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The state of energy (SOE) of Li-ion batteries is a key indicator for the energy optimization and management of energy storage devices (ESDs) in electric vehicles (EVs) and smart grids. To improve the SOE estimation accuracy, a hybrid Li-ion battery model is presented in this study against the dynamic loads and the rate energy effects of the battery. Firstly, in order to take the advantages of both...
The reliability of power converters has become a major design concern especially for those mission-critical industrial and aerospace applications required to operate in a harsh environment. There is a need for real-time monitoring techniques that are capable of tracking health status to give an alert signal before a disastrous system failure and furthermore make the early failure prediction due to...
The state of energy (SOE) of Li-ion batteries is a key indicator for the energy management and optimization of energy storage systems (ESSs) in smart grids and electric vehicles (EVs). In order to improve the SOE estimation accuracy, an electrical Li-ion battery model is presented in this study against the dynamic loads and the rate energy effects of the battery. Firstly, in order to take into thorough...
The applications of Li-ion batteries used in energy storage system (ESS) in building environment is drawing more and more public attention and it is predicted to hold the most share of battery market in the year of 2020. In this paper, an equivalent circuit battery model for the ESSs applications in building environment is proposed, and the parameters are extracted experimentally. A new methodology...
This paper presents the benefits of interleaving three phase voltage source converters (VSCs) to improve the power density. The output harmonics are also analyzed in frequency domain, then design and optimization of coupled inductor and output filter are given. Verifications are carried out through electrical circiut and electromagnetic's FEM simualtions. Finally, the inductor weight are compared...
Phasor Measurement Units have been applied on power system to improve the performance of power system state estimator for decades. As it is not practical to install one PMU at every bus in a power system due to its high cost, plenty of research focus on solving the optimal PMU placement (OPP) problem which is to determine a placement with minimum number of PMUs while ensuring network's observability...
Phasor Measurement Unit (PMU) has been applied on power system to improve the performance of power system state estimator for decades. It is anticipated that PMUs will observe distribution networks in future considering the contribution of PMUs to transmission networks. The advent of micro phasor measurement unit (μPMU) makes it possible to employ phasor measurement devices in distribution networks...
The state of energy (SOE) of Li-ion batteries is a key indicator for the energy optimization and management of energy storage devices (ESDs) in electric vehicles and smart grids. In order to realize the improvement of the estimation accuracy and reliability of battery SOE, factors that influence the discharging performance of Li-ion batteries are investigated thoroughly in this study. The discharging...
This paper presents a dynamic model predictive voltage control (DMPVC) method for the single-input dualoutput (SIDO) flyback converter. In this converter, cross regulation is one of the most critical issues because its primary winding is shared by its secondary windings so that the two output voltages are interacted with each other. The proposed method has the ability to reduce cross regulation significantly,...
The differential current in Modular Multilevel Converters (MMCs) is inherently subjected to even order harmonics, which are mainly caused by the voltage mismatch between phase legs and dc bus. This issue may exist in both single-phase and multi-phase MMC systems and can be eased by repetitive control based active harmonic suppression methods, which regulate the circulating current through legitimate...
Repetitive control strategies have been commonly applied in pulse-width modulated (PWM) inverters for many industrial applications. The phase delay in the overall control system, e.g. the delay caused by the digital duty cycle calculation, PWM generation and the repetitive controller, has to be compensated by elaborately designed phase lead filters in order to prevent control performance deterioration...
For a Li-ion battery based energy storage system, the state of energy is a key index for the energy management and operation optimization. In the actual Li-ion batteries based energy storage system in building environment, the varying load current will lead to the estimated battery's residual energy deviated from the real value. To solve this problem, an equivalent circuit model is presented for the...
Phasor Measurement Unit (PMU) has contributed greatly to power system state estimation because of its ability to directly measure voltage and current phase angle. PMUs have been used almost exclusively in transmission systems monitoring. Recent years, increasing penetration of renewable energy sources brings new characteristics into distribution system such as bi-directional power flows and voltage...
This paper investigates the energy efficiency of Li-ion battery used as energy storage devices in a micro-grid. The overall energy efficiency of Li-ion battery depends on the energy efficiency under charging, discharging, and charging-discharging conditions. These three types of energy efficiency of single battery cell have been calculated under different current rates. The relations of the energy...
In recent years, there is growing interest in improving lithium-ion battery state monitoring. This is due to growing concern over ensuring reliable and safe operation of lithium-ion based energy storage system especially in automotive and stationary e.g. UPS in data center applications. In this paper, battery state of charge estimation based on Extended Kalman Filter (EKF) and improved battery model...
This paper analyses the parameter dependence during the charging process of a Vanadium Redox Flow Battery (VRB) for a system-aware green data center which has distributed sources of energy production and amenable to flexible load scheduling. One of the key features of a flow battery is the ability to control the flow rate and current during the charging process. The flexibility however has a direct...
Typical low cost light sensors used in modern day buildings have an error of up to 40%. To achieve intelligent lighting control for intelligent energy management, illuminance sensor nodes need to have less than 5% error. In order to realize such sensors, high accuracy illuminance sensors of error less than 3 % are proposed to be integrated with high resolution Analog to Digital Converters (ADC). Subsequently,...
A modularized battery system with Double Star Chopper Cell (DSCC) based modular multilevel converter is proposed for a battery operated electric vehicle (EV). A design concept for the modularized battery micro-packs for DSCC is described. Multidimensional pulse width modulation (MD-PWM) with integrated inter-module SoC balancing and fault tolerant control is proposed and explained. The DSCC can be...
This paper presents a design and optimization method to harness wind energy using PMSG, diode rectifier, boost DC/DC converter and grid-connected VSI DC/AC inverter with LCL filter. A systematic procedure has been adopted to design the system to extract maximum power for a given wind speed. The design methodology has been verified by Simulink based platform. The system operates up to its design target,...
The need for grid scale energy storage is inevitable in the future. Among all the available battery technologies, Redox Flow Battery (RFB) is one of the most feasible options for large-scale energy storage. Different species of vanadium ions in the battery diffuses at different rates across the membrane and this limits the capacity of the battery over long period of operation. In this paper, the concentration...
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