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- 2018
- Battery energy storage systems
- techno-economic modeling
- photovoltaics
- net-metering
- solar power
- PV-wind-diesel-battery system
- Capacity optimization
- PSO algorithm
- Economic and technical indexes
- photovoltaic generation
- Electrical Engineering and Automation
- Aristotle University of Thessaloniki
- Wuhan university of technology
- University of Calgary
- Western Macedonia University of Applied Sciences
- Technological Educational Institute of Thessaly
- SINOMACH Intelligence Technology Research Institute
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Methods for <i>operando</i> coherent X-ray diffraction of battery materials at the Advanced Photon Source
摘要： Bragg coherent X-ray diffraction imaging has become valuable for visualization of the structural, morphological and strain evolution of crystals in operando electrode materials. As the electrode material particles (either in a single-crystal form or an aggregation form of single crystals) are evenly dispersed and randomly oriented in the electrode laminate, the submicrometer-sized coherent X-ray beam can be used to probe the local properties of electrode material crystals using two approaches. Coherent multi-crystal diffraction provides collective structural information of phase transitions in tens of crystals simultaneously as well as the individual behavior from single crystals, which are oriented at the Bragg condition in the X-ray illumination volume. Bragg coherent diffractive imaging enables one to monitor the evolution of the morphology and strain in individual crystals. This work explores and highlights the Bragg coherent X-ray diffraction measurements of battery electrode materials in operando conditions at the 34-ID-C beamline at the Advanced Photon Source. The experiment is demonstrated with NaNi1/3Fe1/3Mn1/3O2, a sodium-ion cathode material loaded in a half cell. The paper will discuss, in detail, the beamline setup, sample mounting and handling, alignment strategies and the data acquisition protocols.
关键词： experimental protocols,in operando characterization of battery materials,Bragg coherent diffractive imaging,coherent multi-crystal diffraction
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Reliability Assessment of PV Inverters with Battery Systems Considering PV Self-Consumption and Battery Sizing
摘要： To ensure the cost-competitiveness of Photovoltaic (PV) with integrated Battery Energy Storage Systems (PV-BESS), a highly reliable operation is demanded. The PV inverter has been reported as one of the reliability-critical components in the system, whose failures can lead to a severe negative impact on the cost of PV energy. Therefore, improving PV inverter reliability has high potential for the cost reduction of the PV-BESS. This paper thus investigates the impact of battery operation on the PV inverter reliability. A 6-kW residential PV-BESS in Germany is considered, where a self-consumption scheme is adopted. The evaluation results reveal that the reliability of the PV inverter is strongly affected by the battery operation. More specifically, the PV inverter loading is decreased significantly during the battery charging, which results in an improvement in the PV inverter reliability. In addition, the battery system parameters, such as battery capacity and battery converter power rating, also affect the PV inverter loading, whose impact on the PV inverter reliability has been analyzed.
关键词： battery,self-consumption,mission profile,lifetime,PV inverters,reliability
更新于2025-09-04 15:30:14
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Understanding Interactions between Lead Iodide Perovskite Surfaces and Lithium Polysulfide toward New-Generation Integrated Solar-Powered Lithium Battery: an ab-Initio Investigation
摘要： Energy conversion devices such as perovskite solar cells and energy storage devices such as lithium sulfur battery flourish in these decades owing to their capabilities to deliver large power conversion efficiency and store superior specific energy, with potentials to solve the global energy crisis and environmental issues. Compared with conventional energy conversion devices and energy storage devices that have limited performances, integrating the energy conversion devices and energy storage devices into a single unit is advantageous to present enhanced performance in multiple applications and satisfy the commercial needs. However, further development of the integration relies on a deeper understanding of the interactions between the functional materials in the energy conversion devices and energy storage devices. In this study, we try to bridge the gap by investigating the interactions between the light absorbing halide perovskite material CH3NH3PbI3 and the lithium polysulfide intermediates (S8, Li2S8, Li2S6, Li2S4, Li2S2 and Li2S) formed during the charging/discharging processes in lithium sulfur batteries via ab-initio calculations. We find that the CH3NH3PbI3 and lithium polysulfide species have decent interactions, with the lithium polysulfide species residing stably on the halide perovskite surfaces and such interactions are strengthened by the charge transfer characters between the adsorbates and the adsorbents. We propose that the light absorbing halide perovskite materials represented by the CH3NH3PbI3 absorber exhibit potentials to be integrated into the lithium sulfur battery cathode to serve as an anchoring material to harness the solar power and mitigate the battery degradation problem, since the dissolution of intermediate lithium polysulfide (Li2Sn) is a severe problem in lithium sulfur batteries. The resulting integrated device is superior in capturing the solar energy due to the presence of the halide perovskite moiety and exhibits a large specific energy, low cost and low toxicity due to the sulfur materials. The comprehensive understanding of the light absorbing halide perovskite material and the lithium polysulfide species in this theoretical work forms a foundation for the further development and commercialization of integrated device that captures solar energy and can be charged/discharged efficiently.
关键词： perovskite solar cells,energy storage,energy conversion,integrated device,lithium polysulfide,lithium sulfur battery,ab-initio calculations,CH3NH3PbI3
更新于2025-09-04 15:30:14
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Energy Management System for the Photovoltaic Battery Integrated Module
摘要： Given the complementary nature of photovoltaic (PV) generation and energy storage, the combination of a solar panel and a battery pack in one single device is proposed. To realize this concept, the PV Battery Integrated Module (PBIM), it is fundamental to analyze the system architecture and energy management. This paper focuses on selecting a suitable architecture among the different options, while also indicating the control strategy that the converters must follow to ensure appropriate performance. Also, several modes of operation for the complete system are introduced to implement energy management. For the selected DC architecture, two case studies, viz. off-grid and peak-shaving for a grid-tied system, were employed to characterize the response of the model demonstrating its utility to perform maximum power-point tracking, excess solar power curtailment, and battery charging and discharging. The proposed control and system architecture prove to be feasible for a PV Battery Integrated device such as PBIM.
关键词： integrated module,systems architecture,energy management,PV-battery
更新于2025-09-04 15:30:14
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Technoeconomic analysis of a grid-connected PV and battery energy storage system considering time of use pricing
摘要： This paper examines the technoeconomic optimization of the size of valve-regulated lead acid-type battery energy storage systems (BESSs) in order to minimize the total annual operating cost of a grid-connected photovoltaic BESS within the framework of system operational constraints, using the improved harmony search algorithm. The electricity cost is calculated using time of use pricing, where the price of energy varies according to the load demand. The concept of feed-in-tari? is discussed, where power can be bought from and sold back to the grid. A sensitivity analysis is performed for three cases: without storage, with storage and without peak load shaving, and with both storage and peak load shaving. The total annual operating cost of the system is calculated for all three cases and cost savings are compared. The simulations, performed with MATLAB, show a good optimization performance.
关键词： technoeconomic analysis,Battery energy storage system sizing,time of use pricing,peak load shaving,photovoltaic system
更新于2025-09-04 15:30:14
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The Impact of Initial SEI Formation Conditions on Strain‐Induced Capacity Losses in Silicon Electrodes
摘要： The solid electrolyte interphase (SEI) that passivates silicon surfaces in Li ion batteries is subjected to extremely large mechanical strains during electrochemical cycling. The resulting degradation of these SEI films is a critical problem that limits the cycle life of silicon-based electrodes. With the complex multiphase microstructure in conventional porous electrodes, it is not possible to directly measure the impact of these strains on SEI formation and capacity loss. To overcome this limitation a new in situ method is presented for applying controlled mechanical strains to SEI during electrochemical cycling. This approach uses patterned silicon films with different sized islands that act as model electrode particles. During lithiation/delithiation, the lateral expansion/contraction of the island edges applies in plane strains to the SEI. Detailed analysis of the island size effect then provides quantitative measurements of the impact of strain on the excess capacity losses that occur in different potential ranges. One key finding is that the applied strains lead to large capacity losses during lithiation only (during all cycles). Also, employing fast and slow SEI formation (first cycle) leads to large differences in the strain-induced losses that occur during subsequent cycling.
关键词： shear lag zone,lithium-ion battery,capacity loss,SEI formation
更新于2025-09-04 15:30:14
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Transparent Thin Film Solid-state Lithium Ion Batteries
摘要： Transparent electrochemical energy storage devices have attracted extensive attention for the power supply of next-generation transparent electronics. In this paper, semi-transparent thin film batteries (TFBs) with a grid-structured design have been fabricated on glass substrates using specific photolithography and etching processes in order to achieve LiCoO2/LiPON/Si structures below human eye resolution. UV-vis transmittance up to 60% have been measured for the obtained TFBs. Discharge capacity as high as 0.15 mAh has been recorded upon galvanostatic cycling at C/2 rate within 4.2-3 V voltage range for the highest transmittances. The capacity variation trend exhibits an initial phase of a gradual decrease with an average capacity loss of 0.15% per cycle, and thereafter a second phase with almost stable capacity. Particular attention has been given to the effects of architecture parameters on the TFB optical and electrochemical properties. To the best of our knowledge, this work is the first demonstration of transparent, all inorganic, thin film lithium-ion batteries. While reported studies are limited to battery structures involving liquid or polymer materials, our devices will contribute to improve form factor freedom, extend operating ranges, enhance long-term stability, and will be relevant to the integration into various optoelectronic devices.
关键词： solid state,LiPON,thin film,microfabrication,transparent battery
更新于2025-09-04 15:30:14
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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) - Implementation of Standalone PV Micro Grid with Multi-level converters for Rural Electrification
摘要： The present paper deals with a standalone micro grid for rural electrification with multilevel converters powered by PV energy solar, with large range of solar irradiance. For countries of Sub-Saharan Africa, the developed systems must have aspects of robustness, reliability, very low maintenance and affordable costs. So, the use of multilevel converter in low and medium voltage can satisfy these criteria according to the following conditions: good voltage withstand and low losses for the power switches, low total harmonic distortion of output voltage. These properties allow optimally sizing PV solar panels, battery banks, passive elements for filters, and electrical features of power components.
关键词： Multilevel Converter,Passive Filter,PV Solar,Total Harmonic Distortion,Battery,PI Controllers
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Comparison of Typical PV Module Performances Based on the Circuit Models
摘要： In PV systems, it is usually expected that power generation under varying conditions at any time should be maximum as much as possible. Therefore, it is essential to build a circuit model based on a widely used single or double diode model instantly varying conditions with minimum error under the estimation these approximate values through manufacturers' data sheet. It is fact that circuits models ease the performance analysis of PV systems if the unknown parameters are accurately estimated at various temperatures and unchanged irradiance levels or vice versa. This paper comparatively studies the performances of the two approximate circuit models for the four types of PV modules using the real-coded genetic algorithms. The results indicated that I-V characteristics obtained from the identified parameters exhibit almost similar trend with those given in manufacturers' data sheets under the same conditions. Besides, the estimated parameters obtained from using both models slightly show difference from each other and it can be said that the single diode model is solely satisfactory to model a typical PV model as long as they are accurately estimated.
关键词： single diode circuit model,PV-Battery system,double diode circuit model,genetic algorithm optimization
更新于2025-09-04 15:30:14
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Pest Control Lamp in Green Food Bases Based on Wind-solar Complementary Generation System
摘要： According to the energy complementary characteristics of wind energy and solar energy in time and space, in this study, the wind turbine and solar cells are used to design a pest control lamp in green food bases powered by a small power wind-solar complementary supply system and the intelligent controller is used to charge and discharge the batteries, realizing various protection functions. Application shows that the pest control lamp in green food bases system has the advantages of low manufacturing cost and high reliability, suitable for being used in farmland and woodland which are far from the grid.
关键词： generation system,green food bases,pest control lamp,Battery,wind turbine,solar cell
更新于2025-09-04 15:30:14