{"title":"Control with Sliding Mode of a Five-Phase Series-Connected Two-asynchronous Motor Drive","authors":"Omar Zouaid, L. Nezli","doi":"10.47238/ijeca.v3i1.61","DOIUrl":"https://doi.org/10.47238/ijeca.v3i1.61","url":null,"abstract":"In this paper, we study sliding mode control of series-connected five-phase two asynchronous machines supplied with a three levels inverter. After presentation of multiphase machines, we worked out the mathematical model of five phase asynchronous machine supplied with voltage inverter. Application of Park transformation reduces considerably the mathematical model of machine. After, we applied vector control and sliding mode control to the five-phase induction machine. After that, we study a multi-machine system, which comport five-phase two asynchronous machines supplied with a single voltage inverter.In the last, we had the sliding mode control of series-connected five-phase two asynchronous machines. Simulations are presented to show the effectiveness of the control strategy. We observe that an appropriate transposition of phase’s order permits an independent control of two machines.","PeriodicalId":102946,"journal":{"name":"International Journal of Energetica","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128380749","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":"Impact of fuel energy prices in Tunisia","authors":"L. Jebali, Anissa Kacem","doi":"10.47238/IJECA.V3I1.62","DOIUrl":"https://doi.org/10.47238/IJECA.V3I1.62","url":null,"abstract":"The policy of subsidizing petroleum derivatives in Tunisia distorts the real prices of goods and services. It does not take care on environment. There is no serious fiscal policies to reduce pollution generated by energy products.The calculation of the correlation matrix between different macroeconomic aggregates does not give a negative effect of oil prices on national GDP. However, this result is serious, because the impact on economic (performance) is hidden, affecting first the general level of prices, unemployment and inflation. Instability of oil prices has no apparent impact. This fact and instability make many difficulties to manage prices and inflation after revolution. Impact on GDP passes through Economic Vulnerability Indicator (EVI) and agricultural sector. ","PeriodicalId":102946,"journal":{"name":"International Journal of Energetica","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115742886","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}
M. Qolipour, A. Mostafaeipour, Mostafa Rezaei, Elham Behnam, Hossein Goudarzi, A. Razmjoo
{"title":"Selection of parameters to predict dew point temperature in arid lands using Grey theory: a case study of Iran","authors":"M. Qolipour, A. Mostafaeipour, Mostafa Rezaei, Elham Behnam, Hossein Goudarzi, A. Razmjoo","doi":"10.47238/ijeca.v4i1.79","DOIUrl":"https://doi.org/10.47238/ijeca.v4i1.79","url":null,"abstract":"Dew point is the temperature at which water vapor in the air condenses into liquid with the same rate it evaporates. Dew point study is important in arid lands with low rainfall, also in other regions with various hydrological and climatological conditions. In this study, the Grey theory is applied for the first time to propose a framework approach to identify the important parameters affecting the prediction of dew point temperature. The ability of Grey theory to estimate and rank the parameters of a problem with missing data and uncertain conditions means that it has a good potential for mentioned application. For this research, 8 parameters are selected using literature review including: global solar radiation on a horizontal surface (H), water vapor pressure (VP), atmospheric pressure (P), sunshine duration (n), minimum air temperature (Tmin), maximum air temperature (Tmax), average air temperature (Tavg), and Relative Humidity (RH). The study is conducted for the city of Abadeh in Iran by using the data pertaining to a 10 year period between 2005 and 2015. The findings show that RH, Tavg, P, Tmax, Tmin, H, n and Vp with the grey possibility degrees of, respectively, 0.534, 0.551, 0.608, 0.622, 0.635, 0.695, 0.697 and 0.712, are the most important and effective parameters in prediction of dew point temperature. The proposed method also prioritizes the studied parameters in the order of their effectiveness on predicted dew point temperature.","PeriodicalId":102946,"journal":{"name":"International Journal of Energetica","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126399002","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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