Combined Heat And Power Multi-time Scale Scheduling Strategy For Wind Power Consumption And Application

The electric-thermal control relationship of the heating unit and the “heat-fixing” mode have significantly reduced the peak-shaving capability,which has led to a serious problem of wind abandonment in the ‘Three North’ area of China.At the same time,the urban central heating system has a strong heat storage capacity,which can realize thermal electrolysis and improve the level of wind power consumption.With the support of the National Science and Technology Support Program,this paper takes the large-scale wind power access combined heat and power system as the research object,and proposes to fully exploit the heat storage characteristics of the central heating system.Under the premise of ensuring the heating quality,this paper breaks the heat-fixing electrical rigid constraint,the realization of thermal electrolysis coupling to promote wind power consumption;a systematic study of heating system model construction and characteristic analysis,combined heat and power multi-time scale scheduling strategy and application.The main work of the thesis are as follows:(1)Study on the simplified model of heating system and its heat storage characteristics for combined heat and power scheduling.The basic principles of heating unit,heating pipe network and heating users are analyzed.The heat source of the heating unit,the thermal delay and heat loss characteristics of the heating pipe network,and the thermal inertia of the building are considered.thermal source model,thermal network model,thermal user model,and source-network-charged energy transfer model are built.Based on the model,the heat storage characteristics of the heating system are qualitatively analyzed through simulation experiments and field experiments,and the applicability of the optimization of the combined heat and power system is verified.(2)Study on combined heat and power multi-time scale scheduling strategy based on time series.Considering the heat balance characteristics of the heating system at different time scales,a combined heat and power multi-time scale scheduling model based on time series is constructed.In the pre-week stage of the long-term scale,a combined heat and power unit commitment model considering the total heat supply balance is established.In the day-ahead stage of the 24-hour scale,a combined heat and power day-ahead scheduling model considering the dynamic heat balance is established.In the intra-day rolling stage of the 4-hour scale,a combined heat and power rolling scheduling model considering the dynamic thermal balance is established.In the real-time stage of the 15-minute scale,a combined heat and power real-time scheduling model considering static thermal calibration is established.The simulation results of the actual system show that the combined heat and power multi-time scale scheduling model constructed in this paper can consumptive wind power step by step,which can significantly improve the adjusting ability of the system.(3)Study on the application and verification of combined heat and power multi-time scale scheduling strategies.Based on the combined heat and power multi-time scale scheduling model and method,the unit combination,daily dispatch and intraday dispatch are applied to the actual power system and thermal system in Jilin Province in northeast China respectively.The typical operation mode and the running data of the typical operation day indicate that: The combined heat and power multi-time scale scheduling strategy proposed in this paper can correct the scheduling plan step by step,and consume more wind power on the premise of satisfying the heating.