Energija, ekonomija, ekologija最新文献_第2页

Analiza uticaja ispada proizvodnih jedinica u TENT A i B na gubitke u prenosnom sistemu Srbije TENT A 和 B 生产单位对塞尔维亚输电系统的影响分析

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.75b

Kovica Bibić, I. Stamenić, Tomislav Rajić

引用次数: 0

Security of Supply as a Major Part of the Energy Security Puzzle 供应安全是能源安全难题的重要组成部分

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.28m

Aleksandar Madžarević, M. Crnogorac

引用次数: 1

Optimalno planiranje balansne rezerve za pokrivanje debalansa u proizvodnji vetroelektrana u Južnom Banatu

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.38r

Milica Radovanović, Željko Đurišić

引用次数: 0

Procena mesta nastanka kvara na električnom vodu primenom veštačkih neuralnih mreža

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.68z

Milorad Zakić, G. Kvascev

引用次数: 0

Razvoj metodologije za utvrđivanje optimalne snage fotonaponske elektrane postavljene na nagnutom terenu

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.47d

Vladan Durković, Željko Đurišić

引用次数: 0

Optimalno pozicioniranje sinhrofazorskih jedinica primenom genetičkog algoritma

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.22o

Katarina Obradović, Goran Dobrić

{"title":"Optimalno pozicioniranje sinhrofazorskih jedinica primenom genetičkog algoritma","authors":"Katarina Obradović, Goran Dobrić","doi":"10.46793/eee22-4.22o","DOIUrl":"https://doi.org/10.46793/eee22-4.22o","url":null,"abstract":"Energy transition implies a larger share of the intermittent renewable energy sources connected to the power grid. These utilities can change their production within a short period of time, thus, significantly affecting the voltage conditions and load flows in the grid. This adds to the complexity in achieving required reliability and stability of the system. Proper and timely insight into the grid parameters plays an important role in regulation of such power system. Implementation of Phasor Measurement Units (PMUs) provides information about electrical parameters of the grid with as much as microsecond precision. Therefore, possible occurring dynamical processes could also be observed and regulated in a proper manner. Considering PMU can give information regarding voltage phasor as well as currents of adjacent branches, the observability of the system can be achieved even if some nodes are not equipped with their own PMU. Furthermore, installation of PMU in every node is not economical solution considering the size of the power grid and the number of PMUs accordingly. One should assess the sufficient number of PMUs cautiously and locate them carefully in order to maintain observability, but also to reduce expenses as much as possible. In the grid topology with a vast number of nodes and branches, the usage of metaheuristic optimization algorithms with adequate criteria function and limiting conditions could reduce the computing time compared to the linear and non-linear programming algorithms. In addition, the quality of such solution is also preserved. In this paper, the usage of genetic algorithm is proposed in order to determine the number and position of PMUs for several different grid samples.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125285985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rekonfiguracija distributivne mreže i otočna kompenzacija uz prisustvo vetro generatora

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee21-4.45s

Branko Stojanović, Tomislav Rajić, Darko Šošić

{"title":"Rekonfiguracija distributivne mreže i otočna kompenzacija uz prisustvo vetro generatora","authors":"Branko Stojanović, Tomislav Rajić, Darko Šošić","doi":"10.46793/eee21-4.45s","DOIUrl":"https://doi.org/10.46793/eee21-4.45s","url":null,"abstract":"In this paper, the distribution network reconfiguration with simultaneous capacitor switching, in the presence of wind generators, by Simulated Annealing (SA) is presented. Analysed test network has 69 nodes including the slack one and 73 branches, all of which can commutate. Following assumptions are made: load in nodes is changed according to Gauss distribution and wind generator power with Weibull one, every hour, then there are two wind generators of 200 kW maximum power each (10% of total, nominal active power load) and they can be allocated to any node but the slack one. The same is valid for the capacitor banks regarding allocation. This switching logic is unrealistic. On its basis more realistic one was issued with fixed nodes for allocation of wind generators and capacitor banks (the most frequently visited nodes), by Monte Carlo graphical method. Input power factor is to be greater than 0.85 which is not fulfilled with commencing configuration (from the start) so that allocation of capacitor banks is mandatory. Another constraint is that the network should not be overcompensated. Four realistic scenarios are investigated. In the first one only network with wind generators is analysed and the rest are dedicated to all possible combinations of the regulation. The programme is automated indicating the price of configuration, generated banks, input data (active and reactive load, power and location of wind generators) and savings which change on an hourly basis. The wind generators are uniformly distributed in accordance to nodes (for the less realistic scenario) and generate only active power complying with Weibull distribution. The graphical results are presented for a 1000-hour operation (operation in one thousand hours, every hour different) and the analysis is done for a thousand-hour work. The presented method shows that considerable savings can be achieved by simultaneous application of reconfiguration method and capacitor switching with already allocated wind generators.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125248066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analiza kvaliteta električne energije na satnom nivou kod priključenja elektrana na obnovljive izvore energije

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.80z

Miroslav Žerajić, Milan Stojanović

{"title":"Analiza kvaliteta električne energije na satnom nivou kod priključenja elektrana na obnovljive izvore energije","authors":"Miroslav Žerajić, Milan Stojanović","doi":"10.46793/eee22-4.80z","DOIUrl":"https://doi.org/10.46793/eee22-4.80z","url":null,"abstract":"Analyses necessary for the new power plant connection contain the following power quality analyses carriedout using the simulation model: Estimation of the emission level of the voltage waveform asymmetry at the point of connection, estimation of the high harmonic components at the connection point and estimation of the emission level of long-term and shortterm flicker. Limits for the previously mentioned parameters have been defined in the National Grid Code (at the national level) or in the international standards. According to the international standards, the limit is considered violated if the duration of the parameter value violation exceeds 5% of the monitored period. Conventional approach of power quality analysis through software tool assumes only analysis for the most critical regime: when the short-circuit power at the point of connection is the lowest and the new power plant produces maximum active power. Based on this approach mitigation measures for improving power quality supply are sometimes suggested to the plant investor. In should be noted that Renewable Energy Sources (RES) do not have maximum output power during the whole year, and consequently, power quality deterioration is much less than in the critical regime observed in the simulations. For power quality simulation purposes, technical sheets of the equipment contain high harmonic levels for the full operation range are used from which usually the worst (highest) harmonic injections are considered for modelling RES as a harmonic source. In this paper, the results of power quality analyses for the RES connection using hourly resolution data for the one-year period based on DPL (DIgSILENT Programming Language) in DIgSILENT PowerFactory software package will be presented. This approach gives the duration of the limit violation, and consequently, more reliable results in comparison with the results of the conventional approach.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114220867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analiza rada solarne elektrane u NTP Čačak – System Advisor Model (SAM) modelovanje i poređenje sa stvarnim rezultatima

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.52d

S. Dragićević, V. Vujičić, M. Marjanović

引用次数: 1

Long Term Planning of Macedonian Electricity Supply 马其顿电力供应的长期规划

Energija, ekonomija, ekologija Pub Date : 2022-12-01 DOI: 10.46793/eee22-4.85c

A. Chaushevski, Sofija Nikolova-Poceva

{"title":"Long Term Planning of Macedonian Electricity Supply","authors":"A. Chaushevski, Sofija Nikolova-Poceva","doi":"10.46793/eee22-4.85c","DOIUrl":"https://doi.org/10.46793/eee22-4.85c","url":null,"abstract":"In the paper alternatives for expansion of the Macedonian electricity supply system are presented. MESSAGE tool is used for modelling the system, for developing the scenarios, to analyse cost optimal energy pathways and to determine the optimal electricity generation technology mix. The calculations for the period 2020-2050 are made in a 5-year interval. Two scenarios are developed: Scenario 1 – BAU (Business as Usual) scenario, where the current energy structure prevailed, with trends like the current development. The electricity demand is satisfied by coal-fired thermal power plants, gas-fired thermal power plants, hydro power plants and renewable power plants. Scenario 2 – Green scenario, where gas-fired thermal power plants and nuclear power representative with small modular reactors are base load technologies, and also intensive construction of production capacities on renewable energy sources is forced. By making further analysis, the possibility of flexibility in the construction of new facilities within the interval, economic indicators, and appropriate impact on the environment are obtained. In order to make an economic analysis for a particular technology, calculations are made for parameters that are standard for projects, such as: net present value, benefit – cost ratio, payback period and internal rate of return. The environmental impact is analysed of aspect of CO2 emissions.","PeriodicalId":236996,"journal":{"name":"Energija, ekonomija, ekologija","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130005840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0