Research On Distributed Online Economic Dispatch Based On Automatic Generation Control

Economic dispatch has attracted long-term attention from researchers for its ability to re-duce the total fuel consumption for power generation.With the expansion of the scale of the power system,the traditional centralized economic dispatch requires more computing costs and communication resources.By contrast,distributed control only requires communication be-tween adjacent nodes,can prevent single points of failure,and has good scalability.It has become a research hotspot in the field of economic dispatch in recent years.However,offline distributed optimization algorithms cannot adapt to the development trend of the modern smart grid.Therefore,in the context of the intelligent operation of the power grid,this thesis pro-poses a One-less economic dispatch strategy for the economic dispatch problem,which runs online and effectively reduces the cost of power generation.The main work of this thesis is summarized as follows:1.Distributed One-less Economic Dispatch Algorithm for Single-area Power GridThis thesis proposes a distributed One-less economic dispatch algorithm for single-area power grids based on the current automatic power generation control structure.Without calculating the supply-demand mismatch collectively,we feedback only the local infor-mation of the generator in automatic generation control into the algorithm.The slack bus participates in the calculation process of economic dispatch without executing scheduling instructions,while other generator nodes regulate their output power using an incremental cost consensus algorithm.The algorithm will not break the power balance,thus it can be used online.Theoretical analysis shows that the algorithm can converge to the optimal solution of economic dispatch problems.2.Distributed One-less Economic Dispatch Algorithm for Multi-area Power GridsGiven the current situation of the multi-area interconnected power system,this thesis fur-ther studies the multi-area economic dispatch problem.Based on the single-area One-less economic dispatch algorithm,we propose a fully distributed One-less economic dispatch algorithm suitable for the multi-area power grid.This algorithm uses the slack bus in-formation of adjacent areas to adjust the tie-line power,thereby minimizing the overall generation cost.Without modifying the existing automatic power generation control,this algorithm is convenient for practical use.This algorithm will not break the power balance constraints during the iteration,thus it can be used online.