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- 2018
- Battery energy storage systems
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[IEEE 2019 IEEE 14th International Scientific and Technical Conference on Computer Sciences and Information Technologies (CSIT) - Lviv, Ukraine (2019.9.17-2019.9.20)] 2019 IEEE 14th International Conference on Computer Sciences and Information Technologies (CSIT) - Method of optimizing the parameters of the photovoltaic solar power plant regime
摘要： A mathematical model of the energy-active elements of an industrial solar power plant by the photoelectric converters has been provided. A method for determining the parameters of the optimal spatial configuration of the solar power plant has been developed. The energy potential of the direct and scattered solar radiation, which has been defined using statistical data for specific geographic coordinates, energy and structural parameters of solar power plant elements refer to the input data. The optimization of spatial parameters has been carried out using a gradient method. The obtained results will allow to specify the parameters of solar power regimes and algorithms for controlling energy dynamical regimes.
关键词： input data,photoelectric battery,solar power plants,gradient method
更新于2025-09-23 15:19:57
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Mo-doped Zn, Co Zeolitic-Imidazolate Framework-derived Co9S8 Quantum Dots and MoS2 Embedded in Three-Dimensional Nitrogen Doped Carbon Nano???ake Arrays as an Efficient Trifunctional Electrocatalysts for ORR, OER and HER
摘要： Herein, we first propose a facile strategy to synthesize Co9S8 and MoS2 nanocrystals embedded in porous carbon nanoflake arrays supported on carbon nanofibers (Co9S8-MoS2/N-CNAs@CNFs) by the pyrolysis of Mo-doped Zn, Co zeolitic-imidazolate framework grown on carbon nanofibers and subsequent sulfuration. The electrocatalyst shows high and stable electrocatalytic performance, with half-wave potential of 0.82 V for ORR and overpotential at 10 mA cm-2 for OER (0.34 V) and HER (0.163 V), which outperform the metal-organic frameworks-derived transition metal sulfide catalysts reported so far. Furthermore, the Co9S8-MoS2@N-CNAs@CNFs are employed as an air cathode in a liquid-state and all-solid-state zinc-air battery, presenting high power density of 222 mW cm-2 and 96 mW cm-2, respectively. Such excellent catalytic activities are mainly owing to the unique three-dimensional structure and chemical compositions, optimal electronic conductivity, adequate surface area and the abundance of active sites. Thus, this work provides an important method for designing other metal-organic frameworks derived three-dimensional structural sulfide quantum dot multifunctional electrocatalyst for wider application in highly efficient catalysis and energy storage.
关键词： zeolitic-imidazolate framework,Co9S8 quantum dots,MoS2,nitrogen-doped carbon nanoflakes arrays,Zn-air battery,trifunctional electrocatalysts
更新于2025-09-23 15:19:57
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Decentralized Optimal Control of a Microgrid with Solar PV, BESS and Thermostatically Controlled Loads
摘要： Constructing microgrids with renewable energy systems could be one feasible solution to increase the penetration of renewable energy. With proper control of the battery energy storage system (BESS) and thermostatically controlled loads (TCLs) in such microgrids, the variable and intermittent energy can be smoothed and utilized without the interference of the main power grid. In this paper, a decentralized control strategy for a microgrid consisting of a distributed generator (DG), a battery energy storage system, a solar photovoltaic (PV) system and thermostatically controlled loads is proposed. The control objective is to maintain the desired temperature in local buildings at a minimum cost. Decentralized control algorithm involving variable structure controller and dynamic programming is used to determine suitable control inputs of the distributed generator and the battery energy storage system. The model predictive control approach is utilized for long-term operation with predicted data on solar power and outdoor temperature updated at each control step.
关键词： control of renewable power systems,thermostatically controlled loads,variable structure control,battery energy storage systems,decentralized control,model predictive control,solar PV,optimal control,control of microgrids
更新于2025-09-23 15:19:57
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Implementation of Dual-Circuit System for Additional Power Supply Based on Photovoltaic Converters for Electric Vehicles
摘要： The article presents a process of designing the photovoltaic (PHV) converters system for an electric vehicle, shows the scheme of photovoltaic converters usage, the results of electric vehicle motion modeling with photovoltaic converters, and the results of road tests of an electric vehicle with an additional power source based on photovoltaic converters. The photovoltaic converters system and low-voltage system of an electric vehicle have a shared low-voltage battery, which allows the implementation of two schemes of electric vehicle power supply. Initially, the aggregate base was selected, then, taking into account the e?ciency of each device included in the design of the new electric vehicle, mathematical modeling was carried out and showed good e?ciency results of the photovoltaic converters system. Then, the prototype was manufactured and tested. The aggregate base included the battery of photovoltaic converters assembled in a certain way on the vehicle roof, the MPPT (maximum power point tracking) controller, the bu?er storage device in the form of a 12 V battery, and the DC (direct current) converter that allows transmitting electricity from the bu?er battery to the high-voltage system. Modeling of the electric vehicle motion considered typical operating modes, including energy costs for the operation of assistant systems of the electric vehicle, as well as including the consumption of low-voltage components. The tests were carried out according to the NEDC (New European Driving Cycle). As a result, implementation of photovoltaic converters with 21% e?ciency allowed for the power reserve of the electric vehicle to be increased by up to 9%.
关键词： charging system,photovoltaic converter,electric vehicles,hybrid,photoelectric converters,solar battery,electric vehicle,charging infrastructure
更新于2025-09-23 15:19:57
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In situ forming of ternary metal fluoride thin films with excellent Li storage performance by pulsed laser deposition
摘要： In the field of lithium ion battery, conversion-based metal fluoride cathodes are attractive for their excellent theoretical capacity and high voltage. However, the utilization of binary metal fluorides is severely hindered by irreversibility and large voltage hysteresis. The introduction of ternary metal fluorides, like AgCuF3 and CuxFe1-xF2, brings hope to address these shortcomings. To better understand the basic mechanism of conversion reaction in ternary metal fluoride cathodes, the Cu–Fe–F (CFF) thin films were successfully grown in situ by pulsed laser deposition in this work. The physico-chemical properties and electrochemical performance were discussed. Such a CFF solid solution phase presented great cycle stability (82% capacity remains after 100 cycles at current density of 285 mA g?1) and higher energy efficiency (71.8%), which can be attributed to the reversible structural rearrangement after the delithiation process disclosed by ex situ XPS, high-resolution TEM, and selected-area electron diffraction.
关键词： Thin film,Ternary metal fluoride,Lithium ion battery,Pulsed laser deposition
更新于2025-09-23 15:19:57
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Teaching a Standalone Optics and Lasers Course Using Project-Based Learning
摘要： The identification of invalid data in recordings obtained using wearable sensors is of particular importance since data obtained from mobile patients is, in general, noisier than data obtained from nonmobile patients. In this paper, we present a signal quality index (SQI), which is intended to assess whether reliable heart rates (HRs) can be obtained from electrocardiogram (ECG) and photoplethysmogram (PPG) signals collected using wearable sensors. The algorithms were validated on manually labeled data. Sensitivities and specificities of 94% and 97% were achieved for the ECG and 91% and 95% for the PPG. Additionally, we propose two applications of the SQI. First, we demonstrate that, by using the SQI as a trigger for a power-saving strategy, it is possible to reduce the recording time by up to 94% for the ECG and 93% for the PPG with only minimal loss of valid vital-sign data. Second, we demonstrate how an SQI can be used to reduce the error in the estimation of respiratory rate (RR) from the PPG. The performance of the two applications was assessed on data collected from a clinical study on hospital patients who were able to walk unassisted.
关键词： Battery life,wearable sensors,respiratory rate (RR),electrocardiogram (ECG),signal quality,telemonitoring,photoplethysmogram (PPG)
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Degradation observation of 9 year old PV modules in Bangalore, India
摘要： We study battery filling policies with hard deadlines when the supply of energy can be modulated. This occurs for example with an electric plug-in vehicle using an adjustable electricity service for charging; such a service is offered in some countries as a means to provide flexibility to operators, and typically involves non-scheduled service reductions combined with a service guarantee that constrains these reductions. The problem for the battery user is to determine a charging policy, which we call a “consumption policy,” that meets a given “full battery” deadline while minimizing the energy cost (i.e., the bill paid to the electricity provider). As the charging efficiency is diminishing with respect to consumption, it is not optimal to charge as much and as early as possible. On the other hand service reductions cannot be predicted but it is possible to gain some information on the worst case reduction by analyzing past reductions. In this context, the computation of a causal consumption policy is an open problem. In this paper we consider a battery user interested in charging her battery while minimizing the worst case cost, where the total cost is a sum of two terms that reflect (i) the total energy consumption and (ii) the distance to a full battery at the deadline. We prove that there exists a causal consumption policy that minimizes the worst-case cost of the user. We find that the policy is threshold-based and give an efficient method to explicitly compute it at any time based solely on knowledge of past reductions, of the service guarantees and on the current distance to completion. Our method is based on the use of service curves and game theory.
关键词： Adjustable supply,repeated game,worst-case cost,service curves,battery management
更新于2025-09-23 15:19:57
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[IEEE 2019 Sixteenth International Conference on Wireless and Optical Communication Networks (WOCN) - Bhopal, India (2019.12.19-2019.12.21)] 2019 Sixteenth International Conference on Wireless and Optical Communication Networks (WOCN) - Condition Monitoring of Interconnecting Transformer Through ANN Approach
摘要： The integration of distributed energy generation systems has begun to impact the operation of distribution feeders within the balancing areas of numerous electrical utilities. Battery energy storage systems may be used to facilitate greater integration of renewable energy generation. This paper describes a method for determining the power and energy capacities a battery energy storage system would need in order to accommodate a particular photovoltaic penetration level within a distribution feeder, or conversely, the amount of photovoltaic that could be installed on a feeder with a minimal investment in power and energy battery energy storage system (BESS) capacities. This method determines the BESS capacities required to compensate both intra-hour and inter-hour load and photovoltaic ?uctuations to achieve a ?at feeder power pro?le. By managing the feeder power, the voltage drop along the length of feeder may be managed, thereby mitigating the voltage ?uctuation induced by the stochastic nature of both renewables generation and load. Doing so facilitates system bene?ts, such as conservation voltage reduction, fewer operations of load tap changers, and voltage regulators, and allows for deferment of capital expenditures.
关键词： shaping,photovoltaic (PV) integration,firming,Battery energy storage systems
更新于2025-09-23 15:19:57
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[IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Power Flow Control of a Standalone Photovoltaic-Fuel Cell-Battery Hybrid System
摘要： The major challenge facing photovoltaic (PV) sources penetration, especially for standalone applications, is their intermittent nature; hence hybrid systems arise where more than one energy source feed the same DC-bus. In this paper, a hybrid PV-fuel cell system is considered to serve a variable DC load under environmental changes. PV is considered the primary source of energy whereas the fuel cell (FC) is its backup. To enhance system reliability and cost effectiveness, batteries are added to supply energy during emergencies. A load sharing strategy is presented and tested for a variable load and irregular irradiation profile. Simulation results validated the proposed strategy, fulfilling a daily residential load during summer and winter months in Egypt.
关键词： fuel cell,load sharing strategy,hybrid system,battery bank,Photovoltaic sources
更新于2025-09-23 15:19:57
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Surfactant assisted sonochemical synthesis of zinc tungstate nanoparticles: Anode for Li-ion battery and photocatalytic activities
摘要： Herein, we report a simple, economic and low-cost surfactant assisted sonochemical synthesis of ZnWO4 nanoparticles. The structural and morphological features of nanoparticles were characterized by X-ray di?raction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy, photoluminescence (PL) spectroscopy and transmission electron microscopy. ZnWO4 had been proven to be one of the most promising electrodes for energy storage and found that the discharge capacity was of 173 mA h g?1 even after 20 cycles at 0.1C rate. In addition to this, good photocatalytic degradation e?ciency (98.6% in 120 minutes) was also achieved through Rhodamine B as a model of pollutant system.
关键词： photocatalytic activities,Rhodamine B,sonochemical synthesis,Li-ion battery,ZnWO4 nanoparticles
更新于2025-09-23 15:19:57