Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156622
J. Chaudhary, A. Mitra, D. Chatterjee
Wind energy is considered to be the most technically and economically viable among all renewable energy sources. Recent technologies related to wind energy are mostly equipped with doubly fed induction generator (DFIG) because of its several advantages. In this paper a study on the impacts of DFIGs on large multi-machine system on aspects of small signal stability is presented. It is shown that improvement in small signal stability of a large multi machine system is location dependent. Also the optimum loading of DFIG is determined in terms of some sensitivity analysis.
{"title":"Effect of doubly fed induction generator based wind farms on the small signal stability of multi-machine power system","authors":"J. Chaudhary, A. Mitra, D. Chatterjee","doi":"10.1109/ICPES.2011.6156622","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156622","url":null,"abstract":"Wind energy is considered to be the most technically and economically viable among all renewable energy sources. Recent technologies related to wind energy are mostly equipped with doubly fed induction generator (DFIG) because of its several advantages. In this paper a study on the impacts of DFIGs on large multi-machine system on aspects of small signal stability is presented. It is shown that improvement in small signal stability of a large multi machine system is location dependent. Also the optimum loading of DFIG is determined in terms of some sensitivity analysis.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116401471","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 : 2011-12-01DOI: 10.1109/ICPES.2011.6156694
Toshikatsu Tanaka
Nanocomposites are composed of host and guest materials in general. They should be fabricated so that they may be endowed with superb performances of the guest filler materials, while keeping original performances of the host materials. In general, inorganic materials are excellent in optical, electrical, mechanical and thermal properties, while organic materials are superb in light weight, flexibility, and processability. Such performances for both materials can be transferred, complementarily, to nanocomposites. Furthermore, novel performances that neither of them holds by nature will possibly appear in newly fabricated nanocomposites. There are three kinds of combination as for hosts and guests, i.e. inorganic-inorganic, inorganic-organic, and organic-organic composite systems. The materials that attract most attention to-date are nanocomposites that consist of organic polymers as host and inorganic substances as guest. This field was pioneered by the successful invention of polyamide/organic clay nanocomposites in 1990's. Much attention was directed toward mechanical and optical properties in the beginning. Furthermore, recent investigation is oriented also to performances including gas barrier, lubrication, thermal endurance, heat radiation, electrical conductivity, electrical insulation, aiming at drastic changes in such performances that are expected to appear by controlling material structures in nanometer scale in self-assembly mode. Investigation of various polymer nanocomposites has been intensively made on permittivity, loss tangent, electrical conductivity, space charge, TSC, dielectric breakdown, treeing breakdown (short time breakdown and treeing V-t characteristics), partial discharge (PD) resistance, electroluminescence and any other relevant characteristics. It is now recognized that all the performances as indicated above show the superiority of nanocomposites to conventional composites and especially the improvement of PD resistance, the prolongation of treeing lifetime, and the suppression of space charge formation are most prominent among them as nanocomposites. New application innovation for power apparatus is certainly expected through polymer nanocomposites.
{"title":"Nanodielectics: How does the presence of interfaces influence behaviour?","authors":"Toshikatsu Tanaka","doi":"10.1109/ICPES.2011.6156694","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156694","url":null,"abstract":"Nanocomposites are composed of host and guest materials in general. They should be fabricated so that they may be endowed with superb performances of the guest filler materials, while keeping original performances of the host materials. In general, inorganic materials are excellent in optical, electrical, mechanical and thermal properties, while organic materials are superb in light weight, flexibility, and processability. Such performances for both materials can be transferred, complementarily, to nanocomposites. Furthermore, novel performances that neither of them holds by nature will possibly appear in newly fabricated nanocomposites. There are three kinds of combination as for hosts and guests, i.e. inorganic-inorganic, inorganic-organic, and organic-organic composite systems. The materials that attract most attention to-date are nanocomposites that consist of organic polymers as host and inorganic substances as guest. This field was pioneered by the successful invention of polyamide/organic clay nanocomposites in 1990's. Much attention was directed toward mechanical and optical properties in the beginning. Furthermore, recent investigation is oriented also to performances including gas barrier, lubrication, thermal endurance, heat radiation, electrical conductivity, electrical insulation, aiming at drastic changes in such performances that are expected to appear by controlling material structures in nanometer scale in self-assembly mode. Investigation of various polymer nanocomposites has been intensively made on permittivity, loss tangent, electrical conductivity, space charge, TSC, dielectric breakdown, treeing breakdown (short time breakdown and treeing V-t characteristics), partial discharge (PD) resistance, electroluminescence and any other relevant characteristics. It is now recognized that all the performances as indicated above show the superiority of nanocomposites to conventional composites and especially the improvement of PD resistance, the prolongation of treeing lifetime, and the suppression of space charge formation are most prominent among them as nanocomposites. New application innovation for power apparatus is certainly expected through polymer nanocomposites.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122896464","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 : 2011-12-01DOI: 10.1109/ICPES.2011.6156619
R. Reddy, N. Lakshminarasamma
This paper analyzes the steady state operation of a Synchronous Soft Switched Buck Converter which has the advantages of both synchronous switching and soft switching. This topology employs an auxiliary circuit to achieve soft switching. The auxiliary circuit consists of a dependent voltage source, an auxiliary switch, a resonant diode, a resonant inductor and a resonant capacitor. The dependent voltage source is realized by a mutually coupled inductor. In this topology, the switching transitions of the active switch, the synchronous switch and the auxiliary switch are lossless. The design guidelines are presented and a 33 Watt converter is designed, simulated and fabricated to validate the operation of the converter. A microcontroller is used to generate the switching pulses. An improvement of 6% in efficiency is observed over traditional topologies.
{"title":"Analysis, design and implementation of soft switching in a synchronous converter","authors":"R. Reddy, N. Lakshminarasamma","doi":"10.1109/ICPES.2011.6156619","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156619","url":null,"abstract":"This paper analyzes the steady state operation of a Synchronous Soft Switched Buck Converter which has the advantages of both synchronous switching and soft switching. This topology employs an auxiliary circuit to achieve soft switching. The auxiliary circuit consists of a dependent voltage source, an auxiliary switch, a resonant diode, a resonant inductor and a resonant capacitor. The dependent voltage source is realized by a mutually coupled inductor. In this topology, the switching transitions of the active switch, the synchronous switch and the auxiliary switch are lossless. The design guidelines are presented and a 33 Watt converter is designed, simulated and fabricated to validate the operation of the converter. A microcontroller is used to generate the switching pulses. An improvement of 6% in efficiency is observed over traditional topologies.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129963061","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 : 2011-12-01DOI: 10.1109/ICPES.2011.6156675
R. Dubey, S. Samantaray, B. Babu, S. N. Kumar
Wavelet transform based energy function approach for detection of some power quality (PQ) disturbances such voltage sag, voltage flicker, voltage swell, harmonics, inter harmonics in grid connected wind power system is proposed in this paper. The current signal is processed through Wavelet transform for PQ events detection. Initially, the current is retrieved at a sampling frequency of 20 kHz and DWT is used to decompose the signals of PQ events and to extract its useful information. In the case study, the power quality disturbances are created in the grid, and proposed algorithm detects the power quality disturbances effectively within one and half cycles for 60 Hz system. Thus, a new diagnostic method based on the grid modulating signals pre-processed by Discrete Wavelet Transform (DWT) is proposed to detect grid power quality disturbances. The system is simulated using MATLAB software and simulation results demonstrate the effectiveness of the proposed approach under time-varying conditions.
{"title":"Detection of power quality disturbances in presence of DFIG wind farm using wavelet transform based energy function","authors":"R. Dubey, S. Samantaray, B. Babu, S. N. Kumar","doi":"10.1109/ICPES.2011.6156675","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156675","url":null,"abstract":"Wavelet transform based energy function approach for detection of some power quality (PQ) disturbances such voltage sag, voltage flicker, voltage swell, harmonics, inter harmonics in grid connected wind power system is proposed in this paper. The current signal is processed through Wavelet transform for PQ events detection. Initially, the current is retrieved at a sampling frequency of 20 kHz and DWT is used to decompose the signals of PQ events and to extract its useful information. In the case study, the power quality disturbances are created in the grid, and proposed algorithm detects the power quality disturbances effectively within one and half cycles for 60 Hz system. Thus, a new diagnostic method based on the grid modulating signals pre-processed by Discrete Wavelet Transform (DWT) is proposed to detect grid power quality disturbances. The system is simulated using MATLAB software and simulation results demonstrate the effectiveness of the proposed approach under time-varying conditions.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126875676","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 : 2011-12-01DOI: 10.1109/ICPES.2011.6156612
S. Murthy, R. Ahuja, J. K. Chaudhary
This paper presents the design of an analog electronic load controller (ELC) suitable for stand alone pico-hydel power stations having a three phase SEIG feeding single phase load, which is highly simple, cost effective and encapsulate protective features. Proposed ELC incorporates 0–100% duty ratio of chopper for PWM pulses. Power supply for controller and cabinet cooling fan is also extracted from SEIG terminals. Proposed ELC is very cost effective and viable with minimum number of components and full protections, tested in laboratory for 5.5kW load. Performance of the above system is simulated and supplemented with experimental results.
{"title":"Design and fabrication of a low cost analog electronic load controller for a self excited induction generator supplying single-phase loads","authors":"S. Murthy, R. Ahuja, J. K. Chaudhary","doi":"10.1109/ICPES.2011.6156612","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156612","url":null,"abstract":"This paper presents the design of an analog electronic load controller (ELC) suitable for stand alone pico-hydel power stations having a three phase SEIG feeding single phase load, which is highly simple, cost effective and encapsulate protective features. Proposed ELC incorporates 0–100% duty ratio of chopper for PWM pulses. Power supply for controller and cabinet cooling fan is also extracted from SEIG terminals. Proposed ELC is very cost effective and viable with minimum number of components and full protections, tested in laboratory for 5.5kW load. Performance of the above system is simulated and supplemented with experimental results.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126925696","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 : 2011-12-01DOI: 10.1109/ICPES.2011.6156639
S. Mohapatro, B. S. Rajanikanth
In this paper a study on effect of different energization on removal of NOX in diesel engine exhaust has been presented. Here we made a detailed qualitative study of effect of pulsed/ac/dc voltage energizations on the NOX treatment of using conventional wire-cylinder reactor configuration. It was observed that amongst different energizations, pulse energization exhibits maximum NOX removal efficiency when compared to ac and dc energizations. For a given specific energy density, wire-cylinder reactor filled with BaTiO3 pellet gives higher NOX removal efficiency when compared to reactor without pellets under both pulse and ac energization. The dc energization does not have much impact on the removal processes. The paper further discusses the individual energization cases in detail.
{"title":"A core study on NOX removal in diesel exhaust by pulsed/ac/dc electric discharge plasma","authors":"S. Mohapatro, B. S. Rajanikanth","doi":"10.1109/ICPES.2011.6156639","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156639","url":null,"abstract":"In this paper a study on effect of different energization on removal of NOX in diesel engine exhaust has been presented. Here we made a detailed qualitative study of effect of pulsed/ac/dc voltage energizations on the NOX treatment of using conventional wire-cylinder reactor configuration. It was observed that amongst different energizations, pulse energization exhibits maximum NOX removal efficiency when compared to ac and dc energizations. For a given specific energy density, wire-cylinder reactor filled with BaTiO3 pellet gives higher NOX removal efficiency when compared to reactor without pellets under both pulse and ac energization. The dc energization does not have much impact on the removal processes. The paper further discusses the individual energization cases in detail.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115029905","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 : 2008-10-31DOI: 10.1109/ISEIM.2008.4664597
Masafumi Suzuki, N. Yoshimura
It is widely recognized that degradation by water tree of electrical power cables would cause serious problems. Therefore, many methods have been studied in order to detect water tree at the early stages. The loss current analysis is one of the methods which can detect water tree, since the degradation of CV cable by water tree gives rise to harmonics in the loss current. Many researches by simulation and experiment have been carried out for the purpose of the elucidation of the mechanism of the harmonics in the loss current generation. In the present study, a polyethylene sample where water tree was generated was replaced by the equivalent circuit composed of a lot of resistance, capacitor and voltage dependent resistance. These elements were united like the network. It will be possible to consider not only length of water tree but also shape of water tree by this method. From the simulation results, it has been understood that the characteristics of loss current vary greatly depending on not only the length of water tree but also the shape of water tree.
{"title":"Three-dimensional equivalent circuit analysis of water tree","authors":"Masafumi Suzuki, N. Yoshimura","doi":"10.1109/ISEIM.2008.4664597","DOIUrl":"https://doi.org/10.1109/ISEIM.2008.4664597","url":null,"abstract":"It is widely recognized that degradation by water tree of electrical power cables would cause serious problems. Therefore, many methods have been studied in order to detect water tree at the early stages. The loss current analysis is one of the methods which can detect water tree, since the degradation of CV cable by water tree gives rise to harmonics in the loss current. Many researches by simulation and experiment have been carried out for the purpose of the elucidation of the mechanism of the harmonics in the loss current generation. In the present study, a polyethylene sample where water tree was generated was replaced by the equivalent circuit composed of a lot of resistance, capacitor and voltage dependent resistance. These elements were united like the network. It will be possible to consider not only length of water tree but also shape of water tree by this method. From the simulation results, it has been understood that the characteristics of loss current vary greatly depending on not only the length of water tree but also the shape of water tree.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"254 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121892773","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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