Pub Date : 2016-10-01DOI: 10.1109/RTUCON.2016.7763098
D. Bliznyuk, A. Berdin, A. Gerasimov
A method for defining the inertia constant of a generating unit is proposed. It is based on a synchrophasor measurements approximation using the generator rotor swing equation. The input includes the measurements of the generator active power and rotor angle during electromechanical transients. The approach was validated by means of a mathematical simulation, experiments on the physical model and using field measurements during transients in the power system. The obtained results may be used for the simplified generating unit dynamic models application in transient analysis.
{"title":"Defining the equivalent inertia constant of generating unit based on electromechanical transient measurements","authors":"D. Bliznyuk, A. Berdin, A. Gerasimov","doi":"10.1109/RTUCON.2016.7763098","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763098","url":null,"abstract":"A method for defining the inertia constant of a generating unit is proposed. It is based on a synchrophasor measurements approximation using the generator rotor swing equation. The input includes the measurements of the generator active power and rotor angle during electromechanical transients. The approach was validated by means of a mathematical simulation, experiments on the physical model and using field measurements during transients in the power system. The obtained results may be used for the simplified generating unit dynamic models application in transient analysis.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127011457","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763123
A. Khalyasmaa, S. Dmitriev, A. Romanov
Overhead transmission lines integral assessment problem is considered in the paper. Failures diagnostic and analysis procedure based on artificial intelligence techniques is presented. The tool set for integral diagnostic of overhead lines and infrastructure is established. The possibility of the present tools arrangement on the base of land and air based autonomous mobile robots is offered. The concept of autonomous robotic intelligence laboratory creation for overhead power lines integral assessment comprising unmanned air vehicles, diagnostic tools set, servers for intelligent information processing and also equipment for laboratory independent operation in field conditions is offered.
{"title":"Robotic intelligence laboratory for overhead transmission lines assessment","authors":"A. Khalyasmaa, S. Dmitriev, A. Romanov","doi":"10.1109/RTUCON.2016.7763123","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763123","url":null,"abstract":"Overhead transmission lines integral assessment problem is considered in the paper. Failures diagnostic and analysis procedure based on artificial intelligence techniques is presented. The tool set for integral diagnostic of overhead lines and infrastructure is established. The possibility of the present tools arrangement on the base of land and air based autonomous mobile robots is offered. The concept of autonomous robotic intelligence laboratory creation for overhead power lines integral assessment comprising unmanned air vehicles, diagnostic tools set, servers for intelligent information processing and also equipment for laboratory independent operation in field conditions is offered.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"52 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131304258","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763131
J. Beriņš
This article is about one of the alternative forms of energy - the algorithm for the development of a sea wave energy converter, which is based on reflection, refraction, diffraction and interference analysis between waves and their energy transformers. This article provides information to the placement of a wave energy converter receiver, specially calculated parallel to the surface, thereby allowing obtaining wave energy step by step. It provides an insight into wave power plant optimization principles.
{"title":"Technical analysis of the economic viability of sea wave power stations","authors":"J. Beriņš","doi":"10.1109/RTUCON.2016.7763131","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763131","url":null,"abstract":"This article is about one of the alternative forms of energy - the algorithm for the development of a sea wave energy converter, which is based on reflection, refraction, diffraction and interference analysis between waves and their energy transformers. This article provides information to the placement of a wave energy converter receiver, specially calculated parallel to the surface, thereby allowing obtaining wave energy step by step. It provides an insight into wave power plant optimization principles.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133656907","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763129
A. Sauhats, R. Petrichenko, Z. Broka, K. Baltputnis, Dmitrijs Soboļevskis
Reservoir inflow forecasting with artificial neural networks is presented in this paper. Different types of ANN input data were considered such as temperature, precipitation and historical water inflow. Performance of the hourly inflow forecasts was assessed based on a case study of a specific hydropower reservoir in Latvia. The results showed that all the approaches had similar prediction errors implying that for optimal hydropower scheduling uncertainties need to be modelled which is also proposed in this study through generation of several forecast realisations in addition to point predictions.
{"title":"ANN-based forecasting of hydropower reservoir inflow","authors":"A. Sauhats, R. Petrichenko, Z. Broka, K. Baltputnis, Dmitrijs Soboļevskis","doi":"10.1109/RTUCON.2016.7763129","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763129","url":null,"abstract":"Reservoir inflow forecasting with artificial neural networks is presented in this paper. Different types of ANN input data were considered such as temperature, precipitation and historical water inflow. Performance of the hourly inflow forecasts was assessed based on a case study of a specific hydropower reservoir in Latvia. The results showed that all the approaches had similar prediction errors implying that for optimal hydropower scheduling uncertainties need to be modelled which is also proposed in this study through generation of several forecast realisations in addition to point predictions.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131295354","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763147
V. Oboskalov, Anatoly Mahnitko, J. Gerhards, D. Ignatiev
Problems of a generation system reduction in calculations of a power system (PS) adequacy are considered. The attention is mostly focused on mathematical models, based on the binominal and Poisson distributions, Poisson failure flows and characteristic functions of random variables. The reduction procedures result in the disturbance of integer number of units in operation. It was shown that it is appropriate to carry out rounding-off and following correction of probabilistic indices using the criteria of capacities at hand and expected values of generation tripped equality. As a result of models comparison the preference is made for models, based on the binominal and Poisson distributions. In the case of huge PS units diversification the combined distribution is assumed to be used, emphasizing units with the highest capacity and equivalent the rest, in order to perform adjusted calculations by means of computer.
{"title":"Probabilistic reduction of generation in adequacy calculation","authors":"V. Oboskalov, Anatoly Mahnitko, J. Gerhards, D. Ignatiev","doi":"10.1109/RTUCON.2016.7763147","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763147","url":null,"abstract":"Problems of a generation system reduction in calculations of a power system (PS) adequacy are considered. The attention is mostly focused on mathematical models, based on the binominal and Poisson distributions, Poisson failure flows and characteristic functions of random variables. The reduction procedures result in the disturbance of integer number of units in operation. It was shown that it is appropriate to carry out rounding-off and following correction of probabilistic indices using the criteria of capacities at hand and expected values of generation tripped equality. As a result of models comparison the preference is made for models, based on the binominal and Poisson distributions. In the case of huge PS units diversification the combined distribution is assumed to be used, emphasizing units with the highest capacity and equivalent the rest, in order to perform adjusted calculations by means of computer.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125102228","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763108
D. Bezrukovs, A. Sauhatas
The paper uses daily historical data on electricity prices in the Latvian segment of Nord Pool power market in combination with wind speed measurements conducted in the north-western part of the country in order to perform revenue forecast for a wind power generator park and access the economic feasibility of such projects in Latvia. The forecast of revenues is based on two stochastic differential equation models calibrated on the historical data of wind speed and electricity prices. Pre-testing procedures suggest that mean reverting Vasicek model can be used for wind speed modelling, while electricity price development is better described by a mean reverting model with jump diffusion. Monte Carlo simulation approach is used to generate the distribution of forecasted revenues and estimate project returns taking into consideration the cost structure and technical characteristics of an existing wind power plant in Latvia. The results of the study show that, given the historical market prices of electricity, wind energy potential on the north-western part of Latvia is insufficient to justify the construction of wind energy farms in the region for the considered wind generator type. In the absence of state support, a prudent approach to the selection of wind generator types should be chosen.
{"title":"The application of stochastic differential equation models in the assessment of the economic feasibility of wind energy projects in Latvia","authors":"D. Bezrukovs, A. Sauhatas","doi":"10.1109/RTUCON.2016.7763108","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763108","url":null,"abstract":"The paper uses daily historical data on electricity prices in the Latvian segment of Nord Pool power market in combination with wind speed measurements conducted in the north-western part of the country in order to perform revenue forecast for a wind power generator park and access the economic feasibility of such projects in Latvia. The forecast of revenues is based on two stochastic differential equation models calibrated on the historical data of wind speed and electricity prices. Pre-testing procedures suggest that mean reverting Vasicek model can be used for wind speed modelling, while electricity price development is better described by a mean reverting model with jump diffusion. Monte Carlo simulation approach is used to generate the distribution of forecasted revenues and estimate project returns taking into consideration the cost structure and technical characteristics of an existing wind power plant in Latvia. The results of the study show that, given the historical market prices of electricity, wind energy potential on the north-western part of Latvia is insufficient to justify the construction of wind energy farms in the region for the considered wind generator type. In the absence of state support, a prudent approach to the selection of wind generator types should be chosen.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124252102","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763148
A. Fedotov, Alexander K. Fedotov, A. Tolstik, A. Zabasta, A. Zhiravecka, N. Kunicina, L. Ribickis
The article presents a case study of experience sharing between the EU universities and the EU neighborhood area - Belarus. The aim of this study is to facilitate the Bologna process joining by the Belarusian higher education system and, in particular, to consider challenges related to the labor market in the field of physics specialties due to upcoming changes in the qualification of university graduates. Before joining the Bologna process, the Ministry of Education has set the proportions of 5- and 6-year graduates specializing in physics as 90% and 10%. The enhancement of cooperation between HEI and labor market is essential to perform successful transfer to the Bologna-like 4-year higher education system. Of particular importance is the organization of master students internship and practice in order to meet the labor market needs.
{"title":"Evaluation of market needs in Belarus for improvement of master-level education in the field of physical sciences","authors":"A. Fedotov, Alexander K. Fedotov, A. Tolstik, A. Zabasta, A. Zhiravecka, N. Kunicina, L. Ribickis","doi":"10.1109/RTUCON.2016.7763148","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763148","url":null,"abstract":"The article presents a case study of experience sharing between the EU universities and the EU neighborhood area - Belarus. The aim of this study is to facilitate the Bologna process joining by the Belarusian higher education system and, in particular, to consider challenges related to the labor market in the field of physics specialties due to upcoming changes in the qualification of university graduates. Before joining the Bologna process, the Ministry of Education has set the proportions of 5- and 6-year graduates specializing in physics as 90% and 10%. The enhancement of cooperation between HEI and labor market is essential to perform successful transfer to the Bologna-like 4-year higher education system. Of particular importance is the organization of master students internship and practice in order to meet the labor market needs.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114531107","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763153
V. Bolgova, A. Leonov, D. Charkov
Currently the frequency control is widely used to provide high level of induction motors efficiency. Studies show that typical for the variable frequency drive (VFD) severe electro-thermal stresses influencing on the windings insulation negatively affect the windings reliability. The need to thoroughly study the impact of influencing factors and to develop possible ways to minimize this impact stipulates the relevance of conducted research. In this paper the influence of the VFD parameters on the level of voltage stresses affecting the insulation of low-voltage induction motor windings is studied. The study of nature and magnitude of electrical stresses was carried out by building a simulation model in the graphical programming environment Matlab Simulink. The modelling results are presented and the main findings are discussed in this paper.
{"title":"Influence of VFD parameters on voltage stresses in low voltage windings","authors":"V. Bolgova, A. Leonov, D. Charkov","doi":"10.1109/RTUCON.2016.7763153","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763153","url":null,"abstract":"Currently the frequency control is widely used to provide high level of induction motors efficiency. Studies show that typical for the variable frequency drive (VFD) severe electro-thermal stresses influencing on the windings insulation negatively affect the windings reliability. The need to thoroughly study the impact of influencing factors and to develop possible ways to minimize this impact stipulates the relevance of conducted research. In this paper the influence of the VFD parameters on the level of voltage stresses affecting the insulation of low-voltage induction motor windings is studied. The study of nature and magnitude of electrical stresses was carried out by building a simulation model in the graphical programming environment Matlab Simulink. The modelling results are presented and the main findings are discussed in this paper.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116606791","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763125
H. Kirkham, A. Riepnieks
The paper sets aside details of instrumentality to reveal the nature of the problem addressed by measurement. Its title is based on the title of a 1894 paper by Prof. W.E. Ayrton and his student H.C. Haycraft. They described a new and simplified method of measurement to improve the teaching of their underlying topic, and that is the goal of this paper. In the work described here, the measurand is taken to be an equation representing an alternating signal, and the declared values of the measurement are estimates of the parameters of the equation. It is shown that the parameters of the ac signal can be found by curve-fitting. Lessons can be drawn about the role of noise in measurement and about the very meaning of the result.
{"title":"Students' simple method for determining the parameters of an AC signal","authors":"H. Kirkham, A. Riepnieks","doi":"10.1109/RTUCON.2016.7763125","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763125","url":null,"abstract":"The paper sets aside details of instrumentality to reveal the nature of the problem addressed by measurement. Its title is based on the title of a 1894 paper by Prof. W.E. Ayrton and his student H.C. Haycraft. They described a new and simplified method of measurement to improve the teaching of their underlying topic, and that is the goal of this paper. In the work described here, the measurand is taken to be an equation representing an alternating signal, and the declared values of the measurement are estimates of the parameters of the equation. It is shown that the parameters of the ac signal can be found by curve-fitting. Lessons can be drawn about the role of noise in measurement and about the very meaning of the result.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125711350","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 : 2016-10-01DOI: 10.1109/RTUCON.2016.7763120
V. M. Barinov, D. Kiesewetter
The results of experimental measurements of currents and voltages in the elements of cable power lines and communication lines at occurrence of single-phase short-circuit of power cable lines 110 and 220 kV are present. The effect of the short circuits on the operation of the communication cable lines that are laid in the same trench with power cables is evaluated. Explanations to the emerging effects and recommendations for practical use of the results obtained in design, operation and repair of cable lines are given.
{"title":"Experimental study of the influence of single-phase short-circuits of power cable lines 110 and 220 kV on the operation of communications systems and automation","authors":"V. M. Barinov, D. Kiesewetter","doi":"10.1109/RTUCON.2016.7763120","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763120","url":null,"abstract":"The results of experimental measurements of currents and voltages in the elements of cable power lines and communication lines at occurrence of single-phase short-circuit of power cable lines 110 and 220 kV are present. The effect of the short circuits on the operation of the communication cable lines that are laid in the same trench with power cables is evaluated. Explanations to the emerging effects and recommendations for practical use of the results obtained in design, operation and repair of cable lines are given.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127443131","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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