振镜激光飞行焊接技术在新能源储能模组生产中的应用研究

随着新能源技术的不断进步,新能源储能模组装备的生产效率显得尤为重要。提出了一种基于振镜激光飞行焊接技术的解决方案。该方案通过设计连贯的生产设备,并引入振镜激光飞行焊接技术。振镜激光飞行焊接技术具有非接触性、高精度、动态运行等优势,能够有效缩短加工时间,提高产品质量,降低人工成本,并推动新能源产业的发展。主要论述新能源储能模组的生产设备、生产工艺路线以及振镜激光飞行焊接的优势等,经过现场调试及工艺试验,掌握了振镜激光飞行焊接核心技术,实现了新能源储能模组的稳定高效应用。并验证了其在新能源储能模组生产过程中的可行性。

分布式光伏电站功率预测与储能模组设计研究

分布式光伏电站功率预测和储能模组设计是人工智能技术在光伏发电系统中应用的重要研究方向。研究设计分布式光伏电站功率预测和储能模组,不仅能够提高光伏发电系统的效率和经济效益,还可以推动可再生能源技术的发展和应用。该文对广域气象资源数据做IDW插值运算,获取光伏电站所需要的气象要素,应用线性回归算法获取光伏电站功率预测值,采用经典R-C电路模型并应用PID控制算法,实现了对基于分布式光伏电站功率预测的储能模组充放电功率进行控制并合理储能的目标,以期提高光伏发电系统的效率和经济效益,推动可再生能源技术的发展和应用。

储能模组失效分析及结构优化研究

目前行业内通过对锂电池模组循环特性的研究,确定影响模组循环性能的主要因素是模组膨胀力。经研究,发现了储能模组循环衰减特性的失效机理,并且通过改善储能模组结构能够大幅度减小模组膨胀力的增大和延长模组的循环寿命。首先,从失效机理上准确识别因果关系和相关关系;其次,提供一种电芯间泡棉尺寸及粘接位置的确定方法,从而优化储能模组结构设计。最后,以磷酸铁锂280 Ah电芯1并8串(1P8S)储能模组为研究对象,堆叠1并8串(1P8S)常规储能模组1-1、1并8串(1P8S)优化储能模组2-1进行对比实验。通过在环境温度25℃,循环制式为阶梯充电/0.5 C (140 A)放电的条件下进行模组循环测试。结果表明,优化储能模组2-1在充电末端的平均压差降低了24%,在放电末端的平均压差降低了37.7%;优化储能模组2-1在充电末端的平均温差降低了约5℃,在放电末端的平均温差降低了约6℃。且优化储能模组2-1的容量保持率曲线亦优于常规储能模组1-1。

含低压储能模组的光伏并网逆变器研究

针对光伏发电功率波动的问题,提出一种带储能模组的隔离式光伏并网逆变拓扑结构。利用储能模组存储多余的电能,实现平滑并网功率和光伏电池板的最大功率跟踪。针对提出的拓扑结构,分析其工作原理和开关状态,讨论储能模组剩余电量的控制算法,建立控制算法和调制策略。实验结果表明,提出的拓扑并网逆变器可实现内部直流电压控制,完成并网运行,提出的控制策略和调制算法正确可行。

基于光伏出力特性的分布式光储系统优化调度策略

随着我国能源结构的转型升级,太阳能发电愈发受到重视。然而,大规模分布式光伏并网会引起电网的功率波动。储能的介入有助于系统调峰/调频。基于此,提出一种分布式光储系统联合优化调度方法。首先,从经济性和技术性角度构建分布式光储系统优化调度模型,以有功功率波动方差最小为目标,对储能模组的充放电功率进行优化。其次,基于光伏出力预测提出实时调度策略,提升分布式光储系统并网的有序性,有助于平抑电网负荷波动以及调节负荷峰谷差。最后,通过设计具体仿真算例验证了方法的可行性。

SIS型热熔压敏胶的粘接性能及动态流变行为研究

以SIS(苯乙烯-异戊二烯-苯乙烯三嵌段共聚物)作为基体树脂制备HMPSA(热熔压敏胶)。研究了不同类型增塑剂与SIS基体的相容性对压敏胶(PSA)性能及动态流变行为的影响,并探讨了PSA性能与动态流变行为之间的关系。结果表明:当增塑剂与SIS中PS(聚苯乙烯)相的相容性较好时,相应HMPSA在低频(1 Hz)时的储能模量较低,初粘力较好;当增塑剂与SIS中PI(聚异戊二烯)相的相容性较好时,相应HMPSA在高频(100 Hz)时的损耗模量较高,剥离强度较大。

Experimental Study on the Viscoelastic Behaviors of Debris Flow Slurry

The rheological properties of most liquid in nature are between liquids and solids, including both elastic changes and viscosity changes, that is socalled ＂viscoelastic＂. Dynamic oscillatory test was used to quantitatively study the distinct viscoelastic behaviors of debris flow slurry in the shear stress conditions for the first time in this study. The debris flow slurry samples were from Jiangjiagou Ravine, Yunnan Province, China. The experimental results were found that at the low and middle stages of shearing, when the angular velocity 09〈72.46 s-1, the loss modulus （G was greater than the storage modulus （G3, i.e. G＂〉G＇. At the late stage of shearing, when the angular velocity co-72.46 s-x, the storage modulus was greater than or equal to the loss G = G, tan -〈 1 （where phase-shift modulus, i.e. ＇ 〉 ＂ angle 5=G＂,/G3, and the debris flow slurry was in a gel state. Therefore, the progress of this experimental study further reveals the mechanism of hyperconcentrated debris flows with a high velocity on low-gradient ravines.

Effects of Alginate Gel on Rheological Properties of Hair-tail (Trichiurus lepturus) Surimi

Effects of alginate gel at different concentrations on rheological properties of hair-tail (Trichiurus lepturus) surimi were investigated. Alginate gel (1% - 3%) exhibited enhanced effects, especially when alginate gel concentration increased. The rheological properties of mixture samples were studied by the time sweep, frequency sweep and temperature sweep. The critical strain values of the mixture samples for the onset of non-linear viscoelasticity were about 5%. The storage modulus G' of the mixture samples increased with time for 4 h. The frequency sweep showed that G' was greater than G" for all the mixture gels with different alginate gel concentrations, and values of both n' and n" for all samples were low (<0.2), these constants corresponding to G' and G", and indicating the elasticity of mixture gels. The values of storage modulus G' decreased during heating process and increased with decreasing temperature.

Evaluation model for safety capacity of chemical industrial park based on acceptable regional risk

The paper defines the Safety Capacity of Chemical Industrial Park(SCCIP) from the perspective of acceptable regional risk. For the purpose of exploring the evaluation model for the SCCIP, a method based on quantitative risk assessment was adopted for evaluating transport risk and to confirm reasonable safety transport capacity of chemical industrial park, and then by combining with the safety storage capacity, a SCCIP evaluation model was put forward. The SCCIP was decided by the smaller one between the largest safety storage capacity and the maximum safety transport capacity, or else, the regional risk of the park will exceed the acceptable level.The developed method was applied to a chemical industrial park in Guangdong province to obtain the maximum safety transport capacity and the SCCIP. The results can be realized in the regional risk control of the park effectively.

Rheological properties of polyvinyl butyral/Pluronic F127/PEG200 blend systems

The influence of temperature and mass fraction of Pluonic F127 on the rheological properties of polyvinyl butyric （PVB）/Pluronic F127/polyethylene glycol （PEG） 200 blend systems was investigated by a rotational rheometer with parallel plates. The results show that the blend systems approach homogeneous state at 140, 150 and 160℃while the rheological properties of the blend systems significantly deviate from the homogeneous systems at 120℃. Shear thinning behavior is observed for all the blend systems at different temperatures and is enhanced by increasing Pluronic F127 content. The complex viscosity, storage modulus, loss modulus, zero-shear activation energy and flow recovery of the blend systems increase with the increase of Pluronic F127 content. There is a crossing point for the loss modulus and the storage modulus of each sample at high frequency, which is called specified frequency （SF）. The loss modulus is larger than the storage modulus when the frequency is less than the SF, and when frequency is more than SF, the loss modulus is smaller than the storage modulus.

Modular High-Power Electronics for a High-Speed MLC Flywheel Energy Storage System

The operation of a motor drive for high-power, high-speed applications, especially for the permanent-magnet synchronous AC motors with regeneration capability is presented. Power system utilizes a SVHPWM （space-vector-based hybrid pulse width modulation） for a reduced harmonic distortion and switching loss. Associated electromagnetic interference mitigation and cooling requirements are significantly reduced. Voltage source inverter drives a three-phase MLC200 flywheel. The modularity of the proposed topology also simplifies overall system design and manufacturability. The system topology and control strategy are discussed. Simulation results are presented to illustrate the harmonic distortion and switching loss reduction and reduced line current ripple.

Along Road Height Interpolation Based on Discrete Elevation Points

The simulating exactly compared with realty of ground surface to run a model is more and more highly required. In the real, terrain of the earth surface is always complicated by the natural and human made ground objects. Because of limitation of collecting and storing technologies in the past time, data are usually not detailed so that the data can not be full for the simulation. Besides computing power and simulation increase more day by day, the increasing requirements more detailed of topography surface simulation is a demand. In simulated flooding phenomenon or phenomena related to energy and momentum of water flow, the linear objects of ground surface such as roads, dikes, dams, etc. need to have their vertical dimension along continuously. However, these datas have often no height information alternately, there are only discrete elevation points that are extracted from topographic maps. Consequently, the demand of a suitable method for linear objects height interpolation is necessary. This paper aims to provide a method and evaluate its accuracy to meet this requirement.

Design and development of real-time query platform for big data based on hadoop

This paper designs and develops a framework on a distributed computing platform for massive multi-source spatial data using a column-oriented database(HBase).This platform consists of four layers including ETL(extraction transformation loading) tier,data processing tier,data storage tier and data display tier,achieving long-term store,real-time analysis and inquiry for massive data.Finally,a real dataset cluster is simulated,which are made up of 39 nodes including 2 master nodes and 37 data nodes,and performing function tests of data importing module and real-time query module,and performance tests of HDFS's I/O,the MapReduce cluster,batch-loading and real-time query of massive data.The test results indicate that this platform achieves high performance in terms of response time and linear scalability.

Study of Water Injection Efficiency through Modern Geological-Mathematical Models in Guneshly Field

Guneshli is a unique oil field for.its huge oil reserves. Fasila layer is one of the main productive series with more than 3,300 tons of oil production per year. It is an important task to continue efficently develop this object. Development of Fasila was analysed based on geological-mathematical models, production performance was predicted through use of advanced ＂evolution＂ modeling program. In addition, the impact of water injection from deep water Guneshly was identified and relavant proposals were put forward.

Modeling and Controlling of an Active Power Filter Using Photovoltaic System with Reduced Energy Storage Capacitor

A novel three-phase active power filter （APF） circuit with photovoltaic （PV） system to improve the quality of service and to reduce the capacity of energy storage capacitor is presented. The energy balance concept and sampling technique were used to simplify the calculation algorithm for the required utility source current and to control the voltage of the energy storage capacitor. The feasibility was verified by using the Pspice simulations and experiments. When the APF mode was used during non-operational period, not only the utilization rate, power factor and power quality could be improved, but also the capacity of energy storage capacitor could sparing. As the results, the advantages of the APF circuit are simplicity of control circuits, low cost, and good transient response.

Natural convection heat transfer of molten salt in a single energy storage tank

Heat transfer in molten salt in a cylinder tank is studied via simulation and experiment to obtain its natural convection heat transfer in a single energy storage tank. Simulation and experimental results show that the natural convection heat transfer of water in a cylinder tank fits well with Garon＇s correlation. However, significant deviations occur when Garon＇s correlation is used to predict the natural convection heat transfer of molten salt because of its high viscosity and low thermal conductivity. However, the simulated data of the natural convection heat transfer of molten salt fit well with those of the experimental results Thus, a correlation that considers the effect of variable physical properties is proposed in this study to predict the natural con- vection heat transfer of molten salt. The deviation of the present data from the proposed correlation is less than ＋20%. The re- sults of this study can serve as a basis for the design of single energy storage tanks.

Elastoplastic damage model for concrete based on consistent free energy potential

The aim of this study is to formulate an appropriate free energy potential for inelastic behavior of concrete and construct an elastoplastic damage model on a more rational basis. The concept of effective plastic energy storage rates is proposed, which are conjugate forces of hardening variables in an undamaged configuration. Then an analogy between the evolution of harden- ing variables and that of a plastic strain is used to postulate the formulation of plastic free energy. This formulation reflects the specific characteristics of a certain plasticity model, so it can serve well as a thermodynamic link between plasticity and dam- age. By combination of the general formulation of free energy with the double hardening plasticity theory and two-parameter damage expression, a thermodynamically well-founded elastoplastic damage model for concrete is constructed. The operator split algorithm is emploved, and the numerical simulations a^ree well with a series of material tests.