计及节点分裂的源网协同优化决策

Synergistic Optimization Decision-making of Source and Network Considering Bus Splitting

伴随大规模可再生能源发电并网,以及各类主动负荷的融入,在经济调度中进行源和网的协同优化已十分必要。为避免现有研究仅通过调整支路运行状态改变电网结构的不足,本文提出了计及点分裂的源网协同优化模型。首先对电网结构与经济调度间的关联机理进行深入分析,论证了通过点分裂方式改变电网结构的必要性。在此基础上,通过引入虚拟注入和虚拟支路的方式表示点分裂过程,并给出了点分裂过程在经济调度中的约束表达。基于直流潮流模型,建立了计及点分裂的源网协同优化模型,并给出了进一步考虑节点短路电流容量限制、电网连通性等复杂约束的启发式求解流程。最后,通过5节点系统验证了本文模型的有效性。

Along with the integration of power generated by large-scale renewable energies and various active loads,it is necessary to implement synergistic optimization of source and network in economic dispatching.To avoid the insuffi.ciency of the existing research in which the power grid structure is only changed by adjusting the operation states of branches,a synergistic optimization model of source and network considering bus splitting is proposed in this paper.First,the relationship between power gird structure and economic dispatching is analyzed,and the necessity of chang.ing the power grid structure using bus splitting is demonstrated.On this basis,the process of bus splitting is represented by introducing virtual injection and virtual branches,and the constraint representation of bus splitting in economic dis.patching is given.Based on a direct current(DC)power flow model,the new model is built,and a heuristic solving pro.cess is given considering the complex constraints such as bus short-circuit current capacity limit and the connectivity of power grid.At last,the feasibility of the proposed model is verified by a 5-bus power system.