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Introduction
EV grid integration, residential battery storage, power quality, EAF calculation and optimization, cleaner production, optimization techniques
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October 1995 - April 2021
Publications
Publications (60)
As European car manufacturers increasingly commit to fully electric vehicles in alignment with the European Green Deal and EU climate targets, the transition from internal combustion engines to electric vehicles necessitates a new skill set for engineers, particularly in Southeastern Europe. This paper examines the integration of industry feedback...
This paper presents a mixed-integer linear programming optimization model of a renewable energy community comprised of members with local generators, battery energy storage systems, electric vehicles, and heat pumps and thermal energy storage, thus representing a local multi-energy system. The goal of the paper is to analyze the impact of different...
Energy communities can take different measures to improve the economic savings derived from energy sharing, such as optimally aggregating members with diverse generation and load profiles or by shifting electricity demand throughout the day. Nevertheless, the magnitude of the cost savings from energy sharing are always bound by exogenous factors, s...
The financial benefits of energy sharing within a community are impacted by factors within the control of the community, such as internal rules for energy sharing, and by external factors, such as regulatory frameworks and fiscal policies. While much of the literature on energy sharing has focused on internal rules, there has been less attention pa...
The energy shared through collective self-consumption determines the economic savings of an energy community and the revenue losses of its electricity supplier. In this paper, we statistically explore this quantity, based on a sample of 200 hypothetical energy communities. It is found that a typical community shares (4.69 ± 1.26) % of the annual ge...
In recent years, a growing number of prosumers are beginning to form coalitions to jointly invest in renewable energy projects and share energy among themselves, either through peer-to-peer markets or collective self-consumption. The aim of this paper is to evaluate the fairness of three methods that can be used to financially settle the energy sha...
This paper proposes an energy sharing method for collective self-consumption called virtual net-billing. The proposed method enables the members of an energy community to fairly share energy in real-time, based on their individual contribution. To achieve this, a mathematical model is developed, which separates the total self-consumption of the com...
This paper proposes an energy sharing method for collective self-consumption called virtual net-billing. The proposed method enables the members of an energy community to fairly share energy in real-time, based on their individual contribution. To achieve this, a mathematical model is developed, which separates the total self-consumption of the com...
Due to the potential for deploying distributed generation, improving energy efficiency and adopting sustainable energy-related practices, consumers provide significant value in the energy sector transformation. If their interests and goals are similar, they can group together and form energy communities. Energy communities enable consumers to joint...
The Agenda 2030 defines 17 Sustainable Development Goals (SDGs) that act as a common global framework when pursuing economic development alongside reduced environmental damage and social equality. Achieving sustainable communities is related to one of these goals. In that context, energy communities have been introduced as legal entities that empow...
Grid impact indicators hold valuable information
about a prosumer when interpreted carefully. This makes them
quite useful for benchmarking different demand side management
schemes and studying active buildings. In this paper,
the effects that battery storage has on five such indicators
have been addressed in detail. Their values were calculated by...
Coupling batteries with photovoltaic generators in buildings can improve the building’s self-consumption and reduce its reliance of the grid. To quantify the effects of different battery charge/discharge rates on self-consumption and peak power exchange, four grid impact indicators have been analyzed – self-sufficiency rate, self-consumption rate,...
This paper demonstrates a procedure for calculating stress and temperature in
the secondary high current circuit of a modern electric arc furnace. At the
beginning, the separate parameters that form the electric circuit from the
furnace to the bushings of the electrodes are determined. The analysis of
these parameters allows the selection of the op...
In order to determine the most suitable storage system for buildings with photovoltaic generators (PVs), a holistic analysis of the energy consumption is often required. In that sense, this paper provides a comparative assessment of thermal and battery storage in the context of nearly zero energy buildings (NZEBs). A NZEB with a PV, heat pump and a...
The paper presents procedure of stress and temperature calculations in the delta closure plates of an electric arc furnace. At the beginnig, the separate parameters that form the furnace circuit impedance have been determined. To get better insight of the operating conditions of the arc furnace, thermal and stress analysis of the secondary delta cl...
Abstract—Electric cars in the worldwide vehicle stock have reached sizeable growth since 2010. Besides proven benefits to the sustainable development and wheel-to-wheel efficiency, electric cars can provide side benefits to car owners and to power system utility. Plug-in vehicles can behave either as loads or as a distributed energy and power resou...
The paper presents the procedure of electric arc furnace secondary circuit calculations. The separate parameters that form the furnace circuit impedance have been determined. The operating current for given power factor has been calculated and verified. To get better insight of the operating conditions of the arc furnace, thermal and stress analysi...
The hosting capacity, frequently defined as amount of distributed generation that can be connected to a certain location without resulting in an unacceptable quality or reliability for other customers, is limited. To know how much distributed generation can be connected in the grid it is important to define appropriate performance indicators. In th...
The penetration of distributed generation in the power systems increases rapidly. However, the amount of distributed generation that can be connected to a certain location without resulting in an unacceptable quality or reliability for other customers is limited. To know how much distributed generation can be connected it is important to define app...
With increasing amounts of wind power connected, the power system is impacted in a number of ways. In this paper, the emphasis is on one of those impacts: the harmonic and interharmonic emission from wind-power installations. The emission of individual wind turbines as well as from a wind park has been studied. The spectrum as a function of active-...
The paper analyses the measured emission from
four individual modern turbines of about 2MW size equipped
with power electronics. The four turbines show different long
term spectra and their spectra also show different variations with
time. The harmonic emission from individual turbines consists of
harmonic and interharmonic spectra. This emission w...
The paper analyses the measured emission from four individual modern turbines of about 2MW size equipped with power electronics. The four turbines show different long term spectra and their spectra also show different variations with time. The harmonic emission from individual turbines consists of harmonic and interharmonic spectra. This emission w...
This paper presents the messages to the stakeholders on voltage-dip immunity as extracted by UIE WG2 from CIGRE TB412 [1]. The paper summarizes the main recommendations from this technical brochure in the form of messages towards regulators, standard-setting-organizations, network operators, industrial customers, equipment manufacturers, and power...
This paper presents the messages to the stakeholders on voltage-dip immunity as extracted by UIE WG2 from CIGRE TB412 [1]. The paper summarizes the main recommendations from this technical brochure in the form of messages towards regulators, standard-setting-organizations, network operators, industrial customers, equipment manufacturers, and power...
The paper will show a procedure for optimal computer aided design of two special transformers: resistance welding transformer (RWT) and combined current-voltage instrument transformer (CCVIT). An optimization tool based on the genetic algorithm will be used. The electromagnetic parameters of both transformers will be calculated by using the finite...
The paper presents the main recommendations to stakeholders from the international CIGRE/CIRED/UIE joint working group C4.110 aimed at improving the understanding of the compatibility between installations and the electricity supply.
This paper presents some of the results from an international working group on voltage-dip immunity. The working group has made a number of recommendations to reduce the adverse impact of voltage dips. Specific recommendations to researchers and manufacturers of power-electronic equipment are: considering all voltage dip characteristics early in th...
This paper shows measurements of the emission of harmonics by a small windpark. The spectrum consists of the characteristic harmonics associated with six-pulse converters and a broadband spectrum covering frequencies at which emission normally is not present. These frequencies are caused by the switching pattern of the power-electronics converters....
This paper presents the results from the work of WG C4.110, a joint working group by CIGRE, CIRED and UIE. Its mandate period stretched from early 2006 through early 2009. The group has addressed several aspects of the immunity of, especially, industrial equipment against voltage dips. Compared to the work earlier groups, the equipment performance...
The paper presents a numerical method based on the finite elements to model the electromagnetic phenomena in two different special transformers. 2D FEMM model of existing resistance welding transformer will be verified with experimental test results. The combined instrument transformer will be modeled and calculated with original FEM-3D program dev...
In the paper original methodology for nonlinear electromagnetic transient analysis of special transformers will be given. A universal nonlinear transformer model will be developed by using the finite element method study results. The electromagnetic field analysis will be done by applying the original program package FEM-3D developed at the Faculty...
This paper presents a transformer model that is useful for lowfrequency applications. To describe the iron-core magnetic behavior, the Jiles Atherton hysteresis model is used, which is able to generate minor asymmetric loops and remanent flux. The obtained results are compared with those measured in the laboratory on a commercial resistance welding...
This paper proposes a novel design of resistance welding transformer that is based on optimization of existing transformer. A GA strategy is used to obtain the optimum value of the objective function. Compared to the existing transformer, the novel transformer has decreased dimension and weight of the transformer for 16,8%, decreased number of tap...
This work uses the thermal-electrical analogy that was coupled with the steady-state electromagnetic FEM results to model the temperature distribution of a resistance-welding transformer. It is based on classical heat transfer theory applying electrical analogy to calculate the thermal distribution. Consequently, the conduction thermal resistances...
1 2. FUNDAMENTALS AND COMPONENTS OF RESISTANCE WELDING Resistance welding is a process used to join metallic parts by means of clamping force and heat generated with electric current. There are several forms of resistance welding, including spot welding, seam selding, projection welding, and butt welding. In all forms of resistance welding, the wor...
The resistive welders are highly fluctuating nonlinear loads that consume a large amount of apparent power. Although the operation of this type of machines can cause different types of system disturbances, this work investigates the impact of the phase controlled resistance welding machines (PCRWM) over the distribution losses. The investigation fo...
The paper deals with the application of the PSPICE for simulation of a resistance welding transformer. The basic steps in developing any PSPICE transformer model are briefly explained. Then the described procedure is applied for derivation of an accurate PSPICE simulation model of a spot resistance welding transformer with primary side phase contro...
The paper deals with a methodology for determination of the magnetizing circuit parameters of a transformer. The methodology is described in full for a general case of a loaded transformer. Later it is used for determination of the magnetizing circuit parameters of a spot resistance welding transformer. However, the procedure is applicable to any p...
The paper deals with the novel methodology for application of a PSPICE simulation model of a loaded transformer, suggesting some of its possibilities in prediction of the transformers behaviour. A set of initial experimental measurements over the real transformer is requested in order to find out the component values for the simulation model. The P...
The paper treats a very important aspect of the design of an electromagnetically compatible product -the "crosstalk". In order to understand how to model crosstalk, the fundamental theory and assumptions are presented. A brief dis-cussion on the frequently used analysis methods is given. Throughout the text, a full wave program that uses the method...
