Pub Date : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512086
Martin Jedinák, Stanislav Prieložný, F. Janiček, Juraj Kubica
Transmission system operators deal with situations when their system does not comply with N-1 criterion on daily basis. Remedial actions are any actions which the transmission system operator implements in due time to avert a critical situation. During the year some transmission elements reach the Maximum Permanent Current Loading, a situation which is unacceptable for the safety and reliable operation of the system. After exhausting of all non-cost possible actions it is necessary to consider the measures of market-technical kind, so called redispatch. Anticipated legislative changes, whether at European, national or internal level will extend system operator's possibilities of facing and managing a critical situation.
{"title":"Cross-border redispatch as the remedial action and aspects of its implementation","authors":"Martin Jedinák, Stanislav Prieložný, F. Janiček, Juraj Kubica","doi":"10.1109/ELEKTRO.2016.7512086","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512086","url":null,"abstract":"Transmission system operators deal with situations when their system does not comply with N-1 criterion on daily basis. Remedial actions are any actions which the transmission system operator implements in due time to avert a critical situation. During the year some transmission elements reach the Maximum Permanent Current Loading, a situation which is unacceptable for the safety and reliable operation of the system. After exhausting of all non-cost possible actions it is necessary to consider the measures of market-technical kind, so called redispatch. Anticipated legislative changes, whether at European, national or internal level will extend system operator's possibilities of facing and managing a critical situation.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133283971","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512143
R. Koňar, M. Mičian, M. Smetana, V. Chudacik
The article deals with non-destructive evaluation of conductive austenitic stainless steel by eddy current and ultrasonic testing. ECA (Eddy Current Array) and TOFD (Time of Flight Diffraction) methods are used for this purpose. Real fatigue and stress-corrosion cracks are under inspection. Experimental results are presented and discussed in the paper.
{"title":"Real biomaterial cracks evaluation by eddy current and ultrasonic inspection","authors":"R. Koňar, M. Mičian, M. Smetana, V. Chudacik","doi":"10.1109/ELEKTRO.2016.7512143","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512143","url":null,"abstract":"The article deals with non-destructive evaluation of conductive austenitic stainless steel by eddy current and ultrasonic testing. ECA (Eddy Current Array) and TOFD (Time of Flight Diffraction) methods are used for this purpose. Real fatigue and stress-corrosion cracks are under inspection. Experimental results are presented and discussed in the paper.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130845696","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512047
A. Zgank
The aim of this paper was to analyze the influence of narrow-band input channel on a broadcast news speech recognition system. Different acoustic conditions can be found within a typical broadcast news domain, where narrow-band channel presents one of those with possible high impact on accuracy. A method for acoustic channel detection, based on HMM models is proposed, in order to distinguish between the input channels. The advantage of this method is its low system complexity. The Slovenian BNSI Broadcast News and SNABI speech databases were used for the experimental setup. The Slovenian UMB Broadcast News automatic speech recognizer was applied as a test-bed, modified appropriately for the task. The evaluation of HMM models for channel detection showed accuracy higher than 90% for both channel types. The channel influence analysis confirmed that narrow-band input channel significantly degrades the speech recognition accuracy, decreasing it by more than 13% absolute.
{"title":"Analyzing the influence of narrow-band channel on Slovenian broadcast news speech recognition","authors":"A. Zgank","doi":"10.1109/ELEKTRO.2016.7512047","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512047","url":null,"abstract":"The aim of this paper was to analyze the influence of narrow-band input channel on a broadcast news speech recognition system. Different acoustic conditions can be found within a typical broadcast news domain, where narrow-band channel presents one of those with possible high impact on accuracy. A method for acoustic channel detection, based on HMM models is proposed, in order to distinguish between the input channels. The advantage of this method is its low system complexity. The Slovenian BNSI Broadcast News and SNABI speech databases were used for the experimental setup. The Slovenian UMB Broadcast News automatic speech recognizer was applied as a test-bed, modified appropriately for the task. The evaluation of HMM models for channel detection showed accuracy higher than 90% for both channel types. The channel influence analysis confirmed that narrow-band input channel significantly degrades the speech recognition accuracy, decreasing it by more than 13% absolute.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124815453","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512061
Aylapogu Pramod Kumar, V. K. Bhajana, P. Drábek
This paper proposes a new ZCS interleaved bidirectional buck-boost DC-DC converter for energy storage applications. The conventional interleaved converter has been improved with the auxiliary resonant cells in order to obtain the zero current turn-off of the main switching devices. The major advantage is the reduction of switching losses in four main switching devices of the main converter by utilizing a less number of auxiliary resonant cells. This paper mainly describes the operational analysis and its simulation for theoretical expectations. The obtained results show the improved performance and soft-switching capability with reduced auxiliary resonant components.
{"title":"A novel ZCS interleaved bidirectional buck-boost DC-DC converter for energy storage applications","authors":"Aylapogu Pramod Kumar, V. K. Bhajana, P. Drábek","doi":"10.1109/ELEKTRO.2016.7512061","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512061","url":null,"abstract":"This paper proposes a new ZCS interleaved bidirectional buck-boost DC-DC converter for energy storage applications. The conventional interleaved converter has been improved with the auxiliary resonant cells in order to obtain the zero current turn-off of the main switching devices. The major advantage is the reduction of switching losses in four main switching devices of the main converter by utilizing a less number of auxiliary resonant cells. This paper mainly describes the operational analysis and its simulation for theoretical expectations. The obtained results show the improved performance and soft-switching capability with reduced auxiliary resonant components.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121100960","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512079
M. Brandt, S. Kaščák
This paper deals with experimental measurements and analysis of frequency responses SFRA (Sweep Frequency Response Analysis) measured on induction machines (IM) to the rated power of 5kW. For the rotating machines will be established the measurement procedure of frequency responses by comparing the methodology used for power transformers to respect the International standard IEC 60076-18. For the applying method SFRA for the purpose of diagnosis and analysis of the rotating machine state there are processed the results from the standard used electric diagnostic measurements for the rotating machines - measurement of the insulation condition, stator winding resistance with squirrel cage rotor and armature winding. The purpose of the experimental measurements is implementation of the SFRA method for the failure identification that arise in power IM with the rated power over 10 kW.
{"title":"Failure identification of induction motor using SFRA method","authors":"M. Brandt, S. Kaščák","doi":"10.1109/ELEKTRO.2016.7512079","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512079","url":null,"abstract":"This paper deals with experimental measurements and analysis of frequency responses SFRA (Sweep Frequency Response Analysis) measured on induction machines (IM) to the rated power of 5kW. For the rotating machines will be established the measurement procedure of frequency responses by comparing the methodology used for power transformers to respect the International standard IEC 60076-18. For the applying method SFRA for the purpose of diagnosis and analysis of the rotating machine state there are processed the results from the standard used electric diagnostic measurements for the rotating machines - measurement of the insulation condition, stator winding resistance with squirrel cage rotor and armature winding. The purpose of the experimental measurements is implementation of the SFRA method for the failure identification that arise in power IM with the rated power over 10 kW.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115401250","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512055
O. Hock, P. Drgona, V. Jaros, R. Havrila
The paper provides about method of transposition in inverse kinematics calculation of adjustable arm. The method is based on Jacobian methodology which is described in more details. At next we described Denavit-Hartenbeg parameters which are used in our work. The main aim of this work is transposition method with many case of simulation parame-ters, like as simulation step, parameters of output regulator, etc. At the end of paper we described simulation results and experimental results with physical model of manipulator.
{"title":"Transposition method for inverse kinematics","authors":"O. Hock, P. Drgona, V. Jaros, R. Havrila","doi":"10.1109/ELEKTRO.2016.7512055","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512055","url":null,"abstract":"The paper provides about method of transposition in inverse kinematics calculation of adjustable arm. The method is based on Jacobian methodology which is described in more details. At next we described Denavit-Hartenbeg parameters which are used in our work. The main aim of this work is transposition method with many case of simulation parame-ters, like as simulation step, parameters of output regulator, etc. At the end of paper we described simulation results and experimental results with physical model of manipulator.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116832596","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512050
J. Cuntala, A. Kondelová, O. Hock, M. Pridala
The aim of this paper is to build a dynamic thermal model of power LED for simulation environment COMSOL. The dynamic thermal model was based on technical and application manufacturer's data of power light emitting diode. In this way the assembled electrical and thermal model of power LED was simulated in a dynamic process of load within COMSOL simulation program. The simulation results have been subjected to verification in the real environment. Measurements of the real LED showed good agreement with the simulation results.
{"title":"Electro-thermal modeling of power LED using COMSOL environment","authors":"J. Cuntala, A. Kondelová, O. Hock, M. Pridala","doi":"10.1109/ELEKTRO.2016.7512050","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512050","url":null,"abstract":"The aim of this paper is to build a dynamic thermal model of power LED for simulation environment COMSOL. The dynamic thermal model was based on technical and application manufacturer's data of power light emitting diode. In this way the assembled electrical and thermal model of power LED was simulated in a dynamic process of load within COMSOL simulation program. The simulation results have been subjected to verification in the real environment. Measurements of the real LED showed good agreement with the simulation results.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116477635","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512093
Ivo Neborák, M. Kuchar
The paper presents dynamic properties of a current controlled DC motor drive supplied by a transistor four-quadrant pulse converter. The contribution deals with accuracy of a torque producing armature current control loop from the view of the load torque. There is shown fundamental mathematical description for the control structure of a DC motor drive with respect to the armature current. The derivations of the steady-state current deviation for the control scheme is presented. The properties are verified by MATLAB-SIMULINK program. The simulation results are presented and discussed in the end of the paper.
{"title":"Load torque impact on DC motor current control accuracy","authors":"Ivo Neborák, M. Kuchar","doi":"10.1109/ELEKTRO.2016.7512093","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512093","url":null,"abstract":"The paper presents dynamic properties of a current controlled DC motor drive supplied by a transistor four-quadrant pulse converter. The contribution deals with accuracy of a torque producing armature current control loop from the view of the load torque. There is shown fundamental mathematical description for the control structure of a DC motor drive with respect to the armature current. The derivations of the steady-state current deviation for the control scheme is presented. The properties are verified by MATLAB-SIMULINK program. The simulation results are presented and discussed in the end of the paper.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114602026","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512103
J. Talla, V. Blahnik, T. Kosan
This paper deals with grid impedance identification by current harmonics signal injection. The current signal is generated by the single phase H-bridge converter. The single phase H-bridge converter is connected in parallel to auxiliary winding of the Petersen coil. The voltage responses of converter for specific current harmonics are used for grid resonant frequency identification. This information is used as feedback for proper tuning of Petersen coil. Meanwhile the two harmonics current generation method is well known, this paper presents the twelve harmonics method. This solution provides more accurate resonant frequency estimation.
{"title":"Grid impedance identification by current harmonics signal injection","authors":"J. Talla, V. Blahnik, T. Kosan","doi":"10.1109/ELEKTRO.2016.7512103","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512103","url":null,"abstract":"This paper deals with grid impedance identification by current harmonics signal injection. The current signal is generated by the single phase H-bridge converter. The single phase H-bridge converter is connected in parallel to auxiliary winding of the Petersen coil. The voltage responses of converter for specific current harmonics are used for grid resonant frequency identification. This information is used as feedback for proper tuning of Petersen coil. Meanwhile the two harmonics current generation method is well known, this paper presents the twelve harmonics method. This solution provides more accurate resonant frequency estimation.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125962272","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 : 2016-05-16DOI: 10.1109/ELEKTRO.2016.7512044
M. Uhrina, J. Bienik, M. Vaculík
Last few years the interest of multimedia services has rapidly increased. This leads to requirements of quality assessment, especially in video domain. Compression together with transmission link imperfection are two main factors that influence the quality. This paper deals with assessment of impact of VP8 and VP9 compression standards on the video quality using objective metrics and defining theirs efficiency. The evaluation is done for four types of sequences with Full HD and Ultra HD resolutions depending on content. The results showed that VP9 codec yields better compression efficiency than VP8. Based on BjØntegaard model VP9 achieves average bitrate saving 12,77% for FHD and 14,44% for UHD resolution ranging from 5% to 21% depending on content and resolution. For more static sequences the improvement is lower and with greater motion the enhancement rises too.
{"title":"Coding efficiency of VP8 and VP9 compression standards for high resolutions","authors":"M. Uhrina, J. Bienik, M. Vaculík","doi":"10.1109/ELEKTRO.2016.7512044","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2016.7512044","url":null,"abstract":"Last few years the interest of multimedia services has rapidly increased. This leads to requirements of quality assessment, especially in video domain. Compression together with transmission link imperfection are two main factors that influence the quality. This paper deals with assessment of impact of VP8 and VP9 compression standards on the video quality using objective metrics and defining theirs efficiency. The evaluation is done for four types of sequences with Full HD and Ultra HD resolutions depending on content. The results showed that VP9 codec yields better compression efficiency than VP8. Based on BjØntegaard model VP9 achieves average bitrate saving 12,77% for FHD and 14,44% for UHD resolution ranging from 5% to 21% depending on content and resolution. For more static sequences the improvement is lower and with greater motion the enhancement rises too.","PeriodicalId":369251,"journal":{"name":"2016 ELEKTRO","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128870410","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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