含多EH参与的电-气区域综合能源系统多能流收敛性调整

Multi-energy flow convergence adjustment of electricity-gas regional integrated energy system considering EH participation

电-气区域综合能源系统含多个耦合元件能源集线器(energy hub,EH),容易出现多能流计算不收敛的问题.该文基于牛顿-拉夫逊法解耦求解,分析出电-气区域综合能源系统多能流计算不收敛的机理,提出含多EH参与的多能流收敛性调整方法.首先解耦判定电力系统和天然气系统能流计算的收敛性,再根据识别出的不平衡量类型和关键节点采用相应的收敛性调整方式:若为有功功率不平衡采用EH平衡机调整方式,若为无功功率不平衡或轻微有功功率不平衡则采用电力节点类型转换调整方式,若为流量不平衡则采用天然气节点压力调整方式.该方法可解决有功无功强耦合给能流不收敛调整带来的困难,且简化了含耦合元件的多能流收敛性调整.算例系统应用验证了所提方法的可行性和有效性.

The electricity-gas regional integrated energy system contains multiple energy hub(EH)units,so it is prone to non-convergence of multi-energy flow calculation.In this paper,the mechanism of multi-energy flow calculation non-convergence of the electricity-gas regional integrated energy system is analyzed based on decoupling solution using Newton-Raphson method,and then a convergence adjustment method for multi-energy flow with multi-EH participation is proposed.First,the energy flow calculation convergence of the power system and the natural gas system are decoupling judged.Then,the corresponding convergence adjustment method is used according to the identified imbalance variable types and key nodes.If it is the active power imbalance,the EH balancer adjustment method is adopted.If it is the reactive power imbalance or minor active power imbalance,the power node type conversion adjustment method is adopted.If it is the natural gas flow imbalance,the natural gas node pressure adjustment method is adopted.This method can solve the difficulties caused by the strong coupling of active and reactive power to the energy flow non-convergence adjustment,and can simplify the convergence adjustment of the multi-energy flow with coupling elements.Finally,the feasibility and effectiveness of the proposed method is verified by example system application.