Pub Date : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0002
T. Szczegielniak, T. Piątek, D. Kusiak
This paper presents an analytical method for determining the magnetic field in the three–phase gas–insulated transmission line (i.e., high-current busduct) of circular cross–section geometry. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). Apart from analytical calculation, computer simulations for high-current busduct system magnetic field were also performed with the aid of the commercial FEMM software, using two–dimensional finite elements.
{"title":"Magnetic field around the screened three-phase high-current busducts","authors":"T. Szczegielniak, T. Piątek, D. Kusiak","doi":"10.21008/J.1508-4248.2016.0002","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0002","url":null,"abstract":"This paper presents an analytical method for determining the magnetic field in the three–phase gas–insulated transmission line (i.e., high-current busduct) of circular cross–section geometry. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). Apart from analytical calculation, computer simulations for high-current busduct system magnetic field were also performed with the aid of the commercial FEMM software, using two–dimensional finite elements.","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"138 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86269264","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0030
J. Tykocki, A. Jordan, D. Zelazny
Generally, the sensitivity of physical systems has been investigated using sensitivity function W(x). On the other hand, this paper uses a modified Pareto principle to examine the sensitivity of two systems: a part of a medium–voltage electricity network with wind turbines and a steel beam rigidly fixed on one end subjected to a uniform load. In the first case, objective function Fp involved active power losses in in the power grid, whereas the second case concerned displacements of the end of the beam. In order to accurately define the ABC sets a digital filter with original software was used.
{"title":"Use of the Pareto principle to assess system sensitivity","authors":"J. Tykocki, A. Jordan, D. Zelazny","doi":"10.21008/J.1508-4248.2016.0030","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0030","url":null,"abstract":"Generally, the sensitivity of physical systems has been investigated using sensitivity function W(x). On the other hand, this paper uses a modified Pareto principle to examine the sensitivity of two systems: a part of a medium–voltage electricity network with wind turbines and a steel beam rigidly fixed on one end subjected to a uniform load. In the first case, objective function Fp involved active power losses in in the power grid, whereas the second case concerned displacements of the end of the beam. In order to accurately define the ABC sets a digital filter with original software was used.","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83999121","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0016
W. Opydo, D. Opydo, Włodzimierz Bieliński
The paper presents the hypotheses of initiating mechanisms of the electric breakdown in vacuum insulation systems caused by small material granules, i.e. the microparticles. The microparticles detached from the parent electrode have an electric charge and move in the inter–electrode area due to the electric field. The role of a microparticle in initiating the breakdown in a vacuum insulation system depends to a considerable extent on the microparticle energy at the moment of its impact against the opposite electrode, i.e. on its velocity at the impact time. The paper presents calculation of the microparticle velocity values at the moment of the impact against the opposite electrode under the conditions existing in practice in the vacuum insulation systems. It was assumed for purposes of the calculation that the microparticles are spherical and made of copper, aluminum or iron, and are subjected to constant electric field. Minimum values of the microparticle velocity necessary to cause plastic deformation of the electrode surface in result of the impact are determined. (The calculations have been carried out with the computer program developed in C# language on the Visual Studio 2013 environment.)
本文提出了真空绝缘系统中由小颗粒(即微粒)引起的电击穿引发机理的假设。从母电极分离的微粒带有电荷，并且由于电场在电极间区域移动。微粒在真空绝缘系统中引发击穿的作用在很大程度上取决于微粒撞击对极时的能量，即撞击时的速度。本文介绍了在真空绝缘系统中实际存在的条件下，微粒撞击对极瞬间的速度值的计算。为了计算的目的，假设微粒是球形的，由铜、铝或铁制成，并受到恒定电场的作用。确定了在冲击作用下引起电极表面塑性变形所需的微粒速度的最小值。(计算是在Visual Studio 2013环境下用c#语言开发的计算机程序进行的。)
{"title":"The role of microparticles in initiating the electric breakdown in high–voltage vacuum insulation systems","authors":"W. Opydo, D. Opydo, Włodzimierz Bieliński","doi":"10.21008/J.1508-4248.2016.0016","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0016","url":null,"abstract":"The paper presents the hypotheses of initiating mechanisms of the electric breakdown in vacuum insulation systems caused by small material granules, i.e. the microparticles. The microparticles detached from the parent electrode have an electric charge and move in the inter–electrode area due to the electric field. The role of a microparticle in initiating the breakdown in a vacuum insulation system depends to a considerable extent on the microparticle energy at the moment of its impact against the opposite electrode, i.e. on its velocity at the impact time. The paper presents calculation of the microparticle velocity values at the moment of the impact against the opposite electrode under the conditions existing in practice in the vacuum insulation systems. It was assumed for purposes of the calculation that the microparticles are spherical and made of copper, aluminum or iron, and are subjected to constant electric field. Minimum values of the microparticle velocity necessary to cause plastic deformation of the electrode surface in result of the impact are determined. (The calculations have been carried out with the computer program developed in C# language on the Visual Studio 2013 environment.)","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82852401","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0026
Ł. Wołynka, J. Tchórzewski
{"title":"Systemic Evolutionary Algorithm inspired by the methods of quantum computing to improve the accuracy of the model on the neuronal motion the end of the robot arm PR–02","authors":"Ł. Wołynka, J. Tchórzewski","doi":"10.21008/J.1508-4248.2016.0026","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0026","url":null,"abstract":"","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88643920","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0001
T. Kaczorek
Positive continuous–time and discrete–time linear electrical circuits with zero transfer matrices are addressed. It is shown that there exists a large class of positive electrical circuits with zero transfer matrices. The electrical circuits are unreachable, unobservable and unstable for all values of the resistances, inductances and capacitances. The discrete–time linear positive electrical circuits are introduced. It is shown that: 1) the discrete–time electrical circuit is asymptotically stable for all values of the discretization step if and only if the corresponding continuous–time electrical circuit is asymptotically stable; 2) the discretization of the continuous–time electrical circuit does not change their reachability, observability and transfer matrices.
{"title":"Positive electrical circuits with zero transfer matrices and their discretization","authors":"T. Kaczorek","doi":"10.21008/J.1508-4248.2016.0001","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0001","url":null,"abstract":"Positive continuous–time and discrete–time linear electrical circuits with zero transfer matrices are addressed. It is shown that there exists a large class of positive electrical circuits with zero transfer matrices. The electrical circuits are unreachable, unobservable and unstable for all values of the resistances, inductances and capacitances. The discrete–time linear positive electrical circuits are introduced. It is shown that: 1) the discrete–time electrical circuit is asymptotically stable for all values of the discretization step if and only if the corresponding continuous–time electrical circuit is asymptotically stable; 2) the discretization of the continuous–time electrical circuit does not change their reachability, observability and transfer matrices.","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89914077","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0022
P. Kowalski, R. Smyk
In this paper a new method of the serial control of CNC machines is proposed. Actuators are controlled locally and the role of the central computer is limited to sending commands to the controller instead of sending it directly to actuators. It has been achieved with the use of the serial protocol with the use of the USB port. The taken approach leads to more reliable operation because commands are buffered and no synchronization between command stream and actuators operation is needed.
{"title":"Serial control of CNC machines","authors":"P. Kowalski, R. Smyk","doi":"10.21008/J.1508-4248.2016.0022","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0022","url":null,"abstract":"In this paper a new method of the serial control of CNC machines is proposed. Actuators are controlled locally and the role of the central computer is limited to sending commands to the controller instead of sending it directly to actuators. It has been achieved with the use of the serial protocol with the use of the USB port. The taken approach leads to more reliable operation because commands are buffered and no synchronization between command stream and actuators operation is needed.","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"9 1","pages":"245-255"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83981605","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0034
G. Twardosz, A. Twardosz
{"title":"The impact of topology of wind farms on the production of electric energy","authors":"G. Twardosz, A. Twardosz","doi":"10.21008/J.1508-4248.2016.0034","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0034","url":null,"abstract":"","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"130 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80251303","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0036
A. Dobrzycki, D. Kurz, D. Laska
{"title":"Analysis of the properties and impact of the shape of a flexible photovoltaic roof tile on the effectiveness of its performance","authors":"A. Dobrzycki, D. Kurz, D. Laska","doi":"10.21008/J.1508-4248.2016.0036","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0036","url":null,"abstract":"","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"172 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88286753","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0023
M. Kulik, M. Jagieła
{"title":"Coupled static and dynamic FE analyses of a nonlinear electromechanical vibration energy harvester","authors":"M. Kulik, M. Jagieła","doi":"10.21008/J.1508-4248.2016.0023","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0023","url":null,"abstract":"","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83632312","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 : 2016-01-01DOI: 10.21008/J.1508-4248.2016.0024
Ł. Niewiara, T. Tarczewski, L. Grzesiak
In this paper operating analysis of DC–DC converter is presented. Silicon Carbide based DC–DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC–DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). Real power semiconductors are equipped in output and input capacitances. This feature may influence the generated input signal. Parasitic capacitances and inductances of the paths causes oscillations and voltage overshoots of the input PWM signal. To avoid such phenomenon, it is necessary to use a snubber circuit. This issue is also presented. The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.
{"title":"Analysis of circuit and operation for DC–DC converter based on silicon carbide","authors":"Ł. Niewiara, T. Tarczewski, L. Grzesiak","doi":"10.21008/J.1508-4248.2016.0024","DOIUrl":"https://doi.org/10.21008/J.1508-4248.2016.0024","url":null,"abstract":"In this paper operating analysis of DC–DC converter is presented. Silicon Carbide based DC–DC converter is investigated. SiC power switches (i.e. MOSFETs and diodes) were used. Synchronous buck topology is applied for converter structure. The DC–DC converter mathematical model is also presented. The parameters of LC circuit were calculated using shown equations. Working conditions determine the values of output LC circuit (inductance and capacitance). Real power semiconductors are equipped in output and input capacitances. This feature may influence the generated input signal. Parasitic capacitances and inductances of the paths causes oscillations and voltage overshoots of the input PWM signal. To avoid such phenomenon, it is necessary to use a snubber circuit. This issue is also presented. The analysis of working conditions is presented for different switching frequencies. The size of passive components (LC) is compared for different operating points. Experimental tests results were presented. Waveforms of voltage and current signals were also shown.","PeriodicalId":10642,"journal":{"name":"Computer Applications in Electrical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88327697","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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