Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998203
A. Fomin, M. Fomina, A. Steinhauer, N. Petrova, E. Poshivalova, I. Rodionov
A construction of laboratory apparatus for heat treatment of titanium implants by high-frequency currents is described. Dependencies of heating of titanium implant samples at different power consumption were defined. Novel matrix coatings of titanium dioxide with colloidal hydroxyapatite (nanophase filler) were produced on the surface of medical items, which are made of commercially pure titanium VT1-00 and titanium alloy VT16 (Ti-2.5Al-5Mo-5V). Consistency changes of morphological characteristics, hardness and biological compatibility of titanium intraosseous implants with coatings produced by the above-mentioned technique using induction heating were defined. Technological recommendations for obtaining bioceramic coatings with extremely high strength on titanium items surface were given.
{"title":"Induction heat treatment device and technique of bioceramic coatings production on titanium implants","authors":"A. Fomin, M. Fomina, A. Steinhauer, N. Petrova, E. Poshivalova, I. Rodionov","doi":"10.1109/RTUCON.2014.6998203","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998203","url":null,"abstract":"A construction of laboratory apparatus for heat treatment of titanium implants by high-frequency currents is described. Dependencies of heating of titanium implant samples at different power consumption were defined. Novel matrix coatings of titanium dioxide with colloidal hydroxyapatite (nanophase filler) were produced on the surface of medical items, which are made of commercially pure titanium VT1-00 and titanium alloy VT16 (Ti-2.5Al-5Mo-5V). Consistency changes of morphological characteristics, hardness and biological compatibility of titanium intraosseous implants with coatings produced by the above-mentioned technique using induction heating were defined. Technological recommendations for obtaining bioceramic coatings with extremely high strength on titanium items surface were given.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"44 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":"115810322","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.2014.6998175
A. Sauhats, L. Petrichenko, S. Berjozkina, V. Neimane
The paper presents a comparison of two methodologies for selection of overhead line wire type and cross-section considering market conditions. All existing methodologies which are used to determine optimal cross-section for transmission line wires can be divided into two categories: deterministic and probabilistic (stochastic). This paper presents a new approach for stochastic optimization and compares it to simplified deterministic approach. The proposed method minimizes total annual exploitation and construction costs of the transmission line based on utilization of existing large and easy accessible databases (electricity prices, ambient temperature, load records). The use of the Monte Carlo method's base and above-mentioned databases allows designing a user-friendly algorithm to solve this problem.
{"title":"Probabilistic method for selection of power line wire type and cross-section","authors":"A. Sauhats, L. Petrichenko, S. Berjozkina, V. Neimane","doi":"10.1109/RTUCON.2014.6998175","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998175","url":null,"abstract":"The paper presents a comparison of two methodologies for selection of overhead line wire type and cross-section considering market conditions. All existing methodologies which are used to determine optimal cross-section for transmission line wires can be divided into two categories: deterministic and probabilistic (stochastic). This paper presents a new approach for stochastic optimization and compares it to simplified deterministic approach. The proposed method minimizes total annual exploitation and construction costs of the transmission line based on utilization of existing large and easy accessible databases (electricity prices, ambient temperature, load records). The use of the Monte Carlo method's base and above-mentioned databases allows designing a user-friendly algorithm to solve this problem.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 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":"121341163","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.2014.6998196
I. Oleinikova, A. Mutule, Mairis Putnins
This paper gives an insight in synchrophasor technologies and proposes an overall framework for estimating power transmission line parameters, by employing synchronous phasors in real time. Based on estimated line parameters, the average line temperature and the sag of selected spans can be calculated and utilized for dynamic thermal rating applications for increased power transfer.
{"title":"PMU measurements application for transmission line temperature and sag estimation algorithm development","authors":"I. Oleinikova, A. Mutule, Mairis Putnins","doi":"10.1109/RTUCON.2014.6998196","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998196","url":null,"abstract":"This paper gives an insight in synchrophasor technologies and proposes an overall framework for estimating power transmission line parameters, by employing synchronous phasors in real time. Based on estimated line parameters, the average line temperature and the sag of selected spans can be calculated and utilized for dynamic thermal rating applications for increased power transfer.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"95 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":"122309288","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.2014.6998190
V. Oboskalov, T. Panikovskaya
The paper presents an algorithm for electricity market participant to obtain optimal bid under price uncertainty. The model is based on the known probability density functions of forecast prices. The problem is to estimate the parameters of blocks - values of power and their corresponding prices. The objective function is an expected value of profit for selling energy. The stochastic market clearing prices only affects the objective function, and particularly, the term corresponding to revenues. The parameters of blocks are interconnected by probability function. To determine required values the recurrent optimization procedure is developed. The criterion of procedure interruption is the required number of stairs in bidding function.
{"title":"Bid strategy under price uncertainty","authors":"V. Oboskalov, T. Panikovskaya","doi":"10.1109/RTUCON.2014.6998190","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998190","url":null,"abstract":"The paper presents an algorithm for electricity market participant to obtain optimal bid under price uncertainty. The model is based on the known probability density functions of forecast prices. The problem is to estimate the parameters of blocks - values of power and their corresponding prices. The objective function is an expected value of profit for selling energy. The stochastic market clearing prices only affects the objective function, and particularly, the term corresponding to revenues. The parameters of blocks are interconnected by probability function. To determine required values the recurrent optimization procedure is developed. The criterion of procedure interruption is the required number of stairs in bidding function.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"17 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":"131901669","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.2014.6998205
Vitaly Yanpavlis, A. Suzdalenko, A. Stepanov, Laura Dzelzkaleja
The use of solar energy in Northern countries is not as obviously reasonable as in the countries that are located closer to the Equator due to bigger differences of daytime during changes of seasons, as well as lower solar irradiance. This paper investigates the advantages of using a heliostat with non-rotating solar energy receivers (like water/air heating collectors, stationary PV panels or solar illumination collectors). The optimal orientation of the solar receiver and the heliostat is discussed in detail for two different optimization strategies - maximal energy and maximal operation period with irradiance higher than 400 W/m2. The results of the analysis demonstrate that the heliostat allows prolonging the operation of solar receivers for 20 % of time during the year, or allows extracting 30 % more energy per annum if proper orientation angles are selected.
{"title":"Analysis of using a heliostat with non-rotating solar energy receivers","authors":"Vitaly Yanpavlis, A. Suzdalenko, A. Stepanov, Laura Dzelzkaleja","doi":"10.1109/RTUCON.2014.6998205","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998205","url":null,"abstract":"The use of solar energy in Northern countries is not as obviously reasonable as in the countries that are located closer to the Equator due to bigger differences of daytime during changes of seasons, as well as lower solar irradiance. This paper investigates the advantages of using a heliostat with non-rotating solar energy receivers (like water/air heating collectors, stationary PV panels or solar illumination collectors). The optimal orientation of the solar receiver and the heliostat is discussed in detail for two different optimization strategies - maximal energy and maximal operation period with irradiance higher than 400 W/m2. The results of the analysis demonstrate that the heliostat allows prolonging the operation of solar receivers for 20 % of time during the year, or allows extracting 30 % more energy per annum if proper orientation angles are selected.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"50 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":"116757947","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.2014.6998188
E. Vega-Fuentes, Sonia Leon-del Rosario, J. Cerezo-Sanchez, Aurelio Vega-Martinez
This paper introduces a combined comparison and regression method to quantify a credible estimation of the energy saving effect produced by Conservation Voltage Reduction (CVR). It is presented as a step by step tutorial on how to assess CVR effects with existing resources and tools at every control room in electrical distribution utilities. The method was tested in a distribution network in Canary Islands (Spain) resulting a CVR factor of 0.8211 and 9.42 MWh saved during one day operating with 2.97 % voltage reduction, equivalent to the consumption of 848 households in the region.
{"title":"Combined comparison-regression method for assessment of CVR effects","authors":"E. Vega-Fuentes, Sonia Leon-del Rosario, J. Cerezo-Sanchez, Aurelio Vega-Martinez","doi":"10.1109/RTUCON.2014.6998188","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998188","url":null,"abstract":"This paper introduces a combined comparison and regression method to quantify a credible estimation of the energy saving effect produced by Conservation Voltage Reduction (CVR). It is presented as a step by step tutorial on how to assess CVR effects with existing resources and tools at every control room in electrical distribution utilities. The method was tested in a distribution network in Canary Islands (Spain) resulting a CVR factor of 0.8211 and 9.42 MWh saved during one day operating with 2.97 % voltage reduction, equivalent to the consumption of 848 households in the region.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"18 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":"114610822","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.2014.6998210
A. Chub, Liisa Liivik, D. Vinnikov
Impedance-source switched mode converters are an emerging technology in electric energy conversion. They overcome limitations of conventional solutions by the utilization of specific impedance-source networks. Previous review papers cover impedance-source networks. Focus of this paper is on the topologies of the impedance-source galvanically isolated DC/DC converter. These converters are particularly appropriate for distributed generation systems with renewable or alternative energy sources which require input voltage regulation in a wide range. This paper presents a concise review of basic existing topologies for researchers and engineers. All the reviewed topologies of the impedance-source galvanically isolated DC/DC converter are classified by the element that transfers energy from the input to the output: a transformer or a coupled inductor. This classification undoubtedly reveals wide space for further research and the most promising research directions in this field.
{"title":"Impedance-source galvanically isolated DC/DC converters: State of the art and future challenges","authors":"A. Chub, Liisa Liivik, D. Vinnikov","doi":"10.1109/RTUCON.2014.6998210","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998210","url":null,"abstract":"Impedance-source switched mode converters are an emerging technology in electric energy conversion. They overcome limitations of conventional solutions by the utilization of specific impedance-source networks. Previous review papers cover impedance-source networks. Focus of this paper is on the topologies of the impedance-source galvanically isolated DC/DC converter. These converters are particularly appropriate for distributed generation systems with renewable or alternative energy sources which require input voltage regulation in a wide range. This paper presents a concise review of basic existing topologies for researchers and engineers. All the reviewed topologies of the impedance-source galvanically isolated DC/DC converter are classified by the element that transfers energy from the input to the output: a transformer or a coupled inductor. This classification undoubtedly reveals wide space for further research and the most promising research directions in this field.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 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":"130678558","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.2014.6998174
V. Skopis, I. Uteshevs
This paper continues the authors' former research. It is focused on modelling of an adapting device. The equations used for self-tuning or adaptive systems are adjusted to derive the mathematical model of an adaptronic system and the structural scheme of such system is built based on the scheme of self-tuning system. Adapter is described as open-loop automatic control system with two first-order aperiodic blocks and PI controller. As here the main attention is paid to the adapter and to simplify equations, blocks of the main loops are proportional (P) controllers. This is used to make a simulated computer model for adaptronic system.
{"title":"Modeling adapters in the adaptronic system for automatic control of industrial processes","authors":"V. Skopis, I. Uteshevs","doi":"10.1109/RTUCON.2014.6998174","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998174","url":null,"abstract":"This paper continues the authors' former research. It is focused on modelling of an adapting device. The equations used for self-tuning or adaptive systems are adjusted to derive the mathematical model of an adaptronic system and the structural scheme of such system is built based on the scheme of self-tuning system. Adapter is described as open-loop automatic control system with two first-order aperiodic blocks and PI controller. As here the main attention is paid to the adapter and to simplify equations, blocks of the main loops are proportional (P) controllers. This is used to make a simulated computer model for adaptronic system.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"11 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":"133532585","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.2014.6998185
S. Melentjev, A. Belahcen, A. Kallaste, T. Vaimann
This paper describes existing modern control methods of electric machine drives in general and tries to propose control methods for reluctance machines in particular. An overview analysis is carried out and features are brought out for each of the control methods and implementation possibilities for the control of reluctance machines is researched. Assumptions on the optimal control method for reluctance machine drives are made in the conclusion, which will be used as a basis for future work.
{"title":"Overview of control methods of reluctance machines with sensors and sensorless","authors":"S. Melentjev, A. Belahcen, A. Kallaste, T. Vaimann","doi":"10.1109/RTUCON.2014.6998185","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998185","url":null,"abstract":"This paper describes existing modern control methods of electric machine drives in general and tries to propose control methods for reluctance machines in particular. An overview analysis is carried out and features are brought out for each of the control methods and implementation possibilities for the control of reluctance machines is researched. Assumptions on the optimal control method for reluctance machine drives are made in the conclusion, which will be used as a basis for future work.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"81 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":"121184372","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.2014.6998173
Jordan Radosavljević, N. Arsic, M. Jevtic
This paper presents a new hybrid algorithm based on the particle swarm optimization (PSO) and the gravitational search algorithm (GSA) for solving the optimal power flow (OPF) in power systems. Performance of this approach for the OPF problem is studied and evaluated on the standard IEEE 30-bus test system with different objective functions. Simulation results on the OPF problem show that the hybrid PSOGSA algorithm provides effective and robust high-quality solution.
{"title":"Optimal power flow using hybrid PSOGSA algorithm","authors":"Jordan Radosavljević, N. Arsic, M. Jevtic","doi":"10.1109/RTUCON.2014.6998173","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998173","url":null,"abstract":"This paper presents a new hybrid algorithm based on the particle swarm optimization (PSO) and the gravitational search algorithm (GSA) for solving the optimal power flow (OPF) in power systems. Performance of this approach for the OPF problem is studied and evaluated on the standard IEEE 30-bus test system with different objective functions. Simulation results on the OPF problem show that the hybrid PSOGSA algorithm provides effective and robust high-quality solution.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"13 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":"124443645","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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