Irfan Guney

Power quality control and design of power converter for variable-speed wind energy conversion system with permanent-magnet synchronous generator.

The control strategy and design of an AC/DC/AC IGBT-PMW power converter for PMSG-based variable-speed wind energy conversion systems (VSWECS) operation in grid/load-connected mode are presented. VSWECS consists of a PMSG connected to a AC-DC IGBT-based PWM rectifier and a DC/AC IGBT-based PWM inverter with LCL filter. In VSWECS, AC/DC/AC power converter is employed to convert the variable frequency variable speed generator output to the fixed frequency fixed voltage grid. The DC/AC power conversion has been managed out using adaptive neurofuzzy controlled inverter located at the output of controlled AC/DC IGBT-based PWM rectifier. In this study, the dynamic performance and power quality of the proposed power converter connected to the grid/load by output LCL filter is focused on. Dynamic modeling and control of the VSWECS with the proposed power converter is performed by using MATLAB/Simulink. Simulation results show that the output voltage, power, and frequency of VSWECS reach to desirable operation values in a very short time. In addition, when PMSG based VSWECS works continuously with the 4.5 kHz switching frequency, the THD rate of voltage in the load terminal is 0.00672%.

Modeling of hybrid wind‐gas power generation system and adaptive neuro‐fuzzy controller to improve the system performance

In this study, dynamic modeling of the hybrid wind‐gas power generation system (HWGPGS) is realized by using the MATLAB/Simulink program for purpose of meeting the electric energy needs of small settlement units far from city centers or energy distribution networks. Besides, Adaptive Neuro‐Fuzzy Inference System (ANFIS) is used to ensure electrical output magnitudes of the hybrid power generation system at a desired operating performance. The components that build up the hybrid power generation system and its functions in the system are explained. In case the HWGPGS is loaded with different consumer loads, analysis of electrical magnitudes of the system is made through simulation results. As it can be seen from the results of simulation study realized for the hybrid power generation system, output electrical magnitudes of the ANFIS controlled system reach to desired operating values in a short time.

Fault detection in induction motors with independent component analysis (ICA)

In this study, the aim is to detect an induction motors winding faults by using independent component analysis (ICA). Many laboratory experiments have been done on an induction motor to check the performance of the proposed method. The phase currents of the induction motor are used in the fault detection algorithm. The algorithm is implemente d by using MATLAB. The proposed method is compared to FFT solution to see its ability to distinguish fault currents. It has been observed that the proposed method based on ICA can efficiently be used to detect induction motors winding faults.

Educational Software for Power System Analysis

This paper presents educational software that has an unconventional structure and friendly interface and can be used in computer-aided analysis of power systems. The software provides effective and fast solutions to in-line modeling of power systems, failure and power flow analyses. In addition, students using this software can demonstrate their own models and follow the solution steps in detail. The software also presents educational details and graphical mediums, similar to solutions provided by software developed for professional use. For this reason, it has a form that can be used in a workshop environment and distance learning activities.

Cost Calculation Algorithm for Photovoltaic Systems

The electric energy is directly correlated with vital elements for countries of today’s world. These elements can be divided into four sub-titles of production, national income, health and education. It is almost impossible for countries that lack of electric energy to ensure positive developments in such parameters. It is known that, even these days, at least 1.6-2 million people not to consume electricity in the world. Besides, in some countries, there exist great differences between the poor and the rich in obtaining energy (Belfkira et al., 2008). In that situation, the most benefit in the future of electricity generation sources, expected to be renewable energy sources especially solar and wind. It is also expected that the technical, economic, social and political barriers of widespread use of these resources will decline over time and these resources will own a very important share in the production of electricity at the end of this century. In this chapter, features of sustainable energy production and sustainability parameters of photovoltaic (PV) systems are summarized. This chapter focused on a life cycle cost analysis (LCCA) method that used in PV system design. In this point, apart from conventional cost analysis, calculable “external costs and benefits” are taken into account. In addition, effect of the capacity utilization (CU) on unit energy cost is explained particularly in stand-alone PV systems. Thus, detailed analysis of life cycle and unit energy costs -which the most disadvantaged parameter of PV within the parameters of sustainabilitywas, carried out. The topics discussed are supported with sample applications at the end of chapter.

A new transformer hysteresis model in MATLAB™ Simulink

This paper, which is an extended version of Referenced paper[1], presents a new transformer model displaying hysteresis using MATLAB™ Simulink environment. The proposed model displays a complete scheme for the simulation of three phase transformers. The new model is mainly based on transmission line model (TLM) of power system using lumped parameters. The developed model is particularly suitable for the fault analysis and protective relaying studies under harmonic conditions where the transformer is driven into the nonlinear regime.1234