Pub Date : 2019-06-01DOI: 10.1109/ELMA.2019.8771657
A. Bugakova, D. Denisenko, N. Prokopenko, A. Titov
The new structures of the buffer amplifier (BA) and input differential stage (DS) for analog microcircuits and sensor interfaces are considered in the article. These circuit solutions, based on complementary field effect transistors with p-n-junction (CJFet), can be used in CJFet operational amplifiers (Op-Amp), comparators, etc., which are designed for operation at severe conditions. The proposed BA and DS operate in class AB mode, which enables to provide relatively large output currents in dynamic mode (units of milliamperes) at small static currents of transistors (40-100μA). The recommended application areas for BA and DS are analogue sensor interfaces for space instrumentation, high energy physics, and medicine.
{"title":"Basic Functional CJFet Op-Amp Nodes for Operation at Low Temperatures and at Conditions of Penetrating Radiation","authors":"A. Bugakova, D. Denisenko, N. Prokopenko, A. Titov","doi":"10.1109/ELMA.2019.8771657","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771657","url":null,"abstract":"The new structures of the buffer amplifier (BA) and input differential stage (DS) for analog microcircuits and sensor interfaces are considered in the article. These circuit solutions, based on complementary field effect transistors with p-n-junction (CJFet), can be used in CJFet operational amplifiers (Op-Amp), comparators, etc., which are designed for operation at severe conditions. The proposed BA and DS operate in class AB mode, which enables to provide relatively large output currents in dynamic mode (units of milliamperes) at small static currents of transistors (40-100μA). The recommended application areas for BA and DS are analogue sensor interfaces for space instrumentation, high energy physics, and medicine.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121520119","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771686
E. Sokolov, Miho Mihov
In this paper a method for the inductances evaluation of the interior permanent magnet synchronous motor (IPMSM) is presented. The two-axis flux linkages are estimated by the air-gap flux density fundamental components obtained by means of FE simulations combined with the frozen permeability method and the discrete Fourier transform. The magnetizing, leakage and synchronous inductances in different operating points are defined. The numerical results for an IPMSM in constant torque region by base load and overload are analyzed.
{"title":"Parameter Estimation of an Interior Permanent Magnet Synchronous Motor","authors":"E. Sokolov, Miho Mihov","doi":"10.1109/ELMA.2019.8771686","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771686","url":null,"abstract":"In this paper a method for the inductances evaluation of the interior permanent magnet synchronous motor (IPMSM) is presented. The two-axis flux linkages are estimated by the air-gap flux density fundamental components obtained by means of FE simulations combined with the frozen permeability method and the discrete Fourier transform. The magnetizing, leakage and synchronous inductances in different operating points are defined. The numerical results for an IPMSM in constant torque region by base load and overload are analyzed.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123357343","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771501
A. Chervenkov, A. Yanev, T. Chervenkova
A grid-connected 30 kW small PV system, located in Southeast Bulgaria has been studied. Performance analysis of the PV system is done. The PV system is balanced according reactive power. The total harmonic distortion THD of the object is very low and satisfies the requirements of the standards. A model of PV system is created in MATLAB. Simulations of the operation in different modes have been carried out. The electromagnetic compatibility of analyzed small PV power system is satisfied.
{"title":"Performance analysis and modelling of gridconnected small photovoltaic system","authors":"A. Chervenkov, A. Yanev, T. Chervenkova","doi":"10.1109/ELMA.2019.8771501","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771501","url":null,"abstract":"A grid-connected 30 kW small PV system, located in Southeast Bulgaria has been studied. Performance analysis of the PV system is done. The PV system is balanced according reactive power. The total harmonic distortion THD of the object is very low and satisfies the requirements of the standards. A model of PV system is created in MATLAB. Simulations of the operation in different modes have been carried out. The electromagnetic compatibility of analyzed small PV power system is satisfied.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114733025","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771519
V. Dimitrov, P. Punov, Dimitar D. Arnaudov
The paper presents an analytical model for sizing supercapacitors as part of a hybrid power supply. The load is assumed to be modeled by its power over time requirements. Approximating the theoretical curve as combinations of constant and linearly increasing power segments equations are obtained for the supercapacitor current as a function of its initial and final voltage. This allows for sizing the supercapacitor for wide variety of application. The model is verified by means of simulation and experimental results.
{"title":"Fuelcell power supply system – modelling and optimization","authors":"V. Dimitrov, P. Punov, Dimitar D. Arnaudov","doi":"10.1109/ELMA.2019.8771519","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771519","url":null,"abstract":"The paper presents an analytical model for sizing supercapacitors as part of a hybrid power supply. The load is assumed to be modeled by its power over time requirements. Approximating the theoretical curve as combinations of constant and linearly increasing power segments equations are obtained for the supercapacitor current as a function of its initial and final voltage. This allows for sizing the supercapacitor for wide variety of application. The model is verified by means of simulation and experimental results.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115080952","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771687
M. Ziegler, Michael Biburger, A. Kuehl, J. Franke
Due to the rising demand for high-efficiency electric drives, the requirements for production processes are also increasing. The process steps have a significant effect on product quality and efficiency of the electric machine. In this paper, the joining processes for stator and rotor lamination stacks i. e., interlocking, laser welding, bonding and bonding varnish are compared in a holistic evaluation process. For this purpose, practical joining tests with varying process parameters on basis of a toroidal core are carried out. In this context, the process behavior and energy demand during manufacturing are evaluated. Mechanical and electromagnetic tests are used to determine the influence of the joining parameters on product quality and electromagnetic losses. The investigations were intended to support the later development of new complex processes for electric drives.
{"title":"Influences of Joining Process Parameters on Stator and Rotor Cores for Electric Drives","authors":"M. Ziegler, Michael Biburger, A. Kuehl, J. Franke","doi":"10.1109/ELMA.2019.8771687","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771687","url":null,"abstract":"Due to the rising demand for high-efficiency electric drives, the requirements for production processes are also increasing. The process steps have a significant effect on product quality and efficiency of the electric machine. In this paper, the joining processes for stator and rotor lamination stacks i. e., interlocking, laser welding, bonding and bonding varnish are compared in a holistic evaluation process. For this purpose, practical joining tests with varying process parameters on basis of a toroidal core are carried out. In this context, the process behavior and energy demand during manufacturing are evaluated. Mechanical and electromagnetic tests are used to determine the influence of the joining parameters on product quality and electromagnetic losses. The investigations were intended to support the later development of new complex processes for electric drives.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"34 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120871397","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771685
N. Voropai, C. Rehtanz, S. Kippelt, N. Tomin, Ulf Haeger, D. Efimov, V. Kurbatsky, I. Kolosok
The TU Dortmund University (Germany) and the Energy Systems Institute of the Russian Academy of Sciences (Russia) launched a joint research project to develop a unified modelling approach for distributed flexibility options. While recent approaches for distributed flexibility fail at common understanding of flexibility in the different layers of the power system, the participants will develop a modelling framework that allows the detailed quantification of flexibility potentials with a distribution-oriented perspective as well as on a systemwide view.
德国多特蒙德大学(TU Dortmund University)和俄罗斯科学院能源系统研究所(Russian Academy of Sciences)发起了一项联合研究项目，旨在开发分布式灵活性选项的统一建模方法。虽然最近的分布式灵活性方法无法对电力系统不同层的灵活性进行共同理解，但参与者将开发一个建模框架，该框架允许从面向分布的角度以及从系统范围的角度详细量化灵活性潜力。
{"title":"The Development of a Joint Modelling Framework for Operational Flexibility in Power Systems","authors":"N. Voropai, C. Rehtanz, S. Kippelt, N. Tomin, Ulf Haeger, D. Efimov, V. Kurbatsky, I. Kolosok","doi":"10.1109/ELMA.2019.8771685","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771685","url":null,"abstract":"The TU Dortmund University (Germany) and the Energy Systems Institute of the Russian Academy of Sciences (Russia) launched a joint research project to develop a unified modelling approach for distributed flexibility options. While recent approaches for distributed flexibility fail at common understanding of flexibility in the different layers of the power system, the participants will develop a modelling framework that allows the detailed quantification of flexibility potentials with a distribution-oriented perspective as well as on a systemwide view.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"62 21","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120888988","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771641
A. Abou-El-Soud, S. H. Elbanna, W. Sabry
Due to the reduction in production and supplying of conventional fossil fuels quantities, the communities started to ask: what will be the future of electric power systems? Alternative answers and solutions are proposed to be applied instead of conventional fossil fuel power plants. Nuclear power plants are one of these leading alternatives. El-Dabaa nuclear power plant will be the 1st nuclear power plant in Egypt. 1st unit (reactor) of this plant will have only one large synchronous generator (machine) has a rated output of more than 1000 MVA (Rated at 1200 MVA). The synchronous machine will be connected to the 500 kV network while it is operating continuously 24/7, i.e. must be full loaded at all the times. This paper presents a novel control design of a strong action power system stabilizer for a nuclear power plant synchronous machine to enhance stability to this machine while it's connected to a large power grid to form a multi-machine power system. Strong action power system stabilizer can achieve system stability that allows significant increase to stability margin at steady-state period. It is effectively damp oscillations and stabilizing sub-transient and transient processes. Also, it helps to prevent sudden reductions of bus-bars voltage. In order to accomplish better damping behavior for rotor speed and terminal voltage of this machine; different signals from the machine are chosen as inputs to the strong action power system stabilizer that attached to this machine. This method confirmed its efficiency in damping frequency oscillations and terminal voltage variations of the machine. Hence, better system stability is achieved.
{"title":"A Strong Action Power System Stabilizer Application in a Multi-machine Power System Containing a Nuclear Power Plant","authors":"A. Abou-El-Soud, S. H. Elbanna, W. Sabry","doi":"10.1109/ELMA.2019.8771641","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771641","url":null,"abstract":"Due to the reduction in production and supplying of conventional fossil fuels quantities, the communities started to ask: what will be the future of electric power systems? Alternative answers and solutions are proposed to be applied instead of conventional fossil fuel power plants. Nuclear power plants are one of these leading alternatives. El-Dabaa nuclear power plant will be the 1st nuclear power plant in Egypt. 1st unit (reactor) of this plant will have only one large synchronous generator (machine) has a rated output of more than 1000 MVA (Rated at 1200 MVA). The synchronous machine will be connected to the 500 kV network while it is operating continuously 24/7, i.e. must be full loaded at all the times. This paper presents a novel control design of a strong action power system stabilizer for a nuclear power plant synchronous machine to enhance stability to this machine while it's connected to a large power grid to form a multi-machine power system. Strong action power system stabilizer can achieve system stability that allows significant increase to stability margin at steady-state period. It is effectively damp oscillations and stabilizing sub-transient and transient processes. Also, it helps to prevent sudden reductions of bus-bars voltage. In order to accomplish better damping behavior for rotor speed and terminal voltage of this machine; different signals from the machine are chosen as inputs to the strong action power system stabilizer that attached to this machine. This method confirmed its efficiency in damping frequency oscillations and terminal voltage variations of the machine. Hence, better system stability is achieved.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122472179","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771509
A. Antipin, V. Udintsev, S. Sarapulov
The use of high-frequency transformers in combination with synchronous reversible rectifiers-inverters and microprocessor-based control systems allows you to manage the exchange of energy between objects of the electrical network while simultaneously stabilizing the voltage, which improves the quality and reliability of power supply to consumers, reduces losses during transmission, distribution and power consumption. The article discusses the construction of a control system for a multifunctional electronic transformer with reversible synchronous rectifiers-inverters and a high-frequency transformer.
{"title":"Multifunctional Electronic Transformer","authors":"A. Antipin, V. Udintsev, S. Sarapulov","doi":"10.1109/ELMA.2019.8771509","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771509","url":null,"abstract":"The use of high-frequency transformers in combination with synchronous reversible rectifiers-inverters and microprocessor-based control systems allows you to manage the exchange of energy between objects of the electrical network while simultaneously stabilizing the voltage, which improves the quality and reliability of power supply to consumers, reduces losses during transmission, distribution and power consumption. The article discusses the construction of a control system for a multifunctional electronic transformer with reversible synchronous rectifiers-inverters and a high-frequency transformer.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125782764","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771652
M. Daoud, A. Elserougi, A. Abdel-Khalik, A. Massoud, R. Bojoi, S. Ahmed
MMC encounters serious limitations in the zero and low-frequency operation of variable-speed motor drives. In MMC, the voltage ripples of SubModule (SM) capacitor is inversely proportional to the phase current frequency. This paper proposes a new approach to solve the zero-/low- frequency operation technical issue of MMC-based drive systems. The proposed approach utilizes the additional degrees of freedom of multiphase machines to inject secondary-plane current components with certain magnitude and frequency in the load current to enable smooth operation during that interval. A simulation model of a three-level five- phase MMC-based Induction Machine (IM) drive system has been built using MATLAB/Simulink. In this paper, the adopted control strategy is explained and the simulation results are presented.
{"title":"Exploitation of Additional Degrees of Freedom of Multiphase Drives in Low-Frequency Operation of Modular Multilevel Converters","authors":"M. Daoud, A. Elserougi, A. Abdel-Khalik, A. Massoud, R. Bojoi, S. Ahmed","doi":"10.1109/ELMA.2019.8771652","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771652","url":null,"abstract":"MMC encounters serious limitations in the zero and low-frequency operation of variable-speed motor drives. In MMC, the voltage ripples of SubModule (SM) capacitor is inversely proportional to the phase current frequency. This paper proposes a new approach to solve the zero-/low- frequency operation technical issue of MMC-based drive systems. The proposed approach utilizes the additional degrees of freedom of multiphase machines to inject secondary-plane current components with certain magnitude and frequency in the load current to enable smooth operation during that interval. A simulation model of a three-level five- phase MMC-based Induction Machine (IM) drive system has been built using MATLAB/Simulink. In this paper, the adopted control strategy is explained and the simulation results are presented.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126863921","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 : 2019-06-01DOI: 10.1109/ELMA.2019.8771650
M. Comanescu
The paper presents a method for the estimation of the EMFs, speed, rotor position and load torque of the permanent magnet synchronous motor (PMSM) which are typically needed in sensorless control. The estimation approach uses an extended dynamic model of the motor and is done with cascaded observers; one of them employs an adaptive law. A first observer estimates the EMFs of the motor –they are fed in the tan–1 function to compute the angle of rotor position. The EMFs and the rotor position are fed into a second observer - this estimates the speed of the PMSM as well as the load torque. The load torque is obtained based on an adaptive law. In the paper, the mathematics of the observers and subsequent simulations are shown.
{"title":"Cascaded Observers for the Rotor Position, Speed and Load Torque of the PMSM using an Extended Dynamic Model","authors":"M. Comanescu","doi":"10.1109/ELMA.2019.8771650","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771650","url":null,"abstract":"The paper presents a method for the estimation of the EMFs, speed, rotor position and load torque of the permanent magnet synchronous motor (PMSM) which are typically needed in sensorless control. The estimation approach uses an extended dynamic model of the motor and is done with cascaded observers; one of them employs an adaptive law. A first observer estimates the EMFs of the motor –they are fed in the tan–1 function to compute the angle of rotor position. The EMFs and the rotor position are fed into a second observer - this estimates the speed of the PMSM as well as the load torque. The load torque is obtained based on an adaptive law. In the paper, the mathematics of the observers and subsequent simulations are shown.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126066240","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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