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Öğe A modified ABC algorithm approach for power system harmonic estimation problems(Elsevier Ltd, 2018) Kabalci Y.; Kockanat S.; Kabalci E.Electrical harmonic is an important issue on power quality of electrical systems. Therefore, estimation of power harmonics are essential to design filters to be utilized in electrical power systems for reducing harmonics and their effects on the electrical power systems. In this study, a power system harmonic estimation solution based on modified artificial bee colony (MABC) algorithm have been proposed. The proposed method in this study is different from other hybrid techniques previously reported ones since estimation processes are mainly focused on decreasing computational complexity and time. In order to provide more accurate and comprehensive estimation results for the proposed method, two different experiments are investigated. Obtained results by the performed experiments showed that the proposed harmonic estimator provides several advantages such as offering very low computational time, more accurate estimation of amplitude and phase values for all conditions and low complexity. © 2017 Elsevier B.V.Öğe Hybrid Microgrid System Design with Renewable Energy Sources(Institute of Electrical and Electronics Engineers Inc., 2018) Kabalci E.; Irgan H.; Kabalci Y.This study presents both a hybrid microgrid system design with renewable energy and their control methods, analysis result. This renewable energy resources (RES) consist of 33kW PVs, 100kW fuel cell stack and a 50kW wind turbine with permanent magnet synchronous generator (PMSG). PV plant includes the PV arrays and DC-DC boost converter. Fuel cell plant includes the fuel cell stacks and DC-DC boost converter. The wind energy plant contains the wind turbine, PMSG, uncontrolled rectifier and DC-DC boost converter. The boost converter connected to PV plant has been controlled by using incremental conductance maximum power point tracking algorithm (IC-MPPT A). Both the boost converters of the wind energy system and fuel cell system have been operated with PI controllers. The switching element of all boost converters is M OSFE T. The switching frequency for boost converters of the wind energy system and fuel cell system is 30 kHz and 50 kHz for boost converter connected PV array. The hybrid microgrid has been coupled on 1000V DC-bus bar. 400V/120 kV transformer and 120 kV, 50 Hz AC supply have been used to create the grid model. To convert from DC to AC, as the topology, full bridge inverter circuit has been used and IGBT has selected as the switching element. Phase locked loop (PLL) algorithm has been used as a control for the AC voltage generated at the inverter output to be the same phase, frequency and amplitude with the grid. The system has been operated under the various operating conditions such as wind speed and solar irradiation. And despite these variables, the desired results have been obtained from the system. © 2018 IEEE.Öğe Multi-channel power line communication system design for hybrid renewables(2013) Kabalci E.; Kabalci Y.This study deals with a multi-channel power line communication infrastructure that is designed specifically for a hybrid renewable energy generation system. However, the proposed method can easily be adapted to any communication system that uses power line as a transmission channel. The modelled environment is based on carrying the various data acquired from a renewable energy test bed. The test bed is also a comprehensive modelling study itself where it is designed with wind turbine and solar energy plants. The generated voltage, current, and apparent power (S) of each energy plant are measured separately and are transmitted to monitoring centre over the power line. The modulators are located at the generation sites and acquired data are modulated with Quadrature Phase Shift Keying (QPSK) method. A QPSK modulated signal that carries 6-channel data is injected to power line and is transmitted to 25 km away monitoring centre. The demodulated data is calibrated to measured values and comparisons showed that the proposed system performs multi-channel power line communication successfully. The modelled communication system can also be used as a control system by transmitting any control data from grid side to renewables. © 2013 IEEE.Öğe Noise insensitive optimal harmonic estimator design with lightning search algorithm(Elsevier B.V., 2019) Kabalci Y.; Kabalci E.Electrical harmonics directly affect the power quality of electrical systems. In order to improve power quality of electrical systems, accurate estimation of electrical harmonics is crucial and essential. This paper presents a novel estimator design approach for harmonic estimation problems. The proposed harmonic estimator is based on lightning search algorithm (LSA) that is a powerful metaheuristic optimization method inspired of natural phenomenon of lightning. The performance of designed estimator has been comprehensively analyzed by considering time varying power signals that contain two well-known estimation problems in the literature. In addition, each of these problems are examined for three different levels of noise. Furthermore, performance of the designed estimator is compared with the previously reported estimators. The achieved estimation results for different case studies clearly indicated that the proposed LSA based harmonic estimator provides better estimation results in all experiments than that of our previous method based on modified artificial bee colony (MABC) optimization and other existing methods available in the literature. © 2019 Elsevier B.V.
