Research On Reliability Assessment Method Of Electrical-gas Interconnection System

Building China's energy Internet and accelerating the promotion of "clean substitution,electricity substitution and energy interconnection" are the fundamental ways to achieve carbon peak and carbon neutrality in China.The integrated energy system is a new energy supply system that takes electricity as the center,organically coordinates and optimizes the distribution,transformation,storage,consumption and other links of all kinds of energy,and makes full use of renewable energy.The more common integrated energy system is the power-gas interconnection system.With the more and more extensive application of the power-gas interconnection system,the requirements for safety and reliability are also higher and higher.It is of great significance to study the reliability evaluation of the power-gas interconnection system.In this paper,the gas network is regarded as the gas source in the ideal state,and the mathematical model of the power-gas interconnection system with key components such as P2 G device,gas turbine set and distributed power supply is established.The mixed integer second-order cone programming method is used to carry out the research on optimal energy flow calculation,fault reconstruction and reliability evaluation methods.The specific work contents are as follows:1 A hybrid integer second-order cone programming method is proposed to calculate the optimal energy flow of the power-gas interconnection system.From the perspective that DG wind-solar output,gas load of gas generator set and capacity of P2 G device affect system operation,combined with mathematical models of key components,an optimal energy flow model of the power-gas interconnection system was built.The mixed integer second-order cone programming method was used to solve the model.The correctness and effectiveness of the model and the solution method are verified by an IEEE33 node system design example.2 A hybrid integer second-order cone programming based fault reconstruction method for power-gas interconnection system is proposed.Against traditional distribution network to solve the fault reconstruction problem of efficiency is not high,and to establish the minimum loss of electricity load as the target of electricity,gas interconnected system distribution network fault reconstruction model,using the method of mixed integer second-order cone programming implementation model,with IEEE33 node system design example,the correctness and validity of the model and solving method.3 The grid side reliability assessment of power-gas interconnection system based on sequential Monte Carlo simulation method is realized.Under the principle of N-1 static safe operation of the power-gas interconnection system,the reliability indexes were constructed from the perspectives of system level,equipment level and user level,based on the reliability models of load,distributed power supply,P2 G device and gas turbine,etc.Sequential Monte Carlo simulation method and fault reconstruction method based on mixed integer second-order cone programming are used to evaluate the grid side reliability of power-gas interconnection system.An IEEE33 node example with power-gas interconnection is used to verify the effectiveness of the indicators and methods proposed in this paper.