Hasan Tiryaki

Istanbul University - Cerrahpasa · Electrical and Electronics Engineering

A concentrated photovoltaic–thermoelectric (CPV–TE) hybrid system, if operated properly, can generate higher output power than a stand-alone concentrated photovoltaic system, due to the contribution of a thermoelectric generator in the system. Herein, to understand the effect of the transport properties of thermoelectric (TE) materials on the hybri...

Post modifications such as alloying element addition and/or heat treatment are applied to improve the magnetic properties of NdFeB permanent magnets. In this study, effects of external magnetic field and flash annealing at different temperatures (680 °C and 710 °C) and durations of 5 and 10 min on the magnetic properties of relatively high Nd conte...

A thermoelectric module was modeled and analyzed in COMSOL Multiphysics using a finite element method (FEM). An optimum coefficient of performance of 0.4 is achieved at an operational current of 2 A, and a maximum heat load of 0.52 W is obtained at zero temperature gradient. The system’s dynamic cooling behavior was simulated and the input and outp...

The settings of conventional controllers, which are commonly used in power plants, are determined based on system characteristics during the establishment phase, and, thus are unable to adjust to changing system dynamics over the life of the plant. To avoid this unsatisfactory state, the parameters of the controllers used in electric power plants s...

This paper proposes a novel Stability-Based Artificial Intelligence Method for predicting the optimum parameters of the proportional-integral-derivative controller in an automatic voltage regulator system. To implement the stability-based artificial intelligence method, first, parameters which are of great importance for the control of the system a...

In this article, proportional‐integral (PI) control to ensure stable operation of a steam turbine in a natural gas combined cycle power plant is investigated, since active power control is very important due to the constantly changing power flow differences between supply and demand in power systems. For this purpose, an approach combining stabilit...

Transportation systems take an essential place in traffic planning. While designing railways, transportation between access points is planned to be realized within the desired time. The average speed between access points is affected by parameters like waiting time, motion resistance, slope, curve, traction force, maximum speed, the mass of the veh...

Thermoelectric generators harvest additional electrical power when used in combination with concentrated photovoltaic cells given rise to a hybrid system. Overall cost of the system is high; therefore, the parameters of the system need to be optimized to obtain high output performance. This study determines the output performances of four sets of e...

In this work, we explored the effect of heat treatment on high boron and Nd-lean content magnetic Nd7Fe73B20 nanocomposite materials via vibration sample magnetometer (VSM), X-ray diffraction, differential thermal analysis (DTA), and scanning electron microscope (SEM). The Scherer formula was employed to estimate the effect in the crystal size of t...

In this study, the design of the electronic card of the hybrid control unit, which is one of the most important control units for a hybrid vehicle, and how the control of the hybrid control unit should be created with the fuzzy logic controller is mentioned. In the study, it was underlined that the control card is created with different input and o...

Today, the use of hybrid and electric vehicles is increasing day by day in the world and in our country in line with environmental issues, economy, etc. Electric cars that move with the power of the electric motor and hybrid type cars, which are powered by both electric and hydrocarbon fuels, are designed and offered for widespread use. In this stu...

In this study, the determination of the maximum value of the voltage drop created by the traction force was performed for a 1500 V DC-fed rail system by means of the artificial neural networks (ANN) and support vector machines (SVM). The voltage drop occurring on the line was calculated with regard to the operating parameters by means of the ANN an...

Railway electrification systems are designed with regard to the operating data and design parameters. The minimum voltage rating required by traction during the operation should be provided. The maximum voltage drop on a line determines the minimum traction voltage. This voltage should be maintened within certain limits for the continuity of operat...

Bu çalışmada 1500 V DC beslemeli bir raylı sistem elektrifikasyon sistemine ait trafo merkezi yerleşiminin optimizasyonu yapılmıştır. Çalışma için projelendirme çalışmaları devam eden Sultangazi-Aranavutköy metro projesine ait veriler kullanılmıştır. Optimizasyon için trafo merkezi fider akımları, sefer sıklığı ve hat gerilimi kullanılarak en iyi t...

This paper describes the prediction of the accidents and incidents by modelling the faults that are hard to be predicted, and forms the stochastic processes in railways. As it is seen, the root causes of the occurrence of the accidents and incidents in railways are the technical faults, the organizational faults, the staff faults, the third-party f...

In this study, the simulation of an electrification system and traction power system of a 25 kV AC feed railway line was performed with all its subcomponents using MATLAB/Simulink. The power flow theory was used while modeling the railway electrification system. The transformer substation, catenary, rail, and vehicle were modeled together with the...

Bu çalışmada 1500 V DC beslemeli bir raylı sistem elektrifikasyon sisteminin simülasyonu matlab/simulink yardımıyla yapılmıştır. Hat geriliminin ve ray geriliminin değişimi 3 farklı enerji besleme durumu için analiz edilmiştir. Besleme durumları tüm cer trafo merkezlerinin aktif olması, bir trafo merkezinin kaybedilmesi ve komşu iki trafo merkezini...

Nowadays, instead of conventional control techniques, modern control techniques have been implemented for a lot of industrial models practically or theoretically. In this study, a fuzzy logic-based control technique to regulate the power and enthalpy outputs in a model (300MW) contain first and second units of Ankara-Çayõrhan Thermic Power Plant wa...

This study presents a fuzzy logic based control technique to regulate the power and enthalpy outputs in a boiler of a 765 MW coal fired thermal power plant. An approximate mathematical model of the thermal power plant was developed by using real time data on Computer Aided Design and Control (CADACS) software. Conventional proportional, integral an...

Nowadays, instead of conventional control techniques, modern control techniques have been implemented for a lot of industrial models practically or theoretically. In this study, a fuzzy logic-based control technique to regulate the power and enthalpy outputs in a boiler of a 765 MW coal-fired thermal power plant was carried out. For comparison, a c...