Research On Static Security Region Of Electricity-Gas Coupling System With Wind Farm

With the advancement of energy interconnection and the uncertain large-scale access of wind power,the coupling of electricity-gas multi-energy flow system is becoming increasingly close together and stochastic.The study of the statie safety stability domain of the electricity-gas coupling system considering the uncertainty of the fan output is a safe and stable operation field of the multi-energy flow system,which can provide safe operation information for the multi-energy flow system and safe operation of the electricity-gas coupling system.It is important to improve the utilization of the system.For this reason,the main research of this paper is as follows:Firstly,It is directed to do research in the problem of probabilistic load margin of electricity-gas coupling system of wind farm.It is presents a probabilistic mixed continuous power flow model with wind farm electricity-gas coupling system considering the dynamic characteristics of natural gas pipeline network.The solution is solved by using the stochastic response surface method(SRSM)and the continuous power flow hybrid algorithm.The model and algorithm simulation test is carried out by using the IEEE 14 node system,natural gas 22-node system and 11 energy hub(EH)electricity-gas eoupling systems.The results show that the probabilistic continuous power flow model of the electricity-gas coupling system considering the dynaruic characteristics of the natural gas pipeline network is more in line with the actual situation of the multi-energy flow system.The proposed method ean effectively solve the maximum load margin and is the static safety stability domain of the electricity-gas coupling system.The research provides a theoretical basis for the method.Then,It is directed to do research in the problem of the maximum load margin and sensitivity analysis of the electricity-gas coupling system with wind farm.It is established that a paraoetric mixed continuous power flow model considering load growth direction in view of the second chapter probabilistic continuous power flow model;It is combined with predictive-correction and electricity-gas system coupling alternate iterative continuous power flow method to obtain power system load based on SRSM fitting fan output.It is defined the power system sensitivity,natural gas system sensitivity and electricity-gas coupling EH sensitivity.The simulation results verify that the sensitivity index of the model,algorithm and definition are correct and effective.The results can locate the weak link of the electricity-gas coupling system and quantitatively evaluate the EH coupling degree.Finally,It is directed to do research in the problem of static safety stability domain of electricity-gas coupling system with wind farm It is established that the static voltage/pressure safety and stability domain cutting plane model of the wind farm electricity-gas coupling system in view of the parametric mixed continuous power flow model considering the load growth direction.The static and electricity field electricity-gas coupling system statics with wind farm considering the load growth direction are constructed.The voltage/pressure safety and stability domain tangent plane fits the static safety domain approximation boundary of the electricity-gas coupling system.The simulation results show that the proposed model can effectively fit the static safety and stability domain tangent plane and its approximate boundary of the electricity-gas coupling system.In this paper,It is directed to do research the problem of the static voltage/pneumatic safety domain of the electricity-gas coupling flow system with wind farm,including the load margin,eoupling effect and safe operation of uncertain electricity-gas coupling system.It is provided the theoretical and methodological reference for the safe and stable operation and analysis of the energy flow system.