C. Haisan, P. Kríž, J. Cerman, P. Špatenka, E. Hnatiuc
{"title":"Characterization of gliding arc discharge with auxiliary electrodes","authors":"C. Haisan, P. Kríž, J. Cerman, P. Špatenka, E. Hnatiuc","doi":"10.1109/OPTIM.2012.6231977","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231977","url":null,"abstract":"The aim of this paper is to characterize gliding arc (GlidArc) discharge with and without auxiliary electrodes, in the same enclosure, with the same shape for the main electrodes. For characterization we will present the temperature distribution and temperature of the main electrodes for different gas flows. The influence of active species can be seen on results of pH measurement on distilled water treated with gliding arc reactors.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124219202","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":"Noise and vibration monitoring for diagnosis of DC motor's faults","authors":"M. Iorgulescu, M. Alexandru, R. Beloiu","doi":"10.1109/OPTIM.2012.6231919","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231919","url":null,"abstract":"This paper describes faults detection and diagnosis of permanent magnet dc electric motors based on noise and vibration monitoring. Detection and diagnosis of incipient faults are desirable in order to ensure product quality and improved operational efficiency of electrical equipment and to avoid the power off from supply mains. In order to do the diagnosis there are analyzed noises from the microphones and vibration from the piezoelectric accelerometer. The microphones are installed around of the frame of the equipment and the accelerometer is mounted on the frame's motor. The Fast Fourier Transform is applied to the acquired signals. We observe significant noise and vibration spectrum differences between “healthy” motors and fault's electrical motor. The high-frequency spectral analysis of noise and vibration provides a method to detect motors faults.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121671089","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":"Fuzzy logic based MPPT controller for a small wind turbine system","authors":"D. Petrila, F. Blaabjerg, N. Muntean, C. Lascu","doi":"10.1109/OPTIM.2012.6231936","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231936","url":null,"abstract":"This paper describes the design of a maximum power point tracking (MPPT) strategy for a variable speed, small scale, wind turbine systems based on a fuzzy logic controller (FLC). The FLC has as input variables the change in mechanical power (ΔPm), the change in rotor speed (Δω), and the sign of ΔPm/Δω. The change of reference generator current (ΔI*) is the output variable. For small power applications, when the turbine inertia is relatively small, and the wind speed changes continuously, it is important to consider the transients in order to develop an accurate theoretical model and to attain optimal operation. Therefore, the mechanical power (Pm) is composed of the generator mechanical (input) power (Pg) plus the dynamic power, resulting in the dynamic power versus rotating speed curve. The controller is able to track the maximum power point for changing wind conditions, and is robust with respect to turbine parameter changes. The FLC is described, analyzed and validated by digital simulations.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124772925","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":"Optimization techniques for improving the preventive maintenance on power transformers","authors":"M. Mircea, M. Boruz, C. Mihai","doi":"10.1109/OPTIM.2012.6231928","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231928","url":null,"abstract":"Power transformers are the most expensive and important equipments in power stations. Therefore, their safe operation and life extension are dominant targets for electricity suppliers. By promoting modern techniques and modern equipments of monitoring and diagnosing the transformers degradation can be monitored over time. Fault identification allows to prevent serious events and consequently to minimize the electricity outages and repairing costs. This paper gives basic instructions and presents objective functions regarding preventive maintenance optimization.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123587068","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 calculation of induction heater capacitance with smart bacteria foraging algorithm","authors":"M. Asadi Z, E. Daryabeigi","doi":"10.1109/OPTIM.2012.6231825","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231825","url":null,"abstract":"In design of a parallel resonant Induction heating system, choosing a proper capacitance for the resonant circuit is quite important. The capacitance affects the resonant frequency, output power, heating efficiency and power factor. In this paper, with consideration to the function of equivalent series resistance (ESR), optimal capacitance is calculated. The induction heating resonance capacitor is achieved by using Smart Bacteria Foraging Algorithm (SBFA) under voltage and frequency constraints for minimizing cost function that is including: increasing the output power, efficiency of an induction heater, while decreasing the power loss of the capacitor. The proposed algorithm mimics chemotactic behavior of E. Coli bacteria to optimize parameters. The proposed algorithm enjoys individual and social intelligence. Based on the equivalent circuit model of an induction heating system, the output power, and the capacitor losses are calculated. The effectiveness of the proposed method is verified by computer simulations, also improving the obtained results using SBFA are compared to classical bacteria foraging algorithm BFA.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125497073","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":"Analysis of the module-voltage fluctuations of the Modular Multilevel Converter at variable speed drive applications","authors":"M. Spichartz, V. Staudt, A. Steimel","doi":"10.1109/OPTIM.2012.6231806","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231806","url":null,"abstract":"For medium-voltage drives multilevel converters are advantageous to reduce the insulation stress of the windings of the machine. State of the art are multilevel converters as Diode Clamped Converter, Imbricated Cell Converter or Stacked H-Bridge Converter with a low number of levels limited by the restrictions in practical construction. The Modular Multilevel Converter is not limited in the number of levels. Its modularity allows a nearly unlimited cascading of sub-modules and therewith of voltage levels at the same complexity in construction. The challenges of this topology used as drive converter are the AC fluctuations of the sub-module voltages rising with sinking output frequency. This paper derives analytically equations for the module-voltage fluctuations for two different controls using the converter in the whole speed range. The results are analysed and compared to simulation results.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130516612","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}
A. Pruteanu, B. Florean, Georgiana Maria Moraru, Romeo Ciobanu
{"title":"Development of a thermal simulation and testing model for a superior lithium-ion-polymer battery","authors":"A. Pruteanu, B. Florean, Georgiana Maria Moraru, Romeo Ciobanu","doi":"10.1109/OPTIM.2012.6231870","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231870","url":null,"abstract":"The battery thermal management is a very important factor which can affect the batteries performance and life span. This paper proposes a method for the thermal behaviour prediction of an energy storage device. For this, a superior lithium ion polymer battery was utilised, battery that is more often used in automotive domain due to its high energy and power density. The results obtained from the simulation model have been compared with the experimental results of the battery.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124685633","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":"Comparison of efficiency of two dc-to-ac converters for grid connected solar applications","authors":"H. Ertan, E. Dogru, Arif Yilmaz","doi":"10.1109/OPTIM.2012.6231990","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231990","url":null,"abstract":"In this paper; requirements from grid connected photovoltaic (PV) converters are briefly reviewed. Traditional buck-converter, line-frequency transformer topology is taken as reference, which satisfies all of the requirements imposed by standards and the utility. However, this topology employs a bulky transformer. Furthermore, a large electrolytic capacitor is needed in this circuit, which is expensive and also limits the life of the converter. This is not desirable in modern applications where PV module strings, each with its own dc-ac converter and MPP (maximum power point) tracking are employed or several strings with their own MPP units producing dc output are connected in parallel. In the latter application dc output of PV modules are converted to ac and synchronized to mains via a common dc-ac converter. Grid connected solar electric converters may have to operate satisfactorily in islanding mode. A converter topology, which is capable of operating in voltage source mode and hence suitable for this mode of operation, is considered. In this topology, a rectified sinus bus is created using a buck or boost converter. This stage is followed by an inverter stage which generates an ac waveform. There is little information on the efficiency of this topology, which promises to be cost effective and is likely to have a long lifetime. Both topologies are implemented and evaluated in this paper. It is shown that the rectified sinus bus topology can have very high efficiency (96-97% range) and overall conversion efficiency is just as good as the traditional topology but with much smaller size and cost and long operating lifetime.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129967807","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":"Influence of the filtration circuit parameters of an induction motor drive on stability","authors":"S. Enache, A. Câmpeanu, I. Vlad, M. Enache","doi":"10.1109/OPTIM.2012.6231798","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231798","url":null,"abstract":"The paper analyzes a nowadays problem, the stability of the systems consisting in voltage and frequency static converter with direct current intermediary circuit - induction motor. In this purpose, there has been established the operational mathematical model obtained from the two-axes theory equations. This model has been used to conceive a Matlab program used for the stability analysis by the method of the roots geometric locus. The program has led to a few conclusions, verified by experience, regarding the influences of the filtration capacity and inductivity on the system stability.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131218862","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":"Effects of stator slot magnetic wedges on the induction motor performances","authors":"G. Madescu, M. Greconici, M. Biriescu, M. Mot","doi":"10.1109/OPTIM.2012.6231861","DOIUrl":"https://doi.org/10.1109/OPTIM.2012.6231861","url":null,"abstract":"The paper presents some aspects of magnetic wedges application in electrical machines. The slot opening distorts the waveform of the air-gap flux density and produces high order space harmonics, which causes increased additional losses and torque ripples and reduces both the power factor and efficiency of the machines. FEM-analysis is used in order to investigate some effects of stator slot magnetic wedges on an induction motor performances. The test results and FEM-simulations are very close and prove that the utilization of magnetic wedges is a good solution to improve the performances of the induction motor with open stator slots.","PeriodicalId":382406,"journal":{"name":"2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)","volume":"519 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134100259","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}