Pub Date : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.10
M. Tirsu, M. Balan, V. Popescu, Igor Kurdov, T. Balan, V. Rotari
The aim of this work is to improve the efficiency of the dehydration process of seeds of agricultural plants by applying the fluidized bed treatment method. In order to achieve the aim of the work, an experimental plant for the dehydration of seeds in fluidized layer was developed, based on which the research was carried out. Convection and SHF were used as sources of fluidized bed seed treatment. The efficiency of the dehydration process with the application of the developed experimental plant was estimated for 3 types of seeds of agricultural alleaginous plants: grape seeds, flax seeds and white buckthorn seeds. These types of seeds were selected for research because at present their dehydration is a problem and they have a great potential for the food industry, traditional medicine, cosmetic industry, pharmaceutical industry, etc. The main results obtained in the application of the developed plant to the treatment of seeds of agricultural plants in a fluidized layer are: increase of the dehydration process speed, reduction of the treatment time, reduction of electricity consumption, increase of the seed quality and reduction of the processing costs. Again, the plant is simple in terms of construction, easy to use, low in cost and during operation has demonstrated a high level of operational safety. The significance of the results obtained lies in the efficiency of the process of dehydration of oilseeds of agricultural plants, based on fluidized bed treatment, mainly with a reduction in the cost of technological processing and an increase in the quality of these seeds, for subsequent use in the food industry, traditional medicine, cosmetics industry, pharmaceutical industry, etc.
{"title":"Fluidized Bed Seed Dewatering System","authors":"M. Tirsu, M. Balan, V. Popescu, Igor Kurdov, T. Balan, V. Rotari","doi":"10.52254/1857-0070.2022.2-54.10","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.10","url":null,"abstract":"The aim of this work is to improve the efficiency of the dehydration process of seeds of agricultural plants by applying the fluidized bed treatment method. In order to achieve the aim of the work, an experimental plant for the dehydration of seeds in fluidized layer was developed, based on which the research was carried out. Convection and SHF were used as sources of fluidized bed seed treatment. The efficiency of the dehydration process with the application of the developed experimental plant was estimated for 3 types of seeds of agricultural alleaginous plants: grape seeds, flax seeds and white buckthorn seeds. These types of seeds were selected for research because at present their dehydration is a problem and they have a great potential for the food industry, traditional medicine, cosmetic industry, pharmaceutical industry, etc. The main results obtained in the application of the developed plant to the treatment of seeds of agricultural plants in a fluidized layer are: increase of the dehydration process speed, reduction of the treatment time, reduction of electricity consumption, increase of the seed quality and reduction of the processing costs. Again, the plant is simple in terms of construction, easy to use, low in cost and during operation has demonstrated a high level of operational safety. The significance of the results obtained lies in the efficiency of the process of dehydration of oilseeds of agricultural plants, based on fluidized bed treatment, mainly with a reduction in the cost of technological processing and an increase in the quality of these seeds, for subsequent use in the food industry, traditional medicine, cosmetics industry, pharmaceutical industry, etc.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44333758","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.09
Elizabeth Chernysh, V. Shtepa, D. Danilov, L. Plyatsuk, Victoria Chubur
The aim of the work was to study the effect of electrolysis on the process of anaerobic digestion in the example of poultry manure with an inoculum of activated sludge from a municipal wastewater treatment plant. The set aim was achieved by solving the following tasks: microcopiing of anaerobic activated sludge during the digestion of poultry manure under the influence of electrolysis treatment; studying the dynamics of biogas yield and its component composition under electrolysis treatment; studying the change in pH values and redox potential (ORP) in experiments with a combination of a bioreactor with electrolysis treatment and without treatment. Evaluation of the effect of stimulating the metabolic activity of microorganisms during treatment in the bioreactor-electrolyser was the most significant result. In addition, improved biodegradability of complex organic components of poultry manure was substantiated. Thus, methane yield on the 28th day was 640.5 ml from the total volume of 1525 ml of biogas, and under conventional conditions, methane yield was 33.4 ml from 50 ml of total volume. The decrease of H2S content in biogas under the influence of electrolysis was determined. A low ORP value of - 495 mV was achieved in the control experiment (without electrolysis treatment). ORP gradually increased in the bioreactor-electrolyser at all stages of digestion and reached -53 mV on day 28. pH stabilized at a neutral level. The positive effect of combining anaerobic digestion with electrolysis on the intensification of biogas production with a large volume of methane has been experimentally confirmed.
{"title":"Anaerobic Digestion Combined with Electrolysis of Poultry Manure and Activated Sludge Inoculum","authors":"Elizabeth Chernysh, V. Shtepa, D. Danilov, L. Plyatsuk, Victoria Chubur","doi":"10.52254/1857-0070.2022.2-54.09","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.09","url":null,"abstract":"The aim of the work was to study the effect of electrolysis on the process of anaerobic digestion in the example of poultry manure with an inoculum of activated sludge from a municipal wastewater treatment plant. The set aim was achieved by solving the following tasks: microcopiing of anaerobic activated sludge during the digestion of poultry manure under the influence of electrolysis treatment; studying the dynamics of biogas yield and its component composition under electrolysis treatment; studying the change in pH values and redox potential (ORP) in experiments with a combination of a bioreactor with electrolysis treatment and without treatment. Evaluation of the effect of stimulating the metabolic activity of microorganisms during treatment in the bioreactor-electrolyser was the most significant result. In addition, improved biodegradability of complex organic components of poultry manure was substantiated. Thus, methane yield on the 28th day was 640.5 ml from the total volume of 1525 ml of biogas, and under conventional conditions, methane yield was 33.4 ml from 50 ml of total volume. The decrease of H2S content in biogas under the influence of electrolysis was determined. A low ORP value of - 495 mV was achieved in the control experiment (without electrolysis treatment). ORP gradually increased in the bioreactor-electrolyser at all stages of digestion and reached -53 mV on day 28. pH stabilized at a neutral level. The positive effect of combining anaerobic digestion with electrolysis on the intensification of biogas production with a large volume of methane has been experimentally confirmed.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48185644","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.07
Mihail Shit, A. Zhuravlev, Dmitry M. Timchenko
The work is devoted to control systems for hybrid heat pumps using the heat of return network water and outside air, designed to operate in district heating systems based on CHPP. The aim of the research is to develop control systems for heat pump operating on qualitative, quantitative and quantitative-qualitative heat schedules. The set goal is achieved by introducing two controlled heat exchangers: one of "refrigerant-water" type, installed after the evaporator and "refrigerant-air" type, installed after the gas cooler. The most important results are the hydraulic scheme of the heat pump, the control system scheme of gas superheater installed after the evaporator and gas supercooler installed after the gas cooler. The significance of the obtained results consists in obtaining a technical solution, which ensures the operation of the heat pump at different heating schedules. Equations of heat pump apparatuses have been obtained, in which the influence of flow rate and temperature of the working body on the heat pump operating mode is emphasized. The obtained heat balance equations allowed obtaining structures of automatic control systems for heat exchange apparatuses, compressors and controlling valves of the hybrid heat pump. The developed scheme of the heat pump air duct allowed using a minimum of heat of return network water in the heat pump. It has been established that the scheme of this automatic control system should include a functional converter linking the temperature of the outside air and the coordinates of the working body state at the outlet of the gas subcooler.
{"title":"Automatic Control of the Hybrid Heat Pump for Heating of Multi-Storey Buildings","authors":"Mihail Shit, A. Zhuravlev, Dmitry M. Timchenko","doi":"10.52254/1857-0070.2022.2-54.07","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.07","url":null,"abstract":"The work is devoted to control systems for hybrid heat pumps using the heat of return network water and outside air, designed to operate in district heating systems based on CHPP. The aim of the research is to develop control systems for heat pump operating on qualitative, quantitative and quantitative-qualitative heat schedules. The set goal is achieved by introducing two controlled heat exchangers: one of \"refrigerant-water\" type, installed after the evaporator and \"refrigerant-air\" type, installed after the gas cooler. The most important results are the hydraulic scheme of the heat pump, the control system scheme of gas superheater installed after the evaporator and gas supercooler installed after the gas cooler. The significance of the obtained results consists in obtaining a technical solution, which ensures the operation of the heat pump at different heating schedules. Equations of heat pump apparatuses have been obtained, in which the influence of flow rate and temperature of the working body on the heat pump operating mode is emphasized. The obtained heat balance equations allowed obtaining structures of automatic control systems for heat exchange apparatuses, compressors and controlling valves of the hybrid heat pump. The developed scheme of the heat pump air duct allowed using a minimum of heat of return network water in the heat pump. It has been established that the scheme of this automatic control system should include a functional converter linking the temperature of the outside air and the coordinates of the working body state at the outlet of the gas subcooler.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48010784","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.06
M. Lupu, D. Zaitsev, Mihail Tyrshu, I. Golub
The paper aim was to study the normal functioning modes of consumers power supply by the distribution network, taking into account the electricity production using wind turbines, as well as to develop recommendations that allow optimizing power consumption modes. The goal was achieved by analyzing the initial information on the network section topology, the technical characteristics of linear and transformer equipment, as well as consumption and generation profiles. The most significant result of the paper was the determination of the fact that the connection of wind turbines according to the “install and forget” principle without prior justification of both connection place and wind turbine capacity often leads to significant change in the operating characteristics and additional technical losses of active power. In this case, the main part of the losses falls on power lines. The significance of the obtained results lies in the fact that the main problems, associated with the coordination of the operating modes of distributed generation facilities and load, were identified and possible technical solutions were proposed to improve the situation. Based on the obtained results it is possible to conclude that when connecting a wind turbine to a distribution network, it is necessary to take into account both the capacity and the installation location of the equipment, which significantly change the values of the operating parameters of electrical networks. It has been shown that use of energy storage devices, as well as the network reconstruction, can make it possible to minimize active power losses and carry out balance of regimes.
{"title":"Influence of Wind Turbines on the Operating Modes of the Distribution Network","authors":"M. Lupu, D. Zaitsev, Mihail Tyrshu, I. Golub","doi":"10.52254/1857-0070.2022.2-54.06","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.06","url":null,"abstract":"The paper aim was to study the normal functioning modes of consumers power supply by the distribution network, taking into account the electricity production using wind turbines, as well as to develop recommendations that allow optimizing power consumption modes. The goal was achieved by analyzing the initial information on the network section topology, the technical characteristics of linear and transformer equipment, as well as consumption and generation profiles. The most significant result of the paper was the determination of the fact that the connection of wind turbines according to the “install and forget” principle without prior justification of both connection place and wind turbine capacity often leads to significant change in the operating characteristics and additional technical losses of active power. In this case, the main part of the losses falls on power lines. The significance of the obtained results lies in the fact that the main problems, associated with the coordination of the operating modes of distributed generation facilities and load, were identified and possible technical solutions were proposed to improve the situation. Based on the obtained results it is possible to conclude that when connecting a wind turbine to a distribution network, it is necessary to take into account both the capacity and the installation location of the equipment, which significantly change the values of the operating parameters of electrical networks. It has been shown that use of energy storage devices, as well as the network reconstruction, can make it possible to minimize active power losses and carry out balance of regimes.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46851639","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.01
Vladimir Kozlov, O. Kurakina
During operation, resulting from the thermochemical and electrical effects, the performance of the transformer oil decreases due to the measurement of the structural group composition. An increase in the content of the aromatic hydrocarbons leads to the appearance of a precipitate, and as well as due to its hygroscopicity, an increase in the moisture content. The latter is one of the transformer oil parameters that determines its quality. In power equipment, the presence of moisture of the order of 10 grams of water per ton of oil is allowed. At elevated water concentrations, there is a risk of the power transformers’ failure. The aim of the work was to develop new methods for determining the aromatic compounds and water contents in the transformer oil in small quantities. This goal was achieved by conducting spectral studies of the transformer oil samples in the UV range and constructing correlation lines to determine the moisture content and concentration of aromatic compounds. The most significant result of the article was the establishment of correlations between the optical density of the transformer oil in the region of 530 nm and the concentration of aromatic compounds and between the optical density in the region of 980 nm and moisture content in the oil. The significance of the obtained results lies in the fact that the optical method for determining the moisture content and aromatic hydrocarbons in transformer oils, using the constructed correlation lines, is highly accurate and does not require the use of additional reagents and complex calculations.
{"title":"Moisture Content and Aromatic Compounds Determination in Transformer Oil Using Spectral Method","authors":"Vladimir Kozlov, O. Kurakina","doi":"10.52254/1857-0070.2022.2-54.01","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.01","url":null,"abstract":"During operation, resulting from the thermochemical and electrical effects, the performance of the transformer oil decreases due to the measurement of the structural group composition. An increase in the content of the aromatic hydrocarbons leads to the appearance of a precipitate, and as well as due to its hygroscopicity, an increase in the moisture content. The latter is one of the transformer oil parameters that determines its quality. In power equipment, the presence of moisture of the order of 10 grams of water per ton of oil is allowed. At elevated water concentrations, there is a risk of the power transformers’ failure. The aim of the work was to develop new methods for determining the aromatic compounds and water contents in the transformer oil in small quantities. This goal was achieved by conducting spectral studies of the transformer oil samples in the UV range and constructing correlation lines to determine the moisture content and concentration of aromatic compounds. The most significant result of the article was the establishment of correlations between the optical density of the transformer oil in the region of 530 nm and the concentration of aromatic compounds and between the optical density in the region of 980 nm and moisture content in the oil. The significance of the obtained results lies in the fact that the optical method for determining the moisture content and aromatic hydrocarbons in transformer oils, using the constructed correlation lines, is highly accurate and does not require the use of additional reagents and complex calculations.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45886838","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.02
O. Burdo, S. Terziev, V. Mordynsky, Ilya Sirotyuk, Yana Fateeva, Mikhail Molchanov
This work is devoted to the fresh water deficit analysis. The importance of the research concerning water treatment is emphasized. A comparative analysis of water demineralization traditional methods is given and prospects for low-temperature desalination methods are shown. The increase in the world interest to the research of the block freezing innovative technologies was established, the priority in which belongs to the authors of this work. The aim of the work is to improve the block freezing devices during their transferring to a continuous operation mode. Achievement of this aim lies in a proposed universal design of the apparatus, in which the processes of crystallization, separation and melting of ice are sequentially implemented. A module for a continuous seawater desalination facility was developed. The energy and operational advantages of the proposed method were described. The system modeling of this equipment was carried out. The target function of the modeling determined the key parameters of the process of the ice block gravitational separation — energy and salinity. It was proposed to correct the traditional calculation principles for the outflow in channels by the “capillary drag” coefficient, which takes into account the relief surface of the ice capillaries. A technique for the engineering calculation of ice block salinity during separation was offered. The most significant result of the work lied in the fact of possibility to transfer the block freezing facilities to the continuous mode of sea water desalination with guaranteed salinity indicators. The significance of the work was that an energy-efficient freezing facility with ice recycling for the sea water demineralization in the flow was created.
{"title":"Development of Low-Temperature Block Type Facility for Sea Water Desalination","authors":"O. Burdo, S. Terziev, V. Mordynsky, Ilya Sirotyuk, Yana Fateeva, Mikhail Molchanov","doi":"10.52254/1857-0070.2022.2-54.02","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.02","url":null,"abstract":"This work is devoted to the fresh water deficit analysis. The importance of the research concerning water treatment is emphasized. A comparative analysis of water demineralization traditional methods is given and prospects for low-temperature desalination methods are shown. The increase in the world interest to the research of the block freezing innovative technologies was established, the priority in which belongs to the authors of this work. The aim of the work is to improve the block freezing devices during their transferring to a continuous operation mode. Achievement of this aim lies in a proposed universal design of the apparatus, in which the processes of crystallization, separation and melting of ice are sequentially implemented. A module for a continuous seawater desalination facility was developed. The energy and operational advantages of the proposed method were described. The system modeling of this equipment was carried out. The target function of the modeling determined the key parameters of the process of the ice block gravitational separation — energy and salinity. It was proposed to correct the traditional calculation principles for the outflow in channels by the “capillary drag” coefficient, which takes into account the relief surface of the ice capillaries. A technique for the engineering calculation of ice block salinity during separation was offered. The most significant result of the work lied in the fact of possibility to transfer the block freezing facilities to the continuous mode of sea water desalination with guaranteed salinity indicators. The significance of the work was that an energy-efficient freezing facility with ice recycling for the sea water demineralization in the flow was created.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41643050","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.04
A. Stopakevich, A. Stopakevich
This paper is devoted to the development of a decentralized control system design method with improved robustness, applicable to distillation columns control problem. The aim is attained by solving the following tasks: selection of representative models of columns; development of an effective transfer function identification algorithm; development of a decentralized controller design algorithm, which takes into account the cross-links impact; verification of the developed method for the selected models of columns. The most important result is the developed design method, which includes two algorithms. The first algorithm can be used to identify simplified models of the effective transfer functions. The second algorithm makes it possible to design a decentralized control system based on the ratio between the diagonals of the original model and effective transfer functions. Modified PI controller is used. The achievement of the distillation column control system robustness to the synchronous technologically conditioned deviation of the model parameters by up to three hundred percent of the nominal value is the paper significant result. The digital implementation of the designed controllers is simple. The analysis of the literature shows that none of the previously proposed methods for designing decentralized automatic control systems solved such a problem. The efficiency of the developed algorithms is illustrated using the known models of dynamics of distillation columns. The analysis of limitations of the method as well as its significant differences to the Biggest Log Tuning and H∞ loop shaping methods is presented.
{"title":"Design of Robust Decentralized Control Systems for Distillation Columns","authors":"A. Stopakevich, A. Stopakevich","doi":"10.52254/1857-0070.2022.2-54.04","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.04","url":null,"abstract":"This paper is devoted to the development of a decentralized control system design method with improved robustness, applicable to distillation columns control problem. The aim is attained by solving the following tasks: selection of representative models of columns; development of an effective transfer function identification algorithm; development of a decentralized controller design algorithm, which takes into account the cross-links impact; verification of the developed method for the selected models of columns. The most important result is the developed design method, which includes two algorithms. The first algorithm can be used to identify simplified models of the effective transfer functions. The second algorithm makes it possible to design a decentralized control system based on the ratio between the diagonals of the original model and effective transfer functions. Modified PI controller is used. The achievement of the distillation column control system robustness to the synchronous technologically conditioned deviation of the model parameters by up to three hundred percent of the nominal value is the paper significant result. The digital implementation of the designed controllers is simple. The analysis of the literature shows that none of the previously proposed methods for designing decentralized automatic control systems solved such a problem. The efficiency of the developed algorithms is illustrated using the known models of dynamics of distillation columns. The analysis of limitations of the method as well as its significant differences to the Biggest Log Tuning and H∞ loop shaping methods is presented.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45760353","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 : 2022-05-01DOI: 10.52254/1857-0070.2022.2-54.03
P. Matrenin, Anna Arrestova, D. Antonenkov
Forecasting electricity tariff rates is necessary for large suppliers, consumers, and power brokers working in the wholesale markets. Meanwhile, tariff rates of the retail market are also hourly changed for certain groups of electricity consumers. It creates more efficient electrical load regulation opportunities than the traditional load leveling approach. Power facilities that include controlled load consumers or local generation can use their capabilities by adjusting the load curve according to tariff rates. This work aims to study the potential for medium-term forecasting of retail electricity tariff rates and develop a predictive machine learning model. Hourly data on the retail market tariffs of the Novosibirsk region (Siberia) for four years were collected, several machine learning models were applied, and an analysis of the input parameters for forecasting was carried out. The most significant results are the proof of the possibility of obtaining the month ahead electricity tariff rate forecast with the mean absolute percentage error 4 %. It could be used for electricity costs reduction by regulating the load curve. It was shown that the discrete models based on ensembles of logical rules give higher accuracy than models based on continuous and piecewise continuous functions, such as neural networks. The significance of the obtained results is the proposed approach for month ahead electricity tariff rates forecasting, which was verified on a four-year dataset with an error of 4 %. The approach is based on open data and open-source machine learning models, which allow specialists with even a basic level of data science skills to put it into practice.
{"title":"Medium-Term Hourly Electricity Tariff Forecasting Using Ensemble Models","authors":"P. Matrenin, Anna Arrestova, D. Antonenkov","doi":"10.52254/1857-0070.2022.2-54.03","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.2-54.03","url":null,"abstract":"Forecasting electricity tariff rates is necessary for large suppliers, consumers, and power brokers working in the wholesale markets. Meanwhile, tariff rates of the retail market are also hourly changed for certain groups of electricity consumers. It creates more efficient electrical load regulation opportunities than the traditional load leveling approach. Power facilities that include controlled load consumers or local generation can use their capabilities by adjusting the load curve according to tariff rates. This work aims to study the potential for medium-term forecasting of retail electricity tariff rates and develop a predictive machine learning model. Hourly data on the retail market tariffs of the Novosibirsk region (Siberia) for four years were collected, several machine learning models were applied, and an analysis of the input parameters for forecasting was carried out. The most significant results are the proof of the possibility of obtaining the month ahead electricity tariff rate forecast with the mean absolute percentage error 4 %. It could be used for electricity costs reduction by regulating the load curve. It was shown that the discrete models based on ensembles of logical rules give higher accuracy than models based on continuous and piecewise continuous functions, such as neural networks. The significance of the obtained results is the proposed approach for month ahead electricity tariff rates forecasting, which was verified on a four-year dataset with an error of 4 %. The approach is based on open data and open-source machine learning models, which allow specialists with even a basic level of data science skills to put it into practice.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48431599","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 : 2022-02-01DOI: 10.52254/1857-0070.2022.1-53.11
T. Beloglazova, T. Romanova
The work is devoted to improving the processes of digital technologies introduction in the field of the gas supply system on a methodological basis to enhance efficiency and reliability. The goal set in the study is to increase the reliability of the gas supply system of facilities based on the practical effectiveness of the digital technologies. This aim is achieved by solving the following tasks. Improving the methodology for assessing digital transformation in the field of gas supply. Application of the method of system analysis for the research, generalization of existing mathematical models and digital technologies. Identification of the modules of the main tasks for the implementation of an integrated method for improving the reliability of the gas supply system. The question of the criterion evaluation of the achievement of digitalization indicators is considered. So at the present stage, the digital technologies have already been introduced into the field of the gas supply, but the concepts of the basic level are not methodically defined. The most significant result is the improvement of the practical methodology for assessing digital transformation for the gas supply. A study of the current level of activity of gas distribution organizations shows a nonuniform level of the digital indicators for consumers and industrial facilities. The effectiveness of digital technologies is assessed taking into account the volume of gas consumption. The effect on economy, manufacturability and safety performance was made according to expert estimates and on the statistical data basis. The results of a multi-level modular-functional approach in estimation the digitalization of the effect were presented for the basic economically justified and promising level of the gas-supply digital transformation.
{"title":"Effective Implementation of Digital Technologies in the Field of Gas Supply","authors":"T. Beloglazova, T. Romanova","doi":"10.52254/1857-0070.2022.1-53.11","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.1-53.11","url":null,"abstract":"The work is devoted to improving the processes of digital technologies introduction in the field of the gas supply system on a methodological basis to enhance efficiency and reliability. The goal set in the study is to increase the reliability of the gas supply system of facilities based on the practical effectiveness of the digital technologies. This aim is achieved by solving the following tasks. Improving the methodology for assessing digital transformation in the field of gas supply. Application of the method of system analysis for the research, generalization of existing mathematical models and digital technologies. Identification of the modules of the main tasks for the implementation of an integrated method for improving the reliability of the gas supply system. The question of the criterion evaluation of the achievement of digitalization indicators is considered. So at the present stage, the digital technologies have already been introduced into the field of the gas supply, but the concepts of the basic level are not methodically defined. The most significant result is the improvement of the practical methodology for assessing digital transformation for the gas supply. A study of the current level of activity of gas distribution organizations shows a nonuniform level of the digital indicators for consumers and industrial facilities. The effectiveness of digital technologies is assessed taking into account the volume of gas consumption. The effect on economy, manufacturability and safety performance was made according to expert estimates and on the statistical data basis. The results of a multi-level modular-functional approach in estimation the digitalization of the effect were presented for the basic economically justified and promising level of the gas-supply digital transformation.","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48599141","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 : 2022-02-01DOI: 10.52254/1857-0070.2022.1-53.09
A. Kobozeva, I. Bobok, N. Kushnirenko
Nowadays, the energy systems are considered to be the main vital factor for the functioning of society. Today, this part of the infrastructure cannot exist without the informative infrastructure, so it needs efficient information and cyber protection. To detect the data integrity violations is one of the main tasks in the field of information security. In the paper, the digital images are considered as information content. The image integrity violation often results in the change of the original storage format. The format change is an indicator of the image transformation. At the same time, this fact can be considered as an indirect indicator of its integrity violation. The effective method for distinguishing the original image in lossless format from the image re-saved to lossless format from lossy format is developed in the current work. The proposed method is an improvement of the method developed by the authors earlier. The method is based on the analysis of the number of non-intersecting image blocks, in which the normalized gap of maximum singular value increases due to the image's re-saving into a lossy format. The algorithmic implementation of the improved method allowed us to reduce the examination time in 38-56 times for more than 50% of images originally stored in lossy format compared to the prototype method. The algorithm efficiency was evaluated using Type I and Type II errors, as well as applying the accuracy coefficient (ACC). As a result of testing, Type I error was not detected, Type II error rate was 3.6%, ACC = 0.98. The obtained estimations are independent of the quality factor used when the image was initially saved in a lossy format. The developed algorithm is more efficient than almost all modern analogues, except for the prototype one. The theoretical basis of the proposed improved method makes it possible to use it for the study of the digital image integrity, violated by a minor disturbance, in particular for steganalysis in conditions of low capacity of the hidden communication channel
{"title":"Method for Distinguishing the Digital Images in Different Formats","authors":"A. Kobozeva, I. Bobok, N. Kushnirenko","doi":"10.52254/1857-0070.2022.1-53.09","DOIUrl":"https://doi.org/10.52254/1857-0070.2022.1-53.09","url":null,"abstract":"Nowadays, the energy systems are considered to be the main vital factor for the functioning of society. Today, this part of the infrastructure cannot exist without the informative infrastructure, so it needs efficient information and cyber protection. To detect the data integrity violations is one of the main tasks in the field of information security. In the paper, the digital images are considered as information content. The image integrity violation often results in the change of the original storage format. The format change is an indicator of the image transformation. At the same time, this fact can be considered as an indirect indicator of its integrity violation. The effective method for distinguishing the original image in lossless format from the image re-saved to lossless format from lossy format is developed in the current work. The proposed method is an improvement of the method developed by the authors earlier. The method is based on the analysis of the number of non-intersecting image blocks, in which the normalized gap of maximum singular value increases due to the image's re-saving into a lossy format. The algorithmic implementation of the improved method allowed us to reduce the examination time in 38-56 times for more than 50% of images originally stored in lossy format compared to the prototype method. The algorithm efficiency was evaluated using Type I and Type II errors, as well as applying the accuracy coefficient (ACC). As a result of testing, Type I error was not detected, Type II error rate was 3.6%, ACC = 0.98. The obtained estimations are independent of the quality factor used when the image was initially saved in a lossy format. The developed algorithm is more efficient than almost all modern analogues, except for the prototype one. The theoretical basis of the proposed improved method makes it possible to use it for the study of the digital image integrity, violated by a minor disturbance, in particular for steganalysis in conditions of low capacity of the hidden communication channel","PeriodicalId":41974,"journal":{"name":"Problemele Energeticii Regionale","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48005649","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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