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The structure and working principle of hybrid energy storage system are introduced. The classical RC model of ultracapacitor is analyzed, and the topology of charging and discharging converter of energy storage system is studied. A ultracapacitor-battery hybrid energy storage system model based on bidirectional boost-buck circuit is constructed, and the charging and discharging process of the energy...
This paper presents the analysis, design and simulation results of a dc-dc LLC resonant converter fed by photovoltaic (PV) panels. In order to achieve MPPT (Maximum Power Point Tracking), a Variable Inductor is used to control the converter operation. In order to analyze the converter operation a simple dc load (resistor with fixed value) is considered and simulations results are presented considering...
This paper presents a load sharing method applied in a distributed micro grid system. The goal of this method is to balance the state-of-charge (SoC) of each parallel connected battery and make it possible to detect the average SoC of the system by measuring bus voltage for all connected modules. In this method the reference voltage for each battery converter is adjusted by adding a proportional SoC...
Solar power generation is considered one of the most promising distributed generation (DG) technologies that is utilized in microgrids. Power intermittency and voltage swings of solar resource negatively affect the reliability of microgrids. Battery energy storage systems (BESS) are incorporated in such microgrids to mitigate the power intermittency of photo-voltaic (PV) system. However, this power...
One of the solutions to tackle the problems of high peak demand and grid instability due to high photovoltaic (PV) power penetration is to deploy a battery storage system. This paper presents a real-time battery management algorithm (BMA) for peak demand shaving in small energy communities with grid-connected PV systems. The BMA aims to control the charge/discharge of the community battery storage...
This work implements an asymmetric loading rectification technique in an Inductive Power Transfer System (IPTS) intended for use in electric vehicle wireless chargers. Asymmetric loading is performed by a half-cycle short-circuit / half-cycle loading operation, in the secondary side of a series-series compensated IPTS. The aim is to reduce the value of the load resistance as reflected to the power...
In inductive battery charging systems for electric vehicles the power flow to the battery has to be controlled according to the battery state of charge (SOC), the magnetic coupling between primary and secondary side and other operation parameters. It is well known that the output power can be controlled by fixed frequency or variable frequency techniques applied to the high-frequency inverter (HFI)...
Based on the I–V equation of photovoltaic (PV) cell and the output characteristics of maximum power point tracking (MPPT), this paper proposes a novel identification method to identify four key parameters of PV array: photo current Iph, negative saturation current I0 , diode ideality factor n and the series resistance of cells Rs, by using the measured input and output data of PV array. According...
Battery and ultracapacitor hybrid energy storage systems have long been proposed as alternatives to battery-only systems for electrified vehicles. Prior research has focused on system topologies, dc/dc converter design, control methods, and evaluating specific applications. This work utilizes a rule-based control method and dynamic programming combined with a vehicle model to evaluate the reduction...
Cell phones and other portable electronic video and music players are irresistible devices in our lives. Bigger screens and complex processes of these devices require high power demand which can cause battery charge problem in over use. Nowadays, smart phones and other portable electronic devices are more widely adjustable to charge via usb port. In this paper, portable device charge system is proposed...
The thermoelectric generation (TEG) system has its special charactristics of high stablility, low voltage and high current output, which is different from PV modules. The power conditioning system and control schemes used in PV applications cannot be directly applied to TEG applications. A power conditioning system for TEG based on interleaved Boost converter with maximum power point tracking (MPPT)...
In recent years, there has been active research on exhaust gas waste heat energy recovery for automobiles. In this paper, the thermoelectric energy system with parallel configuration is proposed and implemented for automobiles. Compared with the series-connected thermoelectric energy system, the parallel-connected thermoelectric energy system offers higher overall efficiency with bidirectional converter...
Ability of fuel cell systems to produce power is limited. So it is necessary to force the system to operate in conditions which correspond to fuel cell maximum power point (MPP). Since fuel cell MPP is a unique and fixed point of operation, load power requirements are not taken into account and output voltage will vary with variations of load resistance. In this paper, a new configuration for fuel...
Electric double-layer capacitor (EDLC) is a perfect complement of battery in technical character. The EDLC/battery hybrid has the virtues of high energy density, high power density and long cycle life. The model of the hybrid was established and the performance was analyzed in this paper. In pulsed load applications, the amount of battery and system cost can be reduced largely due to the high power...
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