Abstract:

Optimal allocation of gas supply reliability is an important part of gas supply reliability of natural gas pipeline system.In order to study the optimal allocation scheme of gas supply reliability with the lowest cost,a cost function model based on the gas supply capacity of the pipeline system was constructed.To address the limitation of traditional intelligent optimization algorithms (e.g.,Particle Swarm Optimization) that overlook constraints during iterative updates,this research proposed a novel Exterior Penalty Function Method for optimizing gas supply reliability.This method transformed constraints in the allocation model into penalty function terms,established a revised objective function,and converted the constrained allocation problem into an unconstrained extremum problem.Applying this method to a practical pipeline system,optimal gas supply reliability allocation values were derived.The results demonstrate that the Exterior Penalty Function Method significantly reduces computational time without compromising accuracy.The allocation outcomes exhibit robust convergence and align with engineering practicality.By clarifying the optimized allocation values of unit gas supply reliability and comparing them with the current reliability,the weak units in the gas supply system can be identified,providing a scientific basis for improving the gas supply reliability of pipeline systems.

Key words: Natural gas pipeline system, Gas supply reliability, Optimize allocation, Cost function model, Exterior penalty function method

摘要：

供气可靠性优化分配是天然气管道系统供气可靠性的重要组成部分，为了研究成本最低的供气可靠性优化分配方案，构建了基于管道系统供气能力的费用函数模型；针对粒子群等传统优化智能算法更新迭代过程中未涉及约束条件，提出了一种基于外点罚函数法的天然气管道系统供气可靠性优化方法；将优化分配模型中约束条件转化为惩罚函数项，构造新的目标函数，将有约束分配问题转化为无约束极值问题；针对某天然气管道系统，基于外点罚函数法进行供气可靠性优化分配，得到了供气可靠性优化分配值。结果表明，外点罚函数法在保证精确度的同时，能够显著缩短运算时间；分配结果具有良好的收敛性且符合工程实际；通过明确单元供气可靠性优化分配值，将其与当前可靠度对比，能够识别系统供气薄弱单元，为提高管道系统供气可靠性提供科学依据。

关键词: 天然气管道系统, 供气可靠性, 优化分配, 费用函数, 外点罚函数法