| In recent decades,extreme natural disasters such as typhoon frequently occur in cities,which threaten the reliable and stable operation of urban energy supply system and have a serious impact on the normal operation of economic society.Urban Integrated Energy Systems（UIES）is both an important form of energy used efficiently in the future and a key link for users.Its stable and reliable operation is of great significance to maintain people’s normal life as well as economic development.Therefore,under extreme natural disasters such as typhoon,UIES needs to have strong resilience to cope with different kinds of disturbances.This paper proposes a resilience improvement method under typhoon for urban distribution and natural gas networks based on soft open points（SOP）.SOP installed in distribution network with V/f control mode is applied to restore electrical loads in order to improve the load restoration ratio of the distribution system and provide voltage support for the loads on the fault side.After that,the load restoration ratio of the gas distribution system could also be improved because of the restoration of the coupling units.Optimal energy flow is applied in the proposed UIES resilience improvement model to determine the output of the power and gas sources,coupling units and also the loads to be restored.The resilience of UIES under extreme natural weather was improved by increasing the electrical and gas load restoration ratio of the system.The main contents are as follows:1)Urban distribution and natural gas networks models are established respectively.Gas turbine and electric-driven compressor are taken as coupling units of UIES.This part provides a theoretical model foundation for subsequent analysis.2)Typhoon wind speed model is used to calculate the line fault rates in distribution network,this part analyzes the results and also proposes the fault analysis method of the natural gas network caused by the typhoon.The fault rate of each line under typhoon is analyzed and the correctness and effectiveness of the typhoon wind speed model is verified with test system IEEE33.Through the typhoon wind speed model,the branch with highest fault rate is selected as the weak link of the system for subsequent analysis,and the fault location was determined in advance for effective resilience improvement in typhoon weather.3)Analyze the topological structure and control strategy of SOP.SOP with V/f control mode is applied in distribution network to provide voltage support for the bus on the fault side and restore electrical loads.The effect of SOP on electrical load restoration of distribution network and the factors influencing the restoration effect are verified with test system IEEE33.4)Propose the resilience improvement method of UIES based on SOP.Through the application of SOP device,the load restoration ratio of the distribution network can be improved and then the load restoration ratio of the gas network can also be improved.Optimal energy flow is applied to determine the output of power and gas sources,coupling units and the loads to be restored.The correctness and effectiveness of the proposed method are verified with test systems IES E33-G14 and IES E123-G48. |
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