Browsing by Author "Oguz, Yuksel"
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Item Adaptive neuro-fuzzy inference system to improve the power quality of variable-speed wind power generation system(TUBITAK SCIENTIFIC \& TECHNICAL RESEARCH COUNCIL TURKEY, 2010-01-01) Oguz, Yuksel; Guney, IrfanIn this study, an adaptive neuro-fuzzy inference system is designed for output voltage and frequency control of a variable-speed wind power generation system. Variable-speed wind power generation systems (VSWPGS) provide the opportunity to capture more power than fixed speed turbines. On the other hand, the variable-speed wind turbine output can be variable voltage and variable frequency for fluctuating wind speeds. The quality of output power can be improved if adequate controls are incorporated in the system. To bring the output voltage and frequency of system by means of control of blade pitch angle of wind turbine to a desirable value, an adaptive neuro-fuzzy inference system (ANFIS) is used in this paper. Based on the dynamic performance of VSWPGS, ANFIS is designed. Control and dynamic performance analysis of VSWPGS is made depending on various loading situations. Dynamic modeling, control and simulation study of the wind power generation system is performed with MATLAB/Simulink program. The simulation results obtained through various load, situations and detailed analysis of so established simulation model is given in this study. As it can be seen in simulation results, the output voltage and frequency of ANFIS controlled variable-speed wind power generation system reach to desirable operation values in a very short time.Item Power Quality Control and Design of Power Converter for Variable-Speed Wind Energy Conversion System with Permanent-Magnet Synchronous Generator(HINDAWI LTD, 2013-01-01) Oguz, Yuksel; Guney, Irfan; Calik, HuseyinThe 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\%.