Majlesi Journal of Energy Management http://journals.iaumajlesi.ac.ir/em/index/index.php/em <p>The scope of MJEM is ranging from mathematical foundation to practical engineering design in all areas of energy management. The editorial board is international and original unpublished papers are welcome from throughout the world. The journal is devoted primarily to research papers, but very high quality survey and tutorial papers are also published.</p> <p>There is no publication charge for the authors.</p> en-US ee@iaumajlesi.ac.ir (Dr. Mohsen Ashourian) support@tabaweb.ir (Taba Web) Thu, 29 Aug 2019 05:47:11 +0000 OJS 3.1.0.1 http://blogs.law.harvard.edu/tech/rss 60 Analysis of Wind Behavior in Openings by CFD, in order to Enhance Natural Ventilation in Residential Buildings Design of Moderate and Humid Climate (Case of study: city of Gorgan) http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/359 <p>Today, increasing environmental pollution due to the use of fossil fuels to provide thermal comfort is one of the problems of this area. The amount of these contaminants in residential buildings are more tangible. By referring to the traditional architecture, it can be seen that natural ventilation was provided by using natural forces (in this article: wind). Therefore, it can be concluded that the proper use of effective elements on natural ventilation can solve the problems created by air conditioning in new buildings. This article was identified different models of locating of openings in buildings (city of Gorgan) and analyzed the wind behavior in each of these models in terms of natural ventilation and finally, the optimal model for natural ventilation was selected. In this article, qualitative research methodology to identify and study the methods of using wind in vernacular habitats was used firstly. Then by CFD modeling and choosing selected models in terms of location of openings in order to improve the natural ventilation, Wind behavior analysis in these models was performed by the simulation research method (Gambit 2.4.6 software for making model geometry and creating grid mesh and Ansys FLUENT 15 for wind behavior analysis). As a result of analyzes, models that had northeastern-southwest direction, more openings in the southwest elevation and the suction window in the opposite direction were selected as the optimal model for residential buildings in city of Gorgan.</p> Fatemeh Rezaei ##submission.copyrightStatement## http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/359 Thu, 01 Aug 2019 04:46:55 +0000 Energy storage system sitting and sizing in the presence of responsible demands in energy and reserve markets http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/360 <p>Recently, the cooperation of energy storage systems and demand response programs in providing efficient energy management scheme have attracted enormous attention among researches. Considering the high capital cost of energy storage systems, the optimal economically sizing and sitting in distribution networks is an ineluctable task. In this paper, the optimal allocation of energy storage units in the presence of demand response programs has been studied. This paper is the updated version of our conference paper, in which the participation of responsive demands in both energy and reserve markets via direct and indirect participation is considered. Also, the block order participation modeling for demand response aggregator is formulated. The optimization problem is solved using GAMS optimization software. The results show that integration of demand response programs and energy storage systems in distribution networks can decrease system operation’s annual cost by about 10%.</p> Alireza Akbari-Dibavar, Sayyad Nojavan, Kazem Zare, Behnam Mohammadi-Ivatloo ##submission.copyrightStatement## http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/360 Thu, 01 Aug 2019 04:49:08 +0000 Sensorless twelve sectors implementation of neural DPC controlled DFIG for reactive and active powers ripples reduction http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/355 <p>A direct power control (DPC) drive allows independent and direct command of reactive power linkage and stator<br>active power by the selection of optimum inverter switching tables (STs) of an induction generator (IG). There is no<br>need for any complex conversion of voltage or current. However, each vector selected from the ST can not produce<br>the required accurate voltage vector to provide the desired active and reactive powers. This results in the production of<br>ripples in the reactive power as well as active power waveforms. In this study, we propose a technique to minimize<br>active and reactive powers fluctuations. In this proposed strategies, the circular flux vector is divided into 12 sectors of<br>30 degrees and is compared to each other. Switching table is based on neural networks controller. The proposed<br>strategies of 12 sectors DPC strategy are simulated and the comparison of their performances is presented.</p> Habib BENBOUHENNI ##submission.copyrightStatement## http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/355 Thu, 01 Aug 2019 04:50:36 +0000 A Novel Three Phase Five Level Inverter for Hybrid Solar –Wind Energy System http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/358 <p>At present, the whole world is going through a severe energy crisis due to the non replenish able nature of fossil fuels which are major sources of conventional energy. In addition to limited availability of conventional energy sources, they also contribute heavily towards environmental pollution.&nbsp; In this scenario, renewable energy sources has got significant role to play in meeting global energy demand. Solar and wind energy systems are the most popular types of grid connected renewable energy systems. &nbsp;We are presenting a new system configuration for interfacing the hybrid solar and wind energy system to the grid. This configuration is flexible and it allows these two renewable energy sources to supply the load together or independently depending upon their availability. The configuration proposed here uses a modified five-level inverter for converting DC voltage generated from renewable energy sources to AC voltage at desired frequency. The usage of five-level inverter reduces Total Harmonic Distortion (THD) in output voltage and helps in eliminating bulk filters required at the output side. Simulation study of the proposed system is carried out using MATLAB Simulink.</p> <p>&nbsp;</p> Simhadri Lakshmi Sirisha ##submission.copyrightStatement## http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/358 Thu, 01 Aug 2019 04:44:33 +0000 New Hybrid Five-Level Space Vector Modulation Strategy to Minimize Current Distortion and Power Ripple for a DFIG Controlled by NSOSMC Control http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/363 <p>This article proposes a new modulation strategy that can minimize the stator current distortion and powers ripples for a doubly fed induction generator (DFIG) controlled by neuro-second order sliding mode controller (NSOSMC). The proposed five-level space vector modulation (5L-SVM) strategy is a hybrid technique which consists of 5L-SVM strategy and the intelligence technique (neural networks (NNs) and Fuzzy logic controller (FLC)). The former provides low current distortion and reduce powers ripples. On the other hand, the NSOSMC method with classical 5L-SVM strategy gives more powers ripples and harmonic distortion of stator current. For the proposed techniques, in the simulation region of neural space vector modulation (NSVM) technique, fuzzy space vector modulation (FSVM) is used to reduce the stator current distortion and powers ripples. Comparison of simulation results derived from a Matlab/Simulink software based controlled inverter is included. The work demonstrates that using the proposed hybrid 5L-SVM strategy, the three-phase current signals of the inverter can be reconstructed even under very low modulation index range while providing a low current harmonic distortion of the five-level inverter output.</p> Habib BENBOUHENNI ##submission.copyrightStatement## http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/363 Thu, 29 Aug 2019 05:46:07 +0000 Optimal Placement of Mini Hydro and Capacitors using Water Cycle Algorithm in Distribution System http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/362 <p>Basic Reactive power compensation is provided by capacitor banks and active power compensation is provided by Distributed Generators (DGs) like, Solar, Wind and Mini-hydro power plants.&nbsp; For obtaining optimal placement of Mini Hydro Power Plants and capacitor banks Water Cycle Algorithm (WCA) is intended. The optimal sizes of Capacitors and DGs chosen are of continuous sizes.&nbsp;&nbsp; 33-Bus and 69-Bus radial&nbsp; distribution systems are chosen for testing this algorithm to identify potential locations and sizes of Mini hydro and capacitors.&nbsp;&nbsp; It is found that with the proposed WCA, maximum loss reduction of&nbsp; 79 % is obtained for 33 Bus system and 83.6% for 69 Bus system.&nbsp; Cost analysis is also presented with three different load levels along with above DGs and Capacitors. &nbsp;In addition to cost analysis, for the benefit of environment carbon emissions are also calculated and found that there is a reduction of 4,034.57 tons of CO<sub>2</sub> emission per year on 33 bus system and 4,607.88 tons of CO<sub>2</sub> emission per year on 69 bus system.&nbsp; It is proved that WCA offers highest loss reduction with minimum sizes of DGs and capacitors compared to any other algorithm available in the literature.&nbsp; The WCA is easy to implement and the search process is methodic.</p> Ajay Babu Bathula, K.V.S Ramachandra Murthy, K.V.S Ramachandra Murthy, Manyala Ramalinga Raju ##submission.copyrightStatement## http://journals.iaumajlesi.ac.ir/em/index/index.php/em/article/view/362 Thu, 29 Aug 2019 05:46:54 +0000