealt. The numerically analysis is performed for four different compact fluorescent lamps available on the Slovenian market.

Sensors

Modern LED light sources have many advantages, as well as some disadvantages. One of the disadvan... more Modern LED light sources have many advantages, as well as some disadvantages. One of the disadvantages is the pulsating luminous flux, which, in some cases, affects people’s health and well-being negatively. The paper describes the design and making process of a measuring system for determining the quality of LED substitutes for conventional light bulbs and gives an overview of LED light bulbs for household use. The measurement system is controlled using the MATLAB software environment, in which data processing and plotting of the results are also performed. We acquired 59 different LED light bulbs from 37 manufacturers, and performed the measurements. The light bulbs are classified based on the percentage of fluctuations in the luminous flux, and the percentage of deviation of the measured luminous flux compared to the value stated on the packaging by the manufacturer.

Delo obravnava vpliv povecanja stevila varcnih sijalk na faktor moci ter celostni harmonski popac... more Delo obravnava vpliv povecanja stevila varcnih sijalk na faktor moci ter celostni harmonski popacenji napetosti in toka. Analiza je izvedena na osnovi laboratorijskih meritev. Uporabljen je napetostni vir z majhnim harmonskim popacenjem. Zajemanje podatkov je izvedeno z ustreznimi napetostnimi in tokovnimi senzorji in krmilnim sistemom dSpace. Obdelava podatkov je izvedena v programskem paketu Matlab. Meritve in analize so izvedene za pet razlicnih varcnih sijalk, ki so dostopne na slovenskem trgu.

Delo opisuje nacrtovanje in izdelavo krmilnega sistema za srednje frekvencni sistem za uporovno t... more Delo opisuje nacrtovanje in izdelavo krmilnega sistema za srednje frekvencni sistem za uporovno tockovno varjenje. Obsega nacrtovanje in izdelavo elektronskih komponent, ki so potrebne za zajemanje podatkov iz senzorjev ter za proženje razsmernika. Jedro sistema predstavlja zmogljiv digitalni signalni krmilnik TMS320F28335, ki je bil graficno programiran v programskem paketu Matlab/Simulink. Uporabljen je sistem vodenja varilnega transformatorja, ki uposteva magnetne razmere v železnem jedru. Razvit je bil za detekcijo nasicenja železnega jedra varilnega transformatorja. Z njegovo uporabo v sistemu vodenja je mogoce prepreciti pojav nasicenja v železnem jedru varilnega transformatorja. Samo jedro pa je mogoce optimalno izkoristiti. Rezultati vodenja z razvitim krmilnim sistemom so pokazali, da je z njegovo uporabo mogoce izboljsati obratovalne lastnosti sistema za uporovno tockovno varjenje.

Energies, 2019

Progress in the development of LED technologies has reached a state which justifies the replaceme... more Progress in the development of LED technologies has reached a state which justifies the replacement of lighting with traditional light sources, not only in new buildings but also in existing, older ones. One of such replacements was used as an example of a lighting flicker study presented in this paper. The results of initial measurements indicated that Rapid Voltage Changes (RVCs) are the cause of light flicker. The procedure was introduced and described in this paper to provide the necessary actions to mitigate the light flicker in LED lighting. In order to fulfil this task, the source of locally induced voltage fluctuations has to be identified. A method of identification was developed and a multi-function office printer was identified as the source of RVCs. Using a less sensitive LED driver, changing the connection point of the interfering device, and improving the electrical installation were considered as a set of possible solutions. Laboratory measurements have shown signific...

Sensors, 2017

Clouds moving at a high speed in front of the Sun can cause step changes in the output power of p... more Clouds moving at a high speed in front of the Sun can cause step changes in the output power of photovoltaic (PV) power plants, which can lead to voltage fluctuations and stability problems in the connected electricity networks. These effects can be reduced effectively by proper short-term cloud passing forecasting and suitable PV power plant output power control. This paper proposes a low-cost Internet of Things (IoT)-based solution for intra-minute cloud passing forecasting. The hardware consists of a Raspberry PI Model B 3 with a WiFi connection and an OmniVision OV5647 sensor with a mounted wide-angle lens, a circular polarizing (CPL) filter and a natural density (ND) filter. The completely new algorithm for cloud passing forecasting uses the green and blue colors in the photo to determine the position of the Sun, to recognize the clouds, and to predict their movement. The image processing is performed in several stages, considering selectively only a small part of the photo rel...

Renewable Energy and Power Quality Journal, 2016

The paper deals with photovoltaic (PV) systems able to generate reactive power and to curtail act... more The paper deals with photovoltaic (PV) systems able to generate reactive power and to curtail active power generation. Based on measurements performed on an existing PV system over 10 years its typical yearly operation profile is determined. It is used to evaluate the ability of the PV system to generate reactive power. After that the efficiency characteristic of a micro-inverter is determined experimentally. It is described as a function of generated active and reactive powers. This function is afterwards used in an optimization procedure, where measured time dependent load and power generation profiles are applied to determine optimal reactive power generation in PV systems installed in an existing low voltage network. Based on calculations performed over one year, the impact of reactive power generation on yearly production of electrical energy in PV systems is evaluated.

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2017

Purpose This paper aims to present two hysteresis-control algorithms designed for medium-frequenc... more Purpose This paper aims to present two hysteresis-control algorithms designed for medium-frequency, direct-current, resistance-spot-welding (MFDC RSW) systems. The first proposed control algorithm (MSCHC) eliminates the short switching cycles that can occur when using the existing hysteresis-control algorithms. This control minimises the number of switching cycles that are needed to generate the selected welding current. The welding-current ripple can be high when using this control algorithm. Therefore, a second algorithm (HCRR) is presented that reduces the welding-current ripple by half. Design/methodology/approach The proposed hysteresis controllers consist of the transformer’s magnetic-flux-density hysteresis regulator and a welding-current hysteresis regulator. Therefore, the welding current must be measured and the saturation of the iron core must be detected. The proposed hysteresis controller supplies the inverter with the signals needed to generate the supply voltage for t...

Z vecanjem deleža fotonapetostnih elektrarn v elektroenergetskem omrežju se veca tudi vpliv le-te... more Z vecanjem deleža fotonapetostnih elektrarn v elektroenergetskem omrežju se veca tudi vpliv le-teh. Fotonapetostne elektrarne lahko imajo negativen vpliv predvsem na distribucijsko omrežje. Hitri prehodi oblakov povzrocajo hitre spremembe v izhodni moci fotonapetostnih elektrarn, kar lahko povzroca fluktuacije napetosti, to pa za elemente omrežja ni najbolje. Trenutno obstajata dve ucinkoviti resitvi, to sta ojacitev omrežja in vgradnja hranilnikov energije. Obe imata tudi negativno lastnost, to je zelo visoko ceno. V doktorski disertaciji je predstavljena, zasnovana in do stopnje funkcionalnega prototipa razvita resitev, s katero se hitrih sprememb v izhodni moci fotonapetostnih elektrarn sploh ne ustvarja. Bistvo predlagane resitve je preprecevanje nastanka hitrih sprememb v izhodni moci fotonapetostnih sistemov, zato blaženje posledic, ki je znacilno za obstojece resitve, ni potrebno. Celoten sistem je sestavljen iz sistema za napoved prehoda oblakov, vodenja posameznih mikropret...