智能配电网互动性评估指标体系研究

建立智能配电网互动性评估指标体系是评估智能配电网互动性水平、科学指导互动性发展的基础。分析了分布式电源、微电网、储能装置、电动汽车等接入配电网改变了能量的平衡模式是智能配电网互动的驱动力,分析了智能配电网互动性的结构包括信息互动、业务互动和能量互动,分析了互动为电网、电源和用户带来的多种效益,提出实现网源荷互动应解决的关键技术,基于以上研究建立相应的智能配电网互动性评估指标。最后对智能配电网的互动性建设提出了有益建议。     

钢中非金属夹杂物控制的分析与探讨

结合近年来的有关文献，从炼钢的各个环节转炉-精炼-连铸工艺出发，分别论述了影响钢中夹杂物的因素，并提出了在各个环节中控制夹杂物的措施。     

Continuous rotary motor electro-hydraulic servo system based on the improved repetitive controller

In order to suppress the periodic interference of the continuous rotary electro-hydraulic servo motor,this paper makes the motor tracking the periodic signals with high accuracy,and improves the influence of friction interference to the performance of continuous rotary electro-hydraulic servo motor.The mathematic model of the electro-hydraulic position servo system of the continuous rotary motor was established,and the compound control method was adopted based on the repetitive control,feed forward and PID to suppress the friction interference.Through the simulation,the result confirms that the compound control method decreases the tracking error of the system,increases the robust performance of the system and improves the performance of the continuous rotary electro-hydraulic servo motor.     

Influence of argon gas pressure on the ZnO:Al films deposited on flexible TPT substrates at room temperature by magnetron sputtering

Aluminium doped ZnO thin films(ZnO︰Al) were deposited on transparent polymer substrates at room temperature by rf magnetron sputtering method from a ZnO target with Al2O3 of 2.0 wt%. Argon gas pressure varied from 0.5 Pa to 2.5 Pa with radio frequency power of 120 W. XRD results showed that all the ZnO︰Al films had a polycrystalline hexagonal structure and a (002) preferred orientation with the c-axis perpendicular to the substrate. The grain sizes of the films were 6.3-14.8 nm.SEM images indicated the ZnO︰Al film with low Argon gas pressure was denser and the deposition rate of the films depended strongly on the Argon gas pressure, increasing firstly and then decreasing with increasing the pressure. The highest deposition rate was 5.2 nm/min at 1 Pa. The optical transmittance of the ZnO︰Al films increased and the blue shift of the absorption edge appeared when the Argon gas pressure increased. The highest transmittance of obtained ZnO︰Al films at 2.5 Pa was about 85% in the visible region. The electrical properties of the films were worsened with the increase of the Argon gas power from 1 Pa to 2.5 Pa. The resistivity of obtained film at 1.0 Pa was 2.79×10-2 Ω·cm.     

软土地基水泥搅拌桩的应用

深层水泥搅拌桩多用于软土层较厚的地基加固处理工程中,由于其工艺独特,且施工方便,工期短、无公害、施工过程无振动、无躁音、不排污,造价低廉、实用可靠,在软基处理中被广泛应用并取得良好的效果。本文简要叙述了水泥搅拌桩在软基处理施工中的设计及施工应用技术。     

试论我国镀层板的市场发展趋势

分析了近八年我国镀层板的生产和消费情况,并在此基础上对镀层板行业的发展进行了粗浅探讨。     

液压锥阀气穴现象两相流仿真及实验

为研究液压锥阀存在的气穴问题,基于流体力学理论及阀芯受力分析,计算出径向偏移量的大小,在考虑阀芯发生径向偏移的情况下,借助UG软件建立不同工况下的内流场三维模型,通过ICEM-CFD软件划分网格模型,基于FLUENT软件对锥阀内流场的气穴现象进行液-气两相流仿真,获得径向偏移、半锥角、开口度、背压4个影响因素下的气穴分布及强度的变化规律.搭建可视化的液压锥阀气穴现象实验台,借助高像素的相机拍摄各工况下阀口位置的气穴图像,对仿真结果进行实验验证.结果表明:仿真结果与实验结果相吻合,径向偏移使气穴集中分布在上锥面一侧的流场.半锥角为45°时,阀芯的锥阀气穴强度变化平缓,同时半锥角为45°时,开口度为0.4 mm时气穴的强度最明显,随着开口度增大,气穴现象的气团强度逐渐减弱.综合通流能力、气穴强度,半锥角为45°是一个较优的阀芯半锥角度,同时,增大开口度和背压具有抑制气穴发生的作用.     

转炉炼钢过程中烧结返矿应用的生产实践

通过对烧结返矿加入转炉后发生的化学反应进行分解,充分分析了转炉炼钢条件下反应的热力学条件和动力学条件,总结了返矿有效成分分解速率以及成渣速率的影响因素,找出影响返矿使用量的限制性环节;通过研究烧结返矿对转炉渣系的影响,以及对"铁质渣系"向"钙质渣系"转变过程的影响,制定出添加返矿时机与数量方案,经过实践取得了良好的效果。     

基于摩擦正交实验的连续回转电液伺服马达定子材料的选择

为了降低摩擦对连续回转电液伺服马达低速性能的影响,根据马达定子及叶片的耐磨性要求,从多种常用于马达定子的材料中筛选出3种材料,采用正交实验设计思想,在不同硬度、表面粗糙度及不同压力的情况下,利用MPX200型盘销式摩擦试验机进行摩擦磨损实验,通过极差分析方法得到对摩擦系数影响最大的因素为定子内表面粗糙度;并利用Dimension 3100型原子力显微镜(AFM)观察分析了3种材料的磨损表面.结果表明,定子材料为Cr12MoV,叶片材料为W18Cr4V时,其摩擦系数及磨损量最小,Cr12MoV磨损表面呈轻微的犁沟现象,符合马达定子工况要求,为大排量超低速连续回转电液伺服马达的设计及加工提供了参考依据.     

保障舒适度的城市建筑电力节能优化

提高城市建筑用电系统集控的智能化水平是低碳建筑、节能减排的重要途径,而舒适是城市建筑的重要功能之一,将舒适与节能相结合研究城市建筑的电力节能优化具有重要意义。分析城市建筑空调、照明和电梯三类用电系统的能耗组成,建立相应的能耗指标。研究城市建筑舒适度的内涵,并分析舒适度随季节、天气、温度、人流量等因素变化所带来的不确定性,在此基础上,建立热舒适度、光舒适度和乘梯舒适度指标。分析城市建筑节能优化是具有不确定性因素的优化问题,提出节能不以降低用户舒适满意度为代价,建立以用电系统总能耗最小为目标函数,以舒适度为满足给定置信度水平的机会约束条件的优化模型。采用改进PSO算法对优化模型进行求解。通过算例分析,验证本文建立的保障舒适度的城市建筑节能优化模型及优化算法的有效性。