Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998184
A. Sauhats, Gregory Pashnin, Jevgeņijs Kucajevs, Dmitrijs Soboļevskis
The paper is dedicated to the power plants feasibility study, which can be considered as a first step of a long way design, construction and commissioning of power plant. This task is hundred years old, but with the market tools implementation on power systems operation and planning the feasibility study conditions change substantially. The criteria for maximizing the profit of stakeholders of power plant should be reformulated. The criteria may contain the uncertain and random variables. The task assumes stochastic programming form. The needs for additional large amount of information appear. As a result, the task becomes much more complicated which necessitates the creation of new algorithms and software tools for its solution. The paper is devoted to a description and justification of the developed software product and its application to real plant feasibility study.
{"title":"Power plants feasibility studies supported by stochastic programming software","authors":"A. Sauhats, Gregory Pashnin, Jevgeņijs Kucajevs, Dmitrijs Soboļevskis","doi":"10.1109/RTUCON.2014.6998184","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998184","url":null,"abstract":"The paper is dedicated to the power plants feasibility study, which can be considered as a first step of a long way design, construction and commissioning of power plant. This task is hundred years old, but with the market tools implementation on power systems operation and planning the feasibility study conditions change substantially. The criteria for maximizing the profit of stakeholders of power plant should be reformulated. The criteria may contain the uncertain and random variables. The task assumes stochastic programming form. The needs for additional large amount of information appear. As a result, the task becomes much more complicated which necessitates the creation of new algorithms and software tools for its solution. The paper is devoted to a description and justification of the developed software product and its application to real plant feasibility study.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132291679","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 : 2014-12-29DOI: 10.1109/RTUCON.2014.6998191
G. Zaļeskis, Maksims Gavrilovs, I. Rankis
In this paper the factors influencing the self-excitation process in the synchronous generator and a method of this process improvement are described. In the case of high stator windings inductance commutation process in the rectifier at the generator output interfere with successful self-excitation, which is confirmed by analytical calculations and practical experiment. Use of the excitation current pulse regulator with the input capacitor allows not only to control current according to the generator rotation speed and load, but also to provide initial magnetization of the excitation winding, that in turn compensates influence of the commutation processes. The generator self-excitation at low speed is provided selecting the initial voltage level of the regulator input capacitor.
{"title":"Improvement of self-excitation process in synchronous generator","authors":"G. Zaļeskis, Maksims Gavrilovs, I. Rankis","doi":"10.1109/RTUCON.2014.6998191","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998191","url":null,"abstract":"In this paper the factors influencing the self-excitation process in the synchronous generator and a method of this process improvement are described. In the case of high stator windings inductance commutation process in the rectifier at the generator output interfere with successful self-excitation, which is confirmed by analytical calculations and practical experiment. Use of the excitation current pulse regulator with the input capacitor allows not only to control current according to the generator rotation speed and load, but also to provide initial magnetization of the excitation winding, that in turn compensates influence of the commutation processes. The generator self-excitation at low speed is provided selecting the initial voltage level of the regulator input capacitor.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116676695","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 : 2014-12-29DOI: 10.1109/RTUCON.2014.6998206
Khiem Nguyen-Duy, A. Knott, M. Andersen
Renewable energy sources are playing an important role in industry as green sources of energy to reduce carbon dioxide emissions. They possess electrically nonlinear voltage-current characteristics. In the test and development of the downstream converters that utilize these renewable types of energy, the practice of using nonlinear source emulators instead of the real nonlinear sources has gained a lot of interest. Different methods of implementing nonlinear source emulators have been reported in the literature, but no paper exists reviewing and assessing them from different technical points of view. This paper provides a review of the implementation of existing nonlinear source emulators. Their configurations are redrawn as block diagrams and their circuit operations are discussed. Different industrial emulators are also briefly reviewed concerning their features.
{"title":"A review on the implementation of nonlinear source emulators","authors":"Khiem Nguyen-Duy, A. Knott, M. Andersen","doi":"10.1109/RTUCON.2014.6998206","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998206","url":null,"abstract":"Renewable energy sources are playing an important role in industry as green sources of energy to reduce carbon dioxide emissions. They possess electrically nonlinear voltage-current characteristics. In the test and development of the downstream converters that utilize these renewable types of energy, the practice of using nonlinear source emulators instead of the real nonlinear sources has gained a lot of interest. Different methods of implementing nonlinear source emulators have been reported in the literature, but no paper exists reviewing and assessing them from different technical points of view. This paper provides a review of the implementation of existing nonlinear source emulators. Their configurations are redrawn as block diagrams and their circuit operations are discussed. Different industrial emulators are also briefly reviewed concerning their features.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117034070","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 : 2014-12-24DOI: 10.1109/RTUCON.2014.6998194
T. Orosz, Á. Sleisz, I. Vajda
The optimization of power transformers is one of the earliest applications of geometric programming. This approach works well with shell-form transformers, and the constructed models can be solved accurately with the new interior point method based solvers. However, a less well-known fact is that this kind of modeling becomes problematic in the case of core-form transformers. This paper shows a new metaheuristic solution to circumvent the main obstacle which is the calculation of short-circuit impedance.
{"title":"Core-form transformer design optimization with branch and bound search and geometric programming","authors":"T. Orosz, Á. Sleisz, I. Vajda","doi":"10.1109/RTUCON.2014.6998194","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998194","url":null,"abstract":"The optimization of power transformers is one of the earliest applications of geometric programming. This approach works well with shell-form transformers, and the constructed models can be solved accurately with the new interior point method based solvers. However, a less well-known fact is that this kind of modeling becomes problematic in the case of core-form transformers. This paper shows a new metaheuristic solution to circumvent the main obstacle which is the calculation of short-circuit impedance.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122759075","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 : 2014-10-01DOI: 10.1109/RTUCON.2014.6998212
Willian Rafael Fernandes, Z. A. Tamus, T. Orosz
This research shows an overview of geothermal power generation and common methods used to harness it. In this way, the semiconducting method with thermoelectric devices is proposed to generate electricity by the use of waste heat of spas. Nowadays thermoelectric power generation is not so common due to its implementing costs. On the other hand, many places have no conditions to generate geothermal power by using the common methods because of the low water temperature. Thus, semiconducting method can be another choice for these places. This research also shows economic availability for thermoelectric power generation.
{"title":"Characterization of peltier cell for the use of waste heat of spas","authors":"Willian Rafael Fernandes, Z. A. Tamus, T. Orosz","doi":"10.1109/RTUCON.2014.6998212","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998212","url":null,"abstract":"This research shows an overview of geothermal power generation and common methods used to harness it. In this way, the semiconducting method with thermoelectric devices is proposed to generate electricity by the use of waste heat of spas. Nowadays thermoelectric power generation is not so common due to its implementing costs. On the other hand, many places have no conditions to generate geothermal power by using the common methods because of the low water temperature. Thus, semiconducting method can be another choice for these places. This research also shows economic availability for thermoelectric power generation.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117290832","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 : 2014-10-01DOI: 10.1109/RTUCON.2014.6998216
A. Potapovs, A. Levchenkov, M. Gorobetz
This paper provides a new insight into the smooth and precise adaptive railway transport braking system development. The system contains a controller with a control program based on an adaptive control algorithm and a current train braking control system ensures an automatic smooth and precise braking of a train and another controller ensures an automatic stopping of the train before the red light. Some of the adaptive search algorithms are studied and the task is to test and select the most suitable and the most effective of them. The computer model and simulation results are described in this paper.
{"title":"Assessment of adaptive algorithms for automatic control of train braking system","authors":"A. Potapovs, A. Levchenkov, M. Gorobetz","doi":"10.1109/RTUCON.2014.6998216","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998216","url":null,"abstract":"This paper provides a new insight into the smooth and precise adaptive railway transport braking system development. The system contains a controller with a control program based on an adaptive control algorithm and a current train braking control system ensures an automatic smooth and precise braking of a train and another controller ensures an automatic stopping of the train before the red light. Some of the adaptive search algorithms are studied and the task is to test and select the most suitable and the most effective of them. The computer model and simulation results are described in this paper.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133094531","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 : 2014-10-01DOI: 10.1109/RTUCON.2014.6998183
J. Survilo
To determine the payments for delivered electricity and the power losses arising from the supply of electricity, the amount of electricity delivered from a power station to a certain consumer (reciprocal power) should be known. This to be realized requires tracing the flow of electricity. The superposition principle can be applied. The network is represented by generator nodes and consumer nodes connected by transmission line or by network branches. Generator nodes are fed by generator currents, consumer admittances determined at normal power flow mode are connected to consumer nodes. This circuit is energized by all generators in turn sending to their nodes currents equal to those in normal operation mode. Reciprocal current of a specific consumer node and a given generator is determined out of voltage across this consumer and its admittance. Reciprocal power loss then is determined by method of reciprocal current increments.
{"title":"Determination of reciprocal current by electricity delivery to more than one consumer","authors":"J. Survilo","doi":"10.1109/RTUCON.2014.6998183","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998183","url":null,"abstract":"To determine the payments for delivered electricity and the power losses arising from the supply of electricity, the amount of electricity delivered from a power station to a certain consumer (reciprocal power) should be known. This to be realized requires tracing the flow of electricity. The superposition principle can be applied. The network is represented by generator nodes and consumer nodes connected by transmission line or by network branches. Generator nodes are fed by generator currents, consumer admittances determined at normal power flow mode are connected to consumer nodes. This circuit is energized by all generators in turn sending to their nodes currents equal to those in normal operation mode. Reciprocal current of a specific consumer node and a given generator is determined out of voltage across this consumer and its admittance. Reciprocal power loss then is determined by method of reciprocal current increments.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127936268","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 : 2014-10-01DOI: 10.1109/RTUCON.2014.6998219
A. Avotiņš, P. Apse-Apsitis, M. Kuņickis, L. Ribickis
The article gives an overview of various researches dealing with smart or intelligent street lighting systems, and what is meant with this term in different countries. Several available architectures of smart street lighting systems as well as those for future are described and discussed. Further some researches and developments of such systems in Riga Technical University are explained with the examples, also showing preliminary practical energy saving results of tests in real conditions of Riga city infrastructure. This is the first part of articles series about this research.
{"title":"Towards smart street LED lighting systems and preliminary energy saving results","authors":"A. Avotiņš, P. Apse-Apsitis, M. Kuņickis, L. Ribickis","doi":"10.1109/RTUCON.2014.6998219","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998219","url":null,"abstract":"The article gives an overview of various researches dealing with smart or intelligent street lighting systems, and what is meant with this term in different countries. Several available architectures of smart street lighting systems as well as those for future are described and discussed. Further some researches and developments of such systems in Riga Technical University are explained with the examples, also showing preliminary practical energy saving results of tests in real conditions of Riga city infrastructure. This is the first part of articles series about this research.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453226","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 : 2014-10-01DOI: 10.1109/RTUCON.2014.6998208
Y. Chaiko, Muratbek Dzhamanshalov
Co-existence between mobile and digital broadcast television, generally focus on one system that has to be protected, providing the operational constraints for the other system, which is considered as interferer. In article an analysis of the coexistence of primary services is presented, focusing on the study of mutual interference between DVB T broadcasting and 3GPP Long Term Evolution (LTE) mobile systems.
{"title":"Coexistence between mobile and digital television systems","authors":"Y. Chaiko, Muratbek Dzhamanshalov","doi":"10.1109/RTUCON.2014.6998208","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998208","url":null,"abstract":"Co-existence between mobile and digital broadcast television, generally focus on one system that has to be protected, providing the operational constraints for the other system, which is considered as interferer. In article an analysis of the coexistence of primary services is presented, focusing on the study of mutual interference between DVB T broadcasting and 3GPP Long Term Evolution (LTE) mobile systems.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127089049","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 : 2014-10-01DOI: 10.1109/RTUCON.2014.6998217
Roman Olekshii, N. Kukļa, O. Linkevičs
This paper analyses the possibility of using the low-potential heat from a surface of power transformers. The authors discuss the production of electricity by means of thermoelectric modules. The feasibility of usage of thermoelectric modules was analyzed by carrying out theoretical calculations and a series of experimental test, which gave a clear view of capability of an application of thermoelectric modules for recovering of low-potential heat of power transformers.
{"title":"Feasibility of usage of thermoelectric modules for recovering of low-potential heat from a surface of power transformers","authors":"Roman Olekshii, N. Kukļa, O. Linkevičs","doi":"10.1109/RTUCON.2014.6998217","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998217","url":null,"abstract":"This paper analyses the possibility of using the low-potential heat from a surface of power transformers. The authors discuss the production of electricity by means of thermoelectric modules. The feasibility of usage of thermoelectric modules was analyzed by carrying out theoretical calculations and a series of experimental test, which gave a clear view of capability of an application of thermoelectric modules for recovering of low-potential heat of power transformers.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"515 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124259791","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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