Research On Multi-Source Joint Scheduling Microgrid Of Combined Heat And Power System Considering Demand Response And Power Exchange

With the rapid development of new energy generation based on wind and power,the problem of wind and light abandonment caused by the incoordination of source and load is becoming more and more serious.As a new operation mode of power grid,micro grid provides a new way for local consumption of wind and power generation.With the introduction of relevant policies,environmental protection and economy have become an important requirement of the power industry,so the combined heat and power(CHP)micro grid has become a hot research direction.CHP micro grid includes all kinds of green energy power generation,heating system and energy storage devices,which can flexibly allocate energy to users,and have storage capacity for excess electric energy and heat energy,so as to cope with the instability of energy supply brought by the external environment,so that users have a better sense of experience for the demand of electricity and heat load.Considering the environmental cost,demand response and power interaction,this paper constructs a multi-source joint scheduling model of cogeneration micro grid,aiming to improve the wind power consumption and alleviate the environmental problems through the regulation of source load double ends and power interaction between micro grids.This paper first introduces the system structure and operation strategy of CHP microgrid,and then introduces its operation characteristics,including the operation characteristics and mechanism analysis of wind power,photovoltaic power generation,CHP units,energy storage devices,etc.,and then analyzes the mechanism of CHP microgrid considering demand response and power exchange.Then,aiming at the lowest comprehensive cost,a multi-source joint scheduling model with CHP microgrid is proposed based on the consideration of both environmental cost constraints and demand response constraints,aiming to improve the wind power consumption and reduce the emissions of SO2 and NOx.The model considers the operation cost of micro unit,environmental cost,operation and maintenance cost of wind power and photovoltaic power generation,operation cost of storage battery,cost of power exchange with large grid and relevant constraints of internal heat and electricity balance of micro grid,and uses CPLEX optimization software to solve the model.Finally,the feasibility and validity of the proposed model are verified by an example of a microgrid system.Finally,in order to further increase the consumption of wind and photovoltaic power generation and improve the economy of the scheduling model,the CHP type multi-source joint scheduling model considering demand response and power exchange between multiple microgrids is constructed on the premise of considering the comprehensive operation cost.The model considers the operation cost of the micro unit,the operation and maintenance cost of wind power and photovoltaic power generation,the operation cost of the battery,the cost of power exchange with the large grid,the cost of power exchange between the micro grids that can be allowed to exchange,and the constraints related to the internal heat and power balance of the micro grid.The simulation results show that the CHP type micro grid multi-source joint scheduling model considering demand response and power exchange is effective and feasible.Through the power exchange between multiple micro networks,the comprehensive operation cost can be effectively reduced.At the same time,it provides a reference for increasing the consumption of abandoned wind and photovoltaic power generation and promoting the development of wind power and photovoltaic power generation industry.