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October 2005 - present
October 2005 - November 2015
Publications
Publications (23)
Reactive power and harmonic current compensation are considered as two important issues in the electrical power system since they have the strong impact on real power loss, voltage stability, resonance and operation cost. With recent development and deployment of distributed and renewable energy (power electronic converter interfaced) recourses the...
The breakdown strength and electron mobility of gallium nitride (GaN) are almost ten and three times higher than those of the silicon devices. Wide band-gap devices have a higher thermal conductivity, higher switching frequency capability, lower on-state resistance and lower power dissipation. Detailed analytical models in the electrical network an...
In photovoltaic (PV) systems, the environmental factors change the instantaneous electrical power available from the PV panel. A maximum power point tracking (MPTT) algorithm can be implemented to search the maximum power point on the voltage-current characteristic of the PV panel. Power electronic converters are used to transfer this maximum power...
This invention is related to a single phase inverter which enables converting the direct current voltage to alternating current voltage, allowing the energy obtained from photovoltaic (PV) panels to be transferred to the voltage of the grid, connecting to the grid voltage without using a transformer, keeping the leakage current below the standards...
This paper presents the realization of communication process between the digital signal processing unit and the MATLAB/Simulink during the simulation of power converter with its controller. The application of the hardware in the loop is of great importance for the designer to estimate the effect of digital signal processing unit on the controller r...
In low power applications of photovoltaic (PV) systems, the transformerless grid-connected inverters have been preferred to increase the efficiency and reduce the cost, size and power losses when they are compared to the ones with the transformer. A transformerless single-phase inverter topology with a single DC link capacitor for the grid-connecte...
This paper presents a control algorithm and its implementation on a grid connected single phase multilevel U-cell converter for reactive power control. The sinusoidal pulse width modulation is used for the control of five-level voltage source converter. The phase angle of grid voltage is obtained by using a single-phase phase-locked loop and two mo...
Abstract-The purpose of this paper is to estimate the efficiency of the inverter circuits used for the Photovoltaic (PV) systems. The analysis of a power electronics converter with the SPICE during the steady-state operation takes a long time and the results may not be obtained accurately due to convergence problem in the solver. The MATLAB package...
In this paper, five-level Static Synchronous Compensator (STATCOM) is analyzed with reduced number of power switches. The simulation has been performed by using a digital signal processing unit (DSP) and Matlab/Simulink together. Selective harmonic elimination, single phase real (P) and reactive (Q) power methods are used to control power flow in t...
tIn this paper, a 3-phase, delta-connected, 5-level Static Synchronous Compensator with a novel AC toDC converter is analyzed and implemented for load balancing in three-phase systems. The level shiftedcarrier based sinusoidal pulse width modulation (SPWM) method is used as the switching technique.This converter has less number of power switches th...
This paper presents state space model of singlephase
STATCOM based on continues switching function.
Continues switching functions for bipolar voltage source inverter
(VSI) have been used to derive the transfer function for complete
controller. Two proportional integral (PI) controllers which are a
DC PI for DC link voltage control and an AC PI for...
In this paper single-phase instantaneous reactive power (p-q) method and non-active current method have been compared. Reactive power and reactive current calculation using these methods have been considered here under distorted voltage and current waveforms. It has been shown that these two methods have some limitations for reactive power compensa...
This paper presents state space model of single-phase STATCOM based on continues switching function. Continues switching functions for bipolar voltage source inverter (VSI) have been used to derive the transfer function for complete controller. Two proportional integral (PI) controllers which are a DC PI for DC link voltage control and an AC PI for...
In this paper, a three-phase, Y-connected, five-level static synchronous compensator with reduced number of switches is proposed for single phase and unbalanced three-phase loads. The level shifted carrier based sinusoidal pulse width modulation method is used for switching. The active and reactive powers demanded by the load are estimated for each...
In this paper, a 3-phase, V-connected, 5-level Static Synchronous Compensator (STATCOM) is proposed with reduced number of switches for single phase and unbalanced three-phase loads. The system is implemented and tested under different loading conditions. The level shifted carrier based SPWM method, instantaneous single phase active (P) and reactiv...
In this paper, PSPICE analysis and design of grid connected multilevel converter will be presented. This converter has all the features of H-bridge structure, while it has six semiconductor switches and drivers to produce five-level output voltage. Reduction of IGBTs and drivers decreases the converter losses and system cost. The PSPICE analysis is...
In this paper, multi-level cascaded Static Synchronous Compensator (STATCOM) is proposed using a novel converter having reduced number of switches. STATCOM is analyzed by using DSP and Matlab, interactively. The level shifted carrier based SPWM method, instantaneous single phase active (P) and reactive (Q) power algorithms are applied to control th...
7 level cascaded voltage source inverter structure is presented as Static Synchronous Compensator (STATCOM). Selective harmonic elimination method, synchronous reference frame instantaneous reactive power theory method is applied. DC link capacitors voltage control algorithm is also used. Performance of STATCOM is examined in instantaneous load cha...
7 level cascaded voltage source inverter structure is presented as Static Synchronous Compensator (STATCOM). Selective harmonic elimination method, synchronous reference frame instantaneous reactive power theory [1] method is applied. DC link capacitors voltage control algorithm is also used. Performance of STATCOM is examined in instantaneous load...
Güç elektroniği uygulamaları, genel olarak yarı iletkenleri de içeren güç elektroniği devre elemanları ve denetleyici ile onun yazılımından oluşmaktadır. Bir güç elektroniği uygulamasının prototipi hazırlanırken denetleyicinin programında oluşan hatalar güç sisteminin devre elemanlarına zarar verebilmektedir. Bu çalışmada, bir sayısal işaret işlemc...
In this work, two types of slip ring induction machine drives are compared due to their stator current harmonics. These systems are used with drive circuit at rotor terminals in the wind energy conversion systems (WECS). The power quality constraints subjected to the WECS cover the limitation of injected current harmonics to the power system. There...
This paper presents simulation results and power quality measurements of a wind farm. The wound rotor induction generator at 600kW is employed for power conversion in the wind energy conversion system (WECS). This induction machine is connected to the drive circuit via rotor terminals and speed control is carried out by means of chopper circuit. Th...