Research On Optimal Operation For Power-heat Integrated Energy System Considering Wind Power Utilization

The dual pressures of energy shortage and environmental pollution are forcing people to find more efficient ways to use energy and increase the utilization of renewable energy.Compared with other systems,the power-heat integrated energy system with wind power achieves the cascade and efficient utilization of energy with the advantages of more efficient utilization,less pollution emissions and lower operating costs.The power-heat integrated energy system with wind power operates according to the heat led mode,severely restricted the ability of integrating wind power,resulting in high percentage of wind curtailment.Therefore,in order to minimizing the curtailment of wind power and operating cost,the peaking shaving ability of the system is fully excavated from the supply side and demand side.The research content has the following parts:At first,this thesis expounds the development situation about power-heat integrated energy system,and a summary about the academic research in the wind power integration solution in power-heat energy system at home and abroad is made.Secondly,the superstructure of power-heat integrated energy system is analyzed,and the cascade utilization of heat in the process of energy conversion is summarized.Then,the mathematical model of energy flow and corresponding elements are established.Thirdly,electrical boiler and heat accumulator is introduced to decouple the link between heat and power,and better synergize with wind power.Aiming at minimizing the curtailment of wind power and operating cost,an optimal operation model of power-heat integrated energy system with electrical boiler and heat accumulator is constructed from the supply side.The model considers the constraints of electric and thermal power balance,power flow and operation of each corresponding element.A case study for a 6-bus system shows effectiveness to deploy electrical boiler and heat accumulator with wind power in different operating modes.Finally,this thesis proposes an optimal operation model for power-heat integrated energy system combining the thermal inertia of a district heating network and buildings to enhance the absorption of wind power.The model fully utilizes the thermal inertia of buildings during operation to achieve the coordinated interaction between wind power and load.The validity of the model is verified by a case study for 6-bus system.