Pub Date : 2018-09-01DOI: 10.1109/BULEF.2018.8646949
V. Dimitrov
In this paper, an approach for asynchronous drive testing at different frequency converter parameter settings has been developed. Tests at different settings of the pulse-width modulation frequency were carried out using a specialized laboratory simulator to record the transient processes and the values of the controlled parameters in the steady-state operation. The results obtained have been analyzed to determine the impact of the examined parameter on the drive efficiency and dynamic performance. The experimental verification of the proposed approach proves its applicability in the setting of the frequency converters for drives in various fields of industry and transport.
{"title":"Approach for setting of pulse frequency to achieve optimal asynchronous drive performance","authors":"V. Dimitrov","doi":"10.1109/BULEF.2018.8646949","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646949","url":null,"abstract":"In this paper, an approach for asynchronous drive testing at different frequency converter parameter settings has been developed. Tests at different settings of the pulse-width modulation frequency were carried out using a specialized laboratory simulator to record the transient processes and the values of the controlled parameters in the steady-state operation. The results obtained have been analyzed to determine the impact of the examined parameter on the drive efficiency and dynamic performance. The experimental verification of the proposed approach proves its applicability in the setting of the frequency converters for drives in various fields of industry and transport.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125274265","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 : 2018-09-01DOI: 10.1109/bulef.2018.8646952
V. Dimitrov, Gulek Nedjib
In this paper, the contemporary devices for the construction of a SCADA system for remote control of power lines from the distribution network in the region of Sofia are presented and analyzed: indicators of fault currents (signaling devices), reclosers, outdoor load disconnectors, local control systems, etc. The implemented functions are described. Opportunities of monitoring and management by the Dispatcher Control Center are discussed.
{"title":"Peculiarities in construction of SCADA system for monitoring of electrical power supply networks","authors":"V. Dimitrov, Gulek Nedjib","doi":"10.1109/bulef.2018.8646952","DOIUrl":"https://doi.org/10.1109/bulef.2018.8646952","url":null,"abstract":"In this paper, the contemporary devices for the construction of a SCADA system for remote control of power lines from the distribution network in the region of Sofia are presented and analyzed: indicators of fault currents (signaling devices), reclosers, outdoor load disconnectors, local control systems, etc. The implemented functions are described. Opportunities of monitoring and management by the Dispatcher Control Center are discussed.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131010863","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 : 2018-09-01DOI: 10.1109/bulef.2018.8646926
V. Dimitrov
In this paper, an approach for asynchronous drive testing at different control modes U = f(f) has been developed. Many tests have been carried out using a specialized laboratory simulator and the results obtained have been analyzed. The experimental verification of the approach proves its applicability in the choice of suitable frequency converter for drives in various fields of industry and transport: pre-invested funds can be restored by implementing optimal control mode and increased energy efficiency.
{"title":"Approach for choice of the asynchronous drive control mode to achieve optimal performance","authors":"V. Dimitrov","doi":"10.1109/bulef.2018.8646926","DOIUrl":"https://doi.org/10.1109/bulef.2018.8646926","url":null,"abstract":"In this paper, an approach for asynchronous drive testing at different control modes U = f(f) has been developed. Many tests have been carried out using a specialized laboratory simulator and the results obtained have been analyzed. The experimental verification of the approach proves its applicability in the choice of suitable frequency converter for drives in various fields of industry and transport: pre-invested funds can be restored by implementing optimal control mode and increased energy efficiency.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122546848","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646920
I. Balabozov
The work presents the development of a microcontroller system prototype based on the platform “Arduino Uno”. The prototype has been used to perform experimental tests to determine the Joule integral of a fuse. The prototype relies on an indirect method of obtaining the results for the Joule integral.
{"title":"Prototype of a Microcontroller System for Defining Joule Integral of Fuse","authors":"I. Balabozov","doi":"10.1109/BULEF.2018.8646920","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646920","url":null,"abstract":"The work presents the development of a microcontroller system prototype based on the platform “Arduino Uno”. The prototype has been used to perform experimental tests to determine the Joule integral of a fuse. The prototype relies on an indirect method of obtaining the results for the Joule integral.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126352337","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646958
G. Todorov
An investigation of copper and iron losses distribution in internal permanent magnet synchronous motor is presented. Two rotor configuration have been analyzed – with integral permanent magnet per pole and with a segmented magnet with one ferromagnetic rib in the pole middle. Maximum torque per ampere (MTPA) and iron loss minimization (ILM) control have been applied for both constructions. The influence of the rotor configuration and the control strategy on the loss distribution is shown.
{"title":"Loss distribution in IPMSM at different control strategy","authors":"G. Todorov","doi":"10.1109/BULEF.2018.8646958","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646958","url":null,"abstract":"An investigation of copper and iron losses distribution in internal permanent magnet synchronous motor is presented. Two rotor configuration have been analyzed – with integral permanent magnet per pole and with a segmented magnet with one ferromagnetic rib in the pole middle. Maximum torque per ampere (MTPA) and iron loss minimization (ILM) control have been applied for both constructions. The influence of the rotor configuration and the control strategy on the loss distribution is shown.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124684519","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646929
Valentin Kolev, Angel Georgiev, S. Sulakov
The reliability of the power system is divided into - adequacy and security. System adequacy relates to the existence of sufficient generators within the system to satisfy the consumer load demand or system operational constraints. This report presents a way of probabilistic modeling of available capacity in the generation subsystem. Under considerations are conventional generating units, cogenerations and different types of renewable energy sources.
{"title":"Probabilistic modelling of available capacity in the power system","authors":"Valentin Kolev, Angel Georgiev, S. Sulakov","doi":"10.1109/BULEF.2018.8646929","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646929","url":null,"abstract":"The reliability of the power system is divided into - adequacy and security. System adequacy relates to the existence of sufficient generators within the system to satisfy the consumer load demand or system operational constraints. This report presents a way of probabilistic modeling of available capacity in the generation subsystem. Under considerations are conventional generating units, cogenerations and different types of renewable energy sources.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125711495","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 : 2018-09-01DOI: 10.1109/bulef.2018.8646922
Daniel Dobrilov, Velichko Atanasov, P. Danchev
The paper examines an innovative approach to limit switching overvoltage’s from shunt reactors MV, which are installed in nodal distribution stations. This is done by changing the magnitude and nature of the switched current. The necessary electrical and technological protections, as well as their settings, are considered.
{"title":"Features in compensating reactive capacitive energy in medium voltage networks","authors":"Daniel Dobrilov, Velichko Atanasov, P. Danchev","doi":"10.1109/bulef.2018.8646922","DOIUrl":"https://doi.org/10.1109/bulef.2018.8646922","url":null,"abstract":"The paper examines an innovative approach to limit switching overvoltage’s from shunt reactors MV, which are installed in nodal distribution stations. This is done by changing the magnitude and nature of the switched current. The necessary electrical and technological protections, as well as their settings, are considered.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132699465","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646925
I. Ivanov, Teodosi Tsankov
More and more using of the natural gas for energy, industrial and household purposes on one hand and the risk of accidents and risk for the safety and the human health during the operation of gas installations, using of gas pressured bottles and appliances, on other hand are the motivation for a survey and presentation of some outcomes in this paper. There are shown general review of the accidents, the main reasons for them, in particular related with electrical origin, descriptions of consequences for the safety and human health’ risk, and some lessons learned from the survey, in national level for Bulgaria after 2000.
{"title":"State Of The Art Safety And Human Health Risk Analysis Of Accidents With Gas Installations And Appliances, In Particular Related With Electrical Origin, In Buildings At Bulgaria","authors":"I. Ivanov, Teodosi Tsankov","doi":"10.1109/BULEF.2018.8646925","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646925","url":null,"abstract":"More and more using of the natural gas for energy, industrial and household purposes on one hand and the risk of accidents and risk for the safety and the human health during the operation of gas installations, using of gas pressured bottles and appliances, on other hand are the motivation for a survey and presentation of some outcomes in this paper. There are shown general review of the accidents, the main reasons for them, in particular related with electrical origin, descriptions of consequences for the safety and human health’ risk, and some lessons learned from the survey, in national level for Bulgaria after 2000.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128292526","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 : 2018-09-01DOI: 10.1109/BULEF.2018.8646930
I. Balabozov
In the present work a system using a microcontroller electronic platform in the realization of an experimental determination of a Joule integral of a fuse is presented. An algorithm is proposed based on which software has been developed and a working prototype of a microcontroller system is established.
{"title":"Experimental Research with Microcontroller System for Defining of Joule Integral of Fuse","authors":"I. Balabozov","doi":"10.1109/BULEF.2018.8646930","DOIUrl":"https://doi.org/10.1109/BULEF.2018.8646930","url":null,"abstract":"In the present work a system using a microcontroller electronic platform in the realization of an experimental determination of a Joule integral of a fuse is presented. An algorithm is proposed based on which software has been developed and a working prototype of a microcontroller system is established.","PeriodicalId":416020,"journal":{"name":"2018 10th Electrical Engineering Faculty Conference (BulEF)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128327313","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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