H. Soliman, Mohammed H. Albadi, Hamood Al-Sheriyani, Hadhifa Al-Azakawi, Ali Al Qutaiti
This paper proposes a robust power system stabilizer(PSS) for a steam synchronous generator in Barka II power station. The PSS should be capable of damping small-disturbance oscillations (inherently existing in power systems due to e.g. load changes, lines switching...etc.) within a certain settling time for different load conditions. Also, the proposed PSS must have the conventional structure and its parameters must not be violated. To achieve this goal, robust control provides many advantages. The suggested controller is tuned by the Kharitonov’s theorem and uses the standard structure employed in industry. The problem is cast into a nonlinear constrained optimization problem to achieve the desired settling time without violating the practical values of the controller parameters. Performance of the robust PSS is evaluated by several simulations in the presence of system uncertainty due to load changes.
{"title":"Roust Power System Stabilizer Design Using Kharitonov’s Theorem: A Case Study","authors":"H. Soliman, Mohammed H. Albadi, Hamood Al-Sheriyani, Hadhifa Al-Azakawi, Ali Al Qutaiti","doi":"10.30564/ese.v1i1.1187","DOIUrl":"https://doi.org/10.30564/ese.v1i1.1187","url":null,"abstract":"This paper proposes a robust power system stabilizer(PSS) for a steam synchronous generator in Barka II power station. The PSS should be capable of damping small-disturbance oscillations (inherently existing in power systems due to e.g. load changes, lines switching...etc.) within a certain settling time for different load conditions. Also, the proposed PSS must have the conventional structure and its parameters must not be violated. To achieve this goal, robust control provides many advantages. The suggested controller is tuned by the Kharitonov’s theorem and uses the standard structure employed in industry. The problem is cast into a nonlinear constrained optimization problem to achieve the desired settling time without violating the practical values of the controller parameters. Performance of the robust PSS is evaluated by several simulations in the presence of system uncertainty due to load changes.","PeriodicalId":375676,"journal":{"name":"Electrical Science & Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122742044","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}
In this article, we report ferroelectric properties of copper ferrite CuFe2O4 nanoparticles (CFN), Barium ferrite nanoparticles BaFe2O4 (BFN) and La substituted barium ferrite Ba0.2La0.8Fe2O4 (BLFN) nanoparticles synthesized via hydrothermal technique. The X-Ray diffraction for the synthesized particles reflects the cubic phase formation for CuFe2O4, orthorhombic phase structure for the BaFe2O4 and cubic formation of Ba0.2La0.8Fe2O4 (BLFN). The structural parameters such as crystallite size and micro-strain are computed from XRD and Williamson-Hall(W-H) analysis. The polarization- electric field (P-E) loop studies gave information about the ferroelectric nature of the synthesized samples. It was noticed that the CFN particle has a lossy dielectric nature whereas BFN, BLFN samples exhibit a multiferroic nature.
{"title":"Ferroelectric Properties of CuFe2O4, BaFe2O4, Ba0.2La0.8Fe2O4 Nanoparticles","authors":"U. Naresh, R. J. Kumar","doi":"10.30564/ESE.V1I1.929","DOIUrl":"https://doi.org/10.30564/ESE.V1I1.929","url":null,"abstract":"In this article, we report ferroelectric properties of copper ferrite CuFe2O4 nanoparticles (CFN), Barium ferrite nanoparticles BaFe2O4 (BFN) and La substituted barium ferrite Ba0.2La0.8Fe2O4 (BLFN) nanoparticles synthesized via hydrothermal technique. The X-Ray diffraction for the synthesized particles reflects the cubic phase formation for CuFe2O4, orthorhombic phase structure for the BaFe2O4 and cubic formation of Ba0.2La0.8Fe2O4 (BLFN). The structural parameters such as crystallite size and micro-strain are computed from XRD and Williamson-Hall(W-H) analysis. The polarization- electric field (P-E) loop studies gave information about the ferroelectric nature of the synthesized samples. It was noticed that the CFN particle has a lossy dielectric nature whereas BFN, BLFN samples exhibit a multiferroic nature.","PeriodicalId":375676,"journal":{"name":"Electrical Science & Engineering","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127971583","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}
Controlling voltage and active or reactive losses are one of the most important issues in each power grid. In this paper, the influence of wind farm and thyristors switched capacitors on the network are considered. TSSC and Wind turbines are one of the significant components of each network. These instruments are also one of the resources of producing active and reactive power. In this study, wind farm and TSSC are already located optimally by Genetic algorithm. This network studied when a fault considered in one of buses. So that, in first step none of wind farm and TSSC are in the power grid. In the second step, both wind farm and TSSC are connected while a short circuit accrues in one of the busses or lines of the network. At the end, it will be observed that using thyristor switched capacitors and wind farm influence the network. So that, the capacity of producing the reactive and active power will be increased and totally the loss of the system will be decreased. Furthermore, the voltage profile will be in a suitable range.
{"title":"Effect of Wind Farm and Thyristor Switched Series Capacitors on a Faulty Network","authors":"Milad Gheydi, S. Bagheri","doi":"10.30564/ESE.V1I1.977","DOIUrl":"https://doi.org/10.30564/ESE.V1I1.977","url":null,"abstract":"Controlling voltage and active or reactive losses are one of the most important issues in each power grid. In this paper, the influence of wind farm and thyristors switched capacitors on the network are considered. TSSC and Wind turbines are one of the significant components of each network. These instruments are also one of the resources of producing active and reactive power. In this study, wind farm and TSSC are already located optimally by Genetic algorithm. This network studied when a fault considered in one of buses. So that, in first step none of wind farm and TSSC are in the power grid. In the second step, both wind farm and TSSC are connected while a short circuit accrues in one of the busses or lines of the network. At the end, it will be observed that using thyristor switched capacitors and wind farm influence the network. So that, the capacity of producing the reactive and active power will be increased and totally the loss of the system will be decreased. Furthermore, the voltage profile will be in a suitable range.","PeriodicalId":375676,"journal":{"name":"Electrical Science & Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116948194","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}
To develop the green polymeric membrane electrolyte, e-Polycaprolactone (PCL) was used as a host and the Ionic liquid (IL)(1-Ethyl-3-methylimidazolium tosylate) as a dopant. The IL is a source of mobile charges in the polymer electrolyte system. The composite membrane has been prepared by Hot Press method and then we characterised this membrane for ionic transportation. Formation of nanocomposite system has been ascertained from their XRD pattern. Interaction phenomenon was studied by ATR based FTIR and Laser Raman spectroscopic technique. Variation of conductivity with composition and temperature was studied with the aid of impedance spectroscopy data.
{"title":"Development of Green Polymer Electrolyte Through Hot Press Method","authors":"Kamlesh Pandey","doi":"10.30564/ESE.V1I1.594","DOIUrl":"https://doi.org/10.30564/ESE.V1I1.594","url":null,"abstract":"To develop the green polymeric membrane electrolyte, e-Polycaprolactone (PCL) was used as a host and the Ionic liquid (IL)(1-Ethyl-3-methylimidazolium tosylate) as a dopant. The IL is a source of mobile charges in the polymer electrolyte system. The composite membrane has been prepared by Hot Press method and then we characterised this membrane for ionic transportation. Formation of nanocomposite system has been ascertained from their XRD pattern. Interaction phenomenon was studied by ATR based FTIR and Laser Raman spectroscopic technique. Variation of conductivity with composition and temperature was studied with the aid of impedance spectroscopy data.","PeriodicalId":375676,"journal":{"name":"Electrical Science & Engineering","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129228997","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}
This project is concerned with surface dielectric barrier discharge (DBD), which involve designing the configuration of discharge and experiment, collecting and analysis data from experiment and simulation. Therefore, this report includes the objective of the project and general information of background. It also briefly introduces the history and theory of dielectric barrier discharge. For the experiment how to design the discharge implement and why. Then it will show the experiment in different configurations, and the analysis data collected in experiment also explain the data for finding out the properties of surface dielectric barrier discharge and what the difference between surface discharge and vertical discharge are. High frequency power supplied will be used for viewing the phenomenon of discharge. Compare the spectrums of discharge on dielectric and air discharge. Finally, it is the main conclusions and introduction of the difference of surface dielectric barrier discharge and vertical discharge. There are some conclusions. Discharge voltage increase linearly with applied voltage. Discharge power increase non-linearly with the discharge voltage. The gap of high voltage electrodes will not affect discharge voltage and discharge power. Discharge power increases with the frequency of power supply. Discharge area will expand when the applied voltage increases.
{"title":"Surface Dielectric Barrier Discharge","authors":"Xiaotong Li, S. Zhang","doi":"10.30564/ESE.V1I1.713","DOIUrl":"https://doi.org/10.30564/ESE.V1I1.713","url":null,"abstract":"This project is concerned with surface dielectric barrier discharge (DBD), which involve designing the configuration of discharge and experiment, collecting and analysis data from experiment and simulation. Therefore, this report includes the objective of the project and general information of background. It also briefly introduces the history and theory of dielectric barrier discharge. For the experiment how to design the discharge implement and why. Then it will show the experiment in different configurations, and the analysis data collected in experiment also explain the data for finding out the properties of surface dielectric barrier discharge and what the difference between surface discharge and vertical discharge are. High frequency power supplied will be used for viewing the phenomenon of discharge. Compare the spectrums of discharge on dielectric and air discharge. Finally, it is the main conclusions and introduction of the difference of surface dielectric barrier discharge and vertical discharge. There are some conclusions. Discharge voltage increase linearly with applied voltage. Discharge power increase non-linearly with the discharge voltage. The gap of high voltage electrodes will not affect discharge voltage and discharge power. Discharge power increases with the frequency of power supply. Discharge area will expand when the applied voltage increases.","PeriodicalId":375676,"journal":{"name":"Electrical Science & Engineering","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122905881","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}
R. Nayak, M. K. Roul, Ipsita Jena, Ipsita Dash, Ashish K Patra
The comparison between experimental and theoretical heat transfer inside heated vertical channels that dissipate heat from the internal surface with and without internal rings is studied. The experimental setup consists of a circular pipe which is heated electrically by providing constant heat flux on the wall. The theoretical and experimental analysis is conducted in several pipes of same diameter but different lengths. The length of the pipe varies from 450 mm to 850 mm. The length to diameter ratios are taken as L/D = 10, 12.22, 15.56, and 18.89. The value of imposed heat flux varies from 250 to 3340 W/m2. The internal ring thickness varies from 4 mm to 8 mm. separation distance between the internal rings varies from 75mm to 300 mm. The theoretical results are compared with experimental data to ascertain numerical accuracy of the method. The effects of L/D ratio, thickness of internal rings and separation distance on the heat transfer performance are studied. The experimental result is compared with theoretical, theoretical results are found by using ANSYS. In this study theoretical result for wall temperature along the height of tube, fluid temperature at exit of tube are compared with experimental data.
{"title":"Validation of Heat Transfer between Theoretical and Experimental from the Internal Surface of Vertical Tubes with Internal Rings Heated by Electrical Heating Coils","authors":"R. Nayak, M. K. Roul, Ipsita Jena, Ipsita Dash, Ashish K Patra","doi":"10.30564/ESE.V1I1.1029","DOIUrl":"https://doi.org/10.30564/ESE.V1I1.1029","url":null,"abstract":"The comparison between experimental and theoretical heat transfer inside heated vertical channels that dissipate heat from the internal surface with and without internal rings is studied. The experimental setup consists of a circular pipe which is heated electrically by providing constant heat flux on the wall. The theoretical and experimental analysis is conducted in several pipes of same diameter but different lengths. The length of the pipe varies from 450 mm to 850 mm. The length to diameter ratios are taken as L/D = 10, 12.22, 15.56, and 18.89. The value of imposed heat flux varies from 250 to 3340 W/m2. The internal ring thickness varies from 4 mm to 8 mm. separation distance between the internal rings varies from 75mm to 300 mm. The theoretical results are compared with experimental data to ascertain numerical accuracy of the method. The effects of L/D ratio, thickness of internal rings and separation distance on the heat transfer performance are studied. The experimental result is compared with theoretical, theoretical results are found by using ANSYS. In this study theoretical result for wall temperature along the height of tube, fluid temperature at exit of tube are compared with experimental data.","PeriodicalId":375676,"journal":{"name":"Electrical Science & Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128206409","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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