Servet Tuncer

Design and implementation of an integrated environment for real‐time control of power electronic systems

In this article, an integrated lab environment for the electrical engineering education is presented which includes hardware and software for the modeling, simulation and control of multilevel inverters. A five‐level cascade inverter is designed and implemented which is an educational platform for the students to test different pulse width modulation (PWM) techniques and verify simulation results. The integrated environment is based on Matlab together with dSPACE. Sinusoidal PWM (SPWM) and Selected Harmonic Elimination PWM (SHEPWM) blocks are constructed in Matlab/Simulink and converted to C code using Matlab/Real‐Time Workshop. C codes are sent to dSPACEs DS1103 digital signal processor (DSP) via dSPACE/Real‐Time Interface software. Voltages with variable frequency and amplitude obtained from SPWM and SHEPWM techniques are applied to an induction motor. Simulation and experimental results are visualized on the designed graphical user interface (GUI). The GUI is developed using dSPACEs ControlDesk software.

An application of SHEPWM technique in a cascade multilevel inverter

Purpose – In this paper, a new application of the Selected Harmonic Elimination Pulse Width Modulation (SHEPWM) technique used in the cascade multilevel inverter topology which is formed by series connections of one‐phase bridge type inverters (H‐bridge) is introduced. The advantage of the SHEPWM technique is its ability to operate in low switching frequency that makes it suitable for high power applications.Design/methodology/approach – First, the switching angles are calculated using constrained optimization technique. By using these switching angles, the fundamental harmonic can be controlled and the selected harmonics can be eliminated. Then, using these calculated switching angles, a set of equation is formed which calculate the switching angles with respect to the modulation index. The switching angles at any modulation index can be easily obtained by solving the equation set. In this study, this equation set has been solved online using dSPACE DS1103 controller board. Using this technique, three‐ph...

An educational tool for fundamental DC–DC converter circuits and active power factor correction applications

Computer‐aided education has become popular thanks to its flexible and useful structure in classroom environment. In this study, a computer‐based educational tool for DC–DC converters and its active power factor correction (PFC) applications are presented for effective education of these circuits at power electronics courses and reinforcement of the theoretical instruction given at these courses. Firstly, simulations were generated by MATLAB/Simulink toolbox. After then, graphical user interfaces (GUIs) were designed for visual approach to specifying all input and output parameters. The results of the educational tool developed are illustrated with screenshots and graphics.

Adaptive neuro‐fuzzy current control for multilevel inverter fed induction motor

Purpose – The paper aims to propose an adaptive and robust on‐line trained neuro‐fuzzy current controller based on indirect field oriented control (IFOC) for the current control of multilevel inverter fed induction motor (IM).Design/methodology/approach – Torque current of IM is controlled with Sugeno type neuro‐fuzzy controller (NFC) which has the ability of self tuning against parameter variations and load disturbance. Input variables of the neuro‐fuzzy current controller are chosen error and integral of error in order to eliminate steady state error. The consequent parameters of neuro‐fuzzy current controller are trained on‐line through backpropagation learning algorithm.Findings – The validity of proposed current control algorithm is shown with experimental results carried out under different speed commands, parameter variations and load disturbances. The experimental results show that control performance of NFC in the current control of IMs is satisfactory because of its adaptive and robust structure...

Three-level Cascaded Inverter Based D-STATCOM Using Decoupled Indirect Current Control

Abstract In this paper, experimental setup of three-level cascaded inverter based 380V/±25kVAR D-STATCOM using decoupled indirect current control method (DICC) is realized. AC and DC side of D- STATCOM is modelled in dq-axis on account of D-STATCOM’s controlling. DICC is used for control of D-STATCOM’s dq-axis currents independently. Gate pulses for inverter are generated with multilevel sinusoidal pulse width modulation (SPWM) technique. In this study, controller card used for signal processing is dSPACEs DS1103. The control algorithm is prepared by the help of MATLAB/ Simulink® software. This algorithm is converted to C language by using Matlab/Real-Time Workshop and downloaded to DS1103’s program memory by dSPACE/Real-Time Interface. Implemented experimental setup is tested by changing reference reactive current (iqref) +20A to −20A and obtained results from this test are given.

A new integrated education environment for induction motor drives

This paper presents an integrated education environment (IEE) developed for field‐oriented controlled induction motor (IM). This educational environment helps students to develop knowledge about field‐oriented control algorithms for IM through the study of analysis and design. It also increases the effectiveness of the teaching of subjects. The control of IM using field‐orientation methods is implemented on the DS1103 controller board from dSPACE. In the proposed IEE, the controller gains and other numerical parameters such as speed reference and d‐axis current reference, etc. are easily adjusted through the developed graphical user interface (GUI) in dSPACEs ControlDesk environment. The output voltage and current waveforms and their harmonic spectra can be shown on the developed GUI and can also be stored as a MAT file.

A Novel Power Factor Correction System Based on Sliding Mode Fuzzy Control

Abstract In this study, a novel Power Factor Correction System based on Sliding Mode Fuzzy Control is presented. This structure is used as an AC/DC/AC drive system for asynchronous machine. Non-sinusoidal source current of the system is improved to a sinusoidal waveform by the novel Power Factor Correction System controlled by Sliding Mode Fuzzy Controller. Sliding mode control technique (variable structure control) is preferred because of its robustness. Additionally, fuzzy control algorithm is adapted to Sliding Mode Control for eliminating or reducing chattering problem. A DC–DC boost converter is used to provide DC-link voltage to the inverter Three-phase voltages for Space Vector Pulse Width Modulation technique are represented by a voltage space vector in α-β space using the Clarke transformation for two-level voltage source inverter. The harmonic performance of the AC/DC/AC drive system, source side and load side current waveforms, and total harmonic distortion (THD) values are given in figures. Experimental results show the significant improvement in source current with eliminated harmonics and increased power factor from 0.63 to 0.998 value.

ÇOK SEVİYELİ KASKA.D İNVERTERLERDE SPWM TEKNİGİNİN KULIJANIIVII

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