{"title":"Comparison of self excited Squirrel Cage Induction machine based Wind Energy Conversion System","authors":"Namdeo S. Gujalwar, D. Kastha, N. Kishore","doi":"10.1109/PEDES.2014.7041958","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7041958","url":null,"abstract":"This paper presents comparative evaluation of two different configurations of Wind Energy Conversion Systems (WECS) suitable for isolated loads using Squirrel Cage Induction generator (SCIG). In the first configuration the terminal voltage of a self-excited induction generator is regulated against machine speed and load variation by connecting a three-phase VSI based STATCOM in parallel to the self-excitation capacitor and the load. In the second case a back to back connected VSI pair is used to supply the power generated by the SCIG to the load at constant voltage and frequency. Comparison is made in terms of speed range of operation of the machine, load power quality and overall efficiency of power conversion.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133071786","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}
{"title":"Current based novel adaptive P&O MPPT algorithm for photovoltaic system considering sudden change in the irradiance","authors":"A. Mohapatra, B. Nayak, K. Mohanty","doi":"10.1109/PEDES.2014.7042032","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7042032","url":null,"abstract":"Optimum utilization of photovoltaic (PV) energy is possible if PV system is operated at its maximum power point (MPP). Since the MPP varies with change in irradiation and temperature, appropriate algorithm must be incorporated in the PV system to track the MPP. There are number of maximum power point tracking (MPPT) algorithms available in the literature with its own merits and demerits. Among different MPPT methods, perturb and observe (P&O) method is most popularly used for its easy implementation and simple structure. But conventional P&O method is sluggish in nature due to its fixed perturb amplitude. To overcome this, an adaptive P&O algorithm is proposed here based on current perturbation which has faster dynamics compared to the conventional P&O method. The effectiveness of the proposed method is verified using MALAB/Simulink both in steady as well as changing irradiation.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133141025","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}
{"title":"Optimal sizing of microgrid for an urban community building in south India using HOMER","authors":"Y. Kumar, R. Bhimasingu","doi":"10.1109/PEDES.2014.7042059","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7042059","url":null,"abstract":"Building microgrids are motivated to use locally available renewable energy sources to get rid of conventional utility grid outages and dependency on fossil fuels. Unit sizing plays a vital role in the design of microgrid architectures. Proper combination of distributed units will lead to optimal system configuration in terms of overall system size and cost. The nature and number of units considered for microgrid formation will significantly effects the overall system sizing. The objective of this paper is to model a microgrid for buildings, which is technically feasible and economically optimal. The analysis is carried out for a case study with the practical data of a building located in southern India. This building is associated with priority load of 2.8 MWH/day at a peak demand of 435KW and deferrable load of 2.8MWH/day at a peak demand of 245KW. The power system is modeled and optimal system configuration was estimated with the help of HOMER. Sensitivity analysis is performed to understand the effect of various uncertainties on net present cost.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133216282","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}
{"title":"A modified approach to both conventional and ANN based SVPWM controllers for voltage fed inverter in sensorless vector control IM drive","authors":"Rakesh Kumar, Sukanta Das","doi":"10.1109/PEDES.2014.7042110","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7042110","url":null,"abstract":"In this paper, space vector pulse width modulation (SVPWM) scheme for voltage fed inverter (VFI) using conventional method and artificial neural network (ANN) based approach are presented separately. In the conventional method, the difficulty of explicitly expressing cross-over and holding-angle as a function of modulation factor in overmodulation mode-I and mode-II respectively are overcome by introducing Newton's Forward Interpolation (NFI). This greatly simplifies the implementation of conventional SVPWM technique without compromising the accuracy issue. The SVPWM is further implemented by ANN based approach built with three subnets to account for three regions of inverter operation distinctly. In comparison to a single ANN taking care of all the three regions, this apparent redundancy of subnets markedly reduces the error in calculating turn-on time for inverter switches. The performances of these two schemes are quantitatively expressed by total harmonic distortion in motor line current. Finally, the schemes are also tested using VFI for sensorless vector control of induction motor drives. The results lead to conclude that the ANN based approach can successfully take over the conventional approach of SVPWM for such applications. The proposed method is validated through computer simulation using MATLAB/SEVIULINK.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123666907","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}
G. Gohil, L. Bede, R. Teodorescu, T. Kerekes, F. Blaabjerg
{"title":"Analytical method to calculate the DC link current stress in voltage source converters","authors":"G. Gohil, L. Bede, R. Teodorescu, T. Kerekes, F. Blaabjerg","doi":"10.1109/PEDES.2014.7041953","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7041953","url":null,"abstract":"The dc-link capacitor is one of the critical components, which influences the lifetime of the whole voltage source converter unit. For reliable design, the operating temperature of the dc-link capacitor should be known, which is primarily determined by the ambient temperature and the rms value of the current flowing through the dc-link capacitor. A simple analytical method to calculate the rms value of the dc-link capacitor current is presented in this paper. The effect of the line current ripple on the rms value of the dc-link capacitor current is considered. This yields accurate results, especially for the applications with high line current ripple. The effect of the pulsewidth modulation (PWM) scheme on the rms value of the dc-link current is also studied and the analysis for continuous PWM and discontinuous PWM (DPWM) schemes is presented. The proposed analytical method is also verified experimentally.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122021662","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}
Amrut Agasti, Deepesh Rai, S. Mallick, P. Bhargava
{"title":"Study of optimization of Zn salt concentration in co-electrodeposited Cu2ZnSnS4 (CZTS) thin films","authors":"Amrut Agasti, Deepesh Rai, S. Mallick, P. Bhargava","doi":"10.1109/PEDES.2014.7042098","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7042098","url":null,"abstract":"In this study, Cu2ZnSnS4 (CZTS) is co-electrodeposited using varying amount of Zn salt in electrolytic bath to study its effect on the structural, compositional and morphological properties of the CZTS films. An optimal concentration ZnS04 in solution has been determined to obtain phase pure CZTS with elemental composition suitable for use as absorber material in thin film solar cells.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"462 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125812926","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}
{"title":"Secure backup protection of transmission line using WAMS","authors":"Trupti P. Hinge, S. Dambhare","doi":"10.1109/PEDES.2014.7042148","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7042148","url":null,"abstract":"Segregated phase comparison technique, a special form of current differential protection is widely applied for the protection of transmission line due its simplicity. It takes into account the difference of phase angle of currents at two terminals of transmission line. In this paper, one Relay/PMU is placed at sending end and to calculate receiving end voltage and currents; data is used from neighbor Relay/PMU to protect long power transmission line based on synchrophasors in SMART grid. This scheme considers segregated phase comparison after compensation of line charging currents. These phase currents are compared at control center for line under consideration to detect the fault condition. An equivalent π-model of transmission line is considered for analysis and global positioning system is used for synchronised measurements. The phase differential function is developed using phase coordinates. IEEE 14 bus system is simulated in ATP/EMTP environment. The relay is assessed as a backup relay based on the communication speed for data transferring. The protection scheme is analyzed using MATLAB program which demonstrates the accuracy of the proposed scheme.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129629011","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}
{"title":"Torque ripple reduction in five-phase direct torque controlled induction motor","authors":"Yogesh N. Tatte, M. Aware","doi":"10.1109/PEDES.2014.7042048","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7042048","url":null,"abstract":"This paper presents the torque ripple reduction in the direct torque controlled (DTC) five phase induction motor (IM). The ripples are directly related to the hysteresis band of the controller in torque and flux loops within the operating switching frequency limits. It is proposed to increase the switching frequency by dither signal injection into the torque and flux control loops. A conventional DTC control of five phase model is modified by superimposing a high frequency and small amplitude triangular waveform into torque and flux error. The operation of five phase induction motor within the operating speed range indicates the reduction in the torque ripple and improves its performance in the low speed region. It is observed that the torque ripple is reduced by 30% and improvement in the total harmonic distortions (THD) of current. The overall dynamic performance improvement is indicated through MATLAB/SIMULINK simulation.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127450277","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}
Ezhil Reena Joy, B. Kushwaha, Gautam Rituraj, Praveen Kumar
{"title":"Impact of circuit parameters in contactless power transfer system","authors":"Ezhil Reena Joy, B. Kushwaha, Gautam Rituraj, Praveen Kumar","doi":"10.1109/PEDES.2014.7041991","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7041991","url":null,"abstract":"This paper presents a practical study on variable frequency, variable load and variable distance of a planar contactless power transfer (CPT) system. The study investigates the behavior of CPT system under three different cases and its characteristics plots are generated for wide range of frequency, load and distance such that the real time situations of CPT systems can be analyzed. With these results obtained from the experiments, the theory of CPT systems can be well understood and it provides a foundation for future implementation of CPT systems for various applications.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130748312","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}
{"title":"Thermal model for paralleled surface-mount power MOSFETs","authors":"Abhijit Kulkarni, V. John","doi":"10.1109/PEDES.2014.7041975","DOIUrl":"https://doi.org/10.1109/PEDES.2014.7041975","url":null,"abstract":"Power MOSFETs in surface-mount device (SMD) packages are used in circuit topologies with higher power density. Thermal modelling of these MOSFETs is necessary for estimating the allowable power loss. Use of explicit heatsink is not convenient in SMD MOSFETs compared to the through-hole packages. Hence, in many cases, it may be necessary to rely on natural air-cooling for the SMD MOSFETs. Paralleling of these MOSFETs is required in many applications for reducing the conduction losses and limiting temperature rise. In this paper, a prototype PCB and test setup are presented for obtaining the thermal model for paralleled SMD MOSFETs. It is also explained that the conventional correlations used for calculation of convective heat transfer coefficients do not apply to these devices, necessitating the need for experimental investigation. The thermal resistances obtained experimentally are significantly different compared to the datasheet values. A thermal resistance model is arrived at by using the results from experimental setup. It is shown that a thermal model based on a prototype circuit-board is an important step in optimizing the layout of the power converter.","PeriodicalId":124701,"journal":{"name":"2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132256711","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}