Pub Date : 2016-10-01DOI: 10.1109/RTUCON.2016.7763084
O. Vozisova, D. Bliznyuk, A. Egorov, D. Snegirev, E. Koksharova
Electric power system kit is the project for production of power and secondary equipment scale models. The development of element base, which includes the main types of electric power equipment, is implemented within the framework of the project. The very article shows the technological process and the principal stages of production, using the example of modular integrated transformer substation. 3D printing techniques gives a new power systems equipment industrial designing methods. In article considered a new constructor (kit) of modular integrated transformer substation, LLC “Module”. The whole production process is implemented by students. Speaking about educational process, students who work in the framework of the project get knowledge about power equipment structure. This aspect improve the quality of the education and students personal skills, which are of great importance for further employment in electric power industry.
{"title":"Electric power system kit. Modular integrated transformer substation","authors":"O. Vozisova, D. Bliznyuk, A. Egorov, D. Snegirev, E. Koksharova","doi":"10.1109/RTUCON.2016.7763084","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763084","url":null,"abstract":"Electric power system kit is the project for production of power and secondary equipment scale models. The development of element base, which includes the main types of electric power equipment, is implemented within the framework of the project. The very article shows the technological process and the principal stages of production, using the example of modular integrated transformer substation. 3D printing techniques gives a new power systems equipment industrial designing methods. In article considered a new constructor (kit) of modular integrated transformer substation, LLC “Module”. The whole production process is implemented by students. Speaking about educational process, students who work in the framework of the project get knowledge about power equipment structure. This aspect improve the quality of the education and students personal skills, which are of great importance for further employment in electric power industry.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"45 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":"131507979","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.2016.7763093
D. Bliznyuk, A. Berdin, I. Romanov
Correct and updated estimation of the load models parameters plays a significant role in power systems studies. These parameters can be estimated using the data registered by WAMS during contingencies in the power system. A method of the load model parameters estimation based on the system state analysis is proposed in this paper. Parameters of various types of load models can be estimated and an information on the type and structure of load is not necessarily needed. Correctness of obtained load models parameters is checked using the physical power system simulator and EUROSTAG digital models. The estimated load model parameters provide the better quality for digital power systems models than type-parameters.
{"title":"PMU data analysis for load characteristics estimation","authors":"D. Bliznyuk, A. Berdin, I. Romanov","doi":"10.1109/RTUCON.2016.7763093","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763093","url":null,"abstract":"Correct and updated estimation of the load models parameters plays a significant role in power systems studies. These parameters can be estimated using the data registered by WAMS during contingencies in the power system. A method of the load model parameters estimation based on the system state analysis is proposed in this paper. Parameters of various types of load models can be estimated and an information on the type and structure of load is not necessarily needed. Correctness of obtained load models parameters is checked using the physical power system simulator and EUROSTAG digital models. The estimated load model parameters provide the better quality for digital power systems models than type-parameters.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"25 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":"131854840","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.2016.7763128
Z. Broka, J. Kozadajevs, A. Sauhats, D. Finn, W. Turner
This paper presents an inverse modelling approach for deriving equivalent thermal parameters of buildings. A simplified thermal network based on electrical analogy was developed to replicate building thermal dynamics and model residential heat demand. The study employs data driven blackbox modelling based on the measured indoor and outdoor temperature. To validate the proposed method, virtual and physical experiments were conducted and performance of the simplified thermal network model was compared to two more complex RC models and measurements in an existing building. The simplified model was able to replicate the thermal dynamics of the complex models and the building with a high accuracy at the same conditions under which model parameters were estimated implying that for accurate modelling a large amount of experimental data obtained under various conditions is required. Such data will be gathered in the upcoming studies from 50 buildings in Latvia. The obtained data will then be used to model the aggregate heating demand at a national scale for assessment of the impact of smart electric thermal storage appliances on the overall power system.
{"title":"Modelling residential heat demand supplied by a local smart electric thermal storage system","authors":"Z. Broka, J. Kozadajevs, A. Sauhats, D. Finn, W. Turner","doi":"10.1109/RTUCON.2016.7763128","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763128","url":null,"abstract":"This paper presents an inverse modelling approach for deriving equivalent thermal parameters of buildings. A simplified thermal network based on electrical analogy was developed to replicate building thermal dynamics and model residential heat demand. The study employs data driven blackbox modelling based on the measured indoor and outdoor temperature. To validate the proposed method, virtual and physical experiments were conducted and performance of the simplified thermal network model was compared to two more complex RC models and measurements in an existing building. The simplified model was able to replicate the thermal dynamics of the complex models and the building with a high accuracy at the same conditions under which model parameters were estimated implying that for accurate modelling a large amount of experimental data obtained under various conditions is required. Such data will be gathered in the upcoming studies from 50 buildings in Latvia. The obtained data will then be used to model the aggregate heating demand at a national scale for assessment of the impact of smart electric thermal storage appliances on the overall power system.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 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":"130888080","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.2016.7763089
N. Zhuravleva, A. Reznik, D. Kiesewetter, Anna Tukacheva, E. Smirnova
The thermal aging of insulating fluids and papers in composition of paper-impregnated insulation was investigated. Electrical and optical characteristics of the mixture of petroleum oil and synthetic ester are studied. The mechanical and electrical properties of the paper before and after aging were measured. The sorption capacity of some types of cellulose paper was evaluated. The significant dependence of the type of cellulose paper on change of parameters of paper-impregnated insulation at aging was revealed.
{"title":"About the possibilities of increasing the reliability of paper-impregnated insulation of power transformers","authors":"N. Zhuravleva, A. Reznik, D. Kiesewetter, Anna Tukacheva, E. Smirnova","doi":"10.1109/RTUCON.2016.7763089","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763089","url":null,"abstract":"The thermal aging of insulating fluids and papers in composition of paper-impregnated insulation was investigated. Electrical and optical characteristics of the mixture of petroleum oil and synthetic ester are studied. The mechanical and electrical properties of the paper before and after aging were measured. The sorption capacity of some types of cellulose paper was evaluated. The significant dependence of the type of cellulose paper on change of parameters of paper-impregnated insulation at aging was revealed.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"56 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":"114633005","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.2016.7763119
R. Melsas, A. Rosin, I. Drovtar
Demand side response enables cost optimization for energy systems and consumers. By tradition, the target of the demand side response is to shift the loads from high price or peak-load periods to low price or low consumption periods. The economic effect is derived from reduced energy purchasing costs. This paper focuses on the possibility to provide demand side response for a wind park through direct cooperation by means of reduced production forecast errors. These errors are costly, as in open electricity market, overproduction is usually sold at a lower price and in underproduction it is required to purchase balancing energy from an electricity market. Forecasting errors always occur, as a forecast consists of wind speed predictions and does not take into account unexpected stops. Demand side response will reduce the imbalance between forecasted and actual production in wind parks. Direct cooperation between a response provider and a wind park is complex, as the forecast errors will define the need for the demand side response. For that reason, it is required to analyze wind park forecast errors in order to define the requirements for the demand side response capacity and an energy storage size. On the other hand, the solution proposed in this paper has benefits, as a demand side response provider does not need to participate in energy market. From that fact electricity market requirements are not applicable, as an example there is no need to have certain capacity available to participate in market.
{"title":"Wind park cost efficiency increase through direct cooperation with demand side response provider","authors":"R. Melsas, A. Rosin, I. Drovtar","doi":"10.1109/RTUCON.2016.7763119","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763119","url":null,"abstract":"Demand side response enables cost optimization for energy systems and consumers. By tradition, the target of the demand side response is to shift the loads from high price or peak-load periods to low price or low consumption periods. The economic effect is derived from reduced energy purchasing costs. This paper focuses on the possibility to provide demand side response for a wind park through direct cooperation by means of reduced production forecast errors. These errors are costly, as in open electricity market, overproduction is usually sold at a lower price and in underproduction it is required to purchase balancing energy from an electricity market. Forecasting errors always occur, as a forecast consists of wind speed predictions and does not take into account unexpected stops. Demand side response will reduce the imbalance between forecasted and actual production in wind parks. Direct cooperation between a response provider and a wind park is complex, as the forecast errors will define the need for the demand side response. For that reason, it is required to analyze wind park forecast errors in order to define the requirements for the demand side response capacity and an energy storage size. On the other hand, the solution proposed in this paper has benefits, as a demand side response provider does not need to participate in energy market. From that fact electricity market requirements are not applicable, as an example there is no need to have certain capacity available to participate in market.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"28 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":"121865497","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.2016.7763088
A. Aksjonov, V. Vodovozov, E. Petlenkov
An adaptive fuzzy logic controller for crane positioning along five axes including the self-scaling procedure with an anti-swing regulation is proposed. A fuzzy logic observer with self-tuning universe of discourse is described and experimentally verified on laboratory gantry and tower crane hardware-in-the-loop systems. An anti-swing performance for various load masses is provided. The offered approach guarantees the control precision and reliability and proves to be less dependable on human experts thus eliminating one of the most time-consuming and expensive parts of the crane control system.
{"title":"Self-scaling laboratory crane fuzzy logic control with anti-swing regulation","authors":"A. Aksjonov, V. Vodovozov, E. Petlenkov","doi":"10.1109/RTUCON.2016.7763088","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763088","url":null,"abstract":"An adaptive fuzzy logic controller for crane positioning along five axes including the self-scaling procedure with an anti-swing regulation is proposed. A fuzzy logic observer with self-tuning universe of discourse is described and experimentally verified on laboratory gantry and tower crane hardware-in-the-loop systems. An anti-swing performance for various load masses is provided. The offered approach guarantees the control precision and reliability and proves to be less dependable on human experts thus eliminating one of the most time-consuming and expensive parts of the crane control system.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"17 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":"132006411","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.2016.7763139
R. Oļekšijs, O. Linkevičs
This paper analyzes influence of different operation regimes on CHP main electrical equipment reliability. Authors use statistics and Monte-Carlo method based simulation to evaluate influence of different operating regimes on synchronous generator, main circuit breaker and step-up power transformer reliability. Results are compared to VGB Powertech CHP fault statistic.
{"title":"Failure simulation model for evaluation of CHP electrical equipment reliability","authors":"R. Oļekšijs, O. Linkevičs","doi":"10.1109/RTUCON.2016.7763139","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763139","url":null,"abstract":"This paper analyzes influence of different operation regimes on CHP main electrical equipment reliability. Authors use statistics and Monte-Carlo method based simulation to evaluate influence of different operating regimes on synchronous generator, main circuit breaker and step-up power transformer reliability. Results are compared to VGB Powertech CHP fault statistic.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 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":"130979680","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.2016.7763106
T. Tereschenko, J. Yamnenko
The article aims to investigate the influence of sub-modulating function form to the harmonic structure of output voltage and coefficient of power-supply voltage use in the systems with multilevel inverters. Comparative analysis for different types of modulation and different sub-modulating functions shows the advantage of multi-level inverter with APWM.
{"title":"Amplitude PWM with increased factor of source voltage use","authors":"T. Tereschenko, J. Yamnenko","doi":"10.1109/RTUCON.2016.7763106","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763106","url":null,"abstract":"The article aims to investigate the influence of sub-modulating function form to the harmonic structure of output voltage and coefficient of power-supply voltage use in the systems with multilevel inverters. Comparative analysis for different types of modulation and different sub-modulating functions shows the advantage of multi-level inverter with APWM.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"27 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":"116057496","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.2016.7763092
R. Cabadag, Jörg Dickert, U. Schmidt, P. Schegner
There has been remarkable increase in the amount of decentralized wind farms (WFs) in sub-transmission grids. The high penetration of WFs causes complicated impacts on power flows and voltages. Therefore, WFs have to operate bus voltages of the sub-transmission grid continuously within a permissible range. Furthermore, WFs should transfer required amount of reactive power into transmission grid and/or absorb the necessary amount of reactive power in the sub-transmission considering the demand of transmission system operators (TSOs). In other words, reactive power requirements at connection points (CPs) where sub-transmission grids are connected to the transmission grids should be satisfied. Therefore, this paper presents a comparative analysis for reactive power management by WFs in subtransmission grids using both a novel linear programming (LP) approach based on voltage sensitivity and particle swarm optimization (PSO).
{"title":"Providing reactive power requirements of sub-transmission grids by decentralized wind farms","authors":"R. Cabadag, Jörg Dickert, U. Schmidt, P. Schegner","doi":"10.1109/RTUCON.2016.7763092","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763092","url":null,"abstract":"There has been remarkable increase in the amount of decentralized wind farms (WFs) in sub-transmission grids. The high penetration of WFs causes complicated impacts on power flows and voltages. Therefore, WFs have to operate bus voltages of the sub-transmission grid continuously within a permissible range. Furthermore, WFs should transfer required amount of reactive power into transmission grid and/or absorb the necessary amount of reactive power in the sub-transmission considering the demand of transmission system operators (TSOs). In other words, reactive power requirements at connection points (CPs) where sub-transmission grids are connected to the transmission grids should be satisfied. Therefore, this paper presents a comparative analysis for reactive power management by WFs in subtransmission grids using both a novel linear programming (LP) approach based on voltage sensitivity and particle swarm optimization (PSO).","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 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":"121037033","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.2016.7763102
K. Kroičs, J. Zakis, U. Sirmelis
The main advantages of the interleaved multiphase DC-DC converters over single-phase converters are reduced current stress and reduced output current ripple. However, inductor current ripple can not be reduced only by interleaving method. The integrated magnetic structure can be used to solve this problem and this also allows to achieve higher power density. In this paper application of combination of the 2-phase directly coupled inductor and 2-phase inversely coupled inductor is analyzed to developed 4-phase interleaved DC-DC converter and compared with using of separate auxiliary inductor. The prototype of the converter has been built. The experimental results of the current ripple are presented in the paper.
{"title":"Multiphase interleaved DC-DC converter with directly and inversely coupled inductors","authors":"K. Kroičs, J. Zakis, U. Sirmelis","doi":"10.1109/RTUCON.2016.7763102","DOIUrl":"https://doi.org/10.1109/RTUCON.2016.7763102","url":null,"abstract":"The main advantages of the interleaved multiphase DC-DC converters over single-phase converters are reduced current stress and reduced output current ripple. However, inductor current ripple can not be reduced only by interleaving method. The integrated magnetic structure can be used to solve this problem and this also allows to achieve higher power density. In this paper application of combination of the 2-phase directly coupled inductor and 2-phase inversely coupled inductor is analyzed to developed 4-phase interleaved DC-DC converter and compared with using of separate auxiliary inductor. The prototype of the converter has been built. The experimental results of the current ripple are presented in the paper.","PeriodicalId":102691,"journal":{"name":"2016 57th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"517 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":"133227099","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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