Cooperative Optimal Scheduling Of Distribution System With Multi-microgrids Considering Demand Response

In recent years,with the depletion of traditional fossil energy and the serious environmental pollution caused by combustion,it has become the focus of the world to actively explore new energy to replace traditional fossil energy.China has also set a strategic goal of reaching "carbon peak" by 2030 and "carbon neutrality" by 2060.Vigorously developing wind power,photovoltaic and other new energy,and building a new power system mainly powered by renewable energy plays a very important role in realizing the "dual carbon goal".However,after a large number of distributed new energy generation is connected to the distribution system,its intermittency and uncertainty will affect the operational economy and security of the distribution system.Because of its integration capability for distributed new energy power generation,microgrids have gradually attracted the wide attention of experts and scholars in various countries.Therefore,the study of optim al scheduling of distribution system incl uding micro-grids plays a crucial role in improving the penetration of renewable energy generation in the system and the system economy.At the same time,with the development of power distribution system and microgrid,multiple types of microgrids may be connected to the same distribution area.Therefore,it is of great practical significance to study cooperative optimal scheduling of multi-type microgrid distribution system to improve its overall operation economy.Based on this,the paper carried out the following research:Firstly,the research status of optimal scheduling and user-side demand response in microgrids is briefly analyzed.Taking typical microgrid types,namely industrial microgrids,residential microgrids and commercial microgrids as examples,the energy using characteristics of each type of microgrid were analyzed,and the equip ment contained in the microgrid was modeled.At the same time,the structural characteristics of distribution system with single microgrid and distribution system with multi-type microgrids are introduced,and the structural framework and model of di stribution system with single microgrid and distribution system with multi-type microgrid are constructed,which lays a foundation for the following work.Secondly,the optimal scheduling problem of distribution system with single microgrid is studied,and the day ahead-intra day optimal scheduling model of distribution system with single microgrid is con structed considering the response characteristics of the microgrid.Among them,in the day-ahead stage,the overall operation cost of the distribution syst em including a single microgrid is reduced by coordinating and optimizing the operating power of the internal devices of the microgrid and the interaction power of the distribution system and microgrid.The intra-day stage is to track day-ahead power interaction of linkage line of the distribution system and microgrid,and compensate the output fluctuation of new energy by ch anging the operating conditions of the internal equipment of the micro-network,so as to reduce the deviation between the actual power value of day-ahead planned value and day-ahead planned value,so as to reduce the influence of the uncertainty of photoelectricity output on the optimal scheduling and operation stability of the dis tribution system.At the same time,the effectiveness of the proposed day-ahead and intra-day optimal scheduling strategy for a distribution system with a single microgrid is ana lyzed and verified by using the IEEE33-node distribution system coupled with an industrial microgrid system as an example.Finally,aiming at the optimization scheduling problem of distribution system with multi-type microgrid,this paper proposes a distributed optimal scheduling strategy for distribution system with multi-type microgrid response characteristics.An optimal scheduling model of multi-type microgrid distribution system is established,aiming at the overall economic optimization.The distribut ed solution method based on rolling optimization is used to solve the above mo dels to protect the information privacy of each subject.At the same time,the couplin g between IEEE-33 node distribution system and industrial microgrid,residential microgrid a nd commercial microgrid is taken as an example to verify the effectiveness of the above optimization scheduling strategy in improving the overall operation economy of the system.