Research On Multi-area Combined Heat And Power Coordinated Operation Considering The Heat Storage Of Buildings

China's north region is rich in wind energy resources.With the vigorous promotion of the country,China's wind power develops rapidly.The newly installed capacity and accumulative installed capacity of wind power rank first in the world in recent years.However,due to the limited peak regulation capacity of the power grid,there has been a serious problem of wind abandonment in the north area of China for a long time.From the point of view of combined operation of electricity and heat,if we can fully tap and utilize the heat storage capacity of existing buildings and carry out multi-regional coordination of electricity and heat,we can provide more access space for wind power,which is of great significance to enhance the flexibility of system operation and promote wind power absorption.In this paper,the coordinated operation of multi-area electro-thermal system considering the thermal storage characteristics of buildings is studied.Firstly,the thermal dynamic characteristics of building,which has good thermal storage capacity and does not require additional investment,are modeled,and the simulation model is built to simulate and analyze the main factors affecting the change of building room temperature.Then,starting from the characteristics of thermodynamic system balancing and power system having wide-area coordination,resource distribution difference among regions and time-space correlation of wind power,the basic idea of multi-area combined heat and power coordination considering thermal storage characteristics of buildings is elaborated,and thermal operation constraints such as thermal dynamic characteristics of buildings are listed as constraints together with power operation constraints such as tie-line operation constraints.Aiming at minimizing the operation cost of the combined system,a multi-area combined heat and power coordinated operation model considering the thermal storage characteristics of buildings is established.Finally,an example is given to verify the validity of the model.The results show that different wind power installed capacity has different ability to participate in multi-regional electric and thermal coordination.When a region can absorb all wind power without fully utilizing its own building's thermal storage capacity,the region has the ability to participate in multi-regional electric and thermal coordination.Considering the temporal and spatial correlation of wind power,the region has multi-regional wind power when the relative difference of wind power in each region is large.Coordination of electricity and heat can make full use of the capacity of multi-regional buildings to achieve more wind power absorption.The above work can provide reference for utilizing building thermal storage characteristics to promote coordinated operation of multi-area electric heating system to further eliminate wind abandonment.