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This paper proposes an adaptive power management strategy with reduced sensor requirement for grid connected hybrid microgrid system under faulty conditions which occur in grid tied converters. Generally parallel combination of grid tied converters (GTCs) are used as an interface between microgrid and grid, which are responsible for power transfer among renewable energy sources (RES), hybrid energy...
This paper proposes a power sharing scheme for an Islanded DC microgrid with hybrid energy storage system (HESS). HESS comprises of battery and supercapacitor (SC), where the usage of supercapacitor reduces the current stresses on the battery. This scheme reduces the losses in the HESS interfacing converters along with State of Charge (SOC) balancing. To maintain a constant DC link voltage a DC link...
Battery temperature is a key performance metric that drives greater importance due to recent development in fast charging methodologies. This paper presents a discrete time thermo-electric battery model which estimates instantaneous battery temperature. Proposed model is then subjected to a temperature sensitive control system which determines the pulse width of the pulse charging operation. Simulation...
Li Ion batteries are the proficient energy source for powering Hybrid Electric Vehicles (HEV) due to its smaller size, lighter weight, and improved charge efficiency without memory effect. The battery pack constitutes of a combination of cells in series and parallel configurations. Due to cell impedance mismatch, each cell possesses different potentials which cause different State of Charge (SOC)...
Passing cloud results in rapid changes of irradiance. The intermittency of PV power output has drawn serious concern when the system is connected to electricity networks. The energy storage system (ESS) is considered as the most promising solution to balance and smooth the PV generation. Consequently, power ramp-rate control (PRRC) has been introduced to avoid significant PV power fluctuations. However,...
Battery energy storage systems play a vital role in renewable energy based electric power grids. Inverters are essential to integrate DC energy storage devices such as batteries to AC power grids. In this paper, a cascaded boost inverter topology based single-phase grid-connected battery energy storage system is presented. A current feedback ripple reduction method is used to mitigate the second-order...
This paper presents an online capacity estimation method for lithium ion battery cells. The method takes advantage of the significant points defined by state of charge (SOC) and transferred charge. And the unscented Kalman filter based (UKF-based) SOC estimation method is applied for the selection of the significant points. Based on multi significant points, the accurate and robust online capacity...
The accurate modeling of electrochemical batteries has to be considered a significant issue in the design of control algorithms applied to energy storage systems. In this paper, a comprehensive analysis of Energy Storage System models based on equivalent electric circuits is presented. Such models are compared by means of a multi-criteria approach considering performance, applications, battery technologies...
Estimation State-of-Charge (SOC) of Lithium-ion batteries is a main function of battery management system (BMS), which play critical roles in the application of batteries. The applications in electrical vehicles and consumer electronics require a time efficient algorithm to produce accurate SOC estimation. Extended Kalman filter (EKF) is widely used in state estimation because it provides a simple...
The upgrade of power systems in the last years due to the proliferation of distributed generation with renewable energy sources, active users and electric vehicles has become a challenge. In this new scenario, prosumers play an important role in order to buffer the consumption curve and, therefore, contributing to the grid requirements. Special attention is attracted by photovoltaic (PV) arrays integrated...
Stationary Energy Storage System (SESS) using Lithium ion (Li-ion) batteries have been in operation in Japan and abroad for the purpose of introducing against regeneration canceled and compensation for a voltage drop, energy saving. This report is made on the effect of energy saving of the SESS based on a case of the introduction of the SESS in Horinouchi Substation of Keio Corporation out of the...
Battery energy storage system (BESS) can achieve good effect of energy saving and voltage stabilization in urban rail transit system. In order to make better use of the capacity of the battery, this paper put forward an improved control strategy based on state of charge (SOC) tracking to achieve peak load shifting. The mathematical model of the traction power supply network which combined trains and...
This paper introduces a distributed energy management for islanded DC microgrids with electric vehicles (EVs) penetration. The energy management problem is divided into two stages. The first, named as filtering stage, is controlled through wavelet filter using the ultracapacitor. The second one is modeled as a noncooperative stackelberg game, where the battery energy storage system is designed as...
An effective optimization of proportional integral observer for SOC estimation of lithium ion batteries is done in order to get a very high accuracy. During experimentation, a negligible error band of just 0.6% was found which is the quite high efficiency yet reported in the research area of state of charge estimation of Li-ion batteries. The worth mentioning improvements covered in this paper are...
This paper proposes an interleaved partial power converter (PPC) for the DC-DC conversion stage of electric vehicles (EVs) fast charging stations. The proposed converter topology is based on the H-bridge DC-DC converter. PPC allows the converter to process only a fraction of the total power, the rest being bypassed and directly supplied to the load. This increases the converter efficiency, as only...
We have previously proposed a novel parameter identification method for the Li-ion battery equivalent circuit model (ECM) considering the electrochemical properties, with which a second order ECM resistances/capacitances values can be obtained from electrochemical parameters. In this paper, we apply this physics-based ECM with Kalman filter for cell SOC estimation. To implement the Kalman filter to...
With the widespread use of smart appliances in the residential area, the load side of the microgrid is becoming more and more flexible. As we all know, the renewable energy generation is usually uncontrollable, so how to dispatch the controllable generation devices, storage system and flexible loads to guarantee the safe and economical operation of the microgrid is a very important problem to be solved...
Energy flow control (EFC) of residential microgrids (RMGs) equipped with renewable generations (RGs) is an essential component for the future smart grid that contributes to enhance renewable energy consumption and reduce cost. Different from most existing papers that devote to offline EFC to against the uncertainties caused by RGs and local load demand in RMGs, this paper focuses on online EFC framework...
There has been a desirable trend in recent years towards Electric Vehicles (EVs) contributing less air pollution and noise pollution than internal combustion engine vehicle. EV charging/discharging problem brings a new challenge to the power operation and control. In this paper, the charging/discharging problem is modelled by noncooperative game theory, the payoff function of this model not only maximizes...
In this paper a model suitable for representing the electrical dynamic behaviour of Sodium Metal Halides Batteries (SMHBs) has been reported. In particular, the Thévenin circuit approach has been investigated considering the equivalent circuit parameters depending on the State Of Charge (SOC). The proposed SMHB model has been developed referring to the experimental tests conducted on a commercial...
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