Pub Date : 2015-10-01DOI: 10.1109/RTUCON.2015.7343166
F. Briz, A. Anuchin, I. Gulyaev
This paper analyzes the operation of AC machines at high speeds under voltage constraints. Two major issues are addressed: current regulator design and saturation techniques. Methods able to provide maximum dc bus utilization through the proper use of saturation techniques, good dynamic response and reduced sensitivity, will be proposed.
{"title":"Current regulation of AC machines under voltage constraints","authors":"F. Briz, A. Anuchin, I. Gulyaev","doi":"10.1109/RTUCON.2015.7343166","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343166","url":null,"abstract":"This paper analyzes the operation of AC machines at high speeds under voltage constraints. Two major issues are addressed: current regulator design and saturation techniques. Methods able to provide maximum dc bus utilization through the proper use of saturation techniques, good dynamic response and reduced sensitivity, will be proposed.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122055927","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343136
Yu-Jen Lin
More and more power system load models consider the induction motor to enhance dynamic analysis accuracy. Initialising the power system, including induction motors, is the first step to kick off dynamic analysis. This step is usually embodied in power flow analysis. This paper presents a method of initialising the induction motor during power flow analysis. It inspects the induction motor steady state equivalent circuit and transient state equivalent circuit, and proposes a method which iterates fewer variables to initialise the induction motor. A two-bus power system containing an induction motor by Gauss-Seidel algorithm is examined to justify the proposal.
{"title":"Initialising the induction motor for power system dynamic analysis","authors":"Yu-Jen Lin","doi":"10.1109/RTUCON.2015.7343136","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343136","url":null,"abstract":"More and more power system load models consider the induction motor to enhance dynamic analysis accuracy. Initialising the power system, including induction motors, is the first step to kick off dynamic analysis. This step is usually embodied in power flow analysis. This paper presents a method of initialising the induction motor during power flow analysis. It inspects the induction motor steady state equivalent circuit and transient state equivalent circuit, and proposes a method which iterates fewer variables to initialise the induction motor. A two-bus power system containing an induction motor by Gauss-Seidel algorithm is examined to justify the proposal.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115164063","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343162
Armands Senfelds
Conceptual analysis of repetitive current of DC load is presented for two type of data processing approaches. Offline post-processing type approach as well as online adaptive data analysis method is introduced. Application of introduced analysis in case of repetitive DC current cycle with fixed duration is presented focusing of current-time behavioral investigation. Comparison of obtained analysis data and typical fuse character curve data is presented followed by brief discussion of prospective advantages.
{"title":"Analysis of cyclic DC load currents for intelligent electrical protection","authors":"Armands Senfelds","doi":"10.1109/RTUCON.2015.7343162","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343162","url":null,"abstract":"Conceptual analysis of repetitive current of DC load is presented for two type of data processing approaches. Offline post-processing type approach as well as online adaptive data analysis method is introduced. Application of introduced analysis in case of repetitive DC current cycle with fixed duration is presented focusing of current-time behavioral investigation. Comparison of obtained analysis data and typical fuse character curve data is presented followed by brief discussion of prospective advantages.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128164898","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343173
L. Adrian, Donato Repole, L. Rbickis
Mobile robots, utilized increasingly in many applications, require accurate methods of obstacle avoidance. The proposed method assumes the robotic devices operational mechanism does not require data in the form of obstacle recognition, of the obstructions encountered. The exploration of relatively unknown environments including aerial, undersea, desert, icescapes or any dynamic environments in most instances require that obstacle avoidance be both automatic and autonomous and the matters of obstacle recognition (OR) may then be left to the controller, observer or to higher level systems where algorithms for visual or other recognition mechanisms may be achieved. A Guided Learning algorithm has been selected for evaluation to be incorporated within the robot system to allow high speed, memory-like reactions to its manoeuvres within chaotic, obstruction laden environments. The robotic device consists of a quad track quad motor crawler type vehicle, purpose built to serve the function of an autonomous environmental research vehicle and as such the paper deals with the portion of the system relating to purely OA matters. The device utilizes the received sensor data from a 24 segment passive array combined with a Guided-Learning system to control the general motion of the machine through remote and unknown locations.
{"title":"Proposed neuro-guided learning for obstacle avoidance in AMBO a robotic device","authors":"L. Adrian, Donato Repole, L. Rbickis","doi":"10.1109/RTUCON.2015.7343173","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343173","url":null,"abstract":"Mobile robots, utilized increasingly in many applications, require accurate methods of obstacle avoidance. The proposed method assumes the robotic devices operational mechanism does not require data in the form of obstacle recognition, of the obstructions encountered. The exploration of relatively unknown environments including aerial, undersea, desert, icescapes or any dynamic environments in most instances require that obstacle avoidance be both automatic and autonomous and the matters of obstacle recognition (OR) may then be left to the controller, observer or to higher level systems where algorithms for visual or other recognition mechanisms may be achieved. A Guided Learning algorithm has been selected for evaluation to be incorporated within the robot system to allow high speed, memory-like reactions to its manoeuvres within chaotic, obstruction laden environments. The robotic device consists of a quad track quad motor crawler type vehicle, purpose built to serve the function of an autonomous environmental research vehicle and as such the paper deals with the portion of the system relating to purely OA matters. The device utilizes the received sensor data from a 24 segment passive array combined with a Guided-Learning system to control the general motion of the machine through remote and unknown locations.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129586302","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343164
A. Suzdalenko, J. Zakis, O. Husev
This paper is a first attempt to analyze single-loop current sensorless control (CSC) method applied to three phase converter. The most suitable converter topology is selected among popular bidirectional AC-DC converters. The theory of CSC operation is described and evaluated by means of simulation. Results have confirmed the ability of controlling currents in rectifier and inverter mode and keeping inductor's average current over the track of reference value in discontinuous and continuous current mode.
{"title":"Development of single-loop current sensorless control for bidirectional three-phase PWM rectifier","authors":"A. Suzdalenko, J. Zakis, O. Husev","doi":"10.1109/RTUCON.2015.7343164","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343164","url":null,"abstract":"This paper is a first attempt to analyze single-loop current sensorless control (CSC) method applied to three phase converter. The most suitable converter topology is selected among popular bidirectional AC-DC converters. The theory of CSC operation is described and evaluated by means of simulation. Results have confirmed the ability of controlling currents in rectifier and inverter mode and keeping inductor's average current over the track of reference value in discontinuous and continuous current mode.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115820512","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343140
S. Farajzadeh, Mohammad H. Ramezam, P. Nielsen, E. S. Nadimi
In this study, we derive an eigenvector-based multivariate model of a power grid from the wind farm's standpoint using dynamic principal component analysis (DPCA). The main advantages of our model over previously developed models are being more realistic and having low complexity. We show that the behaviour of the power grid from the turbines perspective can be represented with the cumulative percent value larger than 95% by only 4 out of 9 registered variables, namely 3 phase voltage and current, frequency! active and reactive power. We further show that using the separation of signal and noise spaces, the dynamics of the power grid can be captured by an optimal time lag shift of two samples. The model is finally validated on a new dataset resulting in modelling error residual less than 5%.
{"title":"Power grid modelling from wind turbine perspective using principal component analysis","authors":"S. Farajzadeh, Mohammad H. Ramezam, P. Nielsen, E. S. Nadimi","doi":"10.1109/RTUCON.2015.7343140","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343140","url":null,"abstract":"In this study, we derive an eigenvector-based multivariate model of a power grid from the wind farm's standpoint using dynamic principal component analysis (DPCA). The main advantages of our model over previously developed models are being more realistic and having low complexity. We show that the behaviour of the power grid from the turbines perspective can be represented with the cumulative percent value larger than 95% by only 4 out of 9 registered variables, namely 3 phase voltage and current, frequency! active and reactive power. We further show that using the separation of signal and noise spaces, the dynamics of the power grid can be captured by an optimal time lag shift of two samples. The model is finally validated on a new dataset resulting in modelling error residual less than 5%.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126764699","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343133
M. Barara, A. Bennassar, M. Akherraz, Khalifa Hasan Alhosan, N. Al Sayari, A. R. Beig
The controllability of the electrical production is the main problem of renewable energy generators due to uncontrollable meteorological conditions. This study examines the feasibility for an isolated small power generation based on renewable energy source able to supplying different type of loads AC and DC with regulated voltage. The complete system is modelled in MatlabSimulink with three closed loops under fluctuation of the source (variable prime mover of the generators) and sudden application of loads. Both the DC voltage and AC voltage are controlled to the desired reference. The present results show the effectiveness and validity of the proposed power generation system.
{"title":"Flexible control for small power generation employing renewable energy source used in isolated communities","authors":"M. Barara, A. Bennassar, M. Akherraz, Khalifa Hasan Alhosan, N. Al Sayari, A. R. Beig","doi":"10.1109/RTUCON.2015.7343133","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343133","url":null,"abstract":"The controllability of the electrical production is the main problem of renewable energy generators due to uncontrollable meteorological conditions. This study examines the feasibility for an isolated small power generation based on renewable energy source able to supplying different type of loads AC and DC with regulated voltage. The complete system is modelled in MatlabSimulink with three closed loops under fluctuation of the source (variable prime mover of the generators) and sudden application of loads. Both the DC voltage and AC voltage are controlled to the desired reference. The present results show the effectiveness and validity of the proposed power generation system.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114557116","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343134
Aleksandr Krivchenkov, Rodion Saltanovs
Informational processes and communication network structure for V2G systems are considered on the bases of ISO/IEC 15118 standard. If WPT technology is used and vehicles are in motion wireless data transfer network must present and restrictions for data packets delivery to be analyzed. For standard wireless technologies 802.11, 802.15.1 the estimations of minimal possible delays of packets are made. The variants of wireless communication network for WPT-V2G system and moving objects are proposed.
{"title":"Analysis of wireless communications for V2G applications using WPT technology in energy transfer to mobile objects","authors":"Aleksandr Krivchenkov, Rodion Saltanovs","doi":"10.1109/RTUCON.2015.7343134","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343134","url":null,"abstract":"Informational processes and communication network structure for V2G systems are considered on the bases of ISO/IEC 15118 standard. If WPT technology is used and vehicles are in motion wireless data transfer network must present and restrictions for data packets delivery to be analyzed. For standard wireless technologies 802.11, 802.15.1 the estimations of minimal possible delays of packets are made. The variants of wireless communication network for WPT-V2G system and moving objects are proposed.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129100281","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343174
I. Bakman, L. Gevorkov
Parallel multi-pump single-drive pumping systems are widely used in water processing applications. Comparison of this type of systems to multi-pump multi-drive solutions is discussed. The drawbacks and advantages of both systems are identified. Recommendations on pumping system energy efficiency monitoring techniques which include sensorless estimation are proposed. Problem of trade-off between the energy efficiency and efficiency of pump is proposed for future research.
{"title":"Speed control strategy selection for multi-pump systems","authors":"I. Bakman, L. Gevorkov","doi":"10.1109/RTUCON.2015.7343174","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343174","url":null,"abstract":"Parallel multi-pump single-drive pumping systems are widely used in water processing applications. Comparison of this type of systems to multi-pump multi-drive solutions is discussed. The drawbacks and advantages of both systems are identified. Recommendations on pumping system energy efficiency monitoring techniques which include sensorless estimation are proposed. Problem of trade-off between the energy efficiency and efficiency of pump is proposed for future research.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123767574","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 : 2015-10-01DOI: 10.1109/RTUCON.2015.7343144
K. Kondratjevs, N. Kunicina, A. Zabasta
Constrained wireless sensor nodes in dense high rise buildings encounter negative effects from the industrial, scientific and medical (ISM) radio band interference and collisions. A method of wireless sensor density estimation is proposed as an experiment. An experimental analysis of frequency channel structure is tested and a feasible modulation and data structure is proposed to maximize sensor node life expectancy and the upper limits of node density is estimated. The target applications of the transmitters are energy (heating, water supply infrastructure, electricity monitoring) and environment parameters - moisture, CO2, air temperature.
{"title":"ISM transmitter density estimation for telemetry sensors in high rise apartment buildings","authors":"K. Kondratjevs, N. Kunicina, A. Zabasta","doi":"10.1109/RTUCON.2015.7343144","DOIUrl":"https://doi.org/10.1109/RTUCON.2015.7343144","url":null,"abstract":"Constrained wireless sensor nodes in dense high rise buildings encounter negative effects from the industrial, scientific and medical (ISM) radio band interference and collisions. A method of wireless sensor density estimation is proposed as an experiment. An experimental analysis of frequency channel structure is tested and a feasible modulation and data structure is proposed to maximize sensor node life expectancy and the upper limits of node density is estimated. The target applications of the transmitters are energy (heating, water supply infrastructure, electricity monitoring) and environment parameters - moisture, CO2, air temperature.","PeriodicalId":389419,"journal":{"name":"2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122375022","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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