| The proposal of the " carbon peaking and carbon neutrality" goal has promoted the large-scale application of renewable energy in the integrated energy system.The rise of new energy has injected new impetus into the transformation of China’s energy structure.However,the intermittence and volatility of renewable energy affect the stability of the energy system and cause the imbalance between energy input and user demand.The application of energy storage technology is an effective means to solve this problem,The access of single type energy storage equipment limits the improvement of system performance,and multi-energy storage configurations are gradually emerging and applied.The main research contents are as follows:Firstly,this paper builds a regional integrated energy system architecture considering the energy supply network,establishes the energy flow model between nodes within the distribution network and district heat network and the output model of each equipment in the system according to the energy flow and conversion relationship,and analyzes and models the important factors affecting the output of the equipment..Secondly,the multi-energy storage siting and capacity setting problem is explored,and the establishment method of the multivariate energy storage configuration optimization model is introduced in detail through four parts: decision variables,constraints,objective function,and solution method,and the effectiveness of the model is verified by arithmetic examples.The results show that the configuration of multi-energy storage has superiority compared with single type of energy storage,which effectively improves the economy of the energy system and reduces the comprehensive system cost by 24.57%.In addition,the multi-energy storage technology utilizes time-of-use tariff for arbitrage,and the system almost does not need to purchase power from the grid during the peak tariff period,while increasing the consumption of renewable energy,increasing the utilization rate of wind power by 14.97% and reducing the cost of power purchase from the grid by 64.34%.Finally,considering that load demand can be influenced by multiple factors with uncertainty,which can have an impact on the multi-energy system configuration and the overall energy system revenue.Using the method of opportunity constrained planning to model customer load uncertainty,we study the change of multi-energy storage configuration and overall system performance under different system reliability,and the results show that when the system reliability is increased from 0.5 to 0.99,the optimal planning position of multi-energy storage remains unchanged,the capacity configuration is changed,and the system’s energy storage investment and operation cost,grid power purchase cost and network loss cost are increasing,making the comprehensive cost increased by 22.34%. |
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