Research On Configuration And Scheduling Strategy Of Multi-energy Complementary Integrated Energy System Based On Source-load-storage Coordination

The growing severity of human production and lifestyle consequences is due to the influence of global climate change,which is triggered by carbon dioxide emissions.Renewable energy,as the pillar to achieve the goal of net zero emission energy transformation,has become an inevitable trend to replace tradit ional fossil energy.The comprehensive energy system offers benefits such as diversified energy supplementation,efficient amalgamation,adaptability,and steadiness,along with low carbon emissions and eco-friendly measures.As it caters to the diverse energy requirements of consumers,this approach can judiciously allocate resources on the supply side,efficiently integrate renewable energy sources,and establish a modern energy system that maintains a dynamic equilibrium between generation,demand,and storage.A comprehensive energy system with multiple complementary capabilities includes multiple equipment and devices,with high structural complexity.These devices are interdependent and work together,and if improperly configured,they can easily lead to problems such as reduced system efficiency,energy and load imbalances,and energy consumption.This study focuses on typical buildings in Lanzhou City and constructs a comprehensive mathematical model for a multi-energy complementary system based on source-load-storage synergy,considering the full range of working conditions.Taking into account China’s"dual carbon"policy and time-of-use electricity pricing,the research investigates system operation strategies,capacity distribution,and yearly operational features.A multi-attribute evaluation index is employed for a systematic regional analysis of four cities located in distinct climatic zones.The main research work of this paper is as follows:（1）The typical commercial and residential buildings in L anzhou New Area were selected as the research object.Utilizing the load calculation software De ST,we simulated the building’s hourly cooling,heating,and electrical loads throughout the year,based on the structural parameters of the building envelope a nd environmental climate features.Additionally,the yearly hourly domestic hot water loads were calculated by considering the water temperature,user consumption,and usage habits.（2）Considering the load characteristics of typical commercial and residential buildings in Lanzhou,along with regional climate,environmental conditions,user energy consumption patterns,and local renewable energy availability,the aim is to satisfy users’multi-level energy demands for cooling,heating,and electricity.Advanced technologies such as solar photovoltaic power generation,air source heat pumps,ground source heat pumps,and energy storage are integrated,accounting for constraints on material,energy,and data flows.A simulation model for a comprehensive,multi-energy complementary energy system based on source-load-storage coordination（SLS-CES）is developed using Visual Studio C++software.The system operation strategy is established under the time-of-use electricity pricing policy,taking into account the grid’s peak-valley average electricity price and solar photovoltaic power generation characteristics.（3）Based on the results,a configuration comprising 4800 photovoltaic panels（with a peak power of 415W）,458 sets of 3Ah energy storage batteries,8 sets of 13.6k W jet enthalpy-increasing air source heat pumps,2 sets of ground source heat pump units（rated power of 8.5k W）,5 heat accumulators（with a volume of 10m³）,and 5 sets of gas-fired boilers（with a rated heat output of 166k W）was found to be the best suite d to meet the typical building load in Lanzhou.The performance of the integrated energy system in the Lanzhou area was analyzed and compared with the traditional grid power supply and cogeneration centralized heating system,considering thermal,environmental,and economic factors.The results showed that the annual average primary energy utilization rate of the integrated energy system increased by 29.04%compared to the decentralized system,leading to a reduction of 1905.19t of CO ₂emissions and a CO₂ emission reduction rate of 41.62%.The thermal and environmental benefits of the integrated energy system were found to be superior to the distributed supply system,both on a typical daily and annual basis.However,the primary energy saving rate and CO₂ emission reduction rate during the typical daily flat valley electricity price period were relatively small due to the addition of energy storage batteries.The annual net income of the comprehensive energy system is415,900 yuan,and the static investment payback period is 12.09 years.（4）The systematic regional analysis was conducted in four typical cities,namely Lanzhou,Hohhot,Guangzhou,and Nanjing.The results indicate that a multi-energy complementary integrated energy system,which is based on sourc e-load-storage coordination and operated under different capacity configurations and time-of-use pricing policies,can fulfill the energy demands of users while reducing peak and filling valley loads.This approach results in significant economic benefits and helps to alleviate peak power supply pressure on the grid.Hohhot exhibited the best environmental and economic performance,while Guangdong had the highest primary energy saving rate.The thermal and environmental benefits of the system can be greatly improved by configuring the photovoltaic panels and the number of heat pumps reasonably.Within an acceptable initial investment range,increasing the battery capacity can effectively enhance the economic performance of the system.