Pub Date : 2022-09-14DOI: 10.1109/BulEF56479.2022.10021184
Kalinka Todorova, D. Pavlov, V. Petrov
Color temperature is one of the most important factors when designing artificial lighting. This parameter is especially important to properly solve the visual task, as well as for the health and comfort of the artificial lighting users. More and more manufacturers take this fact into consideration and numerus luminaires have appeared on the market with the possibility of changing the color temperature depending on the visual task and application of the lighting system. The management and control of adjustable CCT lighting with intelligent systems allows for greater flexibility, multifunctionality and economy. The publication describes a method for calibrating a low-cost sensor used for CCT control and measurement.
{"title":"Uncertainty Budget for Calibration of Sensors for Measurement of Correlated Color Temperature","authors":"Kalinka Todorova, D. Pavlov, V. Petrov","doi":"10.1109/BulEF56479.2022.10021184","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021184","url":null,"abstract":"Color temperature is one of the most important factors when designing artificial lighting. This parameter is especially important to properly solve the visual task, as well as for the health and comfort of the artificial lighting users. More and more manufacturers take this fact into consideration and numerus luminaires have appeared on the market with the possibility of changing the color temperature depending on the visual task and application of the lighting system. The management and control of adjustable CCT lighting with intelligent systems allows for greater flexibility, multifunctionality and economy. The publication describes a method for calibrating a low-cost sensor used for CCT control and measurement.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"280 1-2 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":"131713343","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/BulEF56479.2022.10021197
Nikolay Matanov, Plamen Nankinsky
As reported on a worldwide, there is a tendency to develop and implement smart substations, which basically change every single aspect of the well-known technological processes of production, transmission and distribution of electrical energy. Usually, the implementation of an intelligent substation is achieved by implementing intelligent primary high-voltage equipment and complex secondary devices subordinated to a hierarchical structure. Functional connections, information exchange and interoperability among the multitude of implemented intelligent modules is provided based on the IEC 61850 communication protocol. This report examines the main elements of each digital substation (DS), the international standards that relate to the construction and operation of the DS, and the types of structures related to the information flows in the DS.
{"title":"Digital substations - the backbone of smart grids","authors":"Nikolay Matanov, Plamen Nankinsky","doi":"10.1109/BulEF56479.2022.10021197","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021197","url":null,"abstract":"As reported on a worldwide, there is a tendency to develop and implement smart substations, which basically change every single aspect of the well-known technological processes of production, transmission and distribution of electrical energy. Usually, the implementation of an intelligent substation is achieved by implementing intelligent primary high-voltage equipment and complex secondary devices subordinated to a hierarchical structure. Functional connections, information exchange and interoperability among the multitude of implemented intelligent modules is provided based on the IEC 61850 communication protocol. This report examines the main elements of each digital substation (DS), the international standards that relate to the construction and operation of the DS, and the types of structures related to the information flows in the DS.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"51 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":"132605017","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/BulEF56479.2022.10021155
M. Trifonov, Valentin Kolev, Iva Draganova-Zlateva
Summary - This paper contains a basic overview of the electricity price regulation methods applied in the Republic of Bulgaria. Goals and tasks that these methods should implement in order to protect the public interest, including affordability of prices for end customers, sufficient financial security of energy companies and a high security degree of the electric power system.
{"title":"Analysis of the methods for price regulation of network tariffs and the price of balancing energy in the Republic of Bulgaria","authors":"M. Trifonov, Valentin Kolev, Iva Draganova-Zlateva","doi":"10.1109/BulEF56479.2022.10021155","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021155","url":null,"abstract":"Summary - This paper contains a basic overview of the electricity price regulation methods applied in the Republic of Bulgaria. Goals and tasks that these methods should implement in order to protect the public interest, including affordability of prices for end customers, sufficient financial security of energy companies and a high security degree of the electric power system.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"638 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":"116085274","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/BulEF56479.2022.10021164
G. Georgiev, D. Georgiev, Y. Rangelov
The paper presents a study of the effects of in-service aging of composite silicone insulators, which are increasingly used in the overhead power lines of Bulgaria. The insulators were tested with power frequency high voltage according to the relevant standards. The obtained results are compared with test results for new insulators.
{"title":"High-Voltage Test of Silicone Composite Insulators, Comparison Between New Ones and Aged in Service","authors":"G. Georgiev, D. Georgiev, Y. Rangelov","doi":"10.1109/BulEF56479.2022.10021164","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021164","url":null,"abstract":"The paper presents a study of the effects of in-service aging of composite silicone insulators, which are increasingly used in the overhead power lines of Bulgaria. The insulators were tested with power frequency high voltage according to the relevant standards. The obtained results are compared with test results for new insulators.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"11 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":"128466830","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/BulEF56479.2022.10021191
R. Stanev, Pavlin Dzhumaliyski, Nikola Stoychev, Kostadin Viglov, N. Nikolov, Nikolay Polihronov
This publication presents a research on the Voltage Control Strategies for Distribution networks with Distributed Energy Resources (DER). Taking into account the network topology and the load and generation profiles some typical states are calculated using the STATUS power system analysis software. Furthermore, a quasi-dynamic analysis and test case with distributed photovoltaic generators (PVG) in a distribution network is performed in order to demonstrate the interaction of different converter interfaced DER and other network controlled elements such as under load tap changers. Based on the results obtained valuable conclusions and recommendations are made.
{"title":"Voltage Control Strategies for Distribution Networks with Distributed Energy Resources","authors":"R. Stanev, Pavlin Dzhumaliyski, Nikola Stoychev, Kostadin Viglov, N. Nikolov, Nikolay Polihronov","doi":"10.1109/BulEF56479.2022.10021191","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021191","url":null,"abstract":"This publication presents a research on the Voltage Control Strategies for Distribution networks with Distributed Energy Resources (DER). Taking into account the network topology and the load and generation profiles some typical states are calculated using the STATUS power system analysis software. Furthermore, a quasi-dynamic analysis and test case with distributed photovoltaic generators (PVG) in a distribution network is performed in order to demonstrate the interaction of different converter interfaced DER and other network controlled elements such as under load tap changers. Based on the results obtained valuable conclusions and recommendations are made.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"38 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":"125851412","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/BulEF56479.2022.10021205
E. Dimitrova, Svetoslav Tomov
The passenger's safety is always at first. Nowadays metro transport requires prevention of passengers' access to the railway track. On one side this is for safety reasons and on the other - it is to guarantee a smooth and comfortable transport service. Passengers' safety on the platform is ensured via implementation of barrier (screen) systems. The report analyzes station barrier systems for passengers currently installed in Sofia Metropolitan. The aim is to provide structure details and the work principles of the various solutions, their advantages and disadvantages and the impact that they have on the operation. The Metropolitan of Sofia uses two kinds of passengers' barriers: Rope-type Screen Doors and Sliding Platform Screen Doors of half height. Both are tailored as per the relevant rolling stocks types and line signaling system for achieving an optimal balance between the safety objectives based on the corresponding capabilities of the line. The report addresses the safety level provided by passengers' barriers and their impact onto the timetable, meaning the time in addition to the train dwell time needed for the barrier system operation, (time for) reaction in case of obstacle, (time for) reaction in case corrective maintenance during operation. Passenger behaviors due to the different barrier structures, indications in case of problems, proposals for improvements are also analyzed.
{"title":"Research of Station Passenger Security Systems in Rail Transport","authors":"E. Dimitrova, Svetoslav Tomov","doi":"10.1109/BulEF56479.2022.10021205","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021205","url":null,"abstract":"The passenger's safety is always at first. Nowadays metro transport requires prevention of passengers' access to the railway track. On one side this is for safety reasons and on the other - it is to guarantee a smooth and comfortable transport service. Passengers' safety on the platform is ensured via implementation of barrier (screen) systems. The report analyzes station barrier systems for passengers currently installed in Sofia Metropolitan. The aim is to provide structure details and the work principles of the various solutions, their advantages and disadvantages and the impact that they have on the operation. The Metropolitan of Sofia uses two kinds of passengers' barriers: Rope-type Screen Doors and Sliding Platform Screen Doors of half height. Both are tailored as per the relevant rolling stocks types and line signaling system for achieving an optimal balance between the safety objectives based on the corresponding capabilities of the line. The report addresses the safety level provided by passengers' barriers and their impact onto the timetable, meaning the time in addition to the train dwell time needed for the barrier system operation, (time for) reaction in case of obstacle, (time for) reaction in case corrective maintenance during operation. Passenger behaviors due to the different barrier structures, indications in case of problems, proposals for improvements are also analyzed.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"42 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":"114276953","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/BulEF56479.2022.10021201
V. Gyurov, G. Ivanova, Milen Duganov, S. Rachev
The hybrid SAVe CUBE devices are one of the most prospective topologies in marine power systems. The use of the AC-DC-AC architecture concept is related to limiting the spread of higher voltage and current harmonics in the ship's power supply system caused by the powerful electronic converters. This is associated with an increased number of elements, which also changes the overall reliability indicators. The report presents a comparative analysis of reliability indicators in conventional and hybrid marine power systems. The results can be used as quantitative criteria for evaluating the probability of failures, the overall reliability of the system, defining the repair cycle periods, which will facilitate the operational maintenance of ships electrical power systems.
{"title":"Comparative Analysis of Reliability Indicators in Conventional and Hybrid SAVe cube Ship Electrical Power Systems","authors":"V. Gyurov, G. Ivanova, Milen Duganov, S. Rachev","doi":"10.1109/BulEF56479.2022.10021201","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021201","url":null,"abstract":"The hybrid SAVe CUBE devices are one of the most prospective topologies in marine power systems. The use of the AC-DC-AC architecture concept is related to limiting the spread of higher voltage and current harmonics in the ship's power supply system caused by the powerful electronic converters. This is associated with an increased number of elements, which also changes the overall reliability indicators. The report presents a comparative analysis of reliability indicators in conventional and hybrid marine power systems. The results can be used as quantitative criteria for evaluating the probability of failures, the overall reliability of the system, defining the repair cycle periods, which will facilitate the operational maintenance of ships electrical power systems.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"17 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":"127041705","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/BulEF56479.2022.10021194
A. Filipov, M. Mehmed-Hamza, M. Ivanova
In modern power grids, one of the main issues in their operation is related to their reliability and provision of quality power supply to consumers. The requirements for the security, the operating regimes of the power distribution grids, the quality of electricity and the quality of the entire service of power supply are regulated by law. Regardless of the preventive measures, faults and accidents occur during the period of operation of the power distribution grids. For the purpose of analysis and control, the causes for accidents and the single outage duration and average durations of power outages are taken into account. The main factors determining the duration of the power outages are the type of fault, the facility type and the time for detecting the fault location. This publication focuses on some factors determining the detection time of the fault location on overhead power lines using optimization one-dimensional methods.
{"title":"Application of one-dimensional methods for optimization for detecting the fault location in power distribution grids","authors":"A. Filipov, M. Mehmed-Hamza, M. Ivanova","doi":"10.1109/BulEF56479.2022.10021194","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021194","url":null,"abstract":"In modern power grids, one of the main issues in their operation is related to their reliability and provision of quality power supply to consumers. The requirements for the security, the operating regimes of the power distribution grids, the quality of electricity and the quality of the entire service of power supply are regulated by law. Regardless of the preventive measures, faults and accidents occur during the period of operation of the power distribution grids. For the purpose of analysis and control, the causes for accidents and the single outage duration and average durations of power outages are taken into account. The main factors determining the duration of the power outages are the type of fault, the facility type and the time for detecting the fault location. This publication focuses on some factors determining the detection time of the fault location on overhead power lines using optimization one-dimensional methods.","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":"128243342","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/BulEF56479.2022.10020206
S. Tzvetkova, Angel Petleshkov, Yavor Lozanov
The report presents the results of research, analysis and assessment of the quality of electric energy in the power supply system of a company for the production of electronic control systems embedded in autonomous electric vehicles.
{"title":"Quality of electric energy in a facility for production of electronic control systems","authors":"S. Tzvetkova, Angel Petleshkov, Yavor Lozanov","doi":"10.1109/BulEF56479.2022.10020206","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10020206","url":null,"abstract":"The report presents the results of research, analysis and assessment of the quality of electric energy in the power supply system of a company for the production of electronic control systems embedded in autonomous electric vehicles.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"22 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":"125727998","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/BulEF56479.2022.10021178
R. Spasov, Emil Rachev, V. Petrov, V. Milenov
The paper deals with estimation procedure of the induction motor parameters using the manufacturer's technical data. The results are verified by simulations. Various motor tests are modelled in the verification process: dc-voltage test for stator resistance identification, no-load test, short-circuit test and under-load test simulation of the induction motor model. The model is based on the equivalent circuit of the motor, and its parameters are calculated using the methodology proposed in the paper.
{"title":"Determining the Equivalent Circuit Parameters of Three-Phase Induction Motor From the Manufacturer's Technical Data","authors":"R. Spasov, Emil Rachev, V. Petrov, V. Milenov","doi":"10.1109/BulEF56479.2022.10021178","DOIUrl":"https://doi.org/10.1109/BulEF56479.2022.10021178","url":null,"abstract":"The paper deals with estimation procedure of the induction motor parameters using the manufacturer's technical data. The results are verified by simulations. Various motor tests are modelled in the verification process: dc-voltage test for stator resistance identification, no-load test, short-circuit test and under-load test simulation of the induction motor model. The model is based on the equivalent circuit of the motor, and its parameters are calculated using the methodology proposed in the paper.","PeriodicalId":375606,"journal":{"name":"2022 14th Electrical Engineering Faculty Conference (BulEF)","volume":"43 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":"133159321","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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