Pub Date : 2019-06-01DOI: 10.1109/ELMA.2019.8771515
V. Gueorgiev, P. Rizov
The paper summarizes our experience in building a system for real time monitoring of electrical parameters of powerful pump aggregates. The pumping station supplies cooling water for the main cycle of a power plant and is considered to be a part of the safety systems of the plant. The monitoring of the pump aggregates had to be realized not as an independent system but as a "patch" to the existing system for monitoring of the power supply of the station. The measurement capabilities of the existing devices are used. A set of issues with significant impact on practical realization of such a system are discussed here.
{"title":"Real Time Monitoring of HV Electrical Machines Driving Powerful Pump Aggregates","authors":"V. Gueorgiev, P. Rizov","doi":"10.1109/ELMA.2019.8771515","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771515","url":null,"abstract":"The paper summarizes our experience in building a system for real time monitoring of electrical parameters of powerful pump aggregates. The pumping station supplies cooling water for the main cycle of a power plant and is considered to be a part of the safety systems of the plant. The monitoring of the pump aggregates had to be realized not as an independent system but as a \"patch\" to the existing system for monitoring of the power supply of the station. The measurement capabilities of the existing devices are used. A set of issues with significant impact on practical realization of such a system are discussed here.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"6 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":"124587692","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.2019.8771672
{"title":"ELMA 2019 Copyright Page","authors":"","doi":"10.1109/elma.2019.8771672","DOIUrl":"https://doi.org/10.1109/elma.2019.8771672","url":null,"abstract":"","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"19 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":"121988596","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.2019.8771545
Y. Dimitrov, V. Aleksieva, H. Valchanov
Wearable devices’ small sizes and specific device form factors (display size and limited space for input controls) require specific attention to the device interfaces development processes. The research in this paper aims to compare two different approaches in the interface design - a Novel interface based on two-finger touch interface input on touch sensitive device bezel (the surface that is around the display) to a Standard "wristwatch" style input interface based on side push buttons.
{"title":"Wearable Device Interface Comparison","authors":"Y. Dimitrov, V. Aleksieva, H. Valchanov","doi":"10.1109/ELMA.2019.8771545","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771545","url":null,"abstract":"Wearable devices’ small sizes and specific device form factors (display size and limited space for input controls) require specific attention to the device interfaces development processes. The research in this paper aims to compare two different approaches in the interface design - a Novel interface based on two-finger touch interface input on touch sensitive device bezel (the surface that is around the display) to a Standard \"wristwatch\" style input interface based on side push buttons.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"6 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":"116408462","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.2019.8771661
D. Georgiev
The simulations of electromagnetic transients in power systems require accurate representation of the elements through their models. The increasing share of HV and EHV cables gives rise to a number of questions concerning their appropriate modelling for the particular tasks. This involves knowledge of the effect of cable design and material properties on cable electrical characteristics.
{"title":"Comparative Analysis of HV Cables Electrical Characteristics","authors":"D. Georgiev","doi":"10.1109/ELMA.2019.8771661","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771661","url":null,"abstract":"The simulations of electromagnetic transients in power systems require accurate representation of the elements through their models. The increasing share of HV and EHV cables gives rise to a number of questions concerning their appropriate modelling for the particular tasks. This involves knowledge of the effect of cable design and material properties on cable electrical characteristics.","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":"126125121","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.2019.8771555
Emil Rachev, V. Petrov
There are several issues in motor drive systems implementing sensorless field oriented control with a sliding mode observer (SMO) for permanent magnet synchronous motors (PMSM). One of those issues is stability during initial motor start-up when using a ramp. This is due to the fact that at low or zero speed there isn’t a significant back-EMF signal to properly drive the observer into accurate angle tracking. Usually step commands are used to help with the transition from zero to the commanded speed as it allows for a very fast transition out of low speed operation. This paper discusses an approach to overcome issues when a ramp start is required by using an open loop control strategy for some portion of the start-up procedure.
{"title":"An Approach to Solving Ramp Start Issues in Sensorless Field Oriented Control with Sliding Mode Observer for Permanent Magnet Synchronous Motors","authors":"Emil Rachev, V. Petrov","doi":"10.1109/ELMA.2019.8771555","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771555","url":null,"abstract":"There are several issues in motor drive systems implementing sensorless field oriented control with a sliding mode observer (SMO) for permanent magnet synchronous motors (PMSM). One of those issues is stability during initial motor start-up when using a ramp. This is due to the fact that at low or zero speed there isn’t a significant back-EMF signal to properly drive the observer into accurate angle tracking. Usually step commands are used to help with the transition from zero to the commanded speed as it allows for a very fast transition out of low speed operation. This paper discusses an approach to overcome issues when a ramp start is required by using an open loop control strategy for some portion of the start-up procedure.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"41 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":"126728844","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.2019.8771534
I. Belovski, A. Aleksandrov
Thermoelectric pump is a main unit in a thermoelectric cooling system. For effective performance of the Peltier module, the heat power generated at its hot side must be dissipated by a heat sink and a fan. The present paper discusses a method for calculation of the thermal resistance of aluminum and copper heat sinks with parallel plates. The two materials are compared with respect to the number and length of the fins.
{"title":"Determination of the thermal resistance of aluminum and copper heat sink in a thermoelectric pump","authors":"I. Belovski, A. Aleksandrov","doi":"10.1109/ELMA.2019.8771534","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771534","url":null,"abstract":"Thermoelectric pump is a main unit in a thermoelectric cooling system. For effective performance of the Peltier module, the heat power generated at its hot side must be dissipated by a heat sink and a fan. The present paper discusses a method for calculation of the thermal resistance of aluminum and copper heat sinks with parallel plates. The two materials are compared with respect to the number and length of the fins.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"122 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":"127217953","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.2019.8771574
D. Bogdanov, Martin Ralchev, V. Mateev, I. Marinova
Here is presented a data processing methodology for current sensor output signal analysis based on frequency harmonics content. Hall Effect sensors measurement setup is used for data acquisition. Measured data have been processed by fast Fourier transformation algorithm in order to decompose frequency content of sensor output signal. Harmonic spectrum could be used for sensor accuracy enhancement where magnetic core saturation is distinguished by real frequency content of primary current.
{"title":"Harmonic Spectrum Filtration for Current Sensor Measurements","authors":"D. Bogdanov, Martin Ralchev, V. Mateev, I. Marinova","doi":"10.1109/ELMA.2019.8771574","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771574","url":null,"abstract":"Here is presented a data processing methodology for current sensor output signal analysis based on frequency harmonics content. Hall Effect sensors measurement setup is used for data acquisition. Measured data have been processed by fast Fourier transformation algorithm in order to decompose frequency content of sensor output signal. Harmonic spectrum could be used for sensor accuracy enhancement where magnetic core saturation is distinguished by real frequency content of primary current.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"16 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":"133742027","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.2019.8771693
Peyo Hristov, T. Hristova
The relationship between customers, Facility managements and Utility companies can be a challenge. The persistent lack of trust leads to a fraud doubts, disputes and arbitration which results are expensive. Such kind of issues generate expenses for all participants. We have developed three models based on Hyperledger Fabric and we have revealed different difficulties in an every one. Usage of Distributed Ledger Technology based solutions will bring a real value to all actors in the system.
{"title":"Explaining The DLT Applications in The Context of a Customers, Facility Managements and Utility Companies Relationship","authors":"Peyo Hristov, T. Hristova","doi":"10.1109/ELMA.2019.8771693","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771693","url":null,"abstract":"The relationship between customers, Facility managements and Utility companies can be a challenge. The persistent lack of trust leads to a fraud doubts, disputes and arbitration which results are expensive. Such kind of issues generate expenses for all participants. We have developed three models based on Hyperledger Fabric and we have revealed different difficulties in an every one. Usage of Distributed Ledger Technology based solutions will bring a real value to all actors in the system.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"27 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":"133759643","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.2019.8771635
M. Iliev, B. Bedzhev, Monika Bedzheva, Kaloyan Kanchev
The phase manipulated (PM) signals, which autocorrelation functions (ACFs) have small side-lobes, are very important for the radars, sonars, radio-navigation and radio-synchronization systems. The experience, obtained during the past seventy years, shows that the problem of synthesis of aperiodic PM signals, which ACFs have small side-lobes, is extremely hard. A promising approach for solving of this problem is the usage of mismatched filters (MMFs). Accounting this fact in the paper a new algorithm for synthesis of MMFs for processing of aperiodic PM signals is suggested. The results, obtained in the paper, could be applied in the process of development of new radio-communication devices, used for precise measurement of distances.
{"title":"An Algorithm for Synthesis of Mismatched Filters for Processing of Aperiodic Phase Manipulated Signals","authors":"M. Iliev, B. Bedzhev, Monika Bedzheva, Kaloyan Kanchev","doi":"10.1109/ELMA.2019.8771635","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771635","url":null,"abstract":"The phase manipulated (PM) signals, which autocorrelation functions (ACFs) have small side-lobes, are very important for the radars, sonars, radio-navigation and radio-synchronization systems. The experience, obtained during the past seventy years, shows that the problem of synthesis of aperiodic PM signals, which ACFs have small side-lobes, is extremely hard. A promising approach for solving of this problem is the usage of mismatched filters (MMFs). Accounting this fact in the paper a new algorithm for synthesis of MMFs for processing of aperiodic PM signals is suggested. The results, obtained in the paper, could be applied in the process of development of new radio-communication devices, used for precise measurement of distances.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"404 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":"132577917","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.2019.8771497
S. Filipova-Petrakieva
Present paper is addressed to solve the maximum energy flow problem in electrical power systems under interval uncertainties. The solution is found by analysis of two main tasks, described by basic mathematical models of controlled electrical power systems: a single source – multiple recipients and multiple sources - multiple recipients. In the suggested method the graph theory is applied. The original models mentioned above transform to the basic graph model consists of a single source – a single recipient. A new interval method for obtaining the maximum energy flow in arbitrary system using interval channel capacities is suggested. The proposed procedures have simple realization and take a small volume of computation and time resources. Numerical example of electrical power system with single source and multiple recipients is solved. The paper finishes with conclusion remarks about application areas of the new method proposed for solving the maximum flow problem under interval uncertainties.
{"title":"A novel method for determining the maximum energy flows, passed though the electrical power systems under interval uncertainty","authors":"S. Filipova-Petrakieva","doi":"10.1109/ELMA.2019.8771497","DOIUrl":"https://doi.org/10.1109/ELMA.2019.8771497","url":null,"abstract":"Present paper is addressed to solve the maximum energy flow problem in electrical power systems under interval uncertainties. The solution is found by analysis of two main tasks, described by basic mathematical models of controlled electrical power systems: a single source – multiple recipients and multiple sources - multiple recipients. In the suggested method the graph theory is applied. The original models mentioned above transform to the basic graph model consists of a single source – a single recipient. A new interval method for obtaining the maximum energy flow in arbitrary system using interval channel capacities is suggested. The proposed procedures have simple realization and take a small volume of computation and time resources. Numerical example of electrical power system with single source and multiple recipients is solved. The paper finishes with conclusion remarks about application areas of the new method proposed for solving the maximum flow problem under interval uncertainties.","PeriodicalId":304248,"journal":{"name":"2019 16th Conference on Electrical Machines, Drives and Power Systems (ELMA)","volume":"26 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":"133674955","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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