基于遗传算法的环形供热网可及性分析

针对集中供热环形网提出了可及性分析的概念，建立了相应的数学模型。在算法上，针对这一复杂的多变量非线性优化问题的特点，提出关于环形网的几个定理，并在此基础上对问题进行简化处理，采用最佳保留机制的变形标准遗传算法ＶＣＧＡ进行求解，利用遗传算法的强鲁棒性寻找问题空间的全局最优解。为弥补遗传算法后期局部搜索不力的缺陷，在ＶＣＧＡ搜索的基础上，采用直接搜索的方法进行局部微调，形成了一种混合算法。本文提出的可及性分析方法，可以为环形供热网的运行调节和优化调度提供指导，为系统的扩容改造提供依据。本方法已经在几个集中供热网等工程中具体应用。

Accessibility analysis of district heating loop-networks based on genetic algorithms

Aimed at district heating loop networks, a concept of accessibility analysis was established, and a mathematical model was set up, which is a max min optimum problem with nonlinear constraints. Three theorems on loop networks were presented, based on which the model was simplified. A new procedure to solve the problem based on variants of canonical genetic algorithms (VCGA) was introduced in detail. According to the accessibility analysis, the rebuilding method and the optimum operating module can be obtained to loop networks. A conclusion was drawn in engineering practices that great pumping energy saving opportunities exist to a loop network if valves in each loop can be adjusted suitably with accessibility analysis. This procedue were applied in several large district heating networks in China.