Pub Date : 2019-06-01DOI: 10.1109/ELMA.2019.8771668
Oļegs Sļiskis, Ilya Dvornikovs, Marks Marinbahs, J. Mārks, E. Groza
Transition to a low carbon emission transport is supported in all European countries, including Latvia. In this paper, a specific case of converting diesel bus into electric bus is analyzed. During its processing and development, real ready-made porotypes with field tests, and computer evaluation models are used.
{"title":"Investigation of electrical bus traction motor dynamic using methods of physical and computer simulation","authors":"Oļegs Sļiskis, Ilya Dvornikovs, Marks Marinbahs, J. Mārks, E. Groza","doi":"10.1109/ELMA.2019.8771668","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771668","url":null,"abstract":"Transition to a low carbon emission transport is supported in all European countries, including Latvia. In this paper, a specific case of converting diesel bus into electric bus is analyzed. During its processing and development, real ready-made porotypes with field tests, and computer evaluation models are used.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"191 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":"123012335","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.2019.8771689
Dimitar D. Arnaudov, Krasimir Kishkin
this paper presents analysis of voltage active balancing method for energy storage system (ESS). It is studied power resonant DC-DC converter with voltage doubler synchronous rectifier (VDSR), used to equalize the voltage across series connected supercapacitor cells, which are part from ESS. In this application, high frequency transformer is used for galvanic isolation. The proposed converter ensures turn the primary side power MOSFET on in both zero-voltage switching (ZVS) and zero–current switching (ZCS) modes and turns it off in ZVS mode. This will reduce the switching losses and improve the converter efficiency. The secondary side implemented VDSR is soft switched on and off (ZCS mode). Any known voltage balancing methods could be used to drive this resonant converter. For verification the simulations results, experimental research was done.
{"title":"Modelling And Research Of Synchrounous Converter For Active Balansing System","authors":"Dimitar D. Arnaudov, Krasimir Kishkin","doi":"10.1109/ELMA.2019.8771689","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771689","url":null,"abstract":"this paper presents analysis of voltage active balancing method for energy storage system (ESS). It is studied power resonant DC-DC converter with voltage doubler synchronous rectifier (VDSR), used to equalize the voltage across series connected supercapacitor cells, which are part from ESS. In this application, high frequency transformer is used for galvanic isolation. The proposed converter ensures turn the primary side power MOSFET on in both zero-voltage switching (ZVS) and zero–current switching (ZCS) modes and turns it off in ZVS mode. This will reduce the switching losses and improve the converter efficiency. The secondary side implemented VDSR is soft switched on and off (ZCS mode). Any known voltage balancing methods could be used to drive this resonant converter. For verification the simulations results, experimental research was done.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"29 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":"124894537","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.2019.8771670
Zhivko Zhekov, Emil Y. Marinov
In this paper is proposed neural control of a two-link planar robot. The control system contains one feedforward neural network used as both neural model and neural controller. Neural network on-line learning process, based on gradient descent rule and error backpropagation is used. Accomplished simulation research confirms sufficient system performance at load variation.
{"title":"Neural Control of Two-link Planar Robot","authors":"Zhivko Zhekov, Emil Y. Marinov","doi":"10.1109/ELMA.2019.8771670","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771670","url":null,"abstract":"In this paper is proposed neural control of a two-link planar robot. The control system contains one feedforward neural network used as both neural model and neural controller. Neural network on-line learning process, based on gradient descent rule and error backpropagation is used. Accomplished simulation research confirms sufficient system performance at load variation.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"42 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":"122503995","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.2019.8771489
I. Angelov, Nikola Stanchev, A. Mitov
The article presents the design of the hydraulic circuit diagram, synthesis of the main hydraulic parameters and equipment of experimental setup for studying of an electronically controlled closed-loop electrohydraulic system based on variable displacement axial-piston pump. The setup allows for experimental work with various pressure loads of different types of executive device: hydraulic cylinders or hydraulic motors. The equipment of the experimental system with an external control electronics provides the possibilities to carry out study not only by changing the hydraulic parameters, but also by changing of the parameters in the embedded control system.
{"title":"Experimental Study of Electronically Controlled Closed-Loop Electrohydraulic System with Variable Displacement Pump","authors":"I. Angelov, Nikola Stanchev, A. Mitov","doi":"10.1109/ELMA.2019.8771489","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771489","url":null,"abstract":"The article presents the design of the hydraulic circuit diagram, synthesis of the main hydraulic parameters and equipment of experimental setup for studying of an electronically controlled closed-loop electrohydraulic system based on variable displacement axial-piston pump. The setup allows for experimental work with various pressure loads of different types of executive device: hydraulic cylinders or hydraulic motors. The equipment of the experimental system with an external control electronics provides the possibilities to carry out study not only by changing the hydraulic parameters, but also by changing of the parameters in the embedded control system.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"128 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":"116046228","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.2019.8771511
Denitsa Darzhanova, Z. Gergova, P. Darjanov
Investigation results are presented for electrical coil thermal parameters prediction. The coil is EI transformer type construction. The time constant and steady state temperature rise are predicted, based only on limited number experimental data, using directly Least Square Method (LSM) and recommendations in [1]. The equivalent values for the coil heat capacity and thermal resistance are also calculated, which opens a way to investigate various transient processes by computer simulation. Comparative results for a separate coil and iron-cored one are presented, analyzed and discussed.
{"title":"Electrical coil thermal parameters determination by express experimental data processing","authors":"Denitsa Darzhanova, Z. Gergova, P. Darjanov","doi":"10.1109/ELMA.2019.8771511","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771511","url":null,"abstract":"Investigation results are presented for electrical coil thermal parameters prediction. The coil is EI transformer type construction. The time constant and steady state temperature rise are predicted, based only on limited number experimental data, using directly Least Square Method (LSM) and recommendations in [1]. The equivalent values for the coil heat capacity and thermal resistance are also calculated, which opens a way to investigate various transient processes by computer simulation. Comparative results for a separate coil and iron-cored one are presented, analyzed and discussed.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"29 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":"123059195","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.2019.8771683
N. Georgiev, R. Raychev
The paper presents a study of two piezoelectric spring harvesters conducted with the aim to determine the optimal construction for which better electrical characteristics are obtained. The harvesters under consideration consist of springs and concentrated masses, attached to piezoelectric transformers. Modeling by ANSYS has been performed, whereas the horizontal deviation of the mechanical system has been obtained and the charge, accumulated on the electrodes of the piezoelectric plates has been calculated. Experimental tests for validating the developed model have been carried out.
{"title":"Study of Piezoelectric Spring Harvesters","authors":"N. Georgiev, R. Raychev","doi":"10.1109/ELMA.2019.8771683","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771683","url":null,"abstract":"The paper presents a study of two piezoelectric spring harvesters conducted with the aim to determine the optimal construction for which better electrical characteristics are obtained. The harvesters under consideration consist of springs and concentrated masses, attached to piezoelectric transformers. Modeling by ANSYS has been performed, whereas the horizontal deviation of the mechanical system has been obtained and the charge, accumulated on the electrodes of the piezoelectric plates has been calculated. Experimental tests for validating the developed model have been carried out.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"24 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":"123828593","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.2019.8771516
Georgiy Markov, E. Sirakov
The present paper contains analytical and graphical application of mathematical model proposed for calculations of sound pressure level (SPL) and frequency response in near region valid for circular cone shaped acoustic drivers. Comparison of analytical results with experimental measurement for real loudspeaker SPL and frequency response in near region was made. Conclusions with practical applicability have been made for air and water environments.
{"title":"Near Region Acoustic Driver Circular Cone","authors":"Georgiy Markov, E. Sirakov","doi":"10.1109/ELMA.2019.8771516","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771516","url":null,"abstract":"The present paper contains analytical and graphical application of mathematical model proposed for calculations of sound pressure level (SPL) and frequency response in near region valid for circular cone shaped acoustic drivers. Comparison of analytical results with experimental measurement for real loudspeaker SPL and frequency response in near region was made. Conclusions with practical applicability have been made for air and water environments.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"33 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":"125382860","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.2019.8771551
L. Stoyanov, V. Lazarov, Z. Zarkov, E. Popov
The paper presents a study of the skin effect influence in the AC machines for electric drives. First the theory background from different sources is presented. Then the different approaches for the Field coefficient are compared. Finally the influence of different geometrical parameters of the stator winding on the Field coefficient for different frequencies of the stator currents is studied.
{"title":"Influence of Skin Effect on Stator Windings Resistance of AC Machines for Electric Drives","authors":"L. Stoyanov, V. Lazarov, Z. Zarkov, E. Popov","doi":"10.1109/ELMA.2019.8771551","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771551","url":null,"abstract":"The paper presents a study of the skin effect influence in the AC machines for electric drives. First the theory background from different sources is presented. Then the different approaches for the Field coefficient are compared. Finally the influence of different geometrical parameters of the stator winding on the Field coefficient for different frequencies of the stator currents is studied.","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":"128651550","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.2019.8771522
Angel Petleshkov, Yavor Lozanov
The analysis of the interruptions in a section of the power distribution network of medium voltage 20 kV - "Okolite" power line is given in the report. In 2017, new equipment was installed on the power line to locate the damaged sections more quickly and to switch them off. A classification of the reasons for the power line offs has been made before and after the modernization. The average duration of interruptions is determined. The SAIFI and SAIDI electricity continuity indicators for the period from 2012 to 2018 are determined.
{"title":"Analysis of the interruptions in a section of power distribution network medium voltage 20 kV","authors":"Angel Petleshkov, Yavor Lozanov","doi":"10.1109/ELMA.2019.8771522","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771522","url":null,"abstract":"The analysis of the interruptions in a section of the power distribution network of medium voltage 20 kV - \"Okolite\" power line is given in the report. In 2017, new equipment was installed on the power line to locate the damaged sections more quickly and to switch them off. A classification of the reasons for the power line offs has been made before and after the modernization. The average duration of interruptions is determined. The SAIFI and SAIDI electricity continuity indicators for the period from 2012 to 2018 are determined.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"13 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":"120914420","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.2019.8771658
L. Stoyanov, Ivan Govedarski, V. Lazarov
The paper presents an approach for sizing of the power supply for pumping system using PV panels. The sizing follows an appropriate algorithm containing primary potential estimation, PV energy yield calculation, study of the irrigation system, selection of appropriate pump and converter, estimation of the pumped debit, application of operation strategy, taking into account the agricultural crop, and calculation of different parameters for qualitative analysis. Different criteria are considered to determine the optimal configuration of the irrigation system – installation cost, missed for pumping debit and days with incomplete irrigation. The proposed algorithm is applied to the site of Sandanski, Bulgaria for two different agricultural crops. The results show the advantage of the PV based power supply for remote areas.
{"title":"Sizing of PV Based Power Supply for Irrigation System – Application in Sandanski, Bulgaria","authors":"L. Stoyanov, Ivan Govedarski, V. Lazarov","doi":"10.1109/ELMA.2019.8771658","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771658","url":null,"abstract":"The paper presents an approach for sizing of the power supply for pumping system using PV panels. The sizing follows an appropriate algorithm containing primary potential estimation, PV energy yield calculation, study of the irrigation system, selection of appropriate pump and converter, estimation of the pumped debit, application of operation strategy, taking into account the agricultural crop, and calculation of different parameters for qualitative analysis. Different criteria are considered to determine the optimal configuration of the irrigation system – installation cost, missed for pumping debit and days with incomplete irrigation. The proposed algorithm is applied to the site of Sandanski, Bulgaria for two different agricultural crops. The results show the advantage of the PV based power supply for remote areas.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"83 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":"128425282","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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