Research On Double Layer And Multi-objective Scheduling Method Of Regional Microgrid

Micro grid can accept renewable energy and improve the utilization rate of renewable energy,which develops rapidly in recent years.With a large number of micro grid connected to the superior distribution network,it brings great interference to the superior distribution network,which hinders the development of new energy and micro grid.Regional micro grid is a whole composed of several single micro grid,which can coordinate the complementary energy of each sub micro grid and reduce the pressure of the upper distribution network.The dispatching strategy of regional microgrid plays an important role in the complementary effect of energy advantages of regional microgrid.Multi-objective scheduling considers multiple scheduling objectives comprehensively,which makes the scheduling strategy more reasonable.The research on multi-objective scheduling of regional microgrid is of great significance to the development of new energy and microgrid.This thesis focuses on the multi-objective scheduling problem of regional microgrid,and studies the following contents:Firstly,the regional microgrid including three typical microgrids of supply,consumption and balance is analyzed.The output characteristics of the lower layer microgrid and its units are analyzed,and the corresponding models are given;Secondly,according to the principle of double-layer planning of regional microgrid,using the characteristics of energy only purchased from the absorption microgrid,energy only output from the supply microgrid and the balance microgrid that can purchase and sell electricity from the inside,the thesis determines that the upper layer of regional microgrid only needs to establish the cost scheduling model according to the power situation of the two microgrids and the power generation capacity of the balance microgrid,and at the same time considers the upper layer The influence of distribution network on the minimum fluctuation of tie line scheduling model.In the lower layer,the economic cost of stable operation after the microgrid absorbs the natural energy and the deviation target of scheduling plan issued by the regional microgrid are used to establish the regional microgrid bilevel multi-objective scheduling model.Finally,for the bilevel multi-objective scheduling model of regional microgrid,the particle swarm optimization algorithm based on the multi-objective model solving method is selected to solve.In the multi-objective particle swarm optimization algorithm,the Pareto dominated principle is used to find out the non inferior solution space,and the adaptive grid method is used to increase the diversity of understanding.In this thesis,a regional microgrid composed of three types of microgrids is used to verify the scheduling model.The results show that under the double-layer multi-objective scheduling strategy,the overall economic operation cost of the regional microgrid is the lowest,while the power fluctuation of the interconnection line of the distribution network is reduced.The balanced microgrid can be adjusted according to the scheduling power task of the regional microgrid to ensure the lowest operation cost of the microgrid and the minimum power fluctuation of the interconnection line of the regional microgrid,so as to achieve the double-layer optimal scheduling of the regional microgrid.This thesis studies the power coordination between the micro networks of the regional micro network,taking into account the interests of the upper and lower layers,to ensure the stability of the power,to solve the problem of large-scale micro network access to the upper distribution network and increase the power fluctuation of the tie line,and provides a new idea and method.