Pub Date : 2018-11-01DOI: 10.1109/RTUCON.2018.8659900
Mahmoud Aref, Ismaiel Ahmed, V. Oboskalov, A. Mahņitko, Aleksandrs Gavrilovs
This paper is aimed at investigating MPPT of PV system controlled by SPWM which is generated by comparing sinusoidal wave with variable frequency sawtooth wave. Perturb and Observe (P&O) method is used for MPPT control of PV system. The simple and fast method to get MPP of PV system with variable irradiation is digital control where the maximum power point is obtained from look-up table for the values of optimum voltage that achieve the maximum power for each irradiance value is used for digital control signal in microcontroller. The output voltage harmonic of multi-level three-phase inverter is controlled using SPWM control.
{"title":"Microcontroller Look-up Table of Digital Control MPPT of PV System","authors":"Mahmoud Aref, Ismaiel Ahmed, V. Oboskalov, A. Mahņitko, Aleksandrs Gavrilovs","doi":"10.1109/RTUCON.2018.8659900","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659900","url":null,"abstract":"This paper is aimed at investigating MPPT of PV system controlled by SPWM which is generated by comparing sinusoidal wave with variable frequency sawtooth wave. Perturb and Observe (P&O) method is used for MPPT control of PV system. The simple and fast method to get MPP of PV system with variable irradiation is digital control where the maximum power point is obtained from look-up table for the values of optimum voltage that achieve the maximum power for each irradiance value is used for digital control signal in microcontroller. The output voltage harmonic of multi-level three-phase inverter is controlled using SPWM control.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115741437","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659823
Edgars Grīnfogels, P. Apse-Apsitis, Armands Senfelds, A. Avotiņš, R. Porins
the aim of research is to explore the methods of electrical power measuring in to non-sinusoidal AC circuits especially Fast Fourier transformations (FFT) based. The FFT method can be used for measuring AC electrical power for any device, signal or system in order to get a more detailed power spectrum and its harmonic division, which would help analyse the work of the electrical equipment or system and optimise the energy used. In comparison to the standard electrical power measuring method there is a small but constant change in the measurements gained, that with high electrical energy consumption could make a significant difference. Investigation of influence of FFT bin precision to mains frequency also was performed. A micro-controller based device was developed in order to perform such tests.
{"title":"Electrical Power Measurement Method Comparison Using Statistical Analysis","authors":"Edgars Grīnfogels, P. Apse-Apsitis, Armands Senfelds, A. Avotiņš, R. Porins","doi":"10.1109/RTUCON.2018.8659823","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659823","url":null,"abstract":"the aim of research is to explore the methods of electrical power measuring in to non-sinusoidal AC circuits especially Fast Fourier transformations (FFT) based. The FFT method can be used for measuring AC electrical power for any device, signal or system in order to get a more detailed power spectrum and its harmonic division, which would help analyse the work of the electrical equipment or system and optimise the energy used. In comparison to the standard electrical power measuring method there is a small but constant change in the measurements gained, that with high electrical energy consumption could make a significant difference. Investigation of influence of FFT bin precision to mains frequency also was performed. A micro-controller based device was developed in order to perform such tests.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125847083","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659907
V. Deshko, A. Zamulko, D. Karpenko, A. Mahnitko, O. Linkevičs
In this paper, the dependence of the district heating system efficiency on the number of heat energy suppliers and the volume value of heat energy consumption is considered. The critical point at which functioning of the heat energy market becomes expedient is determined. The estimation of the introduction possibility of the heat energy market in Eastern European cities is given. Introduction of the district heating market was considered on the example of Latvia (city of Riga), but evaluation of technological and economic efficiency district heating market on the example of Ukraine.
{"title":"Evaluation of the district heating market efficiency as the function of its size and number of competing suppliers","authors":"V. Deshko, A. Zamulko, D. Karpenko, A. Mahnitko, O. Linkevičs","doi":"10.1109/RTUCON.2018.8659907","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659907","url":null,"abstract":"In this paper, the dependence of the district heating system efficiency on the number of heat energy suppliers and the volume value of heat energy consumption is considered. The critical point at which functioning of the heat energy market becomes expedient is determined. The estimation of the introduction possibility of the heat energy market in Eastern European cities is given. Introduction of the district heating market was considered on the example of Latvia (city of Riga), but evaluation of technological and economic efficiency district heating market on the example of Ukraine.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125927824","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659867
D. Rusovs, S. Jaundālders, P. Stanka
The energy consumption of fast growing blockchain mining industy should be considered as opportunity esspecially for renewable sources. Possible limitation of feed-in tariffs for electrical energy exported into the grid often challenge existence of distributed biogeneration. Since, electrical energy cost had crucial influence on feasibility of cryptocurrencies minings, presented paper suggest definition of levelized cost of Bitcoin. However, participation in mining activity request higher efficiency of electrical energy generation. Combined heat and power plants can perform in trigeneration mode and this will enhance total energy performance for mining farms due to reduction of energy consumption for mining rigs cooling.
{"title":"BLOCKCHAIN MINING OF CRYPTOCURRENCIES AS CHALLENGE AND OPPORTUNITY FOR RENEWABLE ENERGY","authors":"D. Rusovs, S. Jaundālders, P. Stanka","doi":"10.1109/RTUCON.2018.8659867","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659867","url":null,"abstract":"The energy consumption of fast growing blockchain mining industy should be considered as opportunity esspecially for renewable sources. Possible limitation of feed-in tariffs for electrical energy exported into the grid often challenge existence of distributed biogeneration. Since, electrical energy cost had crucial influence on feasibility of cryptocurrencies minings, presented paper suggest definition of levelized cost of Bitcoin. However, participation in mining activity request higher efficiency of electrical energy generation. Combined heat and power plants can perform in trigeneration mode and this will enhance total energy performance for mining farms due to reduction of energy consumption for mining rigs cooling.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126168078","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659902
H. Kirkham, M. Albu, M. Engels, G. Frigo, A. Hedayatipour, D. Laverty, A. von Meier, A. Riepmeks, D. White, Z-M Yang
While it has always been true that measurements are made to guide decision-making, there is abundant evidence that not all measurement results are meaningful. We give examples of fully-functional, tested and trusted measurement systems producing nonsensical results. A common characteristic of such systems is they are designed without a clear understanding of the purpose or context of the measurements. To help ensure measurements are designed and used fit for the intended purpose, we propose that, in addition to the appropriate instrumentation, technology, and techniques, all engineering and science students be taught the basics of measurement theory and an overview of measurement infrastructure. We estimate that this can be accomplished in a single semester course. Essential and important elements of the syllabus are considered.
{"title":"Teaching Measurement Fundamentals","authors":"H. Kirkham, M. Albu, M. Engels, G. Frigo, A. Hedayatipour, D. Laverty, A. von Meier, A. Riepmeks, D. White, Z-M Yang","doi":"10.1109/RTUCON.2018.8659902","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659902","url":null,"abstract":"While it has always been true that measurements are made to guide decision-making, there is abundant evidence that not all measurement results are meaningful. We give examples of fully-functional, tested and trusted measurement systems producing nonsensical results. A common characteristic of such systems is they are designed without a clear understanding of the purpose or context of the measurements. To help ensure measurements are designed and used fit for the intended purpose, we propose that, in addition to the appropriate instrumentation, technology, and techniques, all engineering and science students be taught the basics of measurement theory and an overview of measurement infrastructure. We estimate that this can be accomplished in a single semester course. Essential and important elements of the syllabus are considered.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129574646","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659817
B. Pakhaliuk, O. Husev, R. Strzelecki, Kostiantyn Tytelmaier, J. Zakis, D. Stepins
This paper describes Z-source based inductive power transfer topologies control approaches. The goal of this work is a multi-variable control approach which involves a constant voltage / constant current control along with an optimal frequency control to obtain maximum efficiency. This control is applied to the wireless power transfer system based on a modified Z-source topology. The description of the control method along with simulation results is provided.
{"title":"Optimal Multivariable Control for Modified Z-source Based IPT","authors":"B. Pakhaliuk, O. Husev, R. Strzelecki, Kostiantyn Tytelmaier, J. Zakis, D. Stepins","doi":"10.1109/RTUCON.2018.8659817","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659817","url":null,"abstract":"This paper describes Z-source based inductive power transfer topologies control approaches. The goal of this work is a multi-variable control approach which involves a constant voltage / constant current control along with an optimal frequency control to obtain maximum efficiency. This control is applied to the wireless power transfer system based on a modified Z-source topology. The description of the control method along with simulation results is provided.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133471994","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659860
Pavel Y. Bannykh, S. Lozhkin, N. Mukhlynin, A. Pazderin, Olga Malozemova
Distribution grid analysis is based on distribution network power flow calculation. New power flow algorithm for distribution network is developed. Due to specific features of modern distribution networks, traditional approaches do not adopted for them. Particularly there is a problem with accelerating calculation in network with high R/X ratio. The proposed method allows overcoming these disadvantages. In this method, there are possibility for reducing calculation complexity. The key idea of this method is based on power-energy flow model. The algorithm was tested on different test feeder and system. Results are compared with traditional algorithms. Conditioning and converges of nonlinear equations are analyzed.
{"title":"Distribution Grid Power Flow Algorithm Based On Power-Energy Flow Model","authors":"Pavel Y. Bannykh, S. Lozhkin, N. Mukhlynin, A. Pazderin, Olga Malozemova","doi":"10.1109/RTUCON.2018.8659860","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659860","url":null,"abstract":"Distribution grid analysis is based on distribution network power flow calculation. New power flow algorithm for distribution network is developed. Due to specific features of modern distribution networks, traditional approaches do not adopted for them. Particularly there is a problem with accelerating calculation in network with high R/X ratio. The proposed method allows overcoming these disadvantages. In this method, there are possibility for reducing calculation complexity. The key idea of this method is based on power-energy flow model. The algorithm was tested on different test feeder and system. Results are compared with traditional algorithms. Conditioning and converges of nonlinear equations are analyzed.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115225454","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659808
Rafika EL Idrissi, A. Abbou, M. Salimi
This paper investigates a comparative analysis of control methods to achieve an optimal photovoltaic (PV) module output voltage and to track the maximum power point (MPP) of the PV system under variable conditions such as temperature, solar irradiance, and load changes, with the help of an offline trained actificial neural (ANN) network. The trained ANN provides the reference voltage corresponding to the MPP for the feed-forward loop which is responsible for regulation of the solar cell array voltage in MPP. The PV system consists of a solar module and a boost DC/DC converter connected to a DC motor which feeds a centrifugal pump for water pumping. Depending on the voltage error signal, the controllers generate a control signal for the pulse-width modulation (PWM) generator which in turn adjusts the duty cycle of the converter. For this purpose first, the proportional-integral (PI) controller is used. Next controllers are based on backstepping approach and the backstepping with integral action. Different simulation tests using Maltab/Simulink environment are given to demonstrate the efficiency of the controllers in presence of the irradiance perturbations.
{"title":"Artificial Neural-Network-Based Maximum Power Point Tracking for Photovoltaic Pumping System Using Backstepping Controller","authors":"Rafika EL Idrissi, A. Abbou, M. Salimi","doi":"10.1109/RTUCON.2018.8659808","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659808","url":null,"abstract":"This paper investigates a comparative analysis of control methods to achieve an optimal photovoltaic (PV) module output voltage and to track the maximum power point (MPP) of the PV system under variable conditions such as temperature, solar irradiance, and load changes, with the help of an offline trained actificial neural (ANN) network. The trained ANN provides the reference voltage corresponding to the MPP for the feed-forward loop which is responsible for regulation of the solar cell array voltage in MPP. The PV system consists of a solar module and a boost DC/DC converter connected to a DC motor which feeds a centrifugal pump for water pumping. Depending on the voltage error signal, the controllers generate a control signal for the pulse-width modulation (PWM) generator which in turn adjusts the duty cycle of the converter. For this purpose first, the proportional-integral (PI) controller is used. Next controllers are based on backstepping approach and the backstepping with integral action. Different simulation tests using Maltab/Simulink environment are given to demonstrate the efficiency of the controllers in presence of the irradiance perturbations.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115407770","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659838
A. Egorov, S. Eroshenko, A. Khalyasmaa, K. Zinovyev
The determination short-circuit currents values at any point in the electric power system is an important design and operational task. Calculations of short-circuit currents are performed based on regulatory documents. The actual values of short-circuit currents are defined by means of emergency event recorders. However, there is no comparative analysis of the short-circuit current levels to compare calculated and actual values in the practice of electrical power systems (EPS) operation. So, when selecting and testing the switching equipment and live parts of switchgears, it is required to check the equipment for dynamic stability and thermal heating. The short-circuit currents in EPS are constantly increasing which leads to the necessity to replace switching devices and live parts. The financial possibilities of electric grid companies are limited which requires a correct prioritizing related to the timely replacement of equipment at substations. Today, it became possible to identify a statistical regularity between calculated and actual values of short-circuit currents.
{"title":"Research on short-circuit current levels in Sverdlovsk power system","authors":"A. Egorov, S. Eroshenko, A. Khalyasmaa, K. Zinovyev","doi":"10.1109/RTUCON.2018.8659838","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659838","url":null,"abstract":"The determination short-circuit currents values at any point in the electric power system is an important design and operational task. Calculations of short-circuit currents are performed based on regulatory documents. The actual values of short-circuit currents are defined by means of emergency event recorders. However, there is no comparative analysis of the short-circuit current levels to compare calculated and actual values in the practice of electrical power systems (EPS) operation. So, when selecting and testing the switching equipment and live parts of switchgears, it is required to check the equipment for dynamic stability and thermal heating. The short-circuit currents in EPS are constantly increasing which leads to the necessity to replace switching devices and live parts. The financial possibilities of electric grid companies are limited which requires a correct prioritizing related to the timely replacement of equipment at substations. Today, it became possible to identify a statistical regularity between calculated and actual values of short-circuit currents.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124581358","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 : 2018-11-01DOI: 10.1109/RTUCON.2018.8659891
J. Kozadajevs, A. Dolgicers, Dmitrijs Boreiko Ivars Zalitis
The present article describes the experience amassed in the operation of smart electric thermal storage (SETS) heaters within the RealValue project. The task of the project was to evaluate the possible benefits from centralised use of SETS by using the electricity market prices. This paper pays special attention to the operation of SETS at substations where there is no staff and a temperature of not less than 15 °C needs to be maintained. Also, there is a recommendation and calculations regarding the possibility of using storage devices for minimizing the heating costs for power substations.
{"title":"Heat consumption modelling and optimisation for power substations","authors":"J. Kozadajevs, A. Dolgicers, Dmitrijs Boreiko Ivars Zalitis","doi":"10.1109/RTUCON.2018.8659891","DOIUrl":"https://doi.org/10.1109/RTUCON.2018.8659891","url":null,"abstract":"The present article describes the experience amassed in the operation of smart electric thermal storage (SETS) heaters within the RealValue project. The task of the project was to evaluate the possible benefits from centralised use of SETS by using the electricity market prices. This paper pays special attention to the operation of SETS at substations where there is no staff and a temperature of not less than 15 °C needs to be maintained. Also, there is a recommendation and calculations regarding the possibility of using storage devices for minimizing the heating costs for power substations.","PeriodicalId":192943,"journal":{"name":"2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114396614","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：