Trans-regional Robust Economic Dispatch Considering Wind Power Uncertainty Of Source System And Reserve Availability Of Receiver System

With the construction of UHV interconnected power grids,the large amount of wind power from the source system can be delivered through the tie-line,which can solve the wind power accommodation problem encountered by traditional single-region.In the traditional tie-line scheduling model,which aims to ensure safety and reduce the number of adjustments,the tie-line operates in an empirically-scheduled mode;breaking the traditional tie-line scheduling policy is the premise for trans-regional accommodation and reserve sharing,but existing research has shown that trans-regional dispatching research is still immature,and there is not enough understanding of the functional roles and coordination relationships among the source,tieline,and receiver in trans-regional dispatch.This results in trans-regional dispatch falling into a local optimum,which greatly hampers practical application of accommodating the large-scale wind power.Therefore,studying the related issues of trans-regional dispatch appears significant in the current energy trends in China.Aiming at the problem of wind curtailment caused by the limited capacity of single-regional accommodation in the traditional tie-line dispatching mode,this paper breaks through the traditional dispatching model,free-optimizes the way to give full play to the external delivery capacity of the tie-line,and establishes the trans-regional dispatch model considering tie-line delivery.The simulation is programmed to compare and verify the promotion effect of tie-line delivery on wind power consumption.The principle of tie-line delivery to promote trans-regional accommodation is analyzed in depth.Based on the research above,this paper addresses the inadequacies of existing tie-line delivery models in terms of tie-line constraints,functions and reserve,summarizes and refines current research status of existing literature,and comprehensively considers the roles of source system and receiver system in trans-regional dispatch.The new concept of cross-region dispatching is proposed,which includes "source-side requirements and receiver-side verification".The related assumptions,contents and characteristics of scheduling ideas are elaborated.Based on this scheduling idea,in order to solve the problem brought by the uncertainty of the wind,a robust economic dispatching model for wind power across regions is established considering the uncertainty of the source system and the reserve availability of receiver system,and the works out an integrated dispatch plan viewed “source-tie-line-receiver” as a whole.Firstly,the source system aims to model the problem of wind power accommodation,giving the tie-line the ability to delivery and reserve,and assist the source system to accommodate wind power.Then the tie-line is regarded as the uncertain power source for receiver system,and the availability of tie-line scheduling is verified under the constraints of receiver system.In order to verify the effectiveness of scheduling ideas and models,the traditional deterministic reserve configuration method is used in comparative examples to study the trans-region scheduling model under expected wind power scenario.Then,a robust dispatch model for reserve configuration is built in source system to deal with wind power uncertainty problem alone.For comparison,a robust reserve sharing strategy,which considers the availability of reserve in receiver system,is proposed to coordinate the regulation resources of the source and receiver systems to deal with the wind power uncertainty.The simulation results show that the robust economic dispatching and reserve configuration model are more reasonable and economical than the deterministic reserve configuration method.The flexibility of trans-regional economic dispatch considering reserve sharing can be improved by the cooperation of source and receiver systems.