Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998214
I. Galkin, M. Vorobyov
Global energy market reveal the necessity of the use of renewable energy sources which requires an interface converter if their energy has to be passed into the grid. The operation of the interface converters depends on the operation of their synchronisation unit. Low power sources need simpler and cheaper control systems. This paper shows an example of simple implementation of the grid synchronization module based on an MSP430 microcontroller. This example follows from a complete PLL system, finally giving simplified, operating system. The obtained preliminary results confirm the operation of the propose synchronizer, but show the necessity of its further improvement.
{"title":"Implementation of single-phase grid synchronization module with low-end microcontrollers","authors":"I. Galkin, M. Vorobyov","doi":"10.1109/RTUCON.2014.6998214","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998214","url":null,"abstract":"Global energy market reveal the necessity of the use of renewable energy sources which requires an interface converter if their energy has to be passed into the grid. The operation of the interface converters depends on the operation of their synchronisation unit. Low power sources need simpler and cheaper control systems. This paper shows an example of simple implementation of the grid synchronization module based on an MSP430 microcontroller. This example follows from a complete PLL system, finally giving simplified, operating system. The obtained preliminary results confirm the operation of the propose synchronizer, but show the necessity of its further improvement.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122660450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998179
Aigars Vītols, I. Rankis
This paper presents a methodology to find optimal height for pipe of special pipe and micro generator system - SPMS for harvesting electrical energy from potential energy of precipitations in form of rain. Theoretical calculations in order to obtain theoretical amount of energy for two-storey house in western slope of Vidzeme upland of Latvia are presented as well as calculations to obtain real amount of obtainable energy based on experimental data are presented. Virtual model of SPMS developed according experimental data in simulation program Lab VIEW 7.1 is described.
{"title":"Harvesting electrical energy from rain by SPMS - Special pipe and micro-generator system","authors":"Aigars Vītols, I. Rankis","doi":"10.1109/RTUCON.2014.6998179","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998179","url":null,"abstract":"This paper presents a methodology to find optimal height for pipe of special pipe and micro generator system - SPMS for harvesting electrical energy from potential energy of precipitations in form of rain. Theoretical calculations in order to obtain theoretical amount of energy for two-storey house in western slope of Vidzeme upland of Latvia are presented as well as calculations to obtain real amount of obtainable energy based on experimental data are presented. Virtual model of SPMS developed according experimental data in simulation program Lab VIEW 7.1 is described.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127704057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998202
Jiangtao Quan, Q. Guo, Ling Ruan, Ruiji Yu, Y. Luo, Zhicheng Wang, Fanrong Wei, Jinwen Sun, Xiangning Lin
The occurrence of DC Bias will affect the normal operation of power transformer, thus DC bias withstand capability of transformer is a prerequisite for stable operation of power system. In this paper, the DC current distribution model of transformer neutral point in Yichang area is established. Meanwhile, according to the transformer noise limit, the maximum current which is allowable to flow through transformer neutral point is determined. On this basis, an optimization of neutral point connection mode configuration is proposed to inhibit DC bias. Since the change of zero sequence impedance, at last we give sensitivity verification of zero sequence current protection base on the RelayCAC model of Yichang power grid. Simulation results show that the sensitivity meet the requirements and verify the effectiveness of the proposed method.
{"title":"Optimized neutral point connection mode configuration against DC Bias of 220 kV power transformation in Yichang power grid","authors":"Jiangtao Quan, Q. Guo, Ling Ruan, Ruiji Yu, Y. Luo, Zhicheng Wang, Fanrong Wei, Jinwen Sun, Xiangning Lin","doi":"10.1109/RTUCON.2014.6998202","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998202","url":null,"abstract":"The occurrence of DC Bias will affect the normal operation of power transformer, thus DC bias withstand capability of transformer is a prerequisite for stable operation of power system. In this paper, the DC current distribution model of transformer neutral point in Yichang area is established. Meanwhile, according to the transformer noise limit, the maximum current which is allowable to flow through transformer neutral point is determined. On this basis, an optimization of neutral point connection mode configuration is proposed to inhibit DC bias. Since the change of zero sequence impedance, at last we give sensitivity verification of zero sequence current protection base on the RelayCAC model of Yichang power grid. Simulation results show that the sensitivity meet the requirements and verify the effectiveness of the proposed method.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121193191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998189
Denis Lebedev, A. Rosin
The aim was to determine probable profit by using electric energy storage (EES) device in a typical household. Focus is on theoretical and practical studies of an energy management system (EMS) based on VRLA battery storage. Use of a battery charge-discharge-schedule (BCDS) enables an optimal operation of EES taking advantage of the low price periods by importing more energy and storing it, while reducing the imported power during high price periods by supporting the load with the stored energy. Forecasted price and load are used to optimize the BCDS of EES, at the same time ensuring load demand supply. In the day-ahead market, the management system uses the mathematical functions to calculate the price of imported energy in each period of time with the day-ahead forecasted price and typical load in the household. The recursion loops in the optimization algorithm search for the best BCDS to reach the highest profit for the end consumer. All the calculations will be tested on the EMS to confirm the theoretical part.
{"title":"Modelling of electricity spot price and load forecast based new energy management system for households","authors":"Denis Lebedev, A. Rosin","doi":"10.1109/RTUCON.2014.6998189","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998189","url":null,"abstract":"The aim was to determine probable profit by using electric energy storage (EES) device in a typical household. Focus is on theoretical and practical studies of an energy management system (EMS) based on VRLA battery storage. Use of a battery charge-discharge-schedule (BCDS) enables an optimal operation of EES taking advantage of the low price periods by importing more energy and storing it, while reducing the imported power during high price periods by supporting the load with the stored energy. Forecasted price and load are used to optimize the BCDS of EES, at the same time ensuring load demand supply. In the day-ahead market, the management system uses the mathematical functions to calculate the price of imported energy in each period of time with the day-ahead forecasted price and typical load in the household. The recursion loops in the optimization algorithm search for the best BCDS to reach the highest profit for the end consumer. All the calculations will be tested on the EMS to confirm the theoretical part.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122403549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998222
M. Savaghebi, M. Hashempour, J. Guerrero
This paper addresses the coordinated control of distributed generators (DGs) inverters and active power filters (APFs) to compensate voltage harmonics in microgrids. For this, a hierarchical control system is proposed to mitigate voltage harmonic distortion. The hierarchical control structure includes two control levels: primary control and secondary control. Primary control consists of power controllers, selective virtual impedance loops and proportional-resonant (PR) voltage/current controllers. Secondary control manages the compensation of voltage harmonic distortion of sensitive load bus (SLB). Compensation of SLB harmonics by control of DGs may cause excessive voltage harmonics at the terminal of one or more of DGs interface inverters and/oroverloading of the inverters. After occurrence of each of these cases, active power filter (APF) participates in harmonic compensation and consequently the compensation efforts of DGs decrease to avoidexcessive harmonics or loading of DGs' inverters. Effectiveness of the proposed control scheme is demonstratedthrough simulation studies.
{"title":"Hierarchical coordinated control of distributed generators and active power filters to enhance power quality of microgrids","authors":"M. Savaghebi, M. Hashempour, J. Guerrero","doi":"10.1109/RTUCON.2014.6998222","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998222","url":null,"abstract":"This paper addresses the coordinated control of distributed generators (DGs) inverters and active power filters (APFs) to compensate voltage harmonics in microgrids. For this, a hierarchical control system is proposed to mitigate voltage harmonic distortion. The hierarchical control structure includes two control levels: primary control and secondary control. Primary control consists of power controllers, selective virtual impedance loops and proportional-resonant (PR) voltage/current controllers. Secondary control manages the compensation of voltage harmonic distortion of sensitive load bus (SLB). Compensation of SLB harmonics by control of DGs may cause excessive voltage harmonics at the terminal of one or more of DGs interface inverters and/oroverloading of the inverters. After occurrence of each of these cases, active power filter (APF) participates in harmonic compensation and consequently the compensation efforts of DGs decrease to avoidexcessive harmonics or loading of DGs' inverters. Effectiveness of the proposed control scheme is demonstratedthrough simulation studies.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128775135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998187
Dmitry Shirkin, I. Rankis
The paper is devoted to investigation of the pulse modulated systems with constant impedance load based on the application of auto-transformers in the primary circuit of pulse converters allowing to provide operation of a system with restricted range of modulated load signals and such operation conditions allow to obtain better electro-magnetic compatibility of converter with AC network without application of special filtering equipment but to respect to switches - with smaller current and voltage stresses. In the paper the main characteristics of autotransformer's circuits giving possibility to provide engineering calculations are discussed in respect to the adjustability of the constant impedance load and operation parameters of the system. Some application examples are discussed - for instance for stabilizing of AC voltage of load with the changes of supply grid voltage.
{"title":"Transformer based AC pulse regulation systems","authors":"Dmitry Shirkin, I. Rankis","doi":"10.1109/RTUCON.2014.6998187","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998187","url":null,"abstract":"The paper is devoted to investigation of the pulse modulated systems with constant impedance load based on the application of auto-transformers in the primary circuit of pulse converters allowing to provide operation of a system with restricted range of modulated load signals and such operation conditions allow to obtain better electro-magnetic compatibility of converter with AC network without application of special filtering equipment but to respect to switches - with smaller current and voltage stresses. In the paper the main characteristics of autotransformer's circuits giving possibility to provide engineering calculations are discussed in respect to the adjustability of the constant impedance load and operation parameters of the system. Some application examples are discussed - for instance for stabilizing of AC voltage of load with the changes of supply grid voltage.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130570694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998177
A. Sauhats, R. Varfolomejeva
The topicality of the task of power systems regimes optimization is significantly improved under the conditions of market economy. Developing the tasks for optimization of the regimes of electrical stations and power systems the changing of the optimization criteria should be considered as a significant innovation. The power station regime optimization is stochastic, multi-dimensional, multi-parameter etc.; that is why such task optimization should be made with using games theory criterion as well as Pareto principle. In this paper the optimization stochastic algorithm is synthesized and proved its operation feasibility for the station regime.
{"title":"The power station regime management under uncertainty","authors":"A. Sauhats, R. Varfolomejeva","doi":"10.1109/RTUCON.2014.6998177","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998177","url":null,"abstract":"The topicality of the task of power systems regimes optimization is significantly improved under the conditions of market economy. Developing the tasks for optimization of the regimes of electrical stations and power systems the changing of the optimization criteria should be considered as a significant innovation. The power station regime optimization is stochastic, multi-dimensional, multi-parameter etc.; that is why such task optimization should be made with using games theory criterion as well as Pareto principle. In this paper the optimization stochastic algorithm is synthesized and proved its operation feasibility for the station regime.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130329494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998209
T. Panikovskaya, D. Chechushkov
The article presents the main trends in the Russian energy management. Demand management program based on the principles of energy conservation and the direct and indirect load control. Existing in Russia, wholesale and retail electricity markets and power are aimed at improving energy efficiency and sustainable energy consumption. The paper shows that under certain conditions for the consumer benefit (if technically possible) to reduce consumption at times of maximum loads the results in leveling of the profile load curve EPS and the presence of a positive system-wide effect.
{"title":"Consumer behavior on the Russian electricity market","authors":"T. Panikovskaya, D. Chechushkov","doi":"10.1109/RTUCON.2014.6998209","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998209","url":null,"abstract":"The article presents the main trends in the Russian energy management. Demand management program based on the principles of energy conservation and the direct and indirect load control. Existing in Russia, wholesale and retail electricity markets and power are aimed at improving energy efficiency and sustainable energy consumption. The paper shows that under certain conditions for the consumer benefit (if technically possible) to reduce consumption at times of maximum loads the results in leveling of the profile load curve EPS and the presence of a positive system-wide effect.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122078772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998180
R. Petrichenko, A. Sauhats, V. Chuvychin
This paper presents a method of dynamic allocation of the power reserve among frequency regulation's participants. Cooperative game theory approach is used for analysis of power reserve distribution. Technical and economical aspects of the issue are observed. Mathematical model of automation used for selection of optimal sharing of profit among participants was built.
{"title":"Power reserve distribution using cooperative game theory","authors":"R. Petrichenko, A. Sauhats, V. Chuvychin","doi":"10.1109/RTUCON.2014.6998180","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998180","url":null,"abstract":"This paper presents a method of dynamic allocation of the power reserve among frequency regulation's participants. Cooperative game theory approach is used for analysis of power reserve distribution. Technical and economical aspects of the issue are observed. Mathematical model of automation used for selection of optimal sharing of profit among participants was built.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122190467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-12-29DOI: 10.1109/RTUCON.2014.6998192
V. Vodovozov, Z. Raud, L. Gevorkov
A remote environment proposed in the paper enables the study electrical drives via the Web. The active learning concept of the distance education and the set of Internet-based laboratory works open the possibility to learn Basic and Advanced Courses of Electrical Drive providing a lot of benefits for both the learners and the faculty. The remote labs for the bachelor and master students are presented. Reporting and assessment procedures along with the analysis of the results obtained are discussed.
{"title":"Experiences with remote labs in electrical drive","authors":"V. Vodovozov, Z. Raud, L. Gevorkov","doi":"10.1109/RTUCON.2014.6998192","DOIUrl":"https://doi.org/10.1109/RTUCON.2014.6998192","url":null,"abstract":"A remote environment proposed in the paper enables the study electrical drives via the Web. The active learning concept of the distance education and the set of Internet-based laboratory works open the possibility to learn Basic and Advanced Courses of Electrical Drive providing a lot of benefits for both the learners and the faculty. The remote labs for the bachelor and master students are presented. Reporting and assessment procedures along with the analysis of the results obtained are discussed.","PeriodicalId":259790,"journal":{"name":"2014 55th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122840107","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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