Mustafa Ergin Şahin

A novel filter compensation scheme for single phase- self-excited induction generator micro wind generation system

The paper presents a novel flexible alternating current transmission system (FACTS) based stabilization scheme developed by the second author for use in small scale residential/commercial micro grid (wind-induction generator) utilization schemes in the range 5 to 50 kVA, for stabilized efficient renewable wind utilization. The novel FACTS stabilization scheme is fully validated using Matlab/Simulink for small scale residential and commercial electric loads. The use of three-phase induction generator ensures both efficient utilization, improved power factor operation of the single phase-self excited operation of the three phase induction generator equipped with FACTS based switched filter compensation scheme (SFC) used to ensure Dynamic Voltage Regulation (DVR), and efficient energy utilization of micro grid wind schemes for residential/commercial applications. Key words: Flexible alternating current transmission system - switched filter compensation, efficient utilization, micro-wind generation. INTRODUCTION The growing demand for alternative/renewable energy utilization is motivated by global demand and rising environmental concerns. The expected excessive World demand for energy and rising cost of fossil fuel due to depleted resources worldwide is pushing the drive to harness viable solar and wind energy in large scale, as well as micro grid green energy applications and large scale energy-farming. Green energy resources such as photovoltaic, wind and geothermal are now real economic choices due to competitive cost of energy and emerging technologies in advanced materials, processing and large scale energy farming, now resulting in competitive energy cost per kW hour; which is now estimated to range between

A Flexible PV-Powered Battery-Charging Scheme for Electric Vehicles

0.05 and 0.06 for wind, and 0.25 and 0.35 for new efficient thin film PV solar cells.

An Efficient Switched Filter Compensation Used LED Lighting PV-Battery Scheme

ABSTRACT This paper presents a new design for a low-impact, fully controlled, and flexible self-adjusting DC side pulse-width modulation (PWM)-hybrid modulated filter compensation (HMFC) scheme for multi photovoltaic-arrays utilized for vehicle-to-grid battery-charging electric vehicle schemes. The flexible HMFC scheme developed by the first author as a member of dynamic hybrid capacitor compensation and filtering scheme is robust and effective as it ensures maximum energy utilization and low inrush current transients. In addition, it provides transient voltage damping for a stabilized common DC interface bus to the battery charger. The new flexible controller uses a regulated multi-loop error-driven, error-scaled, and de-coupled hybrid mode charging controller for the PWM switching scheme along with two MOSFET/IGBT (Metal Oxide Semiconductor Field Effect Transistor/Insulated Gate Bipolar Transistor) complementary switches based on ratings and are cascaded for proper voltage and current photovoltaic (PV) arrays utilized. The dynamic error-driven controller ensures reduction in inrush current and transient voltage conditions as well as compensation for cloudy and shadowy conditions by equalizing the maximum power utilization of the two PV arrays. This will ensure efficient PV solar-system energy utilization as well as fully de-coupled source-load operation for the new proposed multi modal Li-ion battery-charging controller. The multi-regulator error-driven proportional integrated derivative controllers with newly added acceleration and fast response auxiliary loops ensure efficient fast charging as well as common DC-bus stabilization under load excursions, temporary faults, and battery hybrid voltage-current-power (V-I-P) charging modes. The hybrid switched/modulated capacitive-filter compensator ensures limited current excursions for transient DC voltage conditions.

Comparison of Different Controllers and Stability Analysis for Photovoltaic Powered Buck-Boost DC-DC Converter

This study presents a completely stabilized and novel flexible self-adjusting light emitting diode (LED) lighting scheme powered by a PV-Battery and using a pulse width modulation (PWM) switching multi-regulation dual-loop error-driven weighted modified proportional–integral–derivative (WM-PID) accelerated control scheme. The presented scheme incorporates a green plug filter capacitive switched compensator scheme to ensure efficient energy utilization and reduced inrush currents and switching transients. The LED lighting load is regulated using two stabilizing switched filter compensation (SFC) devices located at the DC side common and load buses. It ensures damping of transient voltage and reduces inrush currents for enhanced energy efficient operation and minimal stresses on the solid-state switches. The proposed multi-regulator controller uses a dual-loop error-driven, error-time de-scaled controller for the PWM switching scheme. The dual-action regulator uses total error-driven signal fed to the fast-...

Implementation of an electrolysis system with DC/DC synchronous buck converter

Abstract In this study, proportional integral (PI), fuzzy logic (FL), and sliding mode (SM) control of DC-DC buck-boost converter are presented. The obtained results were compared for these controller methods. The converter system, which is powered by photovoltaic (PV) modules, was simulated using the MATLAB/Simulink software. The sliding mode controller in which the inductance current and the output voltage are used as controller variables was tested and the results are compared with the results obtained by the fuzzy logic controller and proportional integral controller. The small signal analysis of the DC-DC buck boost converter has been conducted for the stability analysis of the designed system. Bode phase and magnitude diagrams are plotted for different duty ratios. The performance of the converter has been analyzed in detail for different photovoltaic conditions. The converter has been simulated for controllers and PV module using different parameters and the effects have been observed by the results. The converter experimental setup was implemented and the results were repeated. A digital signal processor (DSP) was used for the experimental study for faster processing. The experimental results were found to be compatible with the simulation results.