Research On Distributed Energy Storage Aggregation Service Provider Participating In Grid Auxiliary Service Strategy

With the large-scale grid connection of new energy power generation,the intermittent and uncertainties of its output greatly increase the difficulty of grid operation,bring insufficient peak shaving and frequency modulation capacity and lack of standby resources to the auxiliary services of the power system.At the same time,it also inhibits the consumption of new energy.Therefore,the shortage of auxiliary service resources has become an urgent problem to be solved.On the other hand,the research and application of distributed energy storage technology has been highly valued.In recent years,due to the increasingly urgent demand for energy storage in power systems,its installed capacity has maintained rapid growth.With the advancement of energy storage technology and the evolution of power systems,the widespread application of distributed energy storage is an inevitable trend.Distributed energy storage has both source and load characteristics,can respond to grid dispatching requirements,and is a high-quality resource for providing auxiliary services.However,compared with the traditional operating mode of large power grids,it is geographically dispersed,with small individual capacity and poor controllability.It is difficult to be independently regulated and managed by the power system.At the same time,if a large number of distributed energy storage spontaneously and disorderly operation will endanger the safety and reliability of the power system.The use of aggregation management is an effective way to explore the potential value of fragmented resources and guide their operation.The establishment of advanced measurement system and energy management system provides technical feasibility for distributed management of distributed energy storage resources.The power market reform provides a good external environment for distributed energy storage resources to participate in auxiliary services,so it is necessary to manage distributed energy storage by aggregation,designing refined and personalized control modes to provide high-quality scheduling resources for auxiliary services in a market-oriented environment.This paper studies the distributed energy storage aggregation management to participate in the auxiliary services in the market environment.The main work content and research results are as follows:1.Combined with the development needs of auxiliary services and distributed energy storage,the concept of DSAP is proposed,and its participation in auxiliary services is designed as a whole.The definition,characteristics and advantages ofparticipating in auxiliary services are analyzed.The system architecture of DSAP is designed.The key technologies of DSAP participating in grid operation are analyzed.The control architecture,scheduling mode and operation mode of DSAP participating in the auxiliary service are studied.Among them,DSAP as the interactive platform system of power grid and users,proposes a centralized-distributed control architecture and a contract-based direct regulation mode.For the market-oriented auxiliary services,the operating mode of DSAP participation under two transaction modes is proposed.2.The optimization model and scheduling strategy of DSAP participating in peak shaving are proposed,under the two transaction modes of auxiliary service market reform.Based on the distributed storage energy storage scheduling characteristics,the schedulability potential can be analyzed through modeling.Under the bilateral contract transaction mode,a multi-objective scheduling model is proposed to optimize the decision-making multi-party participation behavior.Under the centralized bidding transaction mode,the pro-bidding and market clearing bid model is established,and scheduling model for real-time optimization of distributed energy storage output is also established.3.The feasibility and effectiveness of DSAP in peaking auxiliary service are verified by simulation examples.The influence of DSAP participation in peak shaving on power system operation,as well as the impact of DSAP aggregate capacity,objective function weighting factor and energy storage equipment loss cost on actual peak shaving scheduling are analyzed.