Research On Fault Operation Strategy Of Integrated Energy System Based On Multi-energy Collaboration

The promotion of integrated energy systems,wide use of renewable energy and the optimization of fault handling strategies are important issues to be solved nowadays.By combining the dynamic nonlinear model of each equipment with the energy hub model of the integrated energy system,this paper establishes a dynamic simulation model of the integrated energy system including various cold,heat and electric equipment.Using this model,an economy & response time optimization strategy has been proposed.Based on this optimization strategy,a hybrid dynamic simulation platform for case analysis has been developed.Firstly,the integrated energy system is divided into three subsystems: cooling system,heat supply system and electricity supply system.Then the dynamic mathematical models of each subsystem are built respectively.Based on that,the multi-energy coupling model of the integrated energy system consisting of each subsystem is established.Secondly,the optimization operation strategy of integrated energy system considering the multi-energy coupling characteristics of integrated energy system and all usable energy supply resources in system has been modeled,and it proposes a fault state operation processing strategy consisting of fault judgement method,maximum energy supply capacity calculation,interruptible load's concept,control parameters' conversion,and so on.Finally,a self-developed Trnsys & Matlab hybrid dynamic simulation platform is used to simulate three situations: normal operation,operation with fault,shutdown,the results show that the integrated energy system can meet the energy supply demand through multi-energy collaboration method.At the same time,the comparison between the economy & response time optimization strategy and the economic optimization strategy is made,the result shows that compared with the economic optimal operation strategy,though the economy & response time optimization strategy increases the operating cost by 6.3%,the amount of interrupted load and total energy recovery time can be reduced by 23.3% and 10.4%,respectively.