Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021160
G. Dimov, S. Tzvetkova, Angel Petleshkov, Yavor Lozanov
The paper presents a study on the impact of investments in ensuring the quality of electric energy and power supply in distribution networks Medium Voltage (MV). An analysis of the costs of ensuring the quality of electrical energy in regions with a predominantly overhead and cable network covering a five-year period has been made.
{"title":"Analysis of the impact of current investments on the quality of electricity supply in electricity distribution networks","authors":"G. Dimov, S. Tzvetkova, Angel Petleshkov, Yavor Lozanov","doi":"10.1109/BulEF56479.2022.10021160","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021160","url":null,"abstract":"The paper presents a study on the impact of investments in ensuring the quality of electric energy and power supply in distribution networks Medium Voltage (MV). An analysis of the costs of ensuring the quality of electrical energy in regions with a predominantly overhead and cable network covering a five-year period has been made.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116138415","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021196
P. Stoev, Nikolay Matanov
In the work, a simulation model of a street lighting system with LED lighting was prepared. The model emulate the operation of the installation in a normal mode and when dimming the light flux. The development has a wide field of application - both for the study of energy efficiency under different control options, and for the evaluation of the distribution of current harmonics generated by the lighting installation.
{"title":"Simulation Model of a Street Lighting System with LEDs","authors":"P. Stoev, Nikolay Matanov","doi":"10.1109/BulEF56479.2022.10021196","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021196","url":null,"abstract":"In the work, a simulation model of a street lighting system with LED lighting was prepared. The model emulate the operation of the installation in a normal mode and when dimming the light flux. The development has a wide field of application - both for the study of energy efficiency under different control options, and for the evaluation of the distribution of current harmonics generated by the lighting installation.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121831661","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021153
Nikolay Matanov, Atanas Zahov, I. Angelov
In the first part of the report, a charging/discharging model of a Li-ion battery powered by an ideal DC voltage source is presented. The model allows the operation of the battery in two modes - grid to vehicle $(mathrm{G}2mathrm{V})$ and vehicle to grid $(mathrm{V}2mathrm{G})$. Switching between the two modes can be done at any time in both directions, while simultaneously adjusting (setting) the charge/discharge current of the battery. In this second part of the report, a brief overview of the technical parameters of EV batteries and charging stations, as well as the trends of their development and use, is made. In addition, the Li-ion battery charging/discharging model has been further developed, with the power supply being from the medium voltage grid and a transformer substation. A reversible inverter is added to the elements of the charging station, and a conventional load is also included to the substation. The model allows the station to operate in two modes: $mathrm{G}2mathrm{V}$ and $mathrm{V}2mathrm{G}$. The results of the simulations are presented.
{"title":"Modeling of the Electric Vehicle Charging Process - Part 2","authors":"Nikolay Matanov, Atanas Zahov, I. Angelov","doi":"10.1109/BulEF56479.2022.10021153","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021153","url":null,"abstract":"In the first part of the report, a charging/discharging model of a Li-ion battery powered by an ideal DC voltage source is presented. The model allows the operation of the battery in two modes - grid to vehicle $(mathrm{G}2mathrm{V})$ and vehicle to grid $(mathrm{V}2mathrm{G})$. Switching between the two modes can be done at any time in both directions, while simultaneously adjusting (setting) the charge/discharge current of the battery. In this second part of the report, a brief overview of the technical parameters of EV batteries and charging stations, as well as the trends of their development and use, is made. In addition, the Li-ion battery charging/discharging model has been further developed, with the power supply being from the medium voltage grid and a transformer substation. A reversible inverter is added to the elements of the charging station, and a conventional load is also included to the substation. The model allows the station to operate in two modes: $mathrm{G}2mathrm{V}$ and $mathrm{V}2mathrm{G}$. The results of the simulations are presented.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124151578","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021174
Kristina Hadzhiyska, Dimo Stoilov
This article aims to present possible criteria for evaluating scenarios for energy development, gives a discussion on their significance and proposes their qualitative descriptions. On the bases of an extensive literature review we prove that long- term energy planning and multi-criteria decision-making are enriched with using the scenario analysis.
{"title":"Criteria for Evaluation of Scenarios for National Energy System Development","authors":"Kristina Hadzhiyska, Dimo Stoilov","doi":"10.1109/BulEF56479.2022.10021174","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021174","url":null,"abstract":"This article aims to present possible criteria for evaluating scenarios for energy development, gives a discussion on their significance and proposes their qualitative descriptions. On the bases of an extensive literature review we prove that long- term energy planning and multi-criteria decision-making are enriched with using the scenario analysis.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128882541","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021199
Dimo Siderov, R. Stanev, Kostadin Viglov, V. Efthymiou, C. Charalambous, S. Khadem, S. Patra
This paper presents an overview of the Low Voltage Direct Current (LVDC) networks classification, paradigms, schemes, main technical solutions, equipment and technologies. Based on a literature survey, some of the most significant hindering factors for the widespread implementation of LVDC are outlined. Taking into account the current state of the art LVDC networks and gaps present, an analysis of the main future trends is performed. Furthermore, this study identifies difficulties and potential trends for LVDC adoption.
{"title":"A Review of State of the Art Low Voltage Direct Current Networks Development","authors":"Dimo Siderov, R. Stanev, Kostadin Viglov, V. Efthymiou, C. Charalambous, S. Khadem, S. Patra","doi":"10.1109/BulEF56479.2022.10021199","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021199","url":null,"abstract":"This paper presents an overview of the Low Voltage Direct Current (LVDC) networks classification, paradigms, schemes, main technical solutions, equipment and technologies. Based on a literature survey, some of the most significant hindering factors for the widespread implementation of LVDC are outlined. Taking into account the current state of the art LVDC networks and gaps present, an analysis of the main future trends is performed. Furthermore, this study identifies difficulties and potential trends for LVDC adoption.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117201855","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10020200
G. Ivanova, V. Gyurov, Milen Duganov, S. Rachev
The report presents a simulation study of a hybrid SAVe CUBE marine power system that is parameterized with an existing ships architecture. Hybrid marine power systems are a new technical solution that raises new questions about power quality, electromagnetic compatibility and estimation of power and power losses. Their main purpose is to limit the spread of higher current and voltage harmonics, but the implementation of additional units is related to the use of advanced methods for analyzing electricity consumption. The results of the study can be useful for specialists in the field of operation of ship electrical power systems.
{"title":"Simulation Study of Power Consumption Modes of Hybrid SAVe Cube Ship Electrical Power Systems","authors":"G. Ivanova, V. Gyurov, Milen Duganov, S. Rachev","doi":"10.1109/BulEF56479.2022.10020200","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10020200","url":null,"abstract":"The report presents a simulation study of a hybrid SAVe CUBE marine power system that is parameterized with an existing ships architecture. Hybrid marine power systems are a new technical solution that raises new questions about power quality, electromagnetic compatibility and estimation of power and power losses. Their main purpose is to limit the spread of higher current and voltage harmonics, but the implementation of additional units is related to the use of advanced methods for analyzing electricity consumption. The results of the study can be useful for specialists in the field of operation of ship electrical power systems.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123318987","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021157
M. Georgiev, Alexandra N. Georgieva, D. Gospodinova
This article presents an analysis of the possibilities of using a hybrid system consisting of a photovoltaic installation and energy storage in the form of hydrogen, used only in off-grid mode. This system to be implemented in buildings with an irregular energy profile to maximize the utilization of the generated solar energy and increase the share of green energy in buildings with non-standard energy consumption.
{"title":"Analysis of the Possibilities for the Utilization of Photovoltaic Energy and the Use of a Hydrogen Installation for Energy Storage in Buildings","authors":"M. Georgiev, Alexandra N. Georgieva, D. Gospodinova","doi":"10.1109/BulEF56479.2022.10021157","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021157","url":null,"abstract":"This article presents an analysis of the possibilities of using a hybrid system consisting of a photovoltaic installation and energy storage in the form of hydrogen, used only in off-grid mode. This system to be implemented in buildings with an irregular energy profile to maximize the utilization of the generated solar energy and increase the share of green energy in buildings with non-standard energy consumption.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115238228","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021180
S. Omar, Daniel Dobrilov
A new approach of tripping single-phase faults in networks with an isolated star center to preserve the operation of compressors in the event of a fault is considered. A solution was found for tripping compressors by the protection relay in case of external damage to the plant's power supply network.
{"title":"Particularities in the calculation of the relay protection settings of MV motors driving compressors","authors":"S. Omar, Daniel Dobrilov","doi":"10.1109/BulEF56479.2022.10021180","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021180","url":null,"abstract":"A new approach of tripping single-phase faults in networks with an isolated star center to preserve the operation of compressors in the event of a fault is considered. A solution was found for tripping compressors by the protection relay in case of external damage to the plant's power supply network.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116861363","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10020199
D. Nikolova, Dimo Stoilov
The article presents analysis of the potential for increased household energy efficiency, diversification of suppliers and renewable hydrogen production, as potential drivers towards greater European energy independence. It is a companion piece to an article [1] that we presented at the 14th BulEF conference on the Russo-Ukrainian conflict and its implications for a deepening of European energy integration. In our upcoming work, we present the relevant statistical data and develop projections, regarding the likelihood of achieving energy independence only through these three strategic approaches. Our conclusion is that it is highly unlikely that gains in these areas alone would be sufficient to offset the loss of Russian energy imports by the year 2030, as pledged by the Commission on March 8, 2022.
{"title":"Household Energy Efficiency, Diversification of Suppliers and Renewable Hydrogen Production - The Pillars of European Energy Independence","authors":"D. Nikolova, Dimo Stoilov","doi":"10.1109/BulEF56479.2022.10020199","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10020199","url":null,"abstract":"The article presents analysis of the potential for increased household energy efficiency, diversification of suppliers and renewable hydrogen production, as potential drivers towards greater European energy independence. It is a companion piece to an article [1] that we presented at the 14th BulEF conference on the Russo-Ukrainian conflict and its implications for a deepening of European energy integration. In our upcoming work, we present the relevant statistical data and develop projections, regarding the likelihood of achieving energy independence only through these three strategic approaches. Our conclusion is that it is highly unlikely that gains in these areas alone would be sufficient to offset the loss of Russian energy imports by the year 2030, as pledged by the Commission on March 8, 2022.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123181081","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}
Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021181
D. Georgiev, G. Georgiev, Y. Rangelov
The paper presents a comparison study of electrical insulating materials produced by two different manufacturers. Materials were tested according to the standard IEC 60243–1. The compliance of the materials to the manufacturer's specifications was tested. Comparisons between the materials were made through statistical hypothesis testing. Conclusions have been drawn for the procedure described in the standard for interpreting the test results.
{"title":"High Voltage Tests of Polymeric Sheets According to IEC 60243–1 for Suitability for Insulation in High Voltage Power Electronic Device","authors":"D. Georgiev, G. Georgiev, Y. Rangelov","doi":"10.1109/BulEF56479.2022.10021181","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021181","url":null,"abstract":"The paper presents a comparison study of electrical insulating materials produced by two different manufacturers. Materials were tested according to the standard IEC 60243–1. The compliance of the materials to the manufacturer's specifications was tested. Comparisons between the materials were made through statistical hypothesis testing. Conclusions have been drawn for the procedure described in the standard for interpreting the test results.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122644476","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}
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