Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998200
A. Suzdalenko
The cost and size of switched mode power supplies can be reduced by eliminating the measurement of inductor's instantaneous current value. This paper discusses the implementation of current sensorless control algorithm for bidirectional half-bridge AC/DC converter that allows shaping inductor's current without current sensor. The operation of half-bridge converter has been simplified to an equivalent single-switch model that simplifies implementation of a digital control system. The simulation results have confirmed the analytical assumptions and correctness of mathematical model.
{"title":"Development of single-switch model for current sensorless control of bidirectional half-bridge AC/DC converter","authors":"A. Suzdalenko","doi":"10.1109/RTUCON.2014.6998200","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998200","url":null,"abstract":"The cost and size of switched mode power supplies can be reduced by eliminating the measurement of inductor's instantaneous current value. This paper discusses the implementation of current sensorless control algorithm for bidirectional half-bridge AC/DC converter that allows shaping inductor's current without current sensor. The operation of half-bridge converter has been simplified to an equivalent single-switch model that simplifies implementation of a digital control system. The simulation results have confirmed the analytical assumptions and correctness of mathematical model.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"27 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":"124454738","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.2014.6998207
K. Vītols, I. Galkin
A simple yet suitable energy meter has been developed and described to estimate the performance of a previously designed electric kart lithium ion battery pack cell balancing module. A brief introduction regarding the battery pack and battery management system with passive dissipative resistor balancing construction under investigation is given. Both hardware and software design of the energy measurement device is described. A simple charging/discharging experiment results are presented to show some basic properties of the battery system.
{"title":"Evaluation of cell balancing solution with a custom energy measurement device design","authors":"K. Vītols, I. Galkin","doi":"10.1109/RTUCON.2014.6998207","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998207","url":null,"abstract":"A simple yet suitable energy meter has been developed and described to estimate the performance of a previously designed electric kart lithium ion battery pack cell balancing module. A brief introduction regarding the battery pack and battery management system with passive dissipative resistor balancing construction under investigation is given. Both hardware and software design of the energy measurement device is described. A simple charging/discharging experiment results are presented to show some basic properties of the battery system.","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":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115018638","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.2014.6998213
O. Tetervenoks, I. Galkin
The operation stability and robustness are usually the main criteria for the practically implemented systems. This is especially critical in LED lighting applications, where voltage regulators are used to control current of nonlinear LED load. Also the parameters of the load significantly changes with the temperature change and bin change even for the same brand LEDs. The control system of LED driver must effectively compensate the above mentioned disturbances. In the scope of this article the inherent stability (open-loop frequency response) and the stability of closed loop-system of several converter topologies used in LED lighting applications are analyzed.
{"title":"Evaluation of stability of several LED drivers in smart lighting applications","authors":"O. Tetervenoks, I. Galkin","doi":"10.1109/RTUCON.2014.6998213","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998213","url":null,"abstract":"The operation stability and robustness are usually the main criteria for the practically implemented systems. This is especially critical in LED lighting applications, where voltage regulators are used to control current of nonlinear LED load. Also the parameters of the load significantly changes with the temperature change and bin change even for the same brand LEDs. The control system of LED driver must effectively compensate the above mentioned disturbances. In the scope of this article the inherent stability (open-loop frequency response) and the stability of closed loop-system of several converter topologies used in LED lighting applications are analyzed.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"7 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":"116162627","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.2014.6998223
V. Radziukynas, A. Klementavicius
The paper deals with the short-term forecasting of wind speed for the Laukžeme wind farm (Lithuania) using time series approach. The ARIMA model was selected and its best structure determined using the historical wind speed data (4 months) and varying both learning interval (3-5 days) of the model and the factual data averaging time (1-6 hours). The accuracy of forecasting was evaluated in terms of RMSE and absolute error. The forecasting results for 39 consecutive time intervals with 6-48 hourly forecasts are presented and discussed.
{"title":"Short-term wind speed forecasting with ARIMA model","authors":"V. Radziukynas, A. Klementavicius","doi":"10.1109/RTUCON.2014.6998223","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998223","url":null,"abstract":"The paper deals with the short-term forecasting of wind speed for the Laukžeme wind farm (Lithuania) using time series approach. The ARIMA model was selected and its best structure determined using the historical wind speed data (4 months) and varying both learning interval (3-5 days) of the model and the factual data averaging time (1-6 hours). The accuracy of forecasting was evaluated in terms of RMSE and absolute error. The forecasting results for 39 consecutive time intervals with 6-48 hourly forecasts are presented and discussed.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"180 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":"114421713","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.2014.6998176
Y. Sokol, V. Zamaruiev, A. Eresko, S. Krivosheev, V. Ivakhno, B. Styslo
The paper discusses ways to reduce the cost of photoenergy systems by a selecting of appropriate design and schematics of the installation components. To improve the efficiency of solar energy utilization new hybrid installations with solar radiation concentrators are proposed, which can supply not only electricity, but also heat, including hot water preparing. It is proposed to implement different structural and technological solutions, depending on the basic specialization of the installation: generation of electricity or thermal energy, the need for auxiliary source of electrical energy, etc.
{"title":"Cost-effective photoenergy installation","authors":"Y. Sokol, V. Zamaruiev, A. Eresko, S. Krivosheev, V. Ivakhno, B. Styslo","doi":"10.1109/RTUCON.2014.6998176","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998176","url":null,"abstract":"The paper discusses ways to reduce the cost of photoenergy systems by a selecting of appropriate design and schematics of the installation components. To improve the efficiency of solar energy utilization new hybrid installations with solar radiation concentrators are proposed, which can supply not only electricity, but also heat, including hot water preparing. It is proposed to implement different structural and technological solutions, depending on the basic specialization of the installation: generation of electricity or thermal energy, the need for auxiliary source of electrical energy, etc.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"38 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":"125475241","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.2014.6998178
L. Zemite, K. Briņķis, A. Kutjuns
Finland and Baltic States initiated Distribution Cert project realization, based on multifunctional professional educational system of Finland. Projects provide opportunities to harmonize Baltic vocational training (VET) systems with EU requirements and best Nordic practices. There is a practical working example of mutually beneficial collaboration between policymakers, employers and training service providers in Electricity sector. Efficient strategies of competence based qualifications and apprenticeship training systems, reducing repair duration and improving interruptions causes indices of human factors, installation quality, weather, maintenance and repairing quality.
{"title":"Distribution Cert projects - New approach for multinational network electricians qualification","authors":"L. Zemite, K. Briņķis, A. Kutjuns","doi":"10.1109/RTUCON.2014.6998178","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998178","url":null,"abstract":"Finland and Baltic States initiated Distribution Cert project realization, based on multifunctional professional educational system of Finland. Projects provide opportunities to harmonize Baltic vocational training (VET) systems with EU requirements and best Nordic practices. There is a practical working example of mutually beneficial collaboration between policymakers, employers and training service providers in Electricity sector. Efficient strategies of competence based qualifications and apprenticeship training systems, reducing repair duration and improving interruptions causes indices of human factors, installation quality, weather, maintenance and repairing quality.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"7 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":"121961721","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.2014.6998186
R. Elmanis-Helmanis, M. Griščenko
The study examines hydroelectric power generator characteristics, voltage quality, air gap and vibration, in different operational modes - no-load mode, 90, 45, 10 MW load, 90 MW load with -50 MVAr to 20 MVAr reactive power and synchronous compensator mode with 0 MW-20 MW active power and synchronous compensator mode with -10 MVAr to -60 MVAr reactive power. Developed framework for power quality and air gap measurements assessment of hydropower generator shows that correlation exists between voltage, air gap and vibration characteristics. Analysis and comparison of different operational modes are performed to identify, which modes are important during diagnostics of machine condition in hydroelectric generators.
{"title":"Study of generator modes effects on electric power quality and air gap","authors":"R. Elmanis-Helmanis, M. Griščenko","doi":"10.1109/RTUCON.2014.6998186","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998186","url":null,"abstract":"The study examines hydroelectric power generator characteristics, voltage quality, air gap and vibration, in different operational modes - no-load mode, 90, 45, 10 MW load, 90 MW load with -50 MVAr to 20 MVAr reactive power and synchronous compensator mode with 0 MW-20 MW active power and synchronous compensator mode with -10 MVAr to -60 MVAr reactive power. Developed framework for power quality and air gap measurements assessment of hydropower generator shows that correlation exists between voltage, air gap and vibration characteristics. Analysis and comparison of different operational modes are performed to identify, which modes are important during diagnostics of machine condition in hydroelectric generators.","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":"130904204","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.2014.6998215
Liisa Liivik, D. Vinnikov, J. Zakis
This paper discusses the performance improvement method of the recently popular galvanically isolated quasi-Z-source DC-DC converter. In order to decrease the conduction losses in the quasi-Z-source network and voltage doubler rectifier the replacement of diodes by the N-channel MOSFETs was analyzed. The proposed approach was validated by the computer simulations in PSIM environment with accurate models of the semiconductors based on the device datasheet values. Finally, the power losses and resulting efficiency of the proposed quasi-Z-source DC-DC converter with synchronous rectification were compared to those of the traditional topology.
{"title":"Simulation study of high step-up quasi-Z-source DC-DC converter with synchronous rectification","authors":"Liisa Liivik, D. Vinnikov, J. Zakis","doi":"10.1109/RTUCON.2014.6998215","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998215","url":null,"abstract":"This paper discusses the performance improvement method of the recently popular galvanically isolated quasi-Z-source DC-DC converter. In order to decrease the conduction losses in the quasi-Z-source network and voltage doubler rectifier the replacement of diodes by the N-channel MOSFETs was analyzed. The proposed approach was validated by the computer simulations in PSIM environment with accurate models of the semiconductors based on the device datasheet values. Finally, the power losses and resulting efficiency of the proposed quasi-Z-source DC-DC converter with synchronous rectification were compared to those of the traditional topology.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"105 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":"127156625","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.2014.6998211
A. Stepanov, A. Sokolovs, Laura Dzelzkaleja
Most of the solar trackers do not have any feedback of their position, so the only possibility to check real position is visual inspection. This paper describes a device that can be used to supervise solar trackers and in the case of faulty operations it sends alarm. The main task was to develop the device easy in implementation. The device implementation does not assume a rebuilding of solar tracker construction. It has to be stuck to back side of photovoltaic panel. An accelerometer in couple with magnetometer is used to measure real position of panel, and microcontroller checks the correctness of the position.
{"title":"Solar tracker supervisory system","authors":"A. Stepanov, A. Sokolovs, Laura Dzelzkaleja","doi":"10.1109/RTUCON.2014.6998211","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998211","url":null,"abstract":"Most of the solar trackers do not have any feedback of their position, so the only possibility to check real position is visual inspection. This paper describes a device that can be used to supervise solar trackers and in the case of faulty operations it sends alarm. The main task was to develop the device easy in implementation. The device implementation does not assume a rebuilding of solar tracker construction. It has to be stuck to back side of photovoltaic panel. An accelerometer in couple with magnetometer is used to measure real position of panel, and microcontroller checks the correctness of the position.","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":"121255157","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.2014.6998199
L. Adrian, L. Ribickis
Mobile robots are being utilized increasingly in many applications, which include the exploration of relatively unknown environments including aerial, undersea, volcanic or even alien environments such as the plateaus and deserts of Mars where the Curiosity or Rover robot and others continue to explore. Due to their mobile nature these robots present us with many problems in the area of energy conservation. Mobile robots require more efficient energy saving techniques, due to their inherent self-sustained and self-constrained energy systems. The article is intended to inspire research among the power electronics community on the possibilities of new restorative energy techniques, including the small changes to infrastructure required to enable utilization of these methods. The restorative energy device, described herein, denotes a device that harvests collectable power from the general motion, weight and inclinations of the machine in both factory and remote locations.
{"title":"Proposed Piezoelectric Energy Harvesting in Mobile Robotic Devices","authors":"L. Adrian, L. Ribickis","doi":"10.1109/RTUCON.2014.6998199","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998199","url":null,"abstract":"Mobile robots are being utilized increasingly in many applications, which include the exploration of relatively unknown environments including aerial, undersea, volcanic or even alien environments such as the plateaus and deserts of Mars where the Curiosity or Rover robot and others continue to explore. Due to their mobile nature these robots present us with many problems in the area of energy conservation. Mobile robots require more efficient energy saving techniques, due to their inherent self-sustained and self-constrained energy systems. The article is intended to inspire research among the power electronics community on the possibilities of new restorative energy techniques, including the small changes to infrastructure required to enable utilization of these methods. The restorative energy device, described herein, denotes a device that harvests collectable power from the general motion, weight and inclinations of the machine in both factory and remote locations.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"63 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":"132672058","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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