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Decarbonisation policies adopted worldwide are leading to an increasing deployment of renewable energy sources. In Europe, the growing number of offshore wind farm projects calls for scrutinising merits and opportunities of their interconnection via multi-terminal links rather than conventional point-to-point connections. The semiconductor components used in the converters and the resistance of power...
By applying new technologies of energy and DC distribution technology, the smart-grid based digital load device is increased. Due to the power conversion technology, the power consumption is minimized, maximize the utilization of self-development self-energy power consumption. Derive optimum efficiency power structure, and at the same time, the existing AC system with high quality bi-directional AC-DC...
Renewable energy sources have been an attraction for both researchers and scientists recently. In this study, a survey focused on renewable energy sources in Turkey has been presented. The survey has been conducted by researchers working in different scientific disciplines registered to Scientific and Technological Research Council of Turkey. The questionnaires have been prepared in order to explore...
Wind power has received much attention as the most widely used type of renewable energy because of its higher energy conversion efficiency than solar power. In addition to the large wind power turbines already in operation, small wind power turbines are also being developed to meet their increased demand in urban or rural areas. However, the efficiency of current operating small wind power turbines...
Inductive Power Transfer (IPT) has recently been proposed for application with Electric or Hybrid Electric Vehicles (EV/HEV), where a highly efficient system operation is demanded for the high-power transfer. Due to the high requirements on the regulation of the output power and the output voltage, and due to the large variations of the magnetic coupling, the control of these systems is a challenging...
This paper presents a real time operation of tap changing transformers and converters interfaced with distributed generators (DGs) in unbalanced three-phase distribution systems. The unbalanced three-phase power flow equations are solved using Newton Raphson method, and the three phase elements models are considered. Since the renewable energies are attracting worldwide attention, the DGs considered...
As a distributed generation system increases, a stable power supply becomes difficult. Thus control of power leveling (PL) unit is required to maintain the balance of power flow for irregular power generation. The unit is required to respond to change of voltage and bidirectional power flow. So the bidirectional buck/boost DC/DC converter is applied for the control of PL unit in this research. The...
The purpose of this paper is to show performance characteristics of the reference modification control dc-dc converter which uses neural network and model controls. In the presented method, the neural network controller is used to modify the reference in the proportional control term of the conventional PID control. The neural network controller is repeatedly trained using former predicted data to...
Sodium borohydride (NaBH4) is attractive as fuel for fuel cell hybrid electric vehicle (FCHEV) because of its high energy density. The authors have proposed and made a hydrogen generation system which uses sodium borohydride as fuel before now. However, as for this system, there has been a problem in the velocity of hydrogen generation under low-temperature water environment. This paper examined citric...
The worldwide increasing interests towards medium frequency high power transformers (MFHPTs) as a key element of high power converters in offshore wind farms and traction systems makes it a promising area of research. Since the electrical environment and excitations are different in these applications, conventional transformers are not applicable and hence new design procedures should be utilized...
Ni-nanowire array films were prepared by general galvanostatic electrodeposition employing a polycarbonate membrane filter (pore diameter: 0.1 µm or 0.8 µm) as a template and subsequent dissolution of the membrane filter in chloroform. Thereafter the Ni-nanowire array films were modified with Sn by pulsed electrodeposition. Morphology of Sn-modified Ni-nanowire array films obtained was largely dependent...
In this paper, an experimental application focused on energy quality observation is developed and power factor correction for the electrical power systems is simulated. The required parameters are obtained from the system by electronic cards and then transferred to the computer. As the controller a (DAQ) Data acquisition card is used and also a user-friendly interface is prepared for computing and...
The European Commission is supporting many projects intended to improve the use of renewable energy sources and a special attention has been devoted to the case of large-scale urban areas. The Polycity project represents a significant demonstration of this energy policy, which was applied to 3 cities: Barcelona, Stuttgart and Torino. The case of Torino appears of particular relevance because it is...
From the perspective of global warming suppression and depletion of energy resources, renewable energies, such as solar collector (SC) and photovoltaic generation (PV), are getting attention in distribution systems. Then, all electric houses with PV and HP are becoming widely used recently because of using time-of-day electricity rate system. If fixed battery can be introduced in the houses, the electricity...
Traditional houses consume electrical energy in AC form which is generated by thermal power plants or other energy sources that cause environmental pollution, CO2 emission and global warming. The most important parts of a green house are renewable energy sources like photovoltaic and wind based systems. In this work, our proposed green house generates electrical energy in DC form from photovoltaic...
A large number of tunnels in the world have been in service for several decades, and their health conditions deteriorate with the increasing service ages. Therefore, the effective inspection methods are essential to assess the health conditions of tunnels. The method of visual inspection has been commonly utilized to investigate the integrity of lining concrete; however, this method is incapable of...
Al loaded CaO catalysts for biodiesel synthesis were prepared with alkali co-precipitation method and investigated. The catalytic activities were examined with transesterification of triolein to oleic methyl ester (OME) as model reaction of biodiesel formation. The catalytic activity of these catalysts strongly depends on the amount of Al loading and formation of composite oxide phase on catalyst...
In this study, using concentrated solar energy more efficiently by spectral decomposition approach is introduced. The theoretical analysis is presented for decomposed as spectral concentrated solar radiation and then the potential utility of the system is discussed.
The application of transformers in offshore wind farms requires more consideration in the sense of reliability and protection than onshore ones due to the higher cost of accessibility and repair. Switching of offshore wind farms and lightning strikes are the main two transient phenomena which can lead to harmful damages to Wind Turbine Transformer (WTT) as well as other equipment. Thus, the frequency...
Fuel cell has a lot of advantages like zero emission, high efficiency, little noise, and extremely low vibration. So, it is considered as a suitable alternative source for the portable power supply. However, it needs to be made up for the weak points such as high cost and slow dynamic response. As a representative useful solution to remedy fuel cell's shortcomings, battery is being utilized in various...
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