Research On Optimal Configuration Of Multi-energy Complementary District Energy Supply System

With the acceleration of China’s urbanization process and the improvement of people’s demand for quality of life,energy shortage and environmental pollution are becoming more and more serious,and have become the focus of social development.It is an important way to realize energy saving and emission reduction to adopt multienergy complementary regional energy supply system according to local conditions.It is necessary to conduct systematic research on the use of clean energy in the multienergy complementary distributed energy system,the optimal configuration of the system,and the efficient operation strategy.The multi-energy complementary district energy supply system studied in this paper is based on the triple supply system and rationally utilizes the renewable energy around the region.The paper correspondingly analyzes the energy supply equipment models including photovoltaic power generation,wind power generation,ground source heat pump,water source heat pump and other renewable energy sources.On this basis,from the perspective of energy planners,the evaluation methods of system economics and environmental pollution costs as main,auxiliary and energy utilization were determined,and the cooling and heating balance,power balance,installed capacity,equipment start and stop conditions,etc.Mathematical model with multiple constraints.Aiming at the model,the MATLAB procedure was used to complete the whole process from modeling to solving.This article also takes an actual energy planning project in Guizhou Province as an analysis case,selects suitable renewable energy sources from the city development plan,and selects De ST energy consumption simulation software to simulate the annual cooling and heating load of the building groups in the area.After substituting the load and various parameters into the optimization model,the optimal system configuration and operation scheduling strategy are calculated.The calculation results show that:compared with the traditional distribution system,the annual comprehensive cost is reduced by 5.27%,of which the annual operating cost is reduced by 12.18%,the environmental cost is reduced by 74.639%,the optimized system renewable energy utilization rate accounts for 31.451% of the total energy consumption The power supply ratio reached 90.587%.Although the initial investment increased,the incremental payback period was 6.11 years,accounting for only 40% of the total service life.This proves that the overall performance of the optimized system is better and has the meaning of energy saving and emission reduction.Based on the case project,this paper studies the impact of natural gas prices,power price fluctuations,and different grid interaction methods on the system.In general,when the system adopts the grid-connected and online mode,and the lower the gas price,the higher the electricity price,multi-energy complementary regional energy supply systems will have more comprehensive benefits..The content studied in this paper provides new ideas for solving similar multiple energy coupling problems,and provides relevant theoretical basis and technical solutions for similar energy planning engineering projects,which has certain reference value.