Ayse Elif Sanli

Investigation of the Vehicle Application of Fuel Cell-Battery Hybrid Systems

All electric vehicles (AEV) are developed using the new technology; they can be separated in two groups as battery-operated electric vehicles (EV) and fuel cell vehicles (FCV). The subject of this study, fuel cell-battery operated hybrid vehicles, is about full electric hybrid vehicles (FEHV). EV and FCV have different advantages and disadvantages, therefore it is necessary to develop the FEHV vehicles. The fuel cell-battery hybrid systems are under investigation. In the literature, some automotive applications are reported as examples for fuel cell-battery hybrid powered systems. The light hybrid vehicles have been tested in terms of the system design, power management, road tests, and efficiency. All of the presented systems consist of a proton exchange membrane fuel cell system, battery pack, powertrain system, and a connection strategy for powering the traction of an electrical car. However, these are not perfect vehicles, they require further work to address major drawbacks with the connection as well, to increase the efficiency and management of the hybrid components (fuel cell, battery, supercapacitors, motor drive, and electrical systems), motor drive and electrical systems. Their tests and the demonstration results are satisfactory.

Comparison of power and energy density after full shunting-balancing in serial connected lithium-ion batteries and serial-connected supercapacitors

In this study, advantages and disadvantages of supercapacitors and batteries which are energy storing sources were examined and furthermore, energy density, voltage and current behaviors of 6 serial connected supercapacitors and 6 serial connected battery sequences were compared. While establishing these circuits, full shunting balancing methods were used. When 4 units of 6 serial connected batteries/supercapacitors reached to the 100% charged level, system passed to discharging mode from charging mode and total charge ratios of the systems were calculated.

The multi-windings forward structure battery balancing

A structure for active battery balancing with using Multi-Windings Transformer is presented. Most of applications in electrical vehicles need smart voltage control and high effective battery systems. In generally, the battery stack systems consist of these three parts: management, safety and balancing. In these parts, balancing is the most significant part since the management demands to improve the cycle life, battery storage packs, and power capacity. This paper presents the real-time Multi-Windings Transformer balancing topology forward structure model, simulation, and real circuit implementation with using Texas Instruments Stellaris® Launchpad Evaluation Kit (EK-LM4F120XL) with Energia based coding. Also, this paper indicates the emphasis of using forward structure model of Multi-Windings Transformer balancing topology since we use forward structure converter for dimishing the extra energy loses and decrease cost of the system.

Fuel cell powered hybrid system controlled by the maximum peak power tracking technique

In the present study a borohydride/peroxide fuel cell/Li-ion battery hybrid system was developed. Output power of DBPFC was controlled and kept constant by MPPT algorithm. The voltage ripples of the fuel cell were prevented. Moreover, Li-ion battery was charged with a stable power of direct borohydride/peroxide fuel cell.