考虑压缩机不同运行状态的IES气网潮流分布式计算方法

Distributed algorithm for the power flow calculation of gas network in integrated energy system considering different operation states of compressors

压缩机运行状态的改变会造成气网工况变化,进而对电-气-热综合能源系统的稳态潮流产生影响。为求解压缩机不同运行状态下的综合能源系统气网潮流,文中分别对综合能源系统各子网络和能量耦合环节建模。考虑压缩机5种工作模式和2种驱动方式,针对含有多台不同运行状态压缩机的天然气网络,基于牛顿-拉夫逊法,提出保留压缩机管道整体求解的气网潮流计算方法,并拓展一种分离压缩机管道等效求解方法,以分布式计算方法顺序求解综合能源系统潮流。通过2个算例,验证了所提保留压缩机管道整体求解方法的精确性和有效性,弥补了现有气网潮流计算模型无法处理复杂气网工况且收敛性、通用性差的缺点,揭示了压缩机运行状态的改变对综合能源系统潮流的影响。

The change in the operating state of the compressor will cause the variety of working conditions in gas network,affecting the steady-state power flow of electric-gas-heat integrated energy system.In order to calculate the gas network power flow of the comprehensive energy system under different operation states,the sub-networks and energy coupling links of integrated energy system are modeled respectively.Considering five working modes and two driving modes of the compressors,based on Newton-Raphson method,an integrated power flow calculation method which reserves the pipelines of compressors is proposed and an equivalent solution method which separates the pipelines of compressors is developed for gas network with multiple compressors under different operation states.The power flow of integrated energy system is calculated by distributed algorithm.The accuracy and effectiveness of the proposed integrated power flow calculation method are verified through two examples,which remedies the disadvantages of existing power flow calculation models of gas network that cannot deal with complex working conditions in gas network and lack convergence and universality.Then the impacts of the change in compressor operation states on power flow of integrated energy system are revealed.