Considering effects of major factors on root section stresses , 2d and 3d dynamic finite element models are accurately established and then the history of both the stresses - loads at the test - points and the deflection - loads at the loading points are evaluated 综合分析影响齿根应力的重要因素的基础上,创建了精确的二维和三维动态有限元模型,计算出齿根危险截面测点的应力历程和受载点的变形历程。
Therefore , the model presented in this paper is more accurate to simulate faults of distribution network and the outage situation of load points , and reliability risk indices and reliability worth indices can be calculated according to different dispatching strategy 本文提出的模型在模拟配电网的故障和负荷点停电情况方面更加真实,并可以评估不同的调度策略可靠性风险指标和可靠性效益指标的影响。
The practical situations of system operations are considered in this paper . based on the enumeration of the cut sets for the load point interruption , load transition character , maintenance of devices , active failure mode and overload of transmission line are all discussed 该方法考虑了系统运行的实际情况,列举引起负荷点停电事件割集,还考虑了负荷点供电的转移特性,网络元件的计划检修和主动性故障使评估过程更加合理和有效。
( 4 ) reliability indexes of system and load point are analyzed , such as lolp ( loss of load probability ) , flol ( frequency of loss of load ) , dlol ( duration of loss of load ) , lole ( loss of load expectation ) , edns ( expected demand not supplied ) and eens ( expected energy not supplied ) 对全网及各负荷点的可靠性指标如系统失负荷概率lolp 、失负荷频率flol 、失负荷持续时间dlol 、失负荷期望lole 、电力不足期望edns 、供电量不足期望eens等进行了计算分析。
And the displacement control of the leaf spring center was transferred to the displacement at load point . then after the load step options configuration , the leaf spring stress circulation under cycle loadings was calculated . the model was validated by the result compare between the rigid extracted from the simulation results and the one out of the rigid test of the leaf spring 使用加载头和簧片的接触行为来模拟加载状况,并将对簧片中心的变形控制转换为对加载点的位移约束,然后利用载荷步选项配置完成一个载荷循环,由此计算出加载阶段下钢板弹簧内部的应力循环。
Based on the profound study of the operation of urban - network system , this thesis estimate that the establishment of the reliability index should be considered from two aspects namely load point and the whole system , that is they not only describe the operation characteristics of the system , but also image the characteristics of the interruption to the users 本文在研究城网系统运行特点以及国内外可靠性指标体系的基础上,确立了城网系统可靠性指标的制定应从用户负荷点和系统这两个方面来考虑,即它们不仅要能反映系统的运行特性,也应当是在用户侧有意义的。
According to the physical distance , optimal substations location can be selected , and in sequent a load point is assigned to a specific service area . thus the optimal feeder planning can be determined . substation location requires not only making the investment of substations and feeders minimum but also meeting the demands such as load , lan 变电所选址除了要做到变电所、馈线投资省、运行费用低,还要满足负荷、用地飞地形地质、线路走廊、交通、气象、防洪、防污、与城乡建设发展规划相一致等各方面的要求。
We can take into account the opinion of electric experts which greatly affected the result . with gis we can obtain element data such as coordinate of load , distance from one load to another load . a shortest - path algorithm based upon dynamic programming is used in this paper to determine the distance between a load point and a substation along the city streets which we called generalized euclid distance 以每一小区的电力负荷预测值作为需求量,将数据绑定到每一小区的左上节点(小区四周每一个十字路口都可以看作一个节点) ,可将每一个节点,或根据土地规划约束将其中的部分节点将明显不可行的源位置排除掉后的节点,作为可能建变电所的位置。
According to the existing equipment status on jiafeng station of houma - yueshan line and its connected sihe loading point , as well as the added loading capacity required for the sihe loading point , the essay puts forward the reconstruction plan of sihe loading point and jiafeng station , and makes qualitative and quantitative analysis on their benefits with and without reconstruction 摘要依据侯月线嘉峰站及与其接轨的寺河装车点心的既有设备概况和寺河装车点需要增加的装车能力,提出了寺河装车点与嘉峰站的改造方案,并对改造前后的效益作了定性、定量的分析。
Secondly , their aims are made the investment of substations , feeders or running cost of electric power system minimum . but they do n ' t take into account of land utilization , street accessibility of right of way , etc . , but demands of electric power system . generally , a straight line distance , namely , euclid distance , was used for calculating the distance between a load point and a substation , which is a straight forward but non - practical way for most planning techniques 其次受研究工具的限制,这些模型以工程投资、运行费用等最小为目标,仅能考虑导线载流量、电压降等电力系统技术约束条件,简化略去了用地限制、街道可达性等重要的自然约束条件,且求解这些模型的前奏是计算负荷点到变电所的欧几里得距离(直线距离) ,简便但不切合实际(这一点在城市电网规划中尤其重要) ,因此较难给出技术上可行的最优解。