| Due to the exhaustion of traditional fossil energy sources,the global energy supply and demand relationship has become increasingly tense,and the integrated energy system constructed by coupling multiple energy networks is emerging.The advantage of the integrated energy system is that it can promote the mutual conversion between different energy sources and complement each other,thereby improving the utilization rate of the terminal energy,but at the same time it also makes the risk faced increase sharply.In particular,the faults of different energy networks can be propagated and spread with each other through the coupling equipment,thereby aggravating the seriousness of the consequences.Therefore,this paper mainly studies the reliability evaluation of the integrated energy system based on the coupling equipment failure.The details are as follows:(1)A brief introduction to the development overview and research status of the integrated energy system reliability assessment,and by analyzing the characteristics of the subsystems and components of the integrated energy system,the power system model,natural gas network model,thermal system model and various coupling equipment models.In addition,based on the modeling of the integrated energy system,a unified solution method is used to calculate the multi-energy flow of the integrated energy system.Modeling and multi-energy flow calculation mainly lay a solid foundation for the reliability assessment of integrated energy systems.(2)According to the possibility of failure in the operation of the integrated energy system and the impact on the entire system during the failure,the reliability evaluation index of the integrated energy system is proposed.The reliability evaluation index includes the possibility of operating risk of the system and the impact on the system when the fault occurs,which is used to quantitatively describe the reliability of the operation of the integrated energy system.(3)Considering the different operation modes of the integrated energy system,namely the normal operation state and the maintenance operation state,analyzed the energy supply situation of the integrated energy system under the "N-1 criterion" and"N-2 criterion",and proposed a reliability evaluation method of the integrated energy system of electricity,natural gas and heat coupling based on the coupling element failure.This method takes into account the different modes of the integrated energy system during steady-state operation,and describes whether the power,natural gas,and heat supply are sufficient when the equipment fails happening.(4)According to the reliability evaluation index of the integrated energy system,find the weak links of the entire system,and strengthen the weak links to improve the reliability of the system.At the same time,it also provides effective data reference for dispatchers of the integrated energy system,which is convenient for formulating related measures and plans in advance to deal with emergency emergencies.Finally,this paper simulates the integrated energy system by an example,and the results of this example prove the effectiveness and practicability of the proposed method. |
