考虑天然气N-1的多能流系统静态安全耦合分析

Static Security Coupling Analysis of Multi-energy Flow System Considering Natural Gas System N?1 Contingency

以综合能源系统为代表的多能流系统是推动低碳高能效能源转型的主要措施,但多种能流系统联合运行所带来的安全问题也不容忽视。该文针对多能流系统的静态安全问题,提出以天然气N?1事故作为预想事故集,研究适用于多能流系统的静态安全耦合分析理论和方法。提出考虑天然气管道N?1开断的预想事故集,并结合牛顿拉夫逊算法对开断事故进行模拟;利用标准矩阵模型分析能量枢纽在故障跨能流传播中起到的耦合机理;在静态安全耦合分析中以状态转移过程描述天然气管网的动态特性,评价故障的严重性,实现对关键事故和脆弱部位的识别。算例结果验证了所提理论和方法是正确有效的。

The multi-energy flow system represented by the integrated energy system is the main measure to promote the transformation of low-carbon and energy-efficient energy.However,the security problems caused by the joint operation of multiple energy flow systems should not be ignored.In view of the static security problem of multi-energy flow system,this paper proposed the natural gas N-1 event as the contingency set and discussed the static security coupling analysis theory and method for multi-energy flow systems.First,the contingency set considering the breaking of the natural gas pipeline N-1 was proposed.And the breaking event was simulated by the NewtonRaphson algorithm.Then the standard matrix model was used to analyze the coupling mechanism of energy hubs in the process of fault cross-energy flow propagation.Finally,the state transition process was used to describe the dynamic characteristics of the natural gas pipeline networks in static security coupling analysis and evaluated the severity of the impact of a fault on the operational safety of the system and enable identification of critical events and fragile parts.The results of the example verify that the proposed theory and method are correct and effective.