Fikri Baris Uzunlar

Bio: Fikri Baris Uzunlar is an academic researcher from Istanbul Technical University. The author has contributed to research in topics: Wind power & Grid code. The author has an hindex of 2, co-authored 4 publications receiving 8 citations. Previous affiliations of Fikri Baris Uzunlar include Schneider Electric.

Wind turbine selection method by using analytical network process associated with cost benefit analysis

Abstract: Wind turbine evaluation is very crucial in the overall effectiveness of a wind project where the stakeholders are challenging for selection among very different wind turbines. Consequently, this study proposes a method which incorporates analytic network process and cost benefit analysis to choose appropriate turbines during development and investment of a wind plant. A case study is implemented for performance evaluation of various wind turbine types, determining the evaluation priority of factors for wind turbine selection and ranking the turbine performance with respect to key cost and natural parameters. Sensitivity analysis is studied to analyse the stability of method outputs to changes in parameter values. Cost benefit analysis of different turbines is carried out in terms of internal rate of return and net present value. Several scenarios of technical and economical input parameters are vital in order to examine turbine performance under different conditions since the importance of each parameter varies considerably depending on chosen turbine technology. It is aimed to highlight that even minor changes in these parameters may have a serious variation on decision making with no uniform criteria but a combination of indices is most preferable.

Grid Compliance and Power Quality Comparison of Wind Plants with Different Turbine and Grid Types

Abstract: In this paper, different grid integration and generators used for wind plants is compared by means of quality of the power generated in plant and impact to the power system. Annual energy production and cost of a given wind plant are basis of the comparison. Technical and economical values of different type wind turbine generators are quantitatively evaluated by providing necessary electrical and cost calculations. In technical examination, grid compliance of a 30 MW wind plant with 13 units of asynchronous geared type turbine is investigated by using power system analysis software as per Turkish Grid Code. Steady state conditions of the wind power plant are evaluated by calculating the reactive power capability, load flow and short circuit analysis at first part of the paper. Secondly, low voltage ride through capability, system frequency and voltage test of the wind park are assessed. Similarly, same plant is considered to be equipped with 3.0 MW direct drive type turbines and technical study repeated with different grid type by means of electrical balance of plant. Finally, levelized cost of electricity calculation is done to observe economic effect of plant parameters in order to obtain maximum wind energy.

Three dimensional grounding grid design

Abstract: This study presents an advanced methodology and a computer model for analysis of grounding systems conforming to standards IEEE Std 80-2000, IEEE Std 81- 1983 and IEEE Std 837-2002 The methodology and computer program is validated with actual system measurements The accuracy of computer algorithm is dependent on how well the soil model and physical layout reflect actual field conditions The tolerable voltage limits and the maximum predicted voltage values are calculated using empirical formula in given standard The step, touch and mesh voltages and hot zones are calculated according to the recommendations in given standard and the differences between them are investigated and clarified The simulations are carried out with the aim to verify the possibility of introducing some practical design criteria helpful for engineering applications Substation grounding grid design and analysis module is specially designed to help engineers optimize the design of new grids and reinforce existing grids, of any shape, by virtue of easy to use, built-in danger point evaluation facilities

Grid connection and power quality optimization of wind power plants

Abstract: This paper covers the integration of the wind turbines with the national grids which includes the quality of the power generated at the wind plants, the impact to the power systems and the details of connection systems. The system has been considered in detail together with PSS-E (Power System Simulation for Engineering) software program. The scope of the study consists of two parts: technical and economical. 30 MW Wind Power Plant consisting of 13 pieces of 2.3 MW asynchronous WTG of type 690 V, 50 Hz is investigated due to the grid compliance of WPP according to Turkish Grid Code for Wind Turbines (Annex 18) in technical part. Firstly, the reactive capability of the wind power plant and comparison of it with the requirements of the Grid Code is determined. Secondly, the low voltage right through (LVRT) capability of the wind park is assessed. Finally, the system frequency and voltage test shall be applied. In the economic section, by changing some of technical parameters, cost-benefit analysis of the economic impact will be made in order to get use of maximum wind potential that could be obtained.

Design of control unit in PMSG based small-scale wind turbine for power factor correction

Abstract: The aim of this paper is a design of the control unit leading accurately Wind Energy Conversion System (WECS) without occurring any fault. Permanent magnet synchronous generator (PMSG) was considered as generator to create efficient electrical energy without using gear-box. In practice, variable wind speeds make the frequency at the generator output variable due to the lack of gear-box. For this reason, frequency regulation is compulsory for devices that are adapted to the standard operating frequencies regarding countries transmission lines. In addition, harmonic distortions occur at high levels in areas where nonlinear elements are present. Certain topological requirements are needed to overcome these distortions, and the aim of this paper is to distort as much as possible and not to reflect variable frequencies to the consumers and distribution networks. In this way, micro grids and independent sources known as islanded mode are being examined. Therefore, the signals obtained at the output of the PMSG are rectified first passed through the active filter as well and then to get the desired power factor and the reduced harmonics, DC chopper is used and then the output is obtained with the aid of an inverter. When these processes are carried out, various control methods have to he applied. Therefore, this paper deal with to control this system easily with benefit from various algorithms and to provide qualified energy.

The Influence of Moisture and Temperature on the Behavior of Soil Resistivity in Earthing Design Using Finite Element Method

Abstract: Protection of equipment, safety of persons and continuity of power supply are the main objectives of the grounding system. For its accurate design, it is essential to determine the potential distribution on the earth surface and the equivalent resistance of the system. The knowledge of such parameters allows checking the security offered by the grounding system when there is a failure in the power systems.A new method to design an earthing systems using Finite Element Method (FEM) is presented in this article.In this approach, the influence of the moisture and temperature on the behavior of soil resistivity are considered in EARTHING system DESIGN. The earthing system is considered to be a rod electrode and a plate type electrode buried vertically in the ground.The resistance of the system which is a very important factor in the design process is calculated using Finite Element Method. Finite Element Method is used to estimate the solution of the partial differential equation that governs the system behavior. COMSOL Multiphysics 4.4 which is one of the packages that work with the FEM is used as a tool in this design.Finally the values of the resistance obtained by COMSOL Multiphysics are compared with the proven analytical formula values for the ground resistance, in order to prove the work done with COMSOL Multiphysics.

Optimization of Grounding Grids Design for a Square-Shaped Mesh

Abstract: The basic configuration of a grounding grid, normally square or rectangular shape, is constituted by metallic conductors and rods forming two-dimensional grids So, from the point of view of the safety of the people and equipment, the grounding grid is the most important part of an electrical system When the grid is constituted by meshes and ground rods, the ground rods are only effective if a significant number is designed to maintain all the electrical system in the same potential Therefore, the objective of this work is an optimization of grounding grids design, in order to maintain satisfactory performance and be able to safeguard the surroundings of the grounded installations This paper describes experimental results for a square-shaped mesh

Economic Design of Substation Grounding Grid using ETAP Software: A Case Study of 2 x 500 MVA Galang Substation

Abstract: Substation grounding purpose is to secure the safety of personal that are in the vicinity and provide protection of the equipment when short circuit faults. The grounding grid design is an important factor in a substation for fulfilling standard requirements formulated by IEEE Std. 80. Commonly, substation grounding is grid configuration or combination of grid and rod. This study is designing a substation economically by considering the length of rod conductor used. Some grid configuration models were used for analyzing viz. rectangular shape, T-shape and L-shape. The models were compared with the existing design in the Galang substation for finding the minimum conductor length. The grid grounding of the Galang substation is the rectangular shape. By using ETAP package software, the important parameters in design substations such as step voltage, touch voltage for 50 kg body weight can be obtained. The parameters must fulfill the IEEE std. 80-2013 as a safety requirement for designing of the substation. From various configurations were applied, all the shapes models meet the IEEE Std. 80, but T-shape is the most economical design based on the conductor length used.