Journal Publications

(For full and recent list of publications please visit the Google Scholar profiles of principal investigators: Emine Bostancı, Murat Göl, Ozan Keysan,

2019

A Rare-Earth Free Magnetically Geared Generator for Direct-Drive Wind Turbines

A novel Vernier type magnetically geared direct-drive generator for large wind turbines is introduced in this paper. Conventional Vernier-type machines and most of the direct-drive wind turbine generators use excessive amount of permanent magnet, which increases the overall cost and makes the manufacturing process challenging.

R. Zeinali, O. Keysan

A Malfunction Detection Method For PV Systems

Considering that number of operational PV systems is very high, and occurrence of a malfunction is rare, use of automatic malfunction detection methods necessitates. This paper develops a method that detects any malfunction of a PV system. The malfunction may refer to failure of communication network, sensor malfunctions or data logging unit errors as well as problems of inverters and PV panels.

T Yildiz, M Gol

Multi-physics design optimisation of a GaN-based integrated modular motor drive system

Here, a multi-physics approach is presented for the design optimisation of an integrated modular motor drive (IMMD). The system is composed of a modular permanent magnet synchronous motor (PMSM) and a GaN-based modular motor drive power stage.

M. Ugur, O. Keysan

A Comparative Study on Feature Selection Based Improvement of Medium-Term Demand Forecast Accuracy

Considering that number of operational PV systems is very high, and occurrence of a malfunction is rare, use of automatic malfunction detection methods necessitates. This paper develops a method that detects any malfunction of a PV system. The malfunction may refer to failure of communication network, sensor malfunctions or data logging unit errors as well as problems of inverters and PV panels.

E Ilseven, M Gol

Simulations and Experiments of EMFY-1 Electromagnetic Launcher

ASELSAN Inc. has been conducting experimental research on electromagnetic launch technologies since 2014. The first prototype, EMFY-1, has 25 mm × 25 mm square bore and 3-m-length rails. In addition, two capacitor-based pulsed-power supplies (PPSs) with 1- and 4-MJ stored energy are built to supply launcher.

D Ceylan, M Karagöz, Y Çevik, B Yildirim, H Polat, O Keysan

Design of Double Sided Linear Motor with Easy to Manufacture Hairpin Plate Winding

This paper presents a double sided permanent magnet linear synchronous motor (DSPMLSM) with novel V-shaped hairpin plate windings and diagonally placed square magnets.

G Çakal, O Keysan

Multi-objective design optimization of a permanent magnet axial flux eddy current brake

The main aim of this study is to optimize an axial flux eddy current damper to be used in a specific aviation application. Eddy current dampers are more advantageous compared to conventional mechanical dampers as they are maintenance-free due to contactless structure and have higher reliability, which is very desirable in aerospace applications..

RT ASL, HM YÜKSEL, O Keysan

METU Smart Campus Project (iEAST)

The main aim of this study is to optimize an axial flux eddy current damper to be used in a specific aviation application. Eddy current dampers are more advantageous compared to conventional mechanical dampers as they are maintenance-free due to contactless structure and have higher reliability, which is very desirable in aerospace applications..

Ş. Ertekin, O. Keysan, M. Göl, H. Bayazıt, T. Yıldız, A. Marr, M. Ganji, S. Teimourzadeh, O. Tör, S. Özkavaf

Performance comparison of passive series R and shunt RC damped LCL filter for grid-connected inverters

LCL filters are widely used in distributed power-generation systems to attenuate high-frequency harmonics caused by pulse-width modulation switching of grid-connected inverters. A resonance occurs due to the series-connected reactive components. In order to damp resonance effects, active and passive damping methods are used.

H Temiz, E Demirok, O Keysan, A Türkay, B Çetinkaya

 

2018

Armature Shape Optimization of an Electromagnetic Launcher Including Contact Resistance

In this paper, the shape of the armature of an EML with 10-MJ current pulse generator, 1000-kA peak current, and 4.5-ms excitation time is optimized by using independent variables to define the exact geometry of the armature.

D Ceylan, MU Güdelek, O Keysan

IEEE Transactions on Plasma Science

Inter-turn Short Circuit Faults in Permanent Magnet Synchronous Machines: An Extended Review and Comprehensive Analysis

This paper presents an extended review and recent advances in modeling and diagnosis inter-turn short circuit (ITSC) faults in PMSM supported with in-depth fault analysis.

M Zafarani, E Bostanci, Y Qi, T Goktas, B Akin

IEEE Journal of Emerging and Selected Topics in Power Electronics

Hydro-Optimization-Based Medium-Term Price Forecasting Considering Demand and Supply Uncertainty

This paper proposes an electricity market model of Turkish electricity market for monthly and yearly electricity price forecasting in medium-term by means of supply and demand dynamics formed via a theoretical approach.

E İlseven, M Göl

IEEE Transactions on Power Systems, 2018

A new model predictive torque control strategy with reduced set of prediction vectors

Major drawback of finite control set model predictive control (FCS-MPC) is its high computational burden. This paper proposes a new optimal vector selection strategy that reduces the computational cost of FCS-MPC technique.

İ Şahin, O Keysan

2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering

A Decentralization Method for Hybrid State Estimators

Hybrid state estimation determines the states of systems monitored both by conventional SCADA measurements and PMUs. This paper proposes a decentralization method in order to improve the computational performance of hybrid state estimators with minimum loss of accuracy

M Göl

A Comprehensive Analysis of Short Circuit Current Behavior in PMSM Inter Turn Short Circuit Faults

This paper presents a detailed analysis of short circuit current behavior during inter turn short circuit faults in permanent magnet synchronous machines (PMSMs) by considering the short circuit contact resistance.

Y Qi, E Bostanci, V Gurusamy, B Akin

Determination of harmonic current contributions based on robust state estimation

In this paper, a state estimation based method is proposed to determine harmonic current contributions of plants supplied from a point of common coupling (PCC).

E Sezgin Ö Salor M Göl

 

2017

Effect of Conducting Containment on Electromagnetic Launcher Efficiency

In this study, the effect of distance between non-laminated conducting containment and rails, and the effect of the lamination thickness on the efficiency of railgun are investigated.

D. Ceylan, O. Keysan

18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering 2017

Voltage variation model for DC catenary line of a subway system

In this paper a DC catenary voltage model is proposed for a multi substation subway system. The proposed method is capable of simulating dynamic behavior of the train during different modes of operation.

E. Sezgin, M. Göl

DC link capacitor optimization for integrated modular motor drives

In this paper, selection of optimum DC link capacitor for Integrated Modular Motor Drives (IMMD) is presented

M. Uğur, O. Keysan

2017 IEEE 26th International Symposium on Industrial Electronics (ISIE)

Medium-term electricity demand forecasting based on MARS

The paper proposes use of multivariate adaptive regression splines (MARS) method to perform monthly electricity demand forecasting for medium-term. The model is developed based on specific example of Turkey; however is applicable to any other system.

E. İlseven, M. Göl

Innovative Smart Grid Technologies Conference Europe (ISGT-Europe), 2017 IEEE PES

Armature shape optimization of an electromagnetic launcher using genetic algorithm

In this study, the shape of the armature is optimized by using independent variables to define the exact geometry of the armature. The main goal is to maximize the muzzle kinetic energy of the projectile.

D Ceylan, M.U. Güdelek, O. Keysan

2017 IEEE 21st International Conference on Pulsed Power (PPC)

Robust local parameter estimator based on least absolute value estimator

This work proposes a local parameter estimator based on the least absolute value (LAV) estimator, which is known to be robust against bad measurements, ie measurements with gross error.

V. Özdemir, M. Göl

Comparison of winding configurations in double-stator switched reluctance machines

The double-stator configuration of the switched reluctance machine (SRM) aims to maximise the energy conversion efficiency by optimising the ratio of motional force to the total magnetic force. Maintaining the attractive features of SRM, the double-stator switched reluctance machine (DSSRM) proves to have higher torque/power density than the conventional SRM, which is a crucial feature for traction applications.

Y Qi, E Bostanci, V Gurusamy, B Akin

Identification of bad solar power generation data

In this paper, a novel method has been presented for the bad data identification of the data recovery process from a solar power measurement data set. Due to failures in solar power measurement logging devices.

E. Duymaz, D. Şengül, M. Göl

On the proximity effects of high-energy magnets on M-19 magnetic steel core

This paper focusses on the effects of these high-energy magnets on the magnetic properties of M-19 steel core. It is observed that the relative permeability of the M-19 steel decreases when it is kept in contact with three sintered Neodymium (NdFeB), grade N45 permanent magnets …

Robust local parameter estimator based on least absolute value estimator

This work proposes a local parameter estimator based on the least absolute value (LAV) estimator, which is known to be robust against bad measurements, ie measurements with gross error.

V. Özdemir, M. Göl

Optimal design of synchronous reluctance machines

This paper proposes a new design approach applied to optimal design of synchronous reluctance machines. The proposed technique removes all the conventional constraints posed by traditional designs of classic magnetic configurations and only keeps a minimum airgap length and shaft diameter as the boundary conditions.

M Kiani, E Bostanci, B Fahimi