Research And Application Of Regional Integrated Energy System Optimization Scheduling Based On Multi-energy Complementarity

With the deepening of people’s yearning for a better life,the service functions in the region will be accelerated and upgraded,and the energy market has huge potential.Regional integrated energy system as the main load-bearing form of future energy system,the framework of the system structure,equipment composition,load forecasting and optimal operation research is one of the methods of comprehensive energy systems,energy efficiency,to promote energy structure transformation,the establishment of a new renewable energy based energy system is of great significance.Firstly,the basic framework of regional integrated energy system is proposed,and the characteristics of energy flow conversion and energy complementary substitution of various energy sources in the region are analyzed.Further,taking hospital as the regional integrated energy system application object,in view of the system of energy production and conversion equipment to establish mathematical model,mainly including cogeneration unit and gas boiler,electric refrigeration and air conditioning units,photovoltaic power generation equipment,solar water heating system and the power model of the heat storage device,for subsequent integrated energy system optimization scheduling model is established to lay the theoretical foundation.Then,the operation optimization strategy of regional integrated energy system is put forward.The BP neural network model is constructed,and the short-term electricity,heat and cooling load and the output of renewable energy equipment are predicted.Furthermore,the optimal scheduling model of hospital integrated energy system was established based on the daily economic cost that the hospital decision makers paid the most attention to.The scheduling objective mainly considers the cost of online electricity and gas purchase of superior energy,the operation and maintenance cost of energy production and conversion equipment in the system,and the pollution emission rectification cost.Based on the mathematical simulation platform of MATLAB,linear programming software CPLEX is used to solve the problem.Finally,taking Hangzhou Dingqiao Hospital as an example,day-ahead optimization scheduling is studied based on the regional integrated energy system model established in this paper.The whole year is divided into three different quarters,and the scheduling is optimized on the basis of the typical report of different quarters of the hospital,the forecast of heat and cooling load,and the output forecast of photovoltaic power generation equipment.The simulation results show that: 1)Compared with the original energy supply scenario where each energy subsystem is independent of each other,the multi-energy complementary mode can save 21.9% of electricity purchase cost and 32.7% of gas purchase cost under the typical daily load condition in the transition season;Although the equipment involved in energy supply increases in this mode,it can still achieve the purpose of saving operation and maintenance costs on the premise of meeting the energy demand of the hospital.2)On typical days in summer,hospitals should be more inclined to use renewable energy and waste heat resources.In the mode of multi-energy complementarity,15.5% of electricity purchase cost and 14.6% of gas purchase cost can be reduced.3)In typical days of winter,the heating load demand of the hospital is high while the cooling load demand is small.The use of air-cooled heat pump unit for auxiliary heating effectively reduces the cost of purchasing gas by 29.1%,and saves 29.9% of the equipment operation and maintenance cost of the hospital while avoiding the high load operation of the gas boiler.4)The total daily energy cost of the hospital can be reduced by 24.29%,15.31%and 23% respectively under the premise of meeting the daily energy demand of typical load in the transition season,summer and winter through the output scheduling of energy production and conversion equipment in the comprehensive energy system of the hospital,thus achieving economic optimization.5)Considering the access of renewable energy,the multi-energy complementary mode improves the energy efficiency management level of the hospital and reduces pollutant emissions by optimizing the operation and scheduling of energy production and conversion equipment and energy storage unit in the comprehensive energy system.