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Smart Grid and Renewable Energy 2012年第1期3卷 43-50页

作者： faten hosney fahmy Ninet Mohamed Ahmed Hanaa Mohamed Farghally Electronics Research Institute Giza Egypt.

The main objective of this work is to design an optimal—efficient economic power renewable energy system that feeds the required electric load of a small scale brackish reverse osmosis desalination unit and a tourism motel located in Hurghada, Egypt. Four renewable energy power systems are presented in this paper to select the most optimum one of them. These suggested renewable energy systems are PV-wind hybrid system, stand-alone wind system, stand-alone photovoltaic system and PV-wind-fuel cell hybrid system. The sizing, optimization and economic estimation of the proposed systems were performed using HOMER software. HOMER solves the optimization problem to minimize the global cost and provides the optimum wind turbine, PV, battery and fuel cell ratings. In addition, a comparison between the four different suggested power system configurations is illustrated in details. PV-wind hybrid system realized the lowest net present cost and levelized cost of energy. Also, this system was able to provide energy approximately all the day. The battery state of charge varies between 83% and 99% and it was found that, the PV-wind hybrid system is more suitable than the others for the selected site and the suggested electrical load.

关键词： PV Wind Turbine Fuel Cell Hybrid System Net Present Cost HOMER

Modeling and Simulation of Evaporative Cooling System in Controlled Environment Greenhouse

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Smart Grid and Renewable Energy 2012年第1期3卷 67-71页

作者： faten hosney fahmy Hanaa Mohamed Farghally Ninet Mohamed Ahmed A. A. Nafeh Electronics Research Institute Giza Egypt.

Greenhouses are used for the main purpose of improving the environmental conditions in which plants are grown. There are many parameters can affect the growing of plants inside greenhouse, such as air temperature and relative humidity. The adjustment of these parameters is achieved by selecting appropriate control actions. This work proposes a controlling technique for greenhouse indoor temperature and relative humidity. The proposed greenhouse cooling system temperature controller is designed to adjust the air volume flow rate in pad-fan cooling system to fix the greenhouse indoor temperature at 20?C and 70% relative humidity. The designed control technique is realized to ensure the required and continuous operation of the greenhouse. Moreover, this work present, a complete mathematical modeling and simulation of cooling system is introduced. In addition, a computer model based on MATLAB SIMULINK software has been used to predict the temperature and relative humidity profiles inside the greenhouse. The results are realized the requirements of the greenhouse cooling system environment.

关键词： Pad-Fan Evaporative Cooling System PI Controller and Greenhouse

Sizing and Design of the PV-WIND Energy Dryer for Medical Herbs

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Smart Grid and Renewable Energy 2013年第2期4卷 217-226页

作者： Emad Ahmed Sweelem Abdel-Shafy A. Nafeh faten Hosny fahmy PV Cells Department Electronics Research Institute Cairo Egypt

Medical herbs are located in Egypt in different areas and they are very important to increase the national income of Egypt. It is necessary to dry the herbs in their growing locations. As the growing locations are located far from the natural supply grid of Egypt, renewable energy sources such as PV&WIND are preferably utilized to achieve the drying process. Moreover, since the drying process is actually used to remove water from the herbs, thus it can preserve the herbs in storage drastically by preventing the attack of microorganisms during the moist conditions of herbs and also reduce their weight and bulk (for cheaper transport). Where, this paper selects, at first, the suitable drying site, and then it suggests. The suggested drying system is completely designed, and includes the following three systems: the solar thermal system, the dryer, and the renewable energy system.

关键词： Medical Herbs Dryer Solar Thermal System Renewable Energy

Modeling and Simulation of a Renewable Energy Based-Medical Herb Dryer

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Smart Grid and Renewable Energy 2013年第2期4卷 144-152页

作者： Abdel-Shafy A. Nafeh Emad Ahmed Sweelem faten Hosny fahmy PV Cells Department Electronics Research Institute Cairo Egypt.

The medical herbs should be dried directly after harvesting, otherwise, insects and fungi spoilage them. Conventional drying methods such as open sun drying and conventional fuel dryers are not suitable, since they contaminate the herbs, decrease the drying efficiency and at the same time increase the drying cost. Therefore, the recent trend is toward the harnessing the renewable energy to dry the medical herbs. This paper presents a new controlled drying system, which uses a solar collector and an electric heater to heat the drying air, and a PV-WIND hybrid system to supply the required electric energy to the dryer electric load. This paper also presents the dynamic modeling, simulation, and control of the suggested thermal system (i.e., the solar thermal system and the electrical heater). Moreover, this paper, exhibits the different results of the thermal system, to check the effectiveness of this system that fulfills the requirements of the drying operation. The system results are found to satisfy the ultimate goals of the drying operation.

关键词： Medical Herb Dryer Solar Thermal System Renewable Energy Dynamic Modeling

Temperature Control in a PV-WIND Medical Herb Dryer System

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Smart Grid and Renewable Energy 2013年第2期4卷 153-160页

作者： Abdel-Shafy A. Nafeh Emad Ahmed Sweelem faten Hosny fahmy PV Cells Department Electronics Research Institute Cairo Egypt.

This paper introduces a temperature control technique for a medical herb dryer system. The technique fixes the drying temperature of the medical herbs at 40℃ even in cases of rapidly changing atmospheric conditions. The control of the dryer temperature is achieved through using on/off controller. The designed dryer contains two systems, which are the thermal and electrical systems. The thermal system is designed to heat the drying air by using solar water collector and electric heater. While, the electrical system which contains a photovoltaic (PV)-WIND hybrid system is used to feed the different electrical loads of the dryer system. The control technique is investigated through simulation work by using MATLAB-SIMULINK. The simulation results indicate the high capability of the proposed technique in controlling the drying temperature, even in case of rapidly changing atmospheric conditions.

关键词： Medical Herb Dryer Solar Thermal System PV-WIND System On/Off Controller

Solar Thermal Aquaculture System Controller Based on Artificial Neural Network

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Engineering（科研） 2011年第8期3卷 815-822页

作者： Doaa M Atia faten H fahmy Ninet M Ahmed Hassen T Dorrah 不详

Temperature is one of the most principle factors affects aquaculture system. The water temperature is very important parameter for shrimp growth. It can cause stress and mortality or superior environment for growth and reproduction. The required temperature for optimal growth is 34oC, if temperature increase up to 38oC it causes death of the shrimp, so it is important to control water temperature. Solar thermal water heating system is designed to supply an aquaculture pond with the required hot water in Mersa Matruh in Egypt as presented in this paper. This paper introduces a complete mathematical modeling and MATLAB SIMULINK model for the solar thermal aquaculture system. Moreover the paper presents the control of pond water temperature using artificial intelligence technique. Neural networks are massively parallel processors that have the ability to learn patterns through a training experience. Because of this feature, they are often well suited for modeling complex and non-linear processes such as those commonly found in the heating system. They have been used to solve complicated practical problems. The simulation results indicate that, the control unit success in keeping water temperature constant at the desired temperature by controlling the hot water flow rate.

关键词： Aquaculture Forced Circulation Hot Water System Artificial Neural Networks

Maximum Power Point Tracking of Hybrid Tidal Current—Supercapacitor Energy Conversion System

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Journal of Power and Energy Engineering 2016年第4期4卷 35-44页

作者： Marwa M. Elzalabani faten H. fahmy Abd El-Shafy A. Nafeh Gaber Allam Electronics Research Institute (ERI) Cairo Egypt Faculty of Electronic Engineering Menoufia University Al Minufya Egypt

This paper proposes control of maximum power tracking system of tidal current energy system. A permanent magnet synchronous generator (PMSG) works as a variable speed generator in the proposed energy system. A controller was applied to achieve the maximum power control of tidal current turbine on a wide range of water current speed change. A dynamic model and simulation of the energy system coupled with current change are presented. The measured DC voltage and DC current are used to determine the position of maximum power point that controls the DC/DC boost converter duty cycle depending on the Hill Climb Search (HCS) algorithm. This algorithm doesn’t require any information or measurements about current’s speed change or generator’s characteristics. A supercapacitor added to fix the load voltage despite of tidal current speed or load variations. Simulation results show the effectiveness of the controller proposed system.

关键词： Tidal Current Energy PMSG MPPT HCS Boost Converter Supercapacitor Bidirectional Converter

Fuzzy P &O Maximum Power Point Tracking Algorithm for a Stand-Alone Photovoltaic System Feeding Hybrid Loads

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Smart Grid and Renewable Energy 2014年第2期5卷 19-30页

作者： Sahar M. Sadek faten H. fahmy Abd El-Shafy A. Nafeh Mohamed Abu El-Magd Electronics Research Institute National Research Center Building Cairo Egypt Faculty of Engineering Cairo University Cairo Egypt.

The photovoltaic (PV) generator exhibits a nonlinear current-voltage (I-V) characteristic that its maximum power point (MPP) varies with solar insolation. In this paper, a maximum power point tracking (MPPT) method using fuzzy logic control (FLC) is presented. This method is based on the concept of perturbation and observation (P & O) algorithm to track the MPP of a stand-alone PV system. The controller is used to maximize the power generated by the PV array and the simulation of the system is implemented in MATLAB. Simulation results are compared with those obtained by the conventional P & O controller. Results show that the FLC gives better and more reliable control for the stand-alone PV system feeding hybrid loads.

关键词： PV MPPT Fuzzy Controller DC & AC Loads

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红海地区潮汐能系统的优化运行和数学模型

国外大电机 2016年第2期 57-59页

作者： faten H.fahmy 刘向海不详中国计量学院

水力发电是一种可再生能源，与其他任何时候相比，它在20世纪对人们的生活有着更大的影响。如今电力的奇妙已成为日常生活中的一部分，水力发电在其中发挥着重要作用，同时促进了工业的发展。潮汐发电是利用水能的一种方式。由于大量的... 详细信息

水力发电是一种可再生能源，与其他任何时候相比，它在20世纪对人们的生活有着更大的影响。如今电力的奇妙已成为日常生活中的一部分，水力发电在其中发挥着重要作用，同时促进了工业的发展。潮汐发电是利用水能的一种方式。由于大量的能量被储存在潮汐中，本文提出了一种潮汐电站的设计，能够利用埃及红海中大量的潮汐能来发电。值得注意的是潮汐技术对于治理海洋潮汐、经济和环境问题是一项新的先进技术。同时，为边远地区建造小型潮汐发电机（1～10W）提供了机会。这项工作提出了一个新的想法，就是根据红海潮汐的性质产生有限的电能。本文潮汐系统的设计可以给海滩附近的有限直流负载馈电。直流负载为海滩旁边的直流照明。同时，解决了优化控制问题，从而使潮汐发电扩充影响系统的参数运行在最佳值。本文研究了一种我们必须考虑的可再生能源，它是一种经济的、环保的能源，从而受到极大的关注。

关键词：潮汐能最优化随机问题数学模型