Study On Combined Heat And Power Operation Considering The Non-Uniform Characteristics Of Terminal Thermal Load

The gale period in the Three North Region coincides with the peak heating of period,and it is an irresistible trend to use wind power to clean the heat.However,while the wind power grid-connected capacity is increasing rapidly,the peaking capability of the power system is very limited,which makes a large number of wind powers become "abandoned winds" because they cannot be eliminated.Combined heat and power operation is not only a scheduling strategy for clean heating,but also a peak shaving method to promote wind power consumption.However,the existing scheduling strategy for combined heat and power operation is mainly for the control of “source” and “network”,and the research on “source-network-load” integrated control has not been deepened.In recent years,the potential peak-shaving capability and economic benefits of end users have gradually been valued by the academic community and explored by the industry.They are gradually participating in the optimal dispatching operation of the power system.However,most of the existing researches neglect the difference of heat load between individual users of the terminal,that is,the heat load of the terminal group users is regarded as uniform regulation.Neither fully considers the user's time and space differences,nor does it take into account the disturbances caused by repeated adjustments to the user,and thus does not fully exploit the peaking potential of the end user.Based on this,this paper proposes a “source-network-load” integrated control scheduling strategy that takes into account the individual differences in thermal load of the terminal to realize the combined heat and power operation of the thermal system and the power system.At the same time,based on the latest “green card” policy promulgated by the state,the policy adaptability and economic benefit of the scheduling strategy proposed in this paper are analyzed.The main work of this paper is as follows:(1)A mathematical model of the source unit of the “source-network-load” integrated control is analyzed.Firstly,the "uncontrollability" of wind turbine output is analyzed,and its output power model is obtained.Secondly,the "controllability" and "thermoelectric coupling" of thermoelectric combined unit output are analyzed,and the mathematical model of thermoelectric output is established.Finally,the source unit type that this paper mainly participates in regulation is determined.(2)Established a terminal user thermal load differential collection and analysis system for “source-network-load” integrated control.Firstly,the hardware system of the collection and analysis system of the difference of the individual user's heat load is established on the load side,and the data such as the user's electric load,heat load,heating room temperature and user outdoor temperature are collected;Secondly,the k-means algorithm is used to cluster the collected basic data,and the non-uniform characteristics of the thermal load of the terminal group users are studied and the corresponding mathematical models are established.Finally,based on the non-uniform characteristics of the thermal load of the terminal group users,four typical terminal thermal load spatial distribution scenarios of uniform,non-uniform near-end,non-uniform intermediate,and non-uniform remote are constructed and screened by scene analysis.It not only realizes the refined classification of users but also realizes the quantitative analysis of the difference of user heat load.(3)Proposed a scheduling strategy for combined heat and power operation of the “source-network-load” integrated control that takes into account the difference in thermal load of the terminal.Firstly,a pipe network with fixed hot water flow rate and temperature is added to the system,which connects the “source” and “load”,laying the foundation for the “source-network-load” integrated control.Secondly,taking into account the electricity” real-time "balance and thermal "delay" balance.Fnally,based on the non-uniform characteristics of the user's thermal load,the "source-network-load" integrated control thermoelectric joint operation model is established.At the same time,the GAMS software is used to simulate and optimize the four typical terminal thermal load spatial distribution scenarios.According to the analysis of the example,the new scheduling strategy proposed in this paper proves that the user's disturbance can be reduced and the peaking potential of the user can be more fully explored,and the wind power consumption can be promoted.The technical feasibility of the scheduling strategy proposed in this paper is proved.(4)Evaluated the adaptability of the proposed scheduling strategy to the latest green card policy and its economic efficiency.Firstly,it analyzes the relationship between the latest green card mandatory market transactions and electricity market transactions.Secondly,the calculation results of the example 3 are evaluated from the perspectives of wind power consumption,system benefits and quota completion.It is verified that the scheduling strategy proposed in this paper can not only adapt to national policies but also improve the economic benefits of the system.It has important engineering applications.Value contributes to the promotion and implementation of the latest green card policy.