基于改进算法的城市燃气输配管网功能分析

The performance analysis of urban gas transmission and distribution based on improved algorithm

传统燃气管网功能分析算法采用恒定不变的节点流量作为约束条件来求解节点流量平衡方程组,针对由此产生的管网中部分节点压力出现"负压"的问题,提出基于节点压力波动的节点三态供气工作模式的改进燃气管网功能分析算法,在功能分析过程中,考虑节点流量与节点压力的关系,注重节点获得的实际流量随节点压力而变化的动态响应过程。采用双气源的中压管网验证了改进算法的合理性和收敛性,结果表明:采用改进算法计算求得的燃气管网中某些节点的压力高于传统算法的计算结果,计算管段流量的迭代次数亦低于传统算法的迭代次数。实例证明了该改进算法优于传统的管网功能分析算法。

The traditional gas network performance analysis algorithm is based on the constant nodal flux as the constraint conditions to solve the nodal flux balance equations,which results in negative pressure in partial nodes.This paper presents an improved algorithm which is based on the nodal tri-state gas supply working mode of nodal pressure fluctuation.In the performance analysis,the relation between the nodal flux and the nodal pressure is considered.The dynamic response of the actual nodal flux which depends on the nodal pressure is also considered.The improved algorithm is verified to be reasonable and convergent by double gas supply medium pressure gas network.The result shows that the partial nodal pressure from the improved algorithm is larger than that of the traditional algorithm,and the iteration times is shorter than that of the traditional method.The computation case identifies that the improved algorithm is better than the traditional algorithm.