Research On Interval Security Region Of Regional Integrated Energy System Integrated With Renewable Energy Sources

At present,with the energy crisis and environmental pollution becoming more and more serious,the concepts of energy internet,integrated energy system,smart grid and so on have attracted extensive attention all over the world.Among them,due to the innovation of energy conversion equipments,the changes of life and production mode and the massive penetration of renewable energy sources,regional integrated energy system integrated with renewable energy sources(RIES-IRES)has become one of the important physical carriers of energy innovation.Through multi-energy complementation and mutual assistance,it can realize low-carbon,efficient and sustainable utilization of energy.However,the system also faces more serious security challenges with the increasing penetration of renewable energy sources.The impact of renewable energy uncertainty on existing regional integrated energy system security region model needs further investigating.The research on region observation from different dimensions and how to optimize the geometric features of the region as a whole is not sufficient.Therefore,based on the above background,this thesis studies the interval security region of RIES-IRES.The main work are as follows:(1)The concept and model of an interval security region of RIES-IRES based on interval mathematics analysis were proposed,and the imbalance between supply and demand caused by uncertainty of renewable energy sources was regarded as a special N-1 contingency.A security region unaffected by renewable energy uncertainty existed in interval security region,and the correctness of it was analyzed.Then considering engineering practice,a practical interval security region(RISR)model was established.(2)From the perspective of low dimension,based on the interval total supply capability model,a PISR dimension reduction observation method considering optimal selection of observation variables was constructed considering maximizing the practical security region unaffected by renewable energy uncertainty.From the perspective of full-dimension,a practical interval full-dimensional radius(PIFR)analytical model and a PIFR numerical mode were constructed,and then a PISR full-dimensional observation method based on the latter one was proposed.(3)Based on PIFR model,considering the balance of the region and the impact of renewable energy,the PISR geometric features quantitative analysis indexes and feature optimization cost index were constructed.Then a PISR geometric features multi-objective optimization method based on PIFR was proposed.(4)Combined with the simulation test,the system interval security region model,dimension reduction observation,full-dimensional observation and region geometric features optimization strategy were verified and analyzed.Three methods to increase the practical security region unaffected by renewable energy uncertainty were discussed.Two PIFR solution methods were compared.Finally,the effectiveness and accuracy of the interval security region models and methods proposed in this thesis were proved.