Optimal Operation Of Regional Integrated Energy System With Adjustable Heat Electricity Ratio

In recent years,the regional integrated energy system with the core feature of renewable energy generation technology has developed rapidly.However,in China’s"Three North" and other regions rich in renewable energy,there are many problems,such as limited export capacity and excessive power generation and insufficient local absorption capacity caused by the traditional cogeneration system "determin power by heat" mode,which often lead to a large number of wind and light abandonment phenomena,and the energy utilization efficiency is difficult to improve.How to adjust the heat electricity ratio of the system has become a problem that has to be solved on the road of renewable energy development.In addition,the integrated energy system is a complex system with multiple time scales and energy needs.How to achieve the optimal operation of the integrated energy system according to the complementary coupling characteristics of different energy sources is an important research direction of the future energy system development.In view of the above problems,this paper has carried out the following research work from the aspect of the optimal operation of the regional integrated energy system with adjustable heat electricity ratio.In this paper,the mechanism of regulation of heat electricity ratio by using heat storage in cogeneration system and heat recovery steam generator(HRSG)with supplementary combustion are studied deeply,and the optimal operation model of regional integrated energy system under the two modes is established.The advantages and disadvantages of the two modes are compared from four aspects of economy,energy utilization efficiency,carbon emission level and heat electricity ratio flexibility.The results show that the supplementary combustion mode performs better in economy and energy efficiency.The heat storage mode has more advantages in carbon emission level and heat electricity ratio flexibility.The two modes with adjustable heat electricity ratio are better than the fixed mode in four aspects.In order to further improve the flexibility of the system,this paper proposes a dynamic electricity demand side response mode,which considers the load forecast value,studies the function of this mode to smooth the load curve,and verifies that the optimized operation results of the regional integrated energy system with dynamic electricity demand side response are better than those without considering the demand side response in terms of cost and energy efficiency under the two modes of heat storage and supplementary combustion.In addition to adjusting the heat electricity ratio,the electric energy storage and conversion equipment equipped in time can also better place the spilled electric energy,absorb the renewable energy,and improve economy and overall energy efficiency of the system.This paper studies the optimal operation of the regional integrated energy system under the three modes of electric energy storage and conversion,including electricity storage,power to gas,and electric heat pump.The results show that adding electric heat pump to the regional integrated energy system can obtain the lowest operation cost and the highest operation efficiency,but also cause the largest carbon emissions.In terms of operation cost and energy efficiency,all models that equipped with power storage and conversion devices are superior to the basic models.Finally,this paper establishes a multi-region integrated energy system optimization operation model with different user types,and uses the centralized algorithm and the alternating direction multiplier method(ADMM)to solve the model,and the results are basically the same,which verifies the accuracy of the model.