Pub Date : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316549
J. Teremranova, A. Sauhats
The electrification of urban infrastructure, and in particular households, has been approved as one of the effective decarbonization measures. Reducing CO2emissions has become a requirement of the time and is also considered by each country separately within the existing capabilities. In order to identify the most acceptable solution for Latvia on this issue, we calculated 6 scenarios of energy savings when gas stoves were substituted with electric and induction ones. Additionally, the costs of electrifying stoves vs cars for Latvian households was compared. Technical assessment of decarbonization potential revealed that the most adaptive way for CO2reduction in households is to concentrate efforts first on electrification of stoves in Latvian kitchens; and most preferable first step - to begin with equipment that uses LPG. This helps to implement NECP requirements concerning household sector decarbonization in the most effective and frugal way.
{"title":"Electrification and Decarbonization Potential Assessment of Latvian Dwellings","authors":"J. Teremranova, A. Sauhats","doi":"10.1109/RTUCON51174.2020.9316549","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316549","url":null,"abstract":"The electrification of urban infrastructure, and in particular households, has been approved as one of the effective decarbonization measures. Reducing CO2emissions has become a requirement of the time and is also considered by each country separately within the existing capabilities. In order to identify the most acceptable solution for Latvia on this issue, we calculated 6 scenarios of energy savings when gas stoves were substituted with electric and induction ones. Additionally, the costs of electrifying stoves vs cars for Latvian households was compared. Technical assessment of decarbonization potential revealed that the most adaptive way for CO2reduction in households is to concentrate efforts first on electrification of stoves in Latvian kitchens; and most preferable first step - to begin with equipment that uses LPG. This helps to implement NECP requirements concerning household sector decarbonization in the most effective and frugal way.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115210409","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316566
R. Oļekšijs, A. Sauhats, B. Olekshii
this paper analyzes possibilities to form coalition of several heat energy providers to participate in district heating market considering open electricity market. Cooperation would allow to better dispatch existing energy sources and ensure higher total profit for participants. To optimize coalition operation mixed integer linear programming is used, additional profit is shared between parties according to Shapley value. Case study based on historical hourly data is provided.
{"title":"Generator cooperation in district heating market considering open electricity market","authors":"R. Oļekšijs, A. Sauhats, B. Olekshii","doi":"10.1109/RTUCON51174.2020.9316566","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316566","url":null,"abstract":"this paper analyzes possibilities to form coalition of several heat energy providers to participate in district heating market considering open electricity market. Cooperation would allow to better dispatch existing energy sources and ensure higher total profit for participants. To optimize coalition operation mixed integer linear programming is used, additional profit is shared between parties according to Shapley value. Case study based on historical hourly data is provided.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116092879","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316582
A. Naumov, Alexander Kivircik, S. Popov, A. Bogdanov
Intermittent arc faults make about 60% out of all earth faults in 6–35 kV grids [1]. Modern relay-protection and automatics devices not always able to process properly current, voltage signals, and to ensure reliable operation in all possible situations (inadequate reaction of protection algorithms, errors in their functioning) due to specific features of this fault, such as: short period of existence, about dozens of milliseconds [1], high-frequency transient processes, nonconstant equivalent resistance.
{"title":"Reliability of relay protection and automatics algorithms for intermittent ground faults in 6–35 kV networks","authors":"A. Naumov, Alexander Kivircik, S. Popov, A. Bogdanov","doi":"10.1109/RTUCON51174.2020.9316582","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316582","url":null,"abstract":"Intermittent arc faults make about 60% out of all earth faults in 6–35 kV grids [1]. Modern relay-protection and automatics devices not always able to process properly current, voltage signals, and to ensure reliable operation in all possible situations (inadequate reaction of protection algorithms, errors in their functioning) due to specific features of this fault, such as: short period of existence, about dozens of milliseconds [1], high-frequency transient processes, nonconstant equivalent resistance.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124077376","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316550
N. Kunicina, A. Zabasta, A. Patlins, I. Bilić, Jānis Pekša
Current article shows the prototyping process, types of prototyping models, best practices of prototyping, limitations of prototypes, advantages, and disadvantages of prototyping, as well as differences between software and hardware prototyping. Prototyping infrastructures are also shown here. In this case, three examples from Riga Technical University are offered. This publication demonstrates the authors' opinions only, and it cannot be regarded as the European Union's official position. The paper is developed in a frame of the project “ERASMUS+ Capacity-building in the Field of Higher Education 2019 Call for Proposals. Development of practically-oriented student-centered education in the field of modeling of Cyber-Physical Systems, CybPhys. 609557-EPP-1-2019-1-LV-EPPKA2-CBHE-JP - ERASMUS+ CBHE. The article is also devised for students of applied physic and electrical engineering specialties. The article can be useful for students and professionals focusing on innovation management issues.
{"title":"Prototyping process in education and science","authors":"N. Kunicina, A. Zabasta, A. Patlins, I. Bilić, Jānis Pekša","doi":"10.1109/RTUCON51174.2020.9316550","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316550","url":null,"abstract":"Current article shows the prototyping process, types of prototyping models, best practices of prototyping, limitations of prototypes, advantages, and disadvantages of prototyping, as well as differences between software and hardware prototyping. Prototyping infrastructures are also shown here. In this case, three examples from Riga Technical University are offered. This publication demonstrates the authors' opinions only, and it cannot be regarded as the European Union's official position. The paper is developed in a frame of the project “ERASMUS+ Capacity-building in the Field of Higher Education 2019 Call for Proposals. Development of practically-oriented student-centered education in the field of modeling of Cyber-Physical Systems, CybPhys. 609557-EPP-1-2019-1-LV-EPPKA2-CBHE-JP - ERASMUS+ CBHE. The article is also devised for students of applied physic and electrical engineering specialties. The article can be useful for students and professionals focusing on innovation management issues.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121762980","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316604
V. Astapov, Sambeet Mishra, I. Palu, Sergei Trashchenkov
The power grid is facing challenges to ensure the power quality and security while new and distributed generation units are increasing in the power grid. The share of electrical vehicles (EVs) are increasing in recent period to reduce the emissions and efficient use of resources. The EVs can play a sustainable role in grid stability through power infeed to the grid and act as a storage unit. However, the role of EVs in outage scenarios requires more investigations to ensure the quality and security prospective. This paper sets out to outline the key factors and their inter-dependencies during a power outage for a distribution grid with EVs. For this investigation, various grid simulations are conducted, and the results are presented.
{"title":"The Role of Electrical Vehicles for Power Quality and Security during Outages in the Distribution Grid","authors":"V. Astapov, Sambeet Mishra, I. Palu, Sergei Trashchenkov","doi":"10.1109/RTUCON51174.2020.9316604","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316604","url":null,"abstract":"The power grid is facing challenges to ensure the power quality and security while new and distributed generation units are increasing in the power grid. The share of electrical vehicles (EVs) are increasing in recent period to reduce the emissions and efficient use of resources. The EVs can play a sustainable role in grid stability through power infeed to the grid and act as a storage unit. However, the role of EVs in outage scenarios requires more investigations to ensure the quality and security prospective. This paper sets out to outline the key factors and their inter-dependencies during a power outage for a distribution grid with EVs. For this investigation, various grid simulations are conducted, and the results are presented.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131073332","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316622
A. Semenov, A. Petrochenkov, A. Romodin, A. Leysle
Nowadays, the complex of equipment for the electric power system of an enterprise is a dynamic system. This is due to changes both in the operating mode of the equipment, and changes in the power supply scheme itself. To consider constantly changing parameters, monitoring systems are used that form unfiltered datasets with sets of information that changes in the time series. Due to the fact that datasets are formed constantly and at different objects of the power supply system, the flow of such information can already be used for short-term forecasting or creating a mathematical model of consumption and distribution of electric energy throughout the field. Under such conditions, the most convenient way of calculating, knowing the main parameters of the power system, is the matrix-topological method.
{"title":"Matrix-topological Calculation of Consumption and Distribution of Electric Energy in the Electric Power System Using a Filtered Dataset","authors":"A. Semenov, A. Petrochenkov, A. Romodin, A. Leysle","doi":"10.1109/RTUCON51174.2020.9316622","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316622","url":null,"abstract":"Nowadays, the complex of equipment for the electric power system of an enterprise is a dynamic system. This is due to changes both in the operating mode of the equipment, and changes in the power supply scheme itself. To consider constantly changing parameters, monitoring systems are used that form unfiltered datasets with sets of information that changes in the time series. Due to the fact that datasets are formed constantly and at different objects of the power supply system, the flow of such information can already be used for short-term forecasting or creating a mathematical model of consumption and distribution of electric energy throughout the field. Under such conditions, the most convenient way of calculating, knowing the main parameters of the power system, is the matrix-topological method.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133398501","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316620
Solumaz Noruzi, H. Ghoreishy, Ahmad Ale Ahmad, F. Tahami, Roya Ahmadiahangar, A. Rosin
In this paper, a new high-frequency method for controlling boost converter in Boundary Conduction Mode (BCM) is proposed. By changing the switching frequency in a specified range, the intended method maintains a boost converter in BCM despite input voltage and load changes. This high-frequency method is implemented in an analog form which is more cost-effective in comparison with digital implementation. In addition, GaN switches are employed instead of silicon ones, which have lower losses at high frequencies. Simulation and experimental results obtained from applying the proposed method on a bi-directional boost converter is indicative of the efficiency of the proposed strategy.
{"title":"Variable Frequency Control method of Boost Converter Operating in Boundary Conduction Mode","authors":"Solumaz Noruzi, H. Ghoreishy, Ahmad Ale Ahmad, F. Tahami, Roya Ahmadiahangar, A. Rosin","doi":"10.1109/RTUCON51174.2020.9316620","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316620","url":null,"abstract":"In this paper, a new high-frequency method for controlling boost converter in Boundary Conduction Mode (BCM) is proposed. By changing the switching frequency in a specified range, the intended method maintains a boost converter in BCM despite input voltage and load changes. This high-frequency method is implemented in an analog form which is more cost-effective in comparison with digital implementation. In addition, GaN switches are employed instead of silicon ones, which have lower losses at high frequencies. Simulation and experimental results obtained from applying the proposed method on a bi-directional boost converter is indicative of the efficiency of the proposed strategy.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126581139","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316599
K. Sejejs, E. Kamoliņš, M. Gorobetz, A. Potapovs
The goal of this research is to propose a simple and inexpensive solution to increase the reliability of the electric vehicle with traction switched reluctance motor (SRM) by the modification of control algorithm that is based not only on rotary encoder data but also on single-phase current. The paper presents the research of traction SRM, describes the developed control algorithms based on load angle detection by a rotary encoder and proposes a novel modified algorithm based on the difference of load-dependent variable phase current fragment. Test bench with SRM drive is developed and developed control algorithms are implemented in MCU software. Experimental results show the workability of the developed algorithms proving the opportunity to use single-phase current sensor for control of SRM with variable load.
{"title":"Control Algorithms Based on Load Angle and Phase Current Difference for Traction Switched Reluctance Motor","authors":"K. Sejejs, E. Kamoliņš, M. Gorobetz, A. Potapovs","doi":"10.1109/RTUCON51174.2020.9316599","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316599","url":null,"abstract":"The goal of this research is to propose a simple and inexpensive solution to increase the reliability of the electric vehicle with traction switched reluctance motor (SRM) by the modification of control algorithm that is based not only on rotary encoder data but also on single-phase current. The paper presents the research of traction SRM, describes the developed control algorithms based on load angle detection by a rotary encoder and proposes a novel modified algorithm based on the difference of load-dependent variable phase current fragment. Test bench with SRM drive is developed and developed control algorithms are implemented in MCU software. Experimental results show the workability of the developed algorithms proving the opportunity to use single-phase current sensor for control of SRM with variable load.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114669331","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316473
A. Bogdanovs, O. Krievs, L. Ribickis, J. Pforr
This paper proposes an optimized current balancing controller for automotive multi-phase DC converter with coupled inductors. By implementing a fuzzy logic controller, an optimal steady-state and enhanced transient behavior of converter phase current sharing has been achieved to avoid coupled inductor saturation. The proposed controller considers converter load change to be compatible with single DC link current sensor measurement and phase current reconstruction technics. The described control method performance is verified by simulation and experimental results on a 5-phase converter with coupled inductors and distributed DC link capacitors using indirect current measurement technique with one sensor.
{"title":"Fuzzy Logic Current Balancing Controller Implementation in an Automotive Multi-Phase DC Converter with Coupled Inductors","authors":"A. Bogdanovs, O. Krievs, L. Ribickis, J. Pforr","doi":"10.1109/RTUCON51174.2020.9316473","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316473","url":null,"abstract":"This paper proposes an optimized current balancing controller for automotive multi-phase DC converter with coupled inductors. By implementing a fuzzy logic controller, an optimal steady-state and enhanced transient behavior of converter phase current sharing has been achieved to avoid coupled inductor saturation. The proposed controller considers converter load change to be compatible with single DC link current sensor measurement and phase current reconstruction technics. The described control method performance is verified by simulation and experimental results on a 5-phase converter with coupled inductors and distributed DC link capacitors using indirect current measurement technique with one sensor.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114946599","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316587
H. Maheri, D. Vinnikov, A. Chub, V. Sidorov
The galvanically isolated full-bridge series resonant quasi-Z-source dc-dc converter is studied. It features two main operating modes, buck and boost, which correspond to the converter operation above and below the nominal voltage, respectively. Power loss models are developed for both operating modes to identify the mechanism of losses. They consider switching and conduction losses in the input-side switches, core and windings losses in the transformer and the quasi-Z-source inductor, and conduction losses in the voltage doubler rectifier diodes. The developed loss models are verified at three input voltages using a 300 W experimental prototype. The inaccuracy of the developed models does not exceed 2 W, which is acceptable in comparison with the maximum estimated power loss of over 12 W. The experimental and the estimated efficiency follow the same trend. Also, the estimated efficiency exceeds the measured by no more than 1% at full power.
{"title":"Power Loss Model and Efficiency Analysis of the Quasi-Z-Source Isolated Buck-Boost Converter with Wide Input Voltage and Load Range","authors":"H. Maheri, D. Vinnikov, A. Chub, V. Sidorov","doi":"10.1109/RTUCON51174.2020.9316587","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316587","url":null,"abstract":"The galvanically isolated full-bridge series resonant quasi-Z-source dc-dc converter is studied. It features two main operating modes, buck and boost, which correspond to the converter operation above and below the nominal voltage, respectively. Power loss models are developed for both operating modes to identify the mechanism of losses. They consider switching and conduction losses in the input-side switches, core and windings losses in the transformer and the quasi-Z-source inductor, and conduction losses in the voltage doubler rectifier diodes. The developed loss models are verified at three input voltages using a 300 W experimental prototype. The inaccuracy of the developed models does not exceed 2 W, which is acceptable in comparison with the maximum estimated power loss of over 12 W. The experimental and the estimated efficiency follow the same trend. Also, the estimated efficiency exceeds the measured by no more than 1% at full power.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128674160","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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