城市燃气管网事故工况模拟及调度分析

发布时间：2018-05-10 05:27

  本文选题：燃气管网 + 事故工况　； 参考：《哈尔滨工业大学》2015年硕士论文

【摘要】：随着我国天然气工业的迅猛发展,城市燃气也处于迅速发展时期,燃气管网规模越来越大,作为城市重要的基础设施,在生活和生产中发挥着不可或缺的作用。随着经济的建设和社会的进步,城市供气安全问题越来越引起社会关注,然而频发的管网事故,为城市供气系统的安全性带来了严峻的挑战。现有的城市燃气中低压管网,除气源处外,其它位置的监测点数量极为有限,如何掌握整个管网在事故发生后的水力工况,对事故的评估和管网的调度意义重大,也是本文要解决的问题。本文主要基于遗传算法解决事故工况水力分析及气源优化调度问题。本文对燃气管网事故后的水力工况进行模拟和评估。基于“压力驱动型”水力模型模拟燃气管网的事故工况,将各节点实际供气量与节点压力相关联,建立节点实际供气量的分段函数,运用遗传算法求解管网事故工况水力计算模型,得到各节点流量和压力分布情况,分析管网事故的影响范围和程度,该方法有别于传统管网水力计算中的事故工况分析。针对多气源燃气管网,建立管网在某个气源事故下的失效程度评价模型,对气源事故的影响进行综合评估。运用管网事故工况水力分析结果指导管网调度问题。以提高气源事故下管网总供气量、提高重点用户供气保证系数和尽量降低气源出口压力为优化目标,以管网水力计算基本方程组的要求、各气源对总供气量的限制和管网可承受最大压力的限制为约束条件,以各气源出口压力为决策变量,建立了气源事故下燃气管网的优化调度模型,并采用改进的非支配排序遗传算法NSGA-Ⅱ对模型进行求解,得到某个气源事故下最优的调度策略。本文编写了城市燃气管网水力计算软件,自动读取Auto CAD管网拓扑信息,进行正常工况的管网水力计算,分析事故发生后管网的水力工况,自动输出管网水力计算简图、管网节点压力分布图,能够进行工程量统计、结果的报表输出和图像输出,实现了管网水力工况的可视化功能,经对比分析,精度达到要求。
[Abstract]:With the rapid development of natural gas industry in China, urban gas is also in a period of rapid development. The scale of gas pipeline network is becoming larger and larger. As an important infrastructure of the city, it plays an indispensable role in life and production. With the development of economy and society, more and more attention has been paid to the safety of urban gas supply. However, the frequent network accidents have brought severe challenges to the safety of urban gas supply system. The number of monitoring points in other places is very limited except for the gas source. How to master the hydraulic condition of the whole pipeline network after the accident is of great significance to the assessment of the accident and the regulation of the pipe network. It is also the problem to be solved in this paper. In this paper, the genetic algorithm is used to solve the problem of hydraulic analysis and gas source optimization. This paper simulates and evaluates the hydraulic condition of gas pipe network after accident. Based on the "pressure-driven" hydraulic model to simulate the accident condition of the gas pipe network, the actual gas supply volume of each node is correlated with the node pressure, and the piecewise function of the actual gas supply rate of the node is established. Using genetic algorithm to solve the hydraulic calculation model of pipe network accident condition, the distribution of flow and pressure at each node is obtained, and the influence range and degree of pipe network accident are analyzed. This method is different from the accident condition analysis in traditional hydraulic calculation of pipe network. A model for evaluating the failure degree of multi-source gas network under a gas source accident is established, and the influence of gas source accident is evaluated synthetically. The problem of pipe network scheduling is guided by the result of hydraulic analysis on the accident condition of pipe network. In order to improve the total gas supply of the pipeline network under the gas source accident, to increase the gas supply guarantee coefficient of the key users and to reduce the outlet pressure of the gas source as far as possible, the requirements of the basic equations for hydraulic calculation of the pipe network are taken as the optimization goal. The limitation of the total gas supply and the maximum pressure of the pipe network are the constraint conditions. Taking the outlet pressure of each gas source as the decision variable, the optimal dispatching model of the gas pipeline network under the gas source accident is established. An improved non-dominated sorting genetic algorithm NSGA- 鈪，

本文编号：1867966