Multi-time Scale Dispatch Of Cspp System Considering The Peak Shaving Flexibility Of Hvdc Tie Line

New energy represented by wind power and photovoltaics,has played an important role in helping to achieve the "carbon peaking and carbon neutrality goals" and promoting my country’s energy transformation.However,due to the strong fluctuation of new energy output,the limited peak shaving capacity of cogeneration units,and the insufficient utilization of the peak shaving potential of the high voltage direct current（HVDC）tie line,the northwest region with abundant wind and solar resources has the severe problem of new energy curtailment during the winter heating period.Secondly,since the output of new energy has the characteristics of "the closer to the forecast point,the smaller the forecast time scale and the smaller the forecast error",and the system lacks fast-response peak shaving resources,which puts forward higher requirements for new energy consumption under the large-scale new energy grid connection in the northwest region.Insufficient peak shaving capacity on the source side and limited peak shaving capacity of the grid-side HVDC tie line are all important reasons for restricting the consumption of new energy in the northwest region.Relying on the cost-effective large-scale thermal energy storage,the concentrating solar power plant（CSPP）can not only be used as a hub for electric energy and thermal energy to realize the coordinated operation of electric and thermal coupling,but also can realize minute-level refined control of electric and thermal output through dynamic models,and improve the system adjustment ability.At the same time,the grid dispatching center can control the trigger pulse of the converter to realize the flexible adjustment of the transmission power of HVDC tie line,and it can also be used as a peak shaving resource to improve the flexibility of the system operation.Under this background,it is a project with research value to coordinate the output of various peak shaving resources in multiple time scales of the HVDC transmission system with CSPP,to promote the consumption of new energy during the heating period in the northwest region and to improve the economy of system operation.This paper first studies the structure and operation principle of the CSPP,analyzes the functions of each module of the CSPP,and analyzes the operation mechanism of the multi-source combined system with the CSPP as the core;As an optimizable resource,HVDC tie line transmission power can achieve its peak shaving flexibility under the premise of satisfying various operating constraints;The principle of coordination between HVDC tie lines and multi-source combined systems to promote new energy consumption and reduce system operating costs is studied,and the day-ahead and intra-day operating characteristics of various peak shaving resources of the system are analyzed to provide theoretical support for multi-time-scale coordinated dispatching.According to the peak shaving flexibility coupling mechanism of the coordination between the HVDC tie line and the CSPP,this paper constructs a dispatching model for the heating period of the CSPP that considers the peak shaving flexibility of the HVDC tie line.The model aims at the lowest comprehensive operating cost and introduces fuzzy chance constraints to deal with the uncertainty of intermittent power and load.The simulation results show that the complementary advantages of the source side and the grid-side can make up for the limitations of each other’s peak regulation and improve the level of wind and solar energy consumption in the system.In order to deeply explore the potential of various peak shaving resources in the system,this paper combines the characteristics of different response speeds of various peak shaving resources in the system,and makes use of the characteristics of new energy output and load demand prediction accuracy that gradually improve day-ahead to intra-day,through multiple time scales scheduling the dispatching plan which is formulated in detail and constructing the multi-time-scale coordinated scheduling model of the HVDC transmission system of the CSPP.The simulation results show that the model can realize the coordinated dispatching of various peak-shaving resources within the system,and play the advantages of fast-response peak-shaving resources through multi-time-scale dispatching,which can further promote new energy consumption of the power system with a high proportion of new energy and improve the system operating economy.